期刊文献+
共找到12篇文章
< 1 >
每页显示 20 50 100
河流冲积含粘土质石英砂矿的综合利用
1
作者 董风芝 杨赞中 程振霞 《中国非金属矿工业导刊》 1998年第3期24-26,共3页
本文对石英含量较低、矿物组成简单的河流冲积含粘土质石英砂矿的综合利用进行了研究。经擦洗、分级即可分离出较高质量的石英砂 ;细砂经浮选可分离为符合玻璃、陶瓷工业要求的石英、长石两种产品 ;细泥则可直接用作建筑陶瓷、日用陶瓷... 本文对石英含量较低、矿物组成简单的河流冲积含粘土质石英砂矿的综合利用进行了研究。经擦洗、分级即可分离出较高质量的石英砂 ;细砂经浮选可分离为符合玻璃、陶瓷工业要求的石英、长石两种产品 ;细泥则可直接用作建筑陶瓷、日用陶瓷生产的坯料 ,可大大降低生产成本。 展开更多
关键词 河流冲积 石英砂矿 含粘土质 综合利用 陶瓷坯料
下载PDF
川东淀粉厂含碎石粉质粘土滑坡稳定性研究 被引量:4
2
作者 颜宇森 雷海英 《水文地质工程地质》 CAS CSCD 北大核心 2008年第3期19-22,27,共5页
由于结构的复杂性,含碎石粉质粘土的工程性质很难由常规土力学试验准确确定。论文以川东淀粉厂滑坡为例,通过现场试验、室内试验和工程类比,研究了含碎石粉质粘土的抗剪强度等指标的确定方法,探讨了含碎石粉质粘土滑坡的形成机制、控制... 由于结构的复杂性,含碎石粉质粘土的工程性质很难由常规土力学试验准确确定。论文以川东淀粉厂滑坡为例,通过现场试验、室内试验和工程类比,研究了含碎石粉质粘土的抗剪强度等指标的确定方法,探讨了含碎石粉质粘土滑坡的形成机制、控制因素和地质模型,应用极限平衡理论方法分析了在现状、暴雨和三峡水库蓄水后水位动态变化等环境条件下的滑坡稳定性。 展开更多
关键词 碎石粉粘土 滑坡 稳定性
下载PDF
某震后高边坡含砾粉质粘土强度的正交试验研究 被引量:1
3
作者 杨萍 朱占元 《四川建筑科学研究》 2012年第4期119-122,共4页
以四川省平通镇牛斐村大咀山震后高边坡上含砾粉质粘土为研究对象,通过正交试验,研究含水量、干密度和粗粒含量3个因素对震后土体抗剪强度的影响。试验得出3个因素对震后含砾粉质粘土抗剪强度指标影响的主次顺序和各因素的显著性水平。... 以四川省平通镇牛斐村大咀山震后高边坡上含砾粉质粘土为研究对象,通过正交试验,研究含水量、干密度和粗粒含量3个因素对震后土体抗剪强度的影响。试验得出3个因素对震后含砾粉质粘土抗剪强度指标影响的主次顺序和各因素的显著性水平。且在此基础上提出了震后含砾粉质粘土抗剪强度指标的计算公式。这些将为震后土体强度参数研究积累基础资料,并为强降雨等不利条件下高边坡安全性评价提供参考。 展开更多
关键词 抗剪强度 正交试验 砾粉粘土 5.12汶川地震
下载PDF
含砾粉质粘土中粗颗粒对抗剪强度影响的研究 被引量:3
4
作者 金福喜 秦帅帅 余政兴 《土工基础》 2019年第4期510-514,共5页
滑带土为含砾粉质粘土的土质滑坡,其滑带土抗剪强度参数受粗颗粒影响较大,而滑坡勘查工程通常只做直剪试验而很少进行三轴试验,由于土的直剪试验受环刀尺寸的限制,试验时常筛除含砾粉质粘土中的粗颗粒,导致试验结果与真实值存在偏差。因... 滑带土为含砾粉质粘土的土质滑坡,其滑带土抗剪强度参数受粗颗粒影响较大,而滑坡勘查工程通常只做直剪试验而很少进行三轴试验,由于土的直剪试验受环刀尺寸的限制,试验时常筛除含砾粉质粘土中的粗颗粒,导致试验结果与真实值存在偏差。因此,根据原状含砾粉质粘土级配配制不同粒径的饱和土样进行三轴剪切试验,并结合剔除原状土粗颗粒的饱和土样进行快剪试验,分析含砾粉质粘土中粗颗粒对其抗剪强度的影响。试验结果表明:随着逐级减小粗颗粒粒径,含砾粉质粘土的黏聚力呈现先增大后减小的变化趋势,内摩擦角则呈现逐渐减小的变化趋势,对比不同粒径下黏聚力和内摩擦角的变化量,为浏阳地区滑坡工程设计中所需岩土参数提供一定的参考价值。 展开更多
关键词 砾粉粘土 粗颗粒 粒径 黏聚力 内摩擦角
原文传递
Key Variables Explaining Soil Organic Carbon Content Variations in Croplands and Non-Croplands in Chinese Provinces 被引量:2
5
作者 WU Lezhi CAI Zucong 《Chinese Geographical Science》 SCIE CSCD 2012年第3期255-263,共9页
Soil organic carbon (SOC) plays an important role in global carbon cycles.Large spatial variations in SOC contents result in uncertain estimates of the SOC pool and its changes.In the present study,the key variables e... Soil organic carbon (SOC) plays an important role in global carbon cycles.Large spatial variations in SOC contents result in uncertain estimates of the SOC pool and its changes.In the present study,the key variables explaining the SOC contents of croplands (CPs) and non-croplands (NCPs) in Chinese provinces were investigated.Data on SOC and other soil properties (obtained from the Second National Soil Survey conducted in the late 1970s to the early 1990s),climate parameters,as well as the proportion of the CP to the total land area (Pcp) were used.SOC content variations within a province were larger than those among provinces.Soil clay and total phosphorus content,ratio of annual precipitation to mean temperature,as well as Pcp were able to explain 75% of the SOC content variations in whole soil samples.Soil pH,mean temperature during the growing season from May to October,and mean annual wind velocity were able to explain 63% of the SOC content variations in NCP soils.Compared with NCP soils,CP soils