考虑位移非线性影响的挡土墙土压力计算模型研究

根据横向受荷桩的P y曲线方程,建立了可考虑挡土墙位移非线性影响的土压力计算模型。对地基土的水平基床系数的比例系数m,在横向受荷桩与挡土墙分析中的差异进行了研究,进而提出了计算模型的主要参数———地基土的初始水平基床系数的比例系数m0的确定方法,即在没有试验资料的情况下,m0可取《建筑桩基技术规范》中m较大值的一半。对计算模型进行的试验验证表明:该模型的土压力计算值较现行规范方法计算值更接近实测值。

Study of calculation model of the earth pressure for retaining wall considering the nonlinear influence of the displacement

A new calculation model of the earth pressure for retaining wall was established based on the P-y curve equation of the horizontal loaded piles. The nonlinear influence of the retaining wall's displacement on the earth pressure can be considered in the model. The differences of scale coefficient "m" of horizontal foundation modulus in analysis for the horizontal loaded piles and retaining wall were studied. Then,the method to determine the model's main parameter-the scale coefficient "m_0" of initial horizontal foundation modulus was put forward.Without experimental data,authors select the "m_0" to equal one half of larger "m" in "Technical Code for Building Pile Foundation".The model was confirmed by experiments,and the results show that the earth pressure calculated by the model is more approach the actual value than calculated by the code.