深厚表土中立井井壁水平地压力计算探讨

Calculation methods of horizontal ground pressure on shaft wall in deep alluvium

基于石集立井实测水平地压力,对比分析了当前常见的几种水平地压力计算理论的准确性与适用性。分析表明,我国立井井筒设计规范建议的计算水平地压力的重液公式的计算结果与实测值误差很大,其计算均值是实测均值的100倍以上。以浅部土力学思路建立的水平地压力具有随着深度的增加而增大的特征。而深厚表土中的水平地压力分布规律可能与此不同,其压力值最终趋于稳定,不会无限制的增大。由于固结时间、应力水平、应力路径的不同,深厚表土层的物理力学性质与浅部土体具有显著差异。建议深入开展深土力学研究,基于更多的测试与研究工作来确定深厚表土中水平地压力的大小与分布规律。

Based on the measured value of horizontal ground pressure of Shi-Ji vertical shaft, the veracity and applicability of major calculation methods of horizontal ground pressure on shaft wall in deep alluvium has been studied. It is found that the result of heavy liquid method, which recommended by the code for design of coal mine shaft and chamber of China, is not consistent with the value of measured value seriously,which is larger than 100 times of the measured value. The horizontal ground pressure, deduced from the mechanics of shallow soil, would increase as the depth of shaft wall increases. While the horizontal ground pressure deduced from the mechanics of deep soil,may not infinite increase with depth of shaft wall increased,which would arrived at a fixed value. Due ro the difference of consolidation time, stress level and stress path,the physical and mechanical properties of deep alluvium are remarkably different with that of shallow soil. Therefore,it is imperative to study the mechanics of deep soil, and more tests and theoretical study should be carried out to analyze the horizontal ground pressure in deep alluvium.