筋材布设方式对加筋土挡墙动力响应的影响

针对目前加筋土挡墙设计和施工中筋材布设方式大多为等长形的问题，提出一种倒梯形的筋材布设方式，并基于挡墙位移分区理论和有限差分Flac^3D数值模拟，建立加筋土挡墙三维分析模型，探讨不同峰值加速度下3种加筋土挡墙对位移、水平土压力、筋材拉应力及潜在破裂面的影响。结果表明，随峰值加速度增大，挡墙位移逐渐增大，同一荷载作用下，改变筋材布设方式，侧向水平位移减少9.3%,竖向沉降减少5.3%;3种形式挡墙水平土压力相差不大，最大水平土压力分布在挡墙的中下部；筋材拉应力随峰值加速度的增大，沿墙高从单峰型转化为双峰型分布，最大值位于挡墙中下部；潜在破裂面填土区破裂带的形状与筋材的布设方式有关。所提出的倒梯形筋材布设方式对加筋土挡墙的抗震效果更好，可为施工设计中加筋土挡墙筋材布设提供参考。

Effect of reinforcement layout on dynamic response of reinforced soil retaining wall

Aiming at the current design and construction of reinforced earth retaining wall in which most of the reinforcement laying methods are of equal length, an inverted trapezoidal reinforcement laying method was proposed. Based on the theory of retaining wall displacement zoning and finite-difference Flac3D numerical simulation, a three-dimensional analytical model of reinforced earth retaining wall was established to explore the effects of the three types of reinforced earth retaining wall on the displacements, horizontal earth pressures, reinforcement tensile stresses, and the potential rupture surfaces under different peak accelerations. The results show that with the increase of peak acceleration, the displacement of the retaining wall gradually increases, and under the same load, changing the layout of reinforcement material the lateral horizontal displacement decreases by 9 .3%, and the vertical settlement decreases by 5 .3%; The horizontal earth pressure of the three forms of retaining wall does not differ much, and the maximum horizontal earth pressure is located in the middle and lower part of the retaining wall; The tensile stress of the reinforcement material transforms from a single-peak type to a bi-peak type along the height of the wall as peak acceleration increases, with the maximum value located in the middle and lower part of the retaining wall; The shape of rupture zone of potential fracture surface filling area is related to the shape of rupture zone of potential fracture surface filling area. The maximum value is located in the middle and lower part of the retaining wall; The shape of the rupture zone in the filling area of the potential rupture surface is related to the deployment method of the reinforcement material. The inverted trapezoidal reinforcement layout has better seismic effect on reinforced soil retaining wall, which provides reference for reinforcement layout of reinforced soil retaining wall in construction design.