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角子山岩体地质矿化特征
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作者 郭帅 《西部资源》 2023年第5期13-16,共4页
前人已对角子山岩体的地质特征、年代学及地球化学进行了研究,基于总结、分析前人研究数据以及地表取样工作,本次将对角子山岩体的地质特征及矿化特征进行探讨。角子山岩体位于华北陆块南缘,形态近矩形,与围岩均呈侵入接触关系,形成于... 前人已对角子山岩体的地质特征、年代学及地球化学进行了研究,基于总结、分析前人研究数据以及地表取样工作,本次将对角子山岩体的地质特征及矿化特征进行探讨。角子山岩体位于华北陆块南缘,形态近矩形,与围岩均呈侵入接触关系,形成于燕山晚期,属A型花岗岩,分为6个单元。主体岩性为钾长石花岗岩类,仅第六单元为二长花岗岩;岩石富含SiO_(2)、K_(2)O、Na_(2)O,贫Al_(2)O_(3)、CaO、MgO、FeO、Fe_(2)O_(3),具铝富钾的特征,Nb含量较高,稀土元素含量低。岩体中发现有铌矿化体,规模不大。这些认识可以为下一步在角子山岩体以及其周围寻找原生铌矿和风化壳型铌矿提供参考。 展开更多
关键词 地质特征 类型 矿化特征 角子山岩
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红旗渠任村镇白家庄至尖庄段一带地质灾害体特征及其稳定性评价
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作者 尹红美 魏永齐 王培 《地下水》 2008年第6期108-110,144,共4页
红旗渠是举世文明的引水工程,全长4013.6 km。红旗渠沿线地质条件极为复杂,地质灾害频繁发生。林州市任村镇白家庄至尖庄一带为本次工作的勘查区,勘查中共发现零星崩塌3处,崩塌带1处、沟谷泥石流3处。本文针对发现的地质灾害的类型、规... 红旗渠是举世文明的引水工程,全长4013.6 km。红旗渠沿线地质条件极为复杂,地质灾害频繁发生。林州市任村镇白家庄至尖庄一带为本次工作的勘查区,勘查中共发现零星崩塌3处,崩塌带1处、沟谷泥石流3处。本文针对发现的地质灾害的类型、规模、形态等进行描述并给以稳定性评价。 展开更多
关键词 红旗渠 地质灾害特征 稳定性评价
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河北省张家口金矿集区同位素及包裹体地质特征 被引量:6
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作者 石来生 饶玉学 +1 位作者 宋瑞先 温建华 《矿产与地质》 2007年第3期219-227,共9页
张家口地区是我国重要的金矿集中区之一。自上世纪80年代以来,在崇礼县-赤城县毗邻地段的大型偏碱性二长岩杂岩体及其太古界中深变质岩系中,相继发现金矿田三个,探明金矿储量近100t。通过对该金矿集中区各类型矿床的大量同位素以及包裹... 张家口地区是我国重要的金矿集中区之一。自上世纪80年代以来,在崇礼县-赤城县毗邻地段的大型偏碱性二长岩杂岩体及其太古界中深变质岩系中,相继发现金矿田三个,探明金矿储量近100t。通过对该金矿集中区各类型矿床的大量同位素以及包裹体地质特征的研究,对该区金矿的成矿物质来源、矿床成因进行了探讨,这对于该区今后的金矿找矿工作具有实质性的指导意义。 展开更多
关键词 金矿集中区 成矿物质来源 同位素及包裹地质特征 张家口 河北
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山西省下泊水库坝址区岩体工程地质特征分析
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作者 高世丽 《中文科技期刊数据库(全文版)工程技术》 2022年第5期60-64,共5页
下泊水库坝基岩性为软硬相间的泥岩和砂岩互层组成。泥岩根据力学性质定义为软岩,其具有成岩作用差、抗风化能力低的特点,因此坝基地层物理力学性质的主要影响因素为泥岩。因此对坝基岩体工程地质特征的研究关系着坝址的选择以及坝型的... 下泊水库坝基岩性为软硬相间的泥岩和砂岩互层组成。泥岩根据力学性质定义为软岩,其具有成岩作用差、抗风化能力低的特点,因此坝基地层物理力学性质的主要影响因素为泥岩。因此对坝基岩体工程地质特征的研究关系着坝址的选择以及坝型的设计,本文即从岩石室内试验结果、岩体现场试验成果以及工程类比等方法综合得出岩体的物理力学参数,利用这些参数对坝基岩体和隧洞围岩进行工程地质分类,为设计提供可靠的地质参数。 展开更多
关键词 工程地质条件 工程地质特征 围岩分类
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大兴安岭地区地质体地球化学特征与铜矿化
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作者 夏冰 陈竟莲 李玉 《轻工设计》 2011年第4期106-106,共1页
大兴安岭东地区是重要的多金属成矿带。该区铜矿化主要与中生代酸性浅成一超浅成侵入体有密切的成因联系。文章论述了与铜矿化有关的中酸性浅成一超浅成侵入体的岩石学、岩石化学、微量元素特征,并阐述了该类型铜矿化的基本特点。
关键词 大兴安岭地区地质地球化学特征 铜矿化
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锡田含W,Sn花岗岩体的地球化学特征及其形成构造背景 被引量:41
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作者 马铁球 王先辉 柏道远 《华南地质与矿产》 CAS 2004年第1期11-16,共6页
以二长花岗岩类为主体的锡田岩体,分布在南岭花岗岩套北部边缘,形成时代为燕山早期。岩石具有高硅、富碱以及W,Sn,Mo,Bi,Cu和U,Th丰度高的特点。与湘南地区的骑田岭、香花岭等含Sn花岗岩体特征有相似之处,具有找W,Sn矿的较好潜力。岩石... 以二长花岗岩类为主体的锡田岩体,分布在南岭花岗岩套北部边缘,形成时代为燕山早期。岩石具有高硅、富碱以及W,Sn,Mo,Bi,Cu和U,Th丰度高的特点。与湘南地区的骑田岭、香花岭等含Sn花岗岩体特征有相似之处,具有找W,Sn矿的较好潜力。岩石地球化学综合研究表明,其具有典型的后造山(post—orogenic)作用形成的“A型花岗岩”类岩石的地球化学特征,从而显示锡田岩体形成时该区处于陆壳开始拉张裂陷的构造背景。 展开更多
关键词 花岗岩 地球化学 后造山 锡田岩 燕山早期 地质特征
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CSAMT法在深部地质结构探测中的应用 被引量:3
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作者 张阳 董博 丁发毅 《能源技术与管理》 2021年第5期153-155,共3页
CSAMT是深部勘探中常用的一种电磁探测方法,具有水平方向分辨率高、勘探深度大的优点。在深部地质结构探测中,采用大收发距进行测量,结果显示CSAMT法不仅可以了解地质体电阻率空间分布特征,判断断层的相对位置,而且能够了解深部地质体... CSAMT是深部勘探中常用的一种电磁探测方法,具有水平方向分辨率高、勘探深度大的优点。在深部地质结构探测中,采用大收发距进行测量,结果显示CSAMT法不仅可以了解地质体电阻率空间分布特征,判断断层的相对位置,而且能够了解深部地质体特征及空间展布,对研究关键构造带及块体展布具有很好的效果。 展开更多
