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重力式挡土墙主动土压力的计算,目前普遍采用库伦理论。众所周知,库伦理论是假定墙后填料均匀一致、破裂面为一平面、墙身是刚体,在此前提下按静力平衡原理,建立了土压力计算公式。这些假定与实际情况不尽相符,显然是近似解。用于土压力计算的一些基本参数,如墙后填科的内摩擦角φ和外摩擦角σ等,实际上难以精确选定,致使计算结果差异较大。因此,在工程上按库伦公式计算土压力时,有必要加以简化。
Gravity retaining wall active earth pressure calculation, the current universal Coulomb theory. As we all know, Coulomb theory assumes that the wall packing is uniform, the rupture surface is a plane, and the wall body is a rigid body. Based on the principle of static balance, the earth pressure formula is established. These assumptions and the actual situation is not consistent, apparently approximate solution. Some basic parameters used for earth pressure calculation, such as the internal friction angle φ and the external friction angle σ of the wall backfilling section, are actually difficult to be accurately selected, resulting in large differences in the calculated results. Therefore, it is necessary to simplify the calculation of earth pressure according to the formula of Coulomb in engineering.