The dispersibility as well as seepage distortion and salt transference under long - term seepage condition of soil samples obtained from the clay core wall in xijiao and sanping reservoirs were studied by physical and chemical properties of soil and composition of clay mineral and the tests for identification of dispersive clay soils which included double - hydrometer test , pinhole test , crumb test , tests to defermine salt content of pore water and percentage of exchangeable sodium 摘要应用碎块、针孔、双比重计、孔隙水可溶盐和交换性钠百分比等五种试验方法，结合物理化学性质和矿物成分分析，对西郊、三坪两水库大坝心墙土样进行了多种方案的分散性试验及长期渗流条件下的渗透变形试验和盐分运移试验。
( 6 ) conclusion was obtained by the analyzing the mechanics environment and the stability of the lanslide on the right bank after the dam built : the value of the rock mass stress increased and the tensile stress region obviously reduced , the direction of the principal stress was unchangeable the dam and the landslide were stable under the dangerous condition ( the reservoir and at the same time the earthquake was viii ) , but when the water lever suddenly fell and did not think of other force , safe factor evidently reduced , the dam and the landslide will be destroyed under the most dangerous condition ( the water lever suddenly fell and at the same time the earthquake was vi ) ; the stability of the landslide will be destroyed by the horizontal thrust under the most dangerous condition or ; the physical and mechanical parameter will be reduced due to long period filter , the landslide will be destroyed too ( 6 )建坝工程荷载条件下河谷岩体力学环境分析及右岸古滑坡体的稳定问题分析得出：建坝后河谷的岩体应力量值明显增高，同时左岸的张应力区的范围及量值明显减小，主应力的方向依然与模型的底边界垂直；大坝建成后逐渐蓄水阶段以及同时考虑本区最强地震力的作用等各种不同的工况条件时，滑坡体及坝体总体上仍处于稳定状态；水位骤降时，在未考虑其他外力作用的情况时，滑体的安全系数将显著降低。若考虑水位骤降及本区最大地震力的共同作用，坝体将在滑坡体下滑推力的作用下产生破坏；建坝后水平推力对右岸古滑坡体稳定性的影响分析可以看出，在最危险的工况条件下，坝体及滑坡体也将处于临界状态；在长期渗透变形的作用下，由于滑带的物理力学参数的降低而有可能导致坝体失稳破坏。