关键词 CSAMT法 地层 断裂 深部地质体特征 展布
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基于形状上下文的成矿构造形态控矿特征深度学习及三维成矿预测——以大尹格庄金矿床为例 被引量:1
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作者 聂凡 魏运凤 +1 位作者 郑扬 邓浩 《地球科学前沿(汉斯)》 2021年第2期137-146,共10页
随着地质找矿工作逐步向深部空间的发展,深部矿、隐伏矿已成为找矿的主要对象。在对深部矿、隐伏矿的预测中,有效的成矿信息提取能够保证预测结果的准确性和可靠性。本文提出一种基于形状上下文的成矿构造形态控矿特征深度学习方法,以... 随着地质找矿工作逐步向深部空间的发展,深部矿、隐伏矿已成为找矿的主要对象。在对深部矿、隐伏矿的预测中,有效的成矿信息提取能够保证预测结果的准确性和可靠性。本文提出一种基于形状上下文的成矿构造形态控矿特征深度学习方法,以大尹格庄金矿床为研究对象,利用胶西北招平断裂带大尹格庄断离面趋势-起伏因素(waF、wbF)、断离面坡度因素(gF)、断离面陡缓转换部位综合场因素(fV)封装的三维形状上下文特征,利用深度学习中的图卷积神经网络,学习获得深层次的地质体形态控矿特征。研究表明,图卷积网络可提取更完备的地质体形态控矿特征,建立具有较好预测准确性的三维成矿预测模型。 展开更多
关键词 地质形态控矿特征 形状上下文 深度学习 图卷积神经网络
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东昆仑夏日哈木铜镍矿床特征 被引量:2
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作者 吴树宽 杨启安 +5 位作者 马玉辉 王治安 王彬 马国骅 常恩 孙亮 《现代矿业》 CAS 2016年第1期134-135,170,共3页
夏日哈木铜镍矿为东昆仑造山带内首例发现的超大型岩浆熔离型铜镍硫化物矿床,在对矿区地质特征、岩体地质特征、矿体地质特征分析的基础上,对矿石密度与Cu、Ni品位的相关性进行了探讨,为区内进一步开展找矿工作提供参考。
关键词 超大型岩浆熔离型矿床 地质特征 地质特征 相关性
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河北涞源木吉村矿田隐爆相角砾岩发育特征及其形成机制 被引量:2
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作者 吕贻峰 秦松贤 邓兆伦 《地球科学(中国地质大学学报)》 EI CSCD 北大核心 1989年第S1期121-127,共7页
河北涞源木吉村矿田内突出发育的隐爆相角砾岩,是该内生金属矿田的成矿同源岩体——闪长玢岩侵入晚期的产物。其形成和分布主要受成岩期构造控制。根据隐爆相角砾岩的地质发育特征将其分为四类:爆破角砾岩,震碎—震裂角砾岩、流化—侵... 河北涞源木吉村矿田内突出发育的隐爆相角砾岩,是该内生金属矿田的成矿同源岩体——闪长玢岩侵入晚期的产物。其形成和分布主要受成岩期构造控制。根据隐爆相角砾岩的地质发育特征将其分为四类:爆破角砾岩,震碎—震裂角砾岩、流化—侵入角砾岩、热液注入—交代角砾岩。 展开更多
关键词 隐爆相角砾岩 闪长玢岩 构造复合 河北省
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中国大陆中东部M_s≥8.0级特大地震发震背景初步分析 被引量:8
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作者 谭成轩 秦向辉 +5 位作者 王瑞江 龙长兴 邓乃恭 孙叶 张春山 孙炜锋 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2010年第A02期3598-3607,共10页
从构造地貌、地质体特征及其物理力学性质、现今GPS位移场、活动断裂与现代构造应力场和能量场等方面探讨中国大陆中东部部分Ms≥8.0级特大地震发震背景。初步认为,地震是地壳局部或区域活动的表现,诱发地震的主因来自地球内部地应力、... 从构造地貌、地质体特征及其物理力学性质、现今GPS位移场、活动断裂与现代构造应力场和能量场等方面探讨中国大陆中东部部分Ms≥8.0级特大地震发震背景。初步认为,地震是地壳局部或区域活动的表现,诱发地震的主因来自地球内部地应力、能量聚集和瞬间释放;发生地震的部位一般是地壳构造活动带或地壳结构的薄弱带,诸如活动断裂带等;活动断裂在发展演化过程中,当其穿过构造地貌、刚性结晶基底等特殊地质环境时,其活动受阻,引起地应力和能量集中。当地应力和能量积累超过岩体(石)强度,导致岩体(石)破裂,诱发地震;活动构造、地质体特征及其物理力学性质是地震发生的必要条件,地应力和能量集中是地震发生的充分条件。最后,提出中国大陆中东部中长期需重点关注的区带及工作建议。 展开更多
关键词 工程地质 Ms≥8.0级特大地震 构造地貌 地质体特征 现今GPS位移场 活动断裂 现代构造应力场和能量场
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Rock-forming mechanism of Qingshanjiao intrusion in Dongguashan copper(gold) deposit, Tongling area, Anhui province, China
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作者 刘忠法 邵拥军 +1 位作者 隗含涛 汪程 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第9期2449-2461,共13页
Dongguashan deposit is a large porphyry-skarn copper(gold) deposit in Tongling ore district. The Qingshanjiao intermediate acid intrusion of Yanshanian had a direct genetic relationship with mineralization. The magm... Dongguashan deposit is a large porphyry-skarn copper(gold) deposit in Tongling ore district. The Qingshanjiao intermediate acid intrusion of Yanshanian had a direct genetic relationship with mineralization. The magma origin, rock-forming dynamic background and rock-forming process were studied, and the rock-forming mechanism of Qingshanjiao intrusion was discussed, based on geological characteristics, detailed observation of petrography and systematic investigation of petrochemistry, trace elements