Based on the numerical computation of flac^3d , this paper analyzes the settlement and load-bearing properties of the soil core within the closed diaphragm, and discusses in detail of influence factors of the load-bearing character. The results indicate that the compressive deformation of the core within the closed diaphragm wall under the exterior loading action is occurred mostly from the bottom of soil core to the depth of 2/5 of the wall, and its numerical value varies along the depth in such form like power function. The reactive force distributed in the top soil core reaches the maximum at the middle part of soil core under the bearing platform, and then reduces a little at the midpoint of soil core edge, with the corner of soil core bears the minimum force. Under the same depth of the wall, the compressive deformation and the load sharing ratio of the soil core within the diaphragm wall, which in the ultimate loading condition, are increasing with the widening of section size of soil core; whereas they are decreasing with increasing of the depth of wall if under the same section size of soil core. The property of soil influences the load sharing ratio of soil core, and the well load-sharing ratio benefited from the good character of soil.%采用flae^3d数值计算的方法，对闭合型地下连续墙内土芯的沉降及承载特性进行分析和研究，并对其承载特性的影响因素进行了探讨。结果表明：外部荷载作用下闭合型地下连续墙内土芯的压缩变形主要发生在土芯底部以上2／5的墙身范围内，其数值大小沿深度方向呈近幂函数形态分布。墙内土芯顶部反力分布的总体特征是承台板下土芯的中点处最大，土芯边中点处次之，角点处最小。墙身深度一定时，极限荷载下闭合型地下连续墙内土芯压缩变形量及荷载分担比随土芯截面尺寸的增大而增大；土芯截面尺寸一定时，极限荷载下土芯压缩变形量及荷载分担比随墙身深度的增加而减小。土体性质的好坏直接影响土芯的荷载分担比，土性越好土芯荷载分担比越大，反之则土芯荷载分担比越小。
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