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考虑土体分层性质,假定开挖槽段附近各土层厚度分布均匀且土层分界面垂直于槽面,以经典二维楔形滑块体模型为研究对象,提出了地下连续墙泥浆护壁稳定性评价的水平条分法,建立了满足条块力平衡的3M方程评价模型和同时满足力平衡和力矩平衡的4M方程评价模型,提出了求解方法,并验证了3M方程模型的有效性和条分法提出的必要性。将3M评价模型应用于武汉市某超深基坑成槽开挖坍塌的槽段稳定性分析,总结了临界角度和安全系数随地下水位、地表超载、泥浆高差、及泥浆重度的变化规律。最后用定义的水平条间力与竖向条间力的比值讨论了不同参数取值下水平条间力的变化规律。
Considering the stratification of soil, assuming that the thickness of each soil layer near the trenches is uniform and the interface of soil layer is perpendicular to the trough surface, the classical two-dimensional wedge-slider body model is taken as research object, The evaluation of the level of the bar, established to meet the block force balance 3M equation evaluation model and at the same time to meet the balance of forces and torque balance 4M equation evaluation model, the solution method is proposed, and verify the validity of the 3M equation model and Article Sub-law proposed the necessity. The application of 3M evaluation model to the stability analysis of the trough section of a super deep foundation pit in trough during excavation in Wuhan City is summarized. The variation rules of critical angle and safety factor with groundwater level, surface overloading, mud height difference and mud weight are summarized. Finally, the relationship between the horizontal force and horizontal force under different parameters is discussed by the ratio between the horizontal force and the vertical force.