and REE geochemistry characteristics of Qingshanjiao intrusion. The results show that Qingshanjiao rock body belongs to high-K calc-alkaline series with higher LREE elements, Th, Rb and Sr abundance, but depleted in HREE elements, Ba, Nb and Ta. The primary magma originated from the mantle-crust mixtures which were caused by basaltic magma of mantle mixing with syenite magma of partial melting of the lower crust, and the formation environment of Qingshanjiao intrusion was emplaced in the transitional environment from compression to extension. The Harker diagram and hybrid structures of plagioclase and potassium feldspar indicate that the fractional crystallization occurred in the process of magmatic evolution. The petrochemistry, trace elements and REE geochemistry characteristics indicate that the magma was contaminated by crustal material during the rock-forming. These results suggested that the Qingshanjiao intrusion was formed by fractional crystallization and assimilation and hybridization of mantle-crust magma in the transitional environment from compression to extensional. 展开更多
关键词 Qingshanjiao intrusion geological and geochemical characteristics rock-forming and geodynamic setting magma derivation rock-forming Dongguashan copper(gold) deposit
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灵丘县刁泉铜银矿矿床成因与岩浆岩关系研究
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作者 陈文华 韩丽娟 张冬梅 《华北国土资源》 2011年第2期1-3,共3页
为了解刁泉铜银矿岩浆岩体在成矿中的作用,从刁泉和小彦—枪头岭岩体的岩石类型、岩石化学特征的演化、稀土元素特征等几方面,阐述了这两个主要岩体的地质特征;并通过野外观察岩体的穿插关系,得出本区岩浆岩侵入具有多期性,岩浆的多期... 为了解刁泉铜银矿岩浆岩体在成矿中的作用,从刁泉和小彦—枪头岭岩体的岩石类型、岩石化学特征的演化、稀土元素特征等几方面,阐述了这两个主要岩体的地质特征;并通过野外观察岩体的穿插关系,得出本区岩浆岩侵入具有多期性,岩浆的多期侵入及岩浆期后热液长期活动,是本区多金属成矿的重要因素。 展开更多
关键词 铜银矿床 地质特征 矿床成因 重要因素
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Engineering geological classification of the structural planes for hydroelectric projects in Emeishan Basalts 被引量:3
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作者 SUN Shu-qin HUANG Run-qiu +1 位作者 PEI Xiang-jun ZHAO Song-jiang 《Journal of Mountain Science》 SCIE CSCD 2016年第2期330-341,共12页
The scale and characteristics of rock mass are important indexes of the rock mass structural plane classification. This paper firstly analyzes the spatial distribution characteristics, the structural plane types (ori... The scale and characteristics of rock mass are important indexes of the rock mass structural plane classification. This paper firstly analyzes the spatial distribution characteristics, the structural plane types (original structural plane, tectonic structural plane and hypergenic structural plane) and the associated features of the Emeishan basalts and then studies the classification schemes of the built hydropower structure planes of different rock areas (the east district, the central district and the west district) in the Emeishan basalt distribution area, Southwest China. Based on the analysis and comparison of the scale and the engineering geological characteristics of the typical structure planes in the basalt hydroelectric Stations, the types of structural planes are used in the first order classification. The secondary order classification is made by considering the impact factors of rock mass quality, e.g., the state of the structural planes, infilling, joint opening, extending length, the grade of weathering and