had lower SOC contents,with smaller variations within and among provinces and lower C/N ratios.Stepwise regression showed that the soil clay content was a unique factor significantly correlated with the SOC content of CP soils.However,this factor only explained 24% of the variations.This result suggested that variables related to human activities had greater effects on SOC content variations in CP soils than soil properties and climate parameters.Based on SOC contents directly averaged from soil samples and estimated by regression equations,the total SOC pool in the topsoil (0-20 cm) of China was estimated at 60.02 Pg and 57.6 Pg.Thousands of years of intensive cultivation in China resulted in CP topsoil SOC loss of 4.34-4.98 Pg. 展开更多
关键词 soil organic carbon land use carbon loss soil property climatic variable
下载PDF
花岗岩嵌岩灌注桩桩顶夹泥现象成因分析 被引量:1
6
作者 郭子锋 《福建建筑》 2010年第12期90-92,共3页
本文根据福建沿海海滨区花岗岩嵌岩钻孔灌注桩桩基工程施工经历,针对桩基施工中出现的桩顶夹泥这一质量缺陷现象进行了总结和分析,可为其他类似工程施工提供有益的借鉴。
关键词 嵌岩钻孔灌注桩 花岗岩 冲击岩屑 砂粉粘土 桩顶夹泥
下载PDF
北汝河倒虹吸工程基础顶托破坏分析及处理措施
7
作者 黄秋风 孙熙 李雪艳 《河南科技》 2013年第8X期37-38,共2页
深基坑开挖过程中常发生基础顶托破坏事件,本文以北汝河倒虹吸工程混凝土垫层顶托破坏为例,通过破坏的各种现象并结合地质情况,分析得出其破坏的主要原因为裂隙承压水所致,通过降低承压水头和换填相结合的方法,既满足了工程安全的要求,... 深基坑开挖过程中常发生基础顶托破坏事件,本文以北汝河倒虹吸工程混凝土垫层顶托破坏为例,通过破坏的各种现象并结合地质情况,分析得出其破坏的主要原因为裂隙承压水所致,通过降低承压水头和换填相结合的方法,既满足了工程安全的要求,同时降低了降压成本,实践证明此处理方案可行,可以作为其它类似地质情况的深开挖工程处理方案。 展开更多
关键词 顶托破坏 倒虹吸 粘土 裂隙承压水 换填法
下载PDF
Geochemical characteristics of Galandrud coal in central Alborz, Iran 被引量:1
8
作者 Ardebili Leila Babazadeh Vasef +1 位作者 Mammadov Mousa Navi Pedram 《International Journal of Mining Science and Technology》 2012年第1期101-106,共6页
This study focuses on the geochemistry of trace elements and parameters of coal quality of bituminous coal belonging to the upper Triassic-lower Jurassic era, collected from the Galandrud region in Central Alborz, nor... This study focuses on the geochemistry of trace elements and parameters of coal quality of bituminous coal belonging to the upper Triassic-lower Jurassic era, collected from the Galandrud region in Central Alborz, northern Iran. Galandrud coal on an air-dried basis are characterized by broad variation in the amount of ash (ranging from 6.49g to 12.73%), a high content of volatile matter (33,32-37.45%) and high gross calorific values (7430-8880 kcal/kg). The mineral matter of the coal samples studied is made up of dolomite (〉909g), quartz, sphalerite, galena, pyrite and clay minerals. Major elements are positively cor- related with ash content suggesting an association with inorganic constituents. Based on statistical anal- yses, concentrations of trace elements such as Co (51.3 ×10^-6-152.9× 10^-6), Ba (368× 10^-6-3297.4×10^-6), Cr (65.5 ×10^-6-194.2 × 10^-6), Mo (5.6 × 10^-6-18.2× 10^-6), Hi (72.9 × 10^-6-152.9 × 10^-6) and V (245.5 × 10^-6-520 ×10^-6) are higher than world coal averages. However, low concentration of some vol- atile elements such as As, Hg and U are present in low concentrations of the various types of coal studied. 展开更多
关键词 Galandrud coals GEOCHEMISTRY Trace elements Central Alborz lran
下载PDF
An Experimental Study on the Wave-Induced Pore Water Pressure Change and Relative Influencing Factors in the Silty Seabed
