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土钉支护工程中水作用机理分析 被引量:8
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作者 王滨 贺可强 赵民 《工程勘察》 CSCD 北大核心 2002年第2期14-16,共3页
水的作用是土钉支护工程事故主要原因。本文从土钉支护机理出发阐述了水对土钉墙的两种作用 :水土作用与水钉作用 ,并提出了由于水的作用而导致的土钉墙体失稳破坏的机制。
关键词 土钉 支护 水作用机理 失稳破坏机制
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干湿循环作用下水对膨胀土路基破坏机理的试验研究 被引量:33
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作者 刘义虎 杨果林 黄向京 《中外公路》 北大核心 2006年第3期30-35,共6页
通过8组膨胀土路基模型试验,对广西南友路宁明地段中等膨胀土和湖南常张路慈利地段弱膨胀土,在90%压实度条件和不同排水边界条件下,分别模拟路基在积水、阴天、日照、降雨干湿循环作用下,膨胀土路基的破坏形式、水对膨胀土路基破坏作用... 通过8组膨胀土路基模型试验,对广西南友路宁明地段中等膨胀土和湖南常张路慈利地段弱膨胀土,在90%压实度条件和不同排水边界条件下,分别模拟路基在积水、阴天、日照、降雨干湿循环作用下,膨胀土路基的破坏形式、水对膨胀土路基破坏作用机理等,这对膨胀土路基的设计和施工,保护路基、路面和构造物等具有重要的理论和工程实际意义。 展开更多
关键词 干湿循环 膨胀土路基 损害作用机理 破坏形式 模型试验
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沥青路面水损害机理与防治措施的研究 被引量:14
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作者 杨成忠 邹启贤 《筑路机械与施工机械化》 2003年第4期7-9,共3页
通过对沥青路面混合料三相结构的静水作用机理和动水作用机理以及沥青—集料的机械粘附理论、化学反应理论、表面能理论、极性理论、表面构造理论的粘附—剥落机理研究,介绍了沥青路面水损害的防治措施。
关键词 沥青路面 损害 水作用机理 防治措施 三相结构 软化 剥落 压力作用机理 材料 系统
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焦家金矿床水-岩反应过程及成矿流体组分变化规律 被引量:2
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作者 刘亚洲 王恩敬 +3 位作者 王偲瑞 郭广军 李大鹏 张炳林 《高校地质学报》 CAS CSCD 北大核心 2018年第6期907-917,共11页
在野外和室内岩相学观察的基础上,详细剖析了蚀变-矿化时序,结合热力学数值模拟方法与定量结果,厘定了水-岩反应过程中矿物的沉淀次序、流体组分的存在形式、迁移行为、浓度变化和矿物形成机制以及组分之间的化学反应,为进一步研究水-... 在野外和室内岩相学观察的基础上,详细剖析了蚀变-矿化时序,结合热力学数值模拟方法与定量结果,厘定了水-岩反应过程中矿物的沉淀次序、流体组分的存在形式、迁移行为、浓度变化和矿物形成机制以及组分之间的化学反应,为进一步研究水-岩反应与金矿化的关系奠定了基础。研究结果显示反应初期K+由流体带入围岩形成钾长石化,随着反应的进行,H+浓度持续降低而Fe^(2+)和Al^(3+)含量升高,绢云母和石英大量沉淀,钾长石消失;反应后期各类硫化物开始沉淀,石英持续沉淀贯穿整个反应过程。成矿流体中SO4^(2-),HS-,Fe^(2+)的含量对蚀变矿物组合影响很大;水-岩反应过程中硫酸盐(SO4^(2-))减少生成等量的HS-并伴随着含三价铁矿物的沉淀,可能是焦家金矿床硫化物沉淀的一种重要机制。整个反应过程中溶液pH值持续升高是原岩中Ca,K,Na,Mg等与溶液中H+发生交换反应的结果;同时pH值的升高也会降低金的溶解度致使金沉淀。上述研究成果对于理解岩石中的矿物共生组合、生成顺序及蚀变分带的成因机制提供了新的依据。 展开更多
关键词 -岩反应过程 -岩作用机理 热力学模拟 蚀变-矿化 焦家金矿床
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Complete removal of phenolic contaminants from bismuth-modified TiO2 single-crystal photocatalysts 被引量:5
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作者 Wenjie Tang Juanrong Chen +4 位作者 Zhengliang Yin Weichen Sheng Fengjian Lin Hui Xu Shunsheng Cao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第2期347-355,共9页
Exploring low-cost and highly active photocatalysts is very urgent to accomplish complete removal of phenolic contaminants and overcome the limitations of the existing photocatalysts.In this study,we designed and synt... Exploring low-cost and highly active photocatalysts is very urgent to accomplish complete removal of phenolic contaminants and overcome the limitations of the existing photocatalysts.In this study,we designed and synthesized noble metal-free TiO2 photocatalysts by introducing bismuth nanoparticles as modifiers of a TiO2 single crystal(Bi-SCTiO2).The Bi-SCTiO2 can make full use of the synergistic effect of a small band overlap and low charge carrier density(Bi)with a high conductivity(single crystal),significantly boosting the separation and migration of the photogenerated charge pairs.Therefore,the Bi-SCTiO2 photocatalyst exhibits a significantly enhanced degradation rate(12 times faster)of 4-nitrophenol than a TiO2 single crystal under simulated sunlight irradiation.Notably,the complete removal of phenolic contaminants is achieved in various water matrices,which not only successfully overcomes the incomplete degradation in many reported photocatalytic systems,but also manifests a significant practical potential for sewage disposal.Therefore,this work presents a new insight in designing and constructing noble metal-free decorated semiconductor single-crystal photocatalysts with excellent activity and cyclability. 展开更多