strength. The engineering geological classification for Emeishan basalt is proposed. Because there are no evidences of a large structure presenting in study area, the first-order (Ⅰ) controlling structural planes do not appear in the classification, there only appear Ⅱ, Ⅲ, Ⅳ and Ⅴ grade structural planes influencing the rock-mass quality. According to the different rock-block types in bedding fault zone, the second-grade (Ⅱ) structural planes consisted of bedding fault zone is further classified into Ⅱ1, Ⅱ2 and Ⅱ3. The third-grade (Ⅲ) structural planes constructed by intraformational faulted zones are not subdivided. According to the different characteristics of intrusion, alteration and weathering unloading structural planes, the Ⅳ grade structure plane is divided into Ⅳ1, Ⅳ2 and Ⅳ3. According to the development characteristics of joints and fractures, the V grade structure plane is divided into fracture Ⅴ1 and columnar joint Ⅴ2. In all, the structural planes are classified into four groups with nine subsets. The research proposes the engineering geological classification of the structural plane for the hydropower project in the Emishan basalts, and the result of the study has a potential application in similar regions. 展开更多
关键词 Emeishan basalt Hydroelectric project Structural plane Bedding fault zone Engineering geological classification
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Petrographic characteristics coals, Mahanadi Gondwana and paleomires of Mand-Raigarh Basin, Chhattisgarh, India
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作者 A. S. Naik M. P. Singh +3 位作者 N. Volkmann P. K. Singh D. Mohantya D. Kumar 《International Journal of Coal Science & Technology》 EI 2016年第2期165-183,共19页
Mand-Raigarh coalfield is one of the largest coalfields in the Mahanadi basin. The Geological Survey of India carried out initial study primarily on exploration. However, detailed petrographic and geochemical characte... Mand-Raigarh coalfield is one of the largest coalfields in the Mahanadi basin. The Geological Survey of India carried out initial study primarily on exploration. However, detailed petrographic and geochemical characters of the coals have not been done so far. This investigation is an attempt for petrographic and geochemical appraisal of the coals. Moreover, effort is also made for possible interpretation on development of coal facies. The results drawn from 30 composite coal samples suggest coals are rich in vitrinite, with collotelinite as the dominant maceral while liptinite macerals register low concentration. Dominant mineral assemblages found were clay minerals, pyrite was recorded as disseminated, framboidal and euhedral forms, carbonates recorded were mainly siderites. The vitrinite reflectance random (VRo) mean values range from 0.44 % to 0.56 %, and the rank of coal is suggested as high volatile 'B' to 'A' sub- bituminous in rank. The rock-eval pyrolysis reveal TOC content varying from 37 % to 68.83 %, while low hydrocarbon generating potential is evident from low $2 and Tmax values. The Hydrogen Index (HI) versus Oxygen Index (OI) plot reveal that the samples belong to Kerogen type--II-III with input dominantly from terrestrial source, some samples also fall in Kerogen type--II domain indicating lacustrine input. Vitrinite reflectance result indicate that the samples are immature and approaching oil window, which is in agreement with data of the Rock-Eval parameters. The gelification index (GI) and tissue preservation index (TPI) indicate that the coal developed in a telematic set up with high tree density. The ground water index (GWI) and vegetation index (VI) demonstrate that the peat developed as an ombrogenous bog. 展开更多
