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基于摩尔-库伦强度理论,提出通过比较平均附加竖向应力来评估溶洞顶板安全性的方法,即在施工阶段对局部桩基施加竖向荷载,使得溶洞顶板一定范围内产生的平均附加竖向应力大于等于建筑物建成后该范围内产生的平均附加竖向应力,得到需要施加的单位面积竖向荷载为建筑物正常状态下平均重量的倍数,据此评估溶洞顶板的安全性。文中给出了单位面积荷载倍数的定义,再通过计算和回归分析得到不同因素对其影响程度。
Based on the Mohr-Coulomb strength theory, a method to evaluate the roof security of caves by comparing the average additional vertical stress is proposed. That is, the vertical load is applied to the local pile during the construction so as to make the average additional vertical stress Is greater than or equal to the average additional vertical stress in the area after the completion of the building. The vertical load per unit area required to be applied is a multiple of the average weight of the building under normal conditions, and the safety of the roof of the cave is evaluated accordingly. In this paper, the definition of load multiplier per unit area is given, and then the influence of different factors is obtained through calculation and regression analysis.