加筋土挡墙墙背土压力分布规律研究

综合考虑了拉筋垂直层间距与拉筋的抗拉强度的影响,利用微元法提出了加筋土挡墙墙背土压力计算模型,进而得到墙背的土压力强度和合力的理论公式。研究结果表明:文中提出的加筋土挡墙墙背侧向土压力强度公式模型较好地反映了土压力随墙高呈非线性分布的规律;土压力理论值随拉筋竖向间距的增加而增加,随拉筋拉力的增加而减小;主动破裂角随拉筋拉力的增加而增大,随拉筋垂直间距的增加而减小,且加筋后的破裂角比未加筋的大;土压力理论值比变系数法小且大于实测值。

Study of the Distribution of Lateral Soil Pressures of Reinforced Earth Retaining Walls

By means of the method of differential element analysis,a lateral soil pressure model for the reinforcedearth retaining wall is put forward in the paper, with the effects of the vertical spacing＇and the tensile force of the reinforcement taken into account, upon the basis of which the theoretical formulae of the unit and the resultant active soil pressures are obtained. Analytical re- sults show that the proposed formulae properly interpret the nonlinear distribution of the lateral soil pressures along the wall- height. With the increase of the vertical spacing of the reinforcement or the decrease of the tensile force of the reinforcement, the active lateral soil pressures will increase or decrease accordingly. The active angle of rupture, which will increase with the increase of the tensile force of the reinforcement, will decrease with increase of the vertical spacing of the reinforcement, and the active angle of rupture in the reinforced earth retaining wall is bigger than that in the gravity retaining wall. The theoretical value of earth pressure is bigger than the tested value, but smaller than that obtained by means of the variation coefficient method.