侧限条件下非饱和土增湿压缩试验研究

Research on compression test of unsaturated soil with humidifying under lateral restraint

采动区建筑物局部地基增湿可减缓地表曲率变形,为研究非饱和土体增湿过程中的压缩变形规律,对侧限条件下不同初始含水量、荷载作用和渗水点位置等影响土体增湿压缩变形的因素进行了室内试验研究.试验结果表明,施加载荷和渗水点位置对土体渗水量和渗水速度有影响.在荷载作用下,非饱和土体增湿过程的压缩量与土体初始含水率、增湿时间、渗水量以及渗水点位置有密切关系.初始含水率越大土体增湿变形开始的时间越短;增湿时间越长,渗水量越多,施加载荷越大,土体的最终变形量越大;渗水点越接近载荷施加面,增湿变形的效果越显著.增湿变形具有3个阶段和可控性,研究结果对消除采动地表曲率变形对建筑物影响和建筑物结构纠偏等具有理论和实践指导意义.

To investigate the deformation features of unsaturated soil under compression with humidifying,the experiment research on the related factors of soil compression deformation has been finished under a lateral restraint.These related factors are initial water content,loading and the seePage point.The test results show that the unsaturated soil humidifying compression has a close relationship with initial water content,humidifying time,seePage value and seePage point under the action of load.The higher the initial water content is,the shorter the time of soil deformation happening is; the seePage value increased as humidifying time growth; the larger the load acting on the soil is,the greater the deformation of soil is.There are three stages in the hu midifying process and these stages can be controlled.The research results are useful to eliminate the curvature deformation effects of ground surface in mining area and to balance the force action of soil and foundation,as the research has theoretical and practical significance in mine.