9
作者 LI Anlong LUO Xiaoqiao +2 位作者 LIN Lin YE Qing LI Chunyu 《Journal of Ocean University of China》 SCIE CAS 2014年第6期911-916,共6页
In this study, a flume experiment was designed to investigate the characteristics of wave-induced pore water pressure in the soil of a silty seabed with different clay contents, soil layer buried depths and wave heigh... In this study, a flume experiment was designed to investigate the characteristics of wave-induced pore water pressure in the soil of a silty seabed with different clay contents, soil layer buried depths and wave heights respectively. The study showed that water waves propagating over silty seabed can induce significant change of pore water pressure, and the amplitude of pore pressure depends on depth of buried soil layer, clay content and wave height, which are considered as the three influencing factors for pore water pressure change. The pressure will attenuate according to exponential law with increase of soil layer buried depth, and the attenuation being more rapid in those soil layers with higher clay content and greater wave height. The pore pressure in silty seabed increases rapidly in the initial stage of wave action, then decreases gradually to a stable value, depending on the depth of buried soil layer, clay content and wave height. The peak value of pore pressure will increase if clay content or depth of buried soil layer decreases, or wave height increases. The analysis indicated that these soils with 5% clay content and waves with higher wave height produce instability in bed easier, and that the wave energy is mostly dissipated near the surface of soils and 5% clay content in soils can prevent pore pressure from dissipating immediately. 展开更多
关键词 wave action silty seabed pore water pressure development influencing factor
下载PDF
Diesel oil infiltration in soils with selected antecedent water content and bulk density
10
作者 马艳飞 李永霞 +3 位作者 S.H.Anderson 郑西来 冯雪冬 高佩玲 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第8期1924-1930,共7页
The effects of soil texture, initial water content and bulk density on diesel oil infiltration in fine sand and silty clay loam materials were evaluated. Three physical and two empirical equations express diesel oil i... The effects of soil texture, initial water content and bulk density on diesel oil infiltration in fine sand and silty clay loam materials were evaluated. Three physical and two empirical equations express diesel oil infiltration through soils with time, with coefficients of determination greater than 0.99. Diesel oil infiltrates more quickly in the fine sand than in the silty clay loam material. Diesel oil infiltration rates are found to decrease with increasing initial water content and bulk density for the silty clay loam material. The infiltration rate of diesel oil in the fine sand material increases slightly with increasing initial water content. The diesel oil saturated conductivity(Kdiesel) decreases with increasing bulk density for the silty clay loam column. Diesel oil sorptivity(S) decreases linearly with increased initial water content and bulk density of the silty clay loam material. Changes in empirical parameters relative to initial water content and bulk density are similar to the parameter S. 展开更多