关键词 Mand-Raigarh coalfield Organic petrology GEOCHEMISTRY Source rock
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彝良县某中-深层大型岩质高陡滑坡形成条件分析及治理
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作者 赵正友 姜庆钱 陈策 《云南冶金》 2021年第6期9-14,共6页
通过对彝良县某中-深层大型岩质高陡边坡滑坡地质灾害体特征、形成条件进行综合分析,评价其稳定性,采用分段互层叠加卸载、分力治理、裂缝充填等技术措施综合治理,建立健全治理前、后监测系统,观测分析治理效果,评价其治理后稳定性,为... 通过对彝良县某中-深层大型岩质高陡边坡滑坡地质灾害体特征、形成条件进行综合分析,评价其稳定性,采用分段互层叠加卸载、分力治理、裂缝充填等技术措施综合治理,建立健全治理前、后监测系统,观测分析治理效果,评价其治理后稳定性,为类似中-深层大型岩质高陡边坡滑坡治理提供技术选择参考。 展开更多
关键词 地质灾害特征 高陡 滑坡稳定性 治理措施 抗滑桩 互层叠加 监测
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Advances in Sinopec's Shale Gas Drilling Technologies
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作者 Zang Yanbin Zhang Jincheng 《China Oil & Gas》 CAS 2016年第1期16-21,共6页
In order to economically and effectively develop shale gas in China, Sinopec introduced foreign technologies and integrated them with available domestic technologies and self-developed tools according to geological ch... In order to economically and effectively develop shale gas in China, Sinopec introduced foreign technologies and integrated them with available domestic technologies and self-developed tools according to geological characteristics and complicated mountainous geomorphology in marine shale plays of southern China. A technology series composed of innovated theories concerning geological characterization during drilling, new generation of PDC bits, friction-reducing tools, low-cost oil-based drilling fluid system, high-efficient washing fluid and elastic mud systems, integrated drilling engineering design, long lateral cementing, modified well facto~ drilling method and etc., was developed to ful)qll fast and optimized drilling for shale gas wells. The application of the technology series in about 251 wells of Fuling gas Jield, Chongqing City, southwestern China, showed positive results: mechanical rotating speed increased by 191%, drilling duration redueed by 53%, and quality passing percent 100%. 展开更多
关键词 SINOPEC Shale gas DRILLING Drilling fltuid CEMENTING Well factory
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Mechanism of spatial emplacement of Shanhou gold ore body in Laixi of Shandong and its prospecting significance
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作者 LIU Fengxu WANG Li +2 位作者 WANG Dunrong XU Jingge CUI Zhiyong 《Global Geology》 2016年第3期144-152,共9页
Through analysis of geological characteristics of the gold deposit,the shape,occurrence,and spatial distribution of ore-controlling fault plane in the Shanhou mining area were investigated,and the regularities of enri... Through analysis of geological characteristics of the gold deposit,the shape,occurrence,and spatial distribution of ore-controlling fault plane in the Shanhou mining area were investigated,and the regularities of enrichment and emplacement of ore body were summarized. The analysis shows that the Shanhou gold deposit was controlled