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经大量研究,发现水是影响加筋土结构力学特性和破坏机理的重要因素。基于多孔介质的有效应力原理,依据流固耦合理论,建立了降雨条件下台阶式加筋土挡墙结构的流固耦合数值计算模型。应用有限差分软件FLAC3D,仿真模拟了墙体内的孔隙水压力、流速的分布和塑性区发展趋势等。结果表明,在强降雨条件下,由于墙体内孔隙水压力的变化导致土体的沉降;有效应力的改变影响了加筋土体的抗剪强度,从而导致墙体的整体稳定性大幅度下降。因此,在加筋土挡墙的设计及施工中,渗流场和应力场的耦合不容忽视。
After extensive research, it is found that water is an important factor that affects the mechanical properties and failure mechanism of reinforced soil. Based on the principle of effective stress in porous media, a numerical model of fluid-solid coupling of stepped reinforced earth retaining wall under rainfall is established based on the fluid-solid coupling theory. The finite difference software FLAC3D is used to simulate the pore water pressure, the distribution of flow velocity and the development trend of plastic zone in the wall. The results show that under strong rainfall conditions, the settlement of soil is caused by the change of pore water pressure in the wall. The change of effective stress affects the shear strength of the reinforced soil, resulting in a significant decrease of the overall stability of the wall . Therefore, in the design and construction of reinforced earth retaining wall, the coupling of seepage field and stress field can not be ignored.