关键词 INFILTRATION diesel oil SOIL physical and empirical models initial water content bulk density
下载PDF
滑带土参数变化对滑坡稳定性影响的数值模拟分析 被引量:1
11
作者 秦帅帅 张战胜 +1 位作者 张星辰 张鹏 《土工基础》 2023年第4期615-618,共4页
随着国家经济的迅猛发展,基础设施的建设越发完善,对边坡原始地貌的人为改造打破了原本的平衡状态,进而诱发了一系列的斜坡地质灾害。以浏阳市某滑坡为背景,以含砾粉质黏土滑坡为研究对象,从滑坡体的渐进式破坏出发,着重分析研究滑带土... 随着国家经济的迅猛发展,基础设施的建设越发完善,对边坡原始地貌的人为改造打破了原本的平衡状态,进而诱发了一系列的斜坡地质灾害。以浏阳市某滑坡为背景,以含砾粉质黏土滑坡为研究对象,从滑坡体的渐进式破坏出发,着重分析研究滑带土参数的变化对滑坡整体稳定性的影响。在收集资料、现场详细勘察和室内试验的基础上,采用ABAQUS数值模拟软件建立地质模型,并从滑坡塑性区、位移和稳定性三个方面,对比不同滑带土的模拟结果,分析滑带土参数的变化对滑坡稳定性的影响,为该类型的滑坡防治提供参考。 展开更多
关键词 砾粉粘土 滑带土 参数 数值模拟 稳定性
原文传递
Joint Multifractal Analysis of Scaling Relationships Between Soil Water-Retention Parameters and Soil Texture 被引量:2
12
作者 WANG Zheng-Ying SHU Qiao-Sheng +2 位作者 XIE Li-Ya LIU Zuo-Xin B. C. SI 《Pedosphere》 SCIE CAS CSCD 2011年第3期373-379,共7页
Soil water-retention characteristics at measurement scales are generally different from those at application scales, and there is scale disparity between them and soil physical properties. The relationships between tw... Soil water-retention characteristics at measurement scales are generally different from those at application scales, and there is scale disparity between them and soil physical properties. The relationships between two water-retention parameters, the scaling parameter related to the inverse of the air-entry pressure (avG, cm- 1) and the curve shape factor related to soil pore-size distribution (n) of the van Genuchten water-retention equation, and soil texture (sand, silt, and clay contents) were examined at multiple scales. One hundred twenty-eight undisturbed soil samples were collected from a 640-m transect located in Fuxin, China. Soil water-retention curves were measured and the van Genuchten parameters were obtained by curve fitting. The relationships between the two parameters and soil texture at the observed scale and at multiple scales were evaluated using Pearson correlation and joint multifractal analyses, respectively. The results of Pearson correlation analysis showed that the parameter c^vG was significantly correlated with sand, silt, and clay contents at the observed scale. Joint multifractal analyses, however, indicated that the parameter ~vG was not correlated with silt and sand contents at multiple scales. The parameter n was positively correlated with clay content at multiple scales. Sand content was significantly correlated with the parameter n at the observed scale but not at multiple scales. Clay contents were strongly correlated to both water-retention parameters because clay content was relatively low in the soil studied, indicating that water retention was dominated by clay content in the field of this study at all scales. These suggested that multiple-scale analyses were necessary to fully grasp the spatial variability of soil water-retention characteristics. 展开更多
关键词 clay content multiple-scale analysis sand content silt content van Genuchten parameters
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部