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传统的地基临界荷载计算公式只适用于地基超载为对称的情况,无法直接应用于非对称超载情况。沿用传统地基临界荷载推导方法,推导并计算了只有一边有超载条件下的地基附加应力和临界荷载。计算分析结果表明:相对于无超载情况,单边超载使地基附加应力的影响深度和宽度均增大,且向有超载一侧偏移的趋势;在单边超载和地基临界荷载的作用下,地基的塑性区不再是对称的,而是只出现在和超载相对的一侧。单边超载对地基临界荷载的影响有限,基本可以忽略不计,这也定量地验证了规范(GB50007)关于非对称超载条件下地基临界荷载规定的合理性。
The traditional formula for calculating the critical load of foundation is only applicable to the cases where the overburden of the foundation is symmetrical and can not be directly applied to the case of asymmetric overloading. According to the traditional method of calculating the critical load of foundation, the additional stress and critical load of foundation are deduced and calculated under the condition of overload. The calculation and analysis results show that the unilateral overloading can increase the influence depth and width of the additional stress in the foundation and shift to the side with overload. Under the unilateral overload and the foundation critical load, The plastic zone of the foundation is no longer symmetrical but only appears on the opposite side of the overburden. The unilateral overloading has a limited impact on the critical load of the foundation, and can be neglected. This also verifies quantitatively the rationality of GB50007 on the provisions of the critical load under the condition of asymmetric overloading.