Calculation Methods of Horizontal Ground Pressure on Shaft Wall in Deep Alluvium

Abstract

In order to give some advices on design of shaft wall, the reasonably calculation method of horizontal ground pressure on shaft wall in deep alluvium has been analyzed. 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 value of horizontal ground pressure calculated by the code for design of coal mine shaft and chamber of China, are not consistent with measured actual value seriously. 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 to 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. 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.