察尔汗盐湖岩盐路基应力作用下溶蚀特性试验研究

为研究察尔汗盐湖岩盐路基在应力作用下的溶蚀特性,对察尔汗盐湖岩盐试样通过控制围压、轴向应变和溶蚀时间的方法,并采用位移加载方式,进行单轴和三轴压缩条件下的岩盐应力-溶蚀耦合效应的力学试验,得出了岩盐在应力作用下的溶蚀特性:(1)随着围压的增大,岩盐溶蚀质量呈现逐渐减小的趋势,即在岩盐收到较大侧向限制时,岩盐在上部荷载作用下产生了较小的塑性变形,减少了水溶液与岩盐的接触面积,从而使溶蚀速率减缓;(2)荷载作用下,岩体所产生的裂缝加大了水溶液与岩盐颗粒的接触面积,即在处理岩盐地基时需考虑减小岩盐地基岩体的孔隙。

Experimental Study on Corrosion Characteristics of Rock Salt Subgrade under Stress in Chaerhan Salt Lake

In order to study the corrosion characteristics of rock salt subgrade under stress in Chaerhan salt lake,rock salt samples are mechanically tested by controlling the confining pressure,axial stain and the time of corrosion under displacement loading to obtain the coupling effect of stress-corrosion on rock salt with uniaxial and triaxial compression. The corrosion characteristics of rock salt under stress are resulted as follows :( 1) the rock salt corrosion mass tends to decrease with the increase of confining pressure. That is when rock salt receives larger lateral restriction,it generates less plastic deformation under upper load and,thus,the area where water contracts with rock salt is reduced and the corrosion speed is slowed down.( 2) the rock mass cracks under load increases the contact area with water and rock salt particles,therefore,it shall be considered to reduce the porosity of rock mass in rock salt foundation during rock salt foundation processing.