by NE-NNE Zhaoping fault zone; the fault gouge developed in fault zone provides a barrier to ore-bearing hydrothermal solution,and the industrial ore body is all distributed within 40 m of footwall of main fault plane. The industrial ore body is mainly enriched in the NE positions of fault where the deep dips changed to flat dips,and shows the obvious regularity of NE lateral trending with angle around 75°. The stress analysis of fault in mineralization epoch showed that the ore-controlling structure presented the characteristics of righthanded rotation inverse-fault activity in mineralization epoch,and the host space tended to occur in NE regional tension positions where the dips become flat in the strike of fault,causing emplacement of ore body. It is thought by combining equal interval distribution of deposit with spatial variation of industrial ore body and orecontrolling fault structure that the Shanhou gold deposit recurred in regularity and the non-ore interval occurred in the ore body. Meanwhile,it is predicted that the favorable target area of prospecting lies in the areas of deep main fault plane with NE strike( > 30°) and the deep dips changing to flat dips in the Shanhou mining area,and the prospecting should be emphasized. The favorable deep mineralization prospect exists in middle Beibo mining area,where is the key area for future prospecting. 展开更多
关键词 spatial emplacement Shanhou deposit Laixi SHANDONG
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XU Xiaohui,CHEN Hui'e and WANG Gangcheng College of Construction Engineering,Jilin University,Changchun 130026,China
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作者 XU Xiaohui CHEN Hui'e WANG Gangcheng 《Global Geology》 2013年第3期159-163,共5页
On the basis of geological investigating work and experimental studies on slide zone soil of one landslide in Tibet,the authors analyzed granulometric composition,clay mineral composition and physical and mechanical p... On the basis of geological investigating work and experimental studies on slide zone soil of one landslide in Tibet,the authors analyzed granulometric composition,clay mineral composition and physical and mechanical properties for the soil in the slide zone.The soil samples are gravel containing fine particle.Particles larger than 2 mm occupy the main proportion with the content 51.5%--68.5%.The relative content of clay minerals is low.The clay minerals are illite smectite mixed layer and kaolinite,and their relative contents are 6%--13% and 4%-11%,respectively.The main mineral ingredient is quartz and the relative content is over 30%.Therefore,the soil’s hydrophily is poor.The cohesion and internal friction angle are high,causing preferable physical-mechanical features of slide zone soil.On the basis of the obtained data,the landslide stability is evaluated by means of limit equilibrium method.The safety factors are 3.191 and 1.92 respectively under both natural and normal water level conditions.The study results show that the landslide is stable.It can provide the appropriate basis and reference for landslide stability evaluation and landslide control in Tibet. 展开更多
关键词 slide zone soil granulometric composition clay mineral composition physical-mechanical proper-ty landslide stability analysis
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