粘性土初始水力坡度试验研究  

Experimental study on initial hydraulic gradient in clayey soil

作　　者：刘丰敏[1,2] 杨斌[1,2] 薛丽影[1,2] 张邦芾 

机构地区：[1]中国建筑科学研究院地基基础研究所,北京100013 [2]建筑安全与环境国家重点实验室,北京100013

出　　处：《工程勘察》2016年第6期5-10,共6页Geotechnical Investigation & Surveying

基　　金：国家科技支撑计划(2012BAJ01B01)

摘　　要：粘性土中可能存在的初始水力坡度现象会影响其固结特性。通过GDS高级固结仪系统开展了不同塑性指数的粘性土和粉土在不同总固结压力和孔压条件时的孔压消散试验,研究结果表明:粘性土中存在初始水力坡度现象,土的塑性指数越高初始水力坡度也越大;孔压对初始水力坡度值有显著影响,孔压越小初始水力坡度越大;孔压相同时初始水力坡度随有效应力的增大无明显变化。The consolidation behavior may be affected by the initial hydraulic gradient in clayey soil. Pore pressure dissipation tests of clayey and silty soil samples with different plasticity index are performed using GDS advanced consolidation test system under different consolidation pressure and pore pressure. It is found that initial hydraulic gradient exists in clayed soil,and the initial hydraulic gradient is high if the plasticity index is high of cohesive soil,the pore water pressure effects the initial hydraulic gradient value significantly,and the initial hydraulic gradient value increases with the pore pressure decrease,the initial hydraulic gradient has no significant change with the increase of the effective stress under the same pore pressure.

关 键 词：粘性土 初始水力坡度 塑性指数 孔压 

分 类 号：TU411[建筑科学—岩土工程]