This paper points out the disagreement of boundary conditions that generate force discontinuity in the linear spring damping contact model by analyzing the contact modulation of the clearance joint.

分析了含间隙运动副副元素的碰撞分离过程，指出线性弹簧阻尼模型不能满足接触边界条件并产生力突变；

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The relation of real contact area with load is linear, which also agrees with G-W model qualitatively.

真实接触面积与载荷存在线性关系，与G-W模型定性地一致。

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In the analysis, the soil body of close field is simulated with the modified Cambridge Model on the contact surface between the pile and soil and the non linear analysis for the far field soil body.

分析中用修正剑桥模型进行近域土体的模拟，对桩土接触面及远域土体进行非线性分析。

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