摘要
选取四川省雅砻江锦屏二级水电站地下围岩绿泥石片岩,分别用饱和NaCl溶液和蒸馏水进行饱和,利用RMT试验机和MTS试验机进行单轴和普通三轴的室内强度试验,分别测定绿泥石片岩在两种饱和状态和干燥状态下的强度指标。对比绿泥石片岩力学参数的变化,通过对岩石双电层进行微观机理分析,得出绿泥石片岩遇水后强度有显著的降低,表现出明显的遇水软化特性;软化的主要原因是岩石周围双电层的影响,且双电层厚度越厚,岩石强度降低越多;双电层厚度越薄,岩石强度降低越少。
The chlorite schist sample from the Jingping II Hhydropower Prjoect on Yalong River was saturated by the saturated NaCI solution and the distilled water, its uniaxial and conventional triaxial test was done in the RMT and MTS test machine, in which the strength index of saturated and dry state in different solutions was obtained. Compared with its mechanical param- eters＇ change and analyzed its micro mechanism of electric double layer, results showed that the strength of chlorite schist under water was decreased obviously, which showed its softening under water because of the influence of its electric double layer, the more the thickness of electric double layer was, the more the decrease of the chlorite sehist＇s strength was, vice versa.
出处
《土工基础》
2011年第1期45-48,69,共5页
Soil Engineering and Foundation
关键词
绿泥石片岩
强度试验
饱和NaCl溶液
饱和
双电层
chlorite schist, strength test, saturated NaCl solution, saturated, electric double layer
