采动区刚性墙体侧土压力试验研究  

Experiment study of lateral earth pressure on rigid wall in mining area

作　　者：窦国涛[1,2] 夏军武[1,2] 杨远征[1] 张海威[1] 邱浩[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室力学与建筑工程学院,江苏徐州221008 [2]江苏省建筑节能与建造技术协同创新中心,江苏徐州221116

出　　处：《中国矿业大学学报》2017年第1期215-221,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51274192);江苏省土木工程环境灾变与结构可靠性重点实验室开放基金项目(JSKL2014K12);江苏省普通高校研究生科研创新计划项目(KYLX-1392)

摘　　要：当刚性墙体位于采动区下沉盆地压缩区不同位置时,墙后土体存在两种不同的压缩变形区:一种是递增压缩变形区,离墙体越近,土体压缩变形越大;另一种是递减压缩变形区,离墙体越近,土体压缩变形越小.基于此,采用松砂和密砂填料,进行了模型试验,研究了两种压缩变形区刚性墙体侧土压力的分布规律.研究结果表明:当墙后砂土为递增压缩变形区,同一深度位置处,墙体的侧土压力随土体总压缩变形的增大而增大;相同压缩变形值时,土压力随着土体深度的增大总体趋势增大,局部会有减小;墙体下部区域土压力明显大于上部区域;墙体所受侧土压力合力也随土体总压缩变形的增大而增大.当墙后砂土为递减压缩变形区,墙体侧土压力及合力变化规律和前者一致,但侧土压力分布曲面较为平缓,侧土压力合力值较小.When the rigid wall is located in different areas of the compression zone of the sub- sidence basin in mining areas, there are two different compressive deformation zones in the soil behind the wall. one is the incremental compressive deformation zone, where the closer to the wall, the bigger the compressive deformation; the other is the decreasing compressive deforma- tion zone, where the closer to the wall, the smaller the compressive deformation. On this ba- sis, the loose and dense sand fillers were used to carry out the model experiment, in which the distribution laws of the lateral earth pressure on the rigid wall of the two compressive deforma- tion zones were studied. The results show that when the compressive deformation zone in the sandy soil behind the wall is incremental, the lateral earth pressure at the same depth of the wall arises with the increase of the total compressive deformation of the soil; With equal com- pressive deformation, except in some small parts, the earth pressure generally grows with the increase of the soil depth. The earth pressure in the lower part of the wall is obviously largerthan that in the upper part. The resultant lateral earth pressure of the wall also increases with the increase of the total compressive deformation of the soil. When the compressive deforma- tion zone in the sandy soil behind the wall is the decreasing one. the changing rules of the later- al earth pressure and the resultant lateral earth pressure are the same with the former case, yet the distribution surface of the lateral earth pressure is gentler and the resultant pressure value is smaller.

关 键 词：下沉盆地 压缩区 刚性墙体 侧土压力 砂土 

分 类 号：TD228[矿业工程—矿井建设]