关键词 Bi modification TiO2 single crystal Phenolic pollutants Complete removal Water matrix Degradation mechanism Photocatalysis
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Study on “triangle” water-inrush mode of strong water-guide collapse column 被引量:3
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作者 LI Zhen-hua FENG Guo-rui ZHAI Chang-zhi 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第9期2402-2409,共8页
The water-inrush mechanism of strong water-guide collapse column in coal seam is studied based on the establishment of geological and mathematical models of "triangle" water-inrush mode. The geological backg... The water-inrush mechanism of strong water-guide collapse column in coal seam is studied based on the establishment of geological and mathematical models of "triangle" water-inrush mode. The geological background of Shuangliu mine is considered a prototype, similar simulation tests are adopted to analyze the water-inrush rules under this model, and the formation of water-guide channel and water-inrush process is investigated by examining the changes in rock resistivity. This work also uses the coupled cloud image derived from numerical simulation software to verify the results of simulation test. Results show that the numerical simulation of "triangle" water-inrush mode is consistent with the similar simulation. The "triangle" seepage area, which is located at the bottom of collapse columns and is connected to aquifer, is caused by the altered seepage direction and strengthened seepage actions after the overlapping of hydraulic transverse seepage in collapse column and hydraulic vertical seepage flow in aquifer. Under "triangle"water-inrush model, water-guide channel is formed by the communication between plastic failure zone of working face baseplate and"triangular" seepage area. Accordingly, the threatening water-inrush distance between working face and collapse column increases by 20 m compared with that of theoretical calculation. 展开更多
关键词 strong water-guide collapse column "triangle" water-inrush mode similar simulation numerical simulation SEEPAGE
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Research of Toxic Mechanism on Anaerobic Digestion by Lead
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作者 Han Jianhong Wang Zhe +1 位作者 Zhang Lianke Han Jintao 《Chinese Journal of Population,Resources and Environment》 北大核心 2008年第1期87-90,共4页
The paper analyzes the influence of lead toxicity by anaerobic granule sludge inhibition and recovering experiments. The result shows that there are different inhibition types at differ-ent lead contents. Higher lead ... The paper analyzes the influence of lead toxicity by anaerobic granule sludge inhibition and recovering experiments. The result shows that there are different inhibition types at differ-ent lead contents. Higher lead content leads to more inhibition granular sludge, and at the same time, the time of gas recovery is different. Lower lead content per microorganism results in sooner sludge recovery. Microorganisms have a good ability to resist lead toxicity. 展开更多
关键词 LEAD granular sludge TOXICITY INHIBITION
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Adsorption Mechanism of Water Molecule on Goethite(010) Surface
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作者 XIU Fangyuan ZHOU Long +1 位作者 XIA Shuwei YU Liangmin 《Journal of Ocean University of China》 SCIE CAS 2016年第6期1021-1026,共6页
