地下构筑物通过改变地下水渗流及土体变形影响地面沉降。为了在地面沉降模拟中考虑地下连续墙的作用，文章开
展了土—混凝土接触面剪切试验，分析了土体组成与含水率对接触面摩擦角及黏聚力的影响，并将土—混凝土接触面本构模型与耦合地面沉降模型相结合模拟地面沉降过程。分析结果表明，接触面的剪应力—位移曲线呈应变硬化特征，符合双曲线变化规律；黏粒含量和含水率对接触面的抗剪强度参数有明显影响；随挡板宽度和插入深度增大，其阻水效应增强，导致最大沉降量增加；受挡板对水流和土体位移阻碍的综合作用，随挡板与抽水井间距离减小，地面沉降的最大值呈先增加后减小的变化特征。

Underground structures affect the land subsidence by changing the groundwater seepage and soil deformation. Based on the direct shear test of the soil-concrete interface, this study analyzes the influence of soil composition and moisture content on the interface friction angle and cohesion. Combined with the constitutive model of the interface between the soil and the concrete, the hydraulic and mechanical coupled model was employed to simulate the land subsidence. The results show that the shear stressdisplacement curve of the interface exhibits strain hardening characteristics and conforms to a hyperbolic curve. The clay particle contents and moisture contents have clear effects on the interface shear strength parameters. With the width and insertion depth of the baffle increasing，the water-blocking effect enhances, inducing an increase in the maximum subsidence. Baffles in soils can block water flow and hinder the soil displacement at the same time, thus the maximum subsidence first increases and then
decreases with the increasing distance between the baffle and the pumping well.