采动区刚性墙体侧土压力试验研究

发布时间：2019-02-15 01:45

【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.
[Abstract]:When the rigid wall is located in different positions of the subsidence basin compression zone in mining area, there are two different compression deformation zones behind the wall: one is incremental compression deformation zone, the closer to the wall, the greater the soil compression deformation; The other is the decreasing compression deformation zone, the closer to the wall, the smaller the soil compression deformation. Based on this, model tests were carried out with loose sand and dense sand fillers, and the distribution of lateral earth pressure of rigid wall in two compression deformation zones was studied. The results show that the lateral earth pressure of the wall increases with the increase of the total compressive deformation of the soil at the same depth when the sand behind the wall is an incremental compression deformation zone. With the same compression deformation value, the soil pressure increases with the increase of soil depth, and the local pressure decreases, and the earth pressure in the lower part of the wall is obviously larger than that in the upper part. The combined force of lateral earth pressure on the wall increases with the increase of the total compressive deformation of the soil. When the sand behind the wall is an area of decreasing compression and deformation, the variation law of the lateral earth pressure and the resultant force of the wall are the same as the former, but the surface of the lateral earth pressure distribution is relatively smooth, and the resultant value of the lateral soil pressure is smaller.
【作者单位】：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;江苏省建筑节能与建造技术协同创新中心;
【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)
【分类号】：TD32

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