Abstract Goethite widely exists among ocean sediments; it plays an important role in fixing heavy metals and adsorbing organic contaminants. So the understanding of the adsorbing process of water molecule on its surfa... Abstract Goethite widely exists among ocean sediments; it plays an important role in fixing heavy metals and adsorbing organic contaminants. So the understanding of the adsorbing process of water molecule on its surface will be very helpful to further reveal such environmental friendly processes. The configuration, electronic properties and interaction energy of water molecules adsorbed on pnma goethite (010) surface were investigated in detail by using density functional theory on 6-31G (d,p) basis set and projec- tor-augment wave (PAW) method. The mechanism of the interaction between goethite surface and H20 was proposed. Despite the differences in total energy, there are four possible types of water molecule adsorption configurations on goethite (010) surface (Aa, Ab, Ba, Bb), forming coordination bond with surface Fe atom. Results of theoretical modeling indicate that the dissociation process of adsorbed water is an endothermic reaction with high activation energy. The dissociation of adsorbed water molecule is a proton transportation process between water's O atoms and surface. PDOS results indicate that the bonding between 1-120 and (010) surface is due to the overlapping of water's 2p orbitals and Fe's 3d orbitals. These results clarify the mechanism on how adsorbed water is dissociated on the surface of goethite and potentially provide useful information of the surface chemistry of goethite. 展开更多
关键词 density functional theory GOETHITE WATER ADSORPTION
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Soil Microbial Community-Level Physiological Profiling as Related to Carbon and Nitrogen Availability Under Different Land Uses 被引量:2
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作者 Marfa Celina ZABALOY Jay L. GARLAND +1 位作者 Marco ALLEGRINI Elena del Valle GOMEZ 《Pedosphere》 SCIE CAS CSCD 2016年第2期216-225,共10页
The goal of this work was to assess soil microbial respiration, determined by the assay of community-level physiological profiling in an oxygen-sensitive microplate (O2-CLPP), in response to endogenous C and several... The goal of this work was to assess soil microbial respiration, determined by the assay of community-level physiological profiling in an oxygen-sensitive microplate (O2-CLPP), in response to endogenous C and several individual C substrates in the soils with different organic C contents (as a function of soil type and management practice). We also used the O2-CLPP to determine the respiratory response of these soils to endogenous C and amended C substrates with N addition. A respiratory quotient (RQ) was calculated based on the ratio of the response to endogenous soil C vs. each C-only substrate, and was related to total organic carbon (TOC). For assessing N availability for microbial activity, the effect of N supplementation on soil respiration, expressed as Nr^tio, was calculated based on the response of several substrates to N addition relative to the response without N. Soils clustered in 4 groups after a principal component analysis (PCA), based on TOC and their respiratory responses to substrates and endogenous C. These groups reflected differences among soils in their geographic origin, land use and C content. Calculated RQ values were significantly lower in natural forest soils than in managed soils for most C-only substrates. TOC was negatively correlated with RQ (r = -0.65), indicating that the soils with higher organic matter content increased respiratory efficiency. The N addition in the assay in the absence of C amendment (i. e., only endogenous soil C present) had no effect on microbial respiration in any soil, indicating that these soils were not intrinsically N-limited, but substrate-dependent variation in Nr^tio within soil groups was observed. 展开更多
关键词 community-level physiological profiling N limitation oxygen biosensor system soil organic C soil respiration
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