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

Abstract

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.

Keywords

• foundation engineering; reinforced soil retaining wall; displacement partition theory; numerical simulation; reinforcement deployment form; seismic performance