Shear Strength Behavior of Two Landfill Clay Liners   总被引：1，自引：0，他引：1  

Jian Wenxing  Masashi Kamon  Toru Inui  Takeshi Katsumi 《中国地质大学学报(英文版)》2002,13(3)

Direct shear tests were conducted to obtain both the shear strength of compacted clay liners (CCLs) specimens and the interface shear strength between compacted clay liner and base soil. These experiments were conducted under the conditions of five different water contents. The experimental results show that shear strength of both CCLs and CCLs/base interface decreases with the increase in the water content of CCLs and base soil. In addition, the considerate concentration of NaCl in leachate has no deteriorating effect on the shear strength of liners. Triaxial shear tests were also conducted on clay liner specimens to obtain total and effective shear strength under a fast compression. The shear strength c‘=100 kPa for sand-bentonite, respectively. These results indicate that the compacted clay-bentonite shows normal consolidation, but that the compacted sand-bentonite exhibits over-consolidation.  相似文献   

K_o固结粘土各向异性不排水剪强度研究     

姜洪伟  赵锡宏 《岩土力学》1997,(2)

在三维各向异性弹塑性本构关系基础上，求解不排水条件和破坏条件，导出各种不同试验条件下K0团结粘土的各向异性不排水剪强度表达式。对常规超固结比定义下的不排水剪强度进行研究，将理论计算结果与试验结果进行比较，验证所提理论的合理性。  相似文献   

再论岩金矿化类型及成因   总被引：1，自引：0，他引：1  

关连绪  蒲银华 《黄金地质》1997,3(2):31-36

列举我国主要岩金矿床各种矿化类型实例。分析了复式矿化类型形成原因，拟定出矿化类型的表示法。按不同矿化阶段基本化类型的异同，将复式矿化类型分为同型迭代、异迭代和混型迭代３类；按不同矿化阶段矿化的相互构造关系，对各类分为平行迭代、交切迭代共１２个亚类。  相似文献   

Application of distinct element method in dynamic analysis of high rock slopes and blocky structures   总被引：9，自引：0，他引：9  

Zhang Chuhan  O.A. Pekau  Jin Feng  Wang Guanglun 《Soil Dynamics and Earthquake Engineering》1997,16(6):385-394

Comprehensive studies on the dynamic behaviours of a high rock slope of the Three Gorges shiplock and a blocky arch structure are performed using the distinct element method (DEM). Some additional functions have been incorporated into the current DEM code, including a scheme of non-uniform seismic input on the boundaries and an improved triangular mesh generator for deformable elements. Parameters from the field and laboratory tests of the project are used in the analysis of the shiplock slope. Comparisons between the DEM results and the field measurements under the excavation unloading process are made and the good agreement obtained demonstrates the effectiveness of the DEM for predicting the deformation process of the slope. The above examples of the high rock slope and the blocky arch demonstrate that the effects of different earthquake input, input mechanism and parameters on the dynamic response behaviours and collapse pattern of the systems are significant.  相似文献   

两种桩体材料复合地基性状的对比研究   总被引：5，自引：2，他引：5  

白晓红  解秀娟 《岩土力学》1997,18(3):75-81

通过生石灰搅拌桩和CFG桩的室内力学试验和复合地基现场载荷试验，结合数值分析结果，对这两种桩材的复合地基性状进行了分析研究，并对复合地基的设计计算提出一些新的观点。  相似文献   

大型滑坡滑带土结构强度再生特征及其机理探讨   总被引：9，自引：1，他引：9  

任光明  聂德新 《水文地质工程地质》1997,24(3):28-31,44

大型滑坡滑带土强度参数的正确选取，是作好滑坡稳定性评价和抗滑工程设计的重要环节。本文在现场调研和室内试验基础上，揭示了只要具有一定滑体厚度的滑带土，沿滑面具有强度再生现象，尤其在抗剪强度参数中显著存在一定量值的结构强度。讨论了结构强度再生的条件、变化规律及其再生机理，论证了滑带土的残余强度仅仅是一种瞬时效应，为滑坡滑面强度参数的选取与评价提供了重要的理论依据。  相似文献   

天然淡水冰单轴压缩强度及其温度和应变率效应     

沈乐天  赵士达  卢锡年  史毓香  陈淑霞 《冰川冻土》1990,(4)

本文报道了在不同温度和不同应变率下天然淡水冰单轴压缩强度的实验结果。指出S—l型柱状晶粒冰的压缩强度随着温度的降低而增加,极限压缩强度在应变率为10~(-4)S(-1)时有一个最大值。本实验的应变率范围是10~(-5)—10~0s~(-1)。10~(-1)—10~0s~(-1)的应变率范围是在冲击速度lm/s左右的实验条件下获得的,这个速度接近于浮冰与海上结构物相撞的情况。以本实验为基础,有希望发展对海冰的实验技术。  相似文献   

1988年澜沧—耿马大震序列剪切应力值随时间的变化与强余震预报     

王绍晋  秦嘉政  阚荣举  宋文  黄毓珍  胡克坚  张雪玲 《地震研究》1990,(1)

1988年11月6日澜沧——耿马大震后,在地震现场,利用澜沧地震台记录的2.5≤M_L≤4.9级地震,以清晰的直达P波初动半周期及时估算剪切应力强度,追踪它们随时间的调整变化,并直接用于对后续强余震的预测和序列发展趋势估计。  相似文献   

Effects of peat content,rainfall duration and aggregate size on soil crust strength   总被引：1，自引：0，他引：1  

E. I. Ekwue 《地球表面变化过程与地形》1991,16(6):485-498

The effect of peat on crust strength was investigated using ten soils with organic matter levels ranging from 1-50 to 18-23 per cent. As peat content increased, the crust strength reduced. This occurred in spite of the inability of peat to increase the stability of soil aggregates. Peat reduced crust strength by acting as a mulch on the soil surface, thereby reducing breakdown of soil aggregates. Peat also formed a source of weakness on the soil, reducing crust formation. Using a factorial experiment involving a further seven soils with different levels of peat treatment, exposed to four rainfall durations and with two aggregate sizes, crust strength was described in terms of the direct effects and the interactions of these factors. Most of the crust strength values reduced with increasing peat content. For each soil, crust strength increased significantly with increasing rainfall duration. Crust strength was greater for the smaller aggregate size. The most significant interactions affecting crust strength were between soil and aggregate size, rainfall duration and aggregate size, and soil and rainfall duration in that order. These interactions were used to describe the effect of organic matter in form of peat on crust strength. For each soil and aggregate size, polynomial relationships were established to relate crust strength to total kinetic energy of rainfall.  相似文献   

岩石强度的一种新判据     

李桂青  方建桥 《地球科学》1991,16(6):705-709

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