立井井壁竖向附加力的反演统计分析

立井井壁单位外表面积竖向附加力的数值较难准确确定,相关规范中仅注明了可根据具体条件按试验数据或经验选取。本文基于16个已破裂立井案例,通过破裂断面上的强度关系反演推算得到附加力的有效均值。计算结果表明:同一煤矿中不同立井的附加力值较为接近,不同煤矿的附加力值相差较大。预制混凝土结构与土体的接触不够紧密,故预制井壁的竖向附加力值较小。附加力的大小并不取决于立井的深度,而与地质条件有关。影响竖向附加力大小的因素众多,仅依照地质资料要准确确定某一矿井的竖向附加力取值是非常困难的。分析表明:若新建矿井的地质条件与本文反演计算中的矿井类似或相近,其竖向附加力可选相近矿井的相应值做参考。

Inversion statistical analysis of vertical additive pressure at shaft wall

It is very difficult to confirm the value of vertical additive pressure of unit surface area of shaft wall, which could be got by test or experience suggested by correlative code. Based on 16 ruptured shaft walls, the value of vertical additive pressure has been inversion statistical analyzed in this article. It is found that the value of vertical additive pressure of different shaft walls in a same coal mine are quite closed, while which has distinguishable difference at different coal mine. Due to loose contact between soil and precast concrete shaft wall, the value of vertical additive pressure of precast concrete shaft wall is very small. The value of vertical additive pressure is not depended on the depth of shaft wall, which depend on the engineering geology of shaft wall. While the value of vertical additive pressure is influenced by many factors, which could hardly be accurately evaluated only by engineering geology. It is indicated that if the conditions of shaft wall to be constructed is similar to the cases analyzed in this article, which value of vertical additive pressure could be quoted and referenced corresponding.