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首页> 外文会议>Proceedings of the 2nd international symposium on Asia urban geoengineering >On Methods of Estimating the Base Stability of Excavations in Clay
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On Methods of Estimating the Base Stability of Excavations in Clay

机译：粘土基坑基础稳定性的估算方法

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摘要

This study investigated three conventional methods in estimating stability of wide excavations in clay, including the load factor method, the strength factor method, and the slip circle method. Estimates of the factor of safety and required wall embedded depth were compared with those from the finite element method (FEM) using strength reduction technique, which were herein treated as the standard values. Results showed that wall friction had a pronounced effect on the factors of safety by the load factor method and the strength factor method but the slip circle method. For constant s_u/σ_v' (normalized undrained shear strength) case, the H_p/H_e (wall embedded depth to excavation depth) ratios determined by the three hand-calculation methods were smaller than those by the FEM as N_b (the stability number) < 7.0 but larger as N_b ≥ 7.0. For constant s_u (undrained shear strength) case, as increasing s_u, the H_p/H_e ratios determined by the load factor method were illogical. Estimates by the strength factor method and the slip circle method were larger than those by the FEM as N_b < 4.5 but smaller as N_b > 4.5.
机译：这项研究研究了三种评估黏土宽基坑稳定性的常规方法，包括荷载系数法，强度系数法和滑移圆弧法。将安全系数和所需壁厚的估计值与使用强度折减技术的有限元方法（FEM）的估计值进行了比较，此处将其作为标准值。结果表明，采用载荷系数法，强度系数法，滑移圆弧法，墙面摩擦对安全系数影响显着。对于恒定的s_u /σ_v'（归一化不排水抗剪强度）情况，通过三种人工计算方法确定的H_p / H_e（墙埋入深度与开挖深度）之比小于FEM，因为N_b（稳定性数）< 7.0，但大于N_b≥7.0。对于恒定的s_u（不排水剪切强度）情况，随着s_u的增加，通过载荷系数法确定的H_p / H_e比是不合逻辑的。当N_b <4.5时，强度因子法和滑移圆环法的估计值比FEM大，而当N_b> 4.5时，估计值较小。

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