摘要
基于压力板仪与非饱和土直剪仪,针对脱湿与吸湿条件非饱和土的抗剪强度特性进行对比试验研究,探讨不同基质吸力、不同竖向压力下非饱和粉质黏土试样的抗剪强度特性。研究结果表明,抗剪强度与基质吸力成正比;基质吸力的变化对抗剪强度的影响主要表现在对黏聚力的影响,对摩擦角影响不大。进行脱湿与吸湿情况下相同含水率的抗剪强度对比,发现脱湿后试样的抗剪强度高于吸湿试样的抗剪强度;脱湿过程中试样的抗剪强度参数高于吸湿试样的抗剪强度参数。
By use of the pressure plate extractor and the direct shear apparatus for unsaturated soil,comparative tests on shear strength properties of unsaturated soil under moisture absorption and dehydration conditions were carried out.The shear strengths of unsaturated clay samples with different matric suctions and different vertical pressures were investigated.The test results show that the shear strength is directly proportional to the matric suction.The impact of the variation of the matric suction on the strength is mainly represented by the impact on the cohesion and little impact on the friction angle.Under the same moisture content,the shear strength and shear strength parameters of the specimens with dehydration are higher than those of the specimens with moisture absorption.
出处
《水利水电科技进展》
CSCD
北大核心
2011年第1期70-73,共4页
Advances in Science and Technology of Water Resources
关键词
非饱和土
脱湿
吸湿
抗剪强度
基质吸力
unsaturated soil
dehydration
moisture absorption
shear strength
matric suction
