软粘土地基中齿坎抗滑效应的研究

通过位于软弱地基中的无齿挡墙和齿坎式挡土结构物的现场抗滑试验，研究了齿坎对挡土结构物所起的抗滑作用，还用非线性有限元方法对现场试验成果进行分析，通过研究得出结论：尽管齿坎较短，但对挡土结构物的抗滑作用颇大，在试验齿长范围内，抗滑力与齿长成正比，当挡土结构物处于极限破坏状态时，齿前土压力达到‘被动’土压力值，而齿后主动土压力甚小，有限元分析与现场试验成果具有很好的一致性，最后用有限单元法研究了齿坎的临界长度。

STUDY ON EFFECT OF KEY WALL IN THE SOFT CLAY GROUND ON SLIDING RESISTANCE

By field sliding resistance test of the retaining structure both with and without key wall in the soft clay ground, the effect of key wall on the retaining structure is studied. The field test results are analyzed by means of non-linear FEM. The conclusions are as follows. The effect of the key wall on sliding resistance is quite great in spite of shorter key wall length, and the sliding resistance is in direct proportion to the key wall length in the range of testing key wall length. The earth pressure in front of the key wall reaches the passive pressure and the earth pressure behind the key wall is close to zero while the retaining structure is in limit equilibrium condition. The FEM predictions are in good agreement with the experimental results. Finally, the critical length of the key wall is studied by means of FEM.