不同土性下L型挡土墙土压力研究

运用有限元法对L型挡土墙在不同土性的填土情况下分层逐级填筑进行了模拟,重点分析了填料强度对土压力的影响、挡墙基底应力分布情况和材料刚度对墙体受力的影响规律，结果表明:当砂性填土φ＞30°，墙背水平侧压力将趋于相等； 粘性填土c＞20 kPa时，墙背水平侧压力不再受φ值影响而趋于相等；无论是砂土还是粘土，当填土材料强度达到一定程度时，其挡墙外部检算安全系数将在一个稳定值附近波动，墙背土体未达到极限平衡状态；挡墙基底应力分布呈“马鞍形”，基底平均应力［σ］＜140 kPa；地基刚度对土压力影响比填料小。

Study on Soil Pressure of L-shaped Retaining Wall under Different Soil Properties

The layered stage filling of L-shaped retaining wall by fill with different soil properties is simulated with FEM, which lays the focus on analysis of the laws of the fill strength affecting the soil pressure as well as of both the stress distribution at the retaining wall foundation and the material stiffness affecting the force on the wall body. The results show that where sandy fill φ 〉 30°, the lateral pressure against the back of retaining wall will tend to be equel; where cohesive fill c 〉 20kPa, the pressure will not be affected by ~ value and tend to be equel; either sandy soil or cohesive soil, when the fill strength reach certain extent, the safety factor for calculation outside the retaining wall will fluctuate around certain stable valve and the soil mass of the wall back does not reach a state of ultimate equilibrium; the stress distribution at the retaining wall foundation will present ＂saddle＂ shape with the average foundation stress δ] 〈 140kPa; the influence of the foundation stiffness on soil pressure is less than that of the fill.