含水量变化对红粘土变形和强度特性的影响研究  

Effects of water content variation on the deformation and shear strength of laterite clay

作　　者：王英辉[1] 张全秀[1] 田鹏程[1] 梁书奇[1] 

机构地区：[1]河北建设勘察研究院有限公司,石家庄050031

出　　处：《工程勘察》2009年第7期10-13,共4页Geotechnical Investigation & Surveying

摘　　要：对击实后的红粘土土样在饱和前、饱和后进行了三轴剪切试验和无侧限抗压强度试验,研究其抗剪强度特征的变化规律。针对原状土样和重塑土样在脱湿或加湿过程中无侧限抗压强度的变化进行了研究。研究表明,在脱湿过程中,土体的抗剪强度逐渐增大,而且原状土的应力应变关系曲线一般呈应变软化的特点,而重塑土的应力应变关系曲线则一般呈现硬化的特点;在加湿过程中,原状土无侧限抗压强度峰值并不明显。分析表明,脱湿过程或加湿过程中土样强度随含水率的变化是显著的。The shear characteristics of laterite samples （unsaturated and saturated） are tested by axial shear apparatus and unconfined compression tests. The unconfined compression strength of the undisturbed and remolded specimens are studied in the conditions of the dehydration or adding moisture content. The studies show that the shear strength from the axial shear tests increases with the dehydration of laterite clay. The stress-strain curves for the undisturbed samples are of the softening characteristics, but the stress-strain curves for the remolded samples are of the hardening characteristics. When the moisture content increases, there are no peak values in the stress-strain curves for the undisturbed samples. It could be seen that the effects of the dehydration or adding moisture content on laterite clay are obvious

关 键 词：红粘土 含水量 变形 脱湿 加湿 工程性质 

分 类 号：TU473[建筑科学—结构工程]