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依据库仑土压力理论假设,挡土墙土压力由墙后填土在极限平衡状态下出现滑动楔体产生,推导出考虑滑裂面上填土的黏聚力、墙土间黏聚力、黏性土表面出现张拉裂缝、条形荷载下的黏性土主动土压力计算式,并给出临界破裂角的显式解答。当墙后作用有连续均布荷载或不考虑黏性填土表面出现裂缝时,只需取条形荷载到墙顶的距离或计算的裂缝深度为0即可按相同的方法求解。研究表明,由于未考虑条形荷载对临界破裂角的影响,规范方法得到土压力值偏小。该公式适用范围广,尤其对于条形荷载作用墙后任意位置时均可应用,对实际工程中挡土墙的设计计算具有一定应用价值。
According to the theory of Coulomb’s earth pressure theory, the earth pressure of the retaining wall appears from the backfill of the wall in the state of limit equilibrium, and the sliding wedge body is generated. The cohesion of earth filling, Tension cracks appear on the surface of the soil, and the active earth pressure of the clay soil under the strip load is calculated, and an explicit solution of the critical fracture angle is given. When the wall behind the role of a continuous uniform load or do not consider the emergence of cracks on the surface of clay filling, simply take the strip load to the top of the wall or calculated crack depth of 0 can be solved in the same way. The results show that the soil pressure is small due to the influence of the bar load on the critical cracking angle. The formula is applicable to a wide range of applications. It can be applied to any position behind the bar load, and has certain application value to the design and calculation of the retaining wall in practical engineering.