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中文摘要：
在模型化临近建筑荷载为条形附加应力的基础上，借助极限分析上限定理，从能量角度定义了开挖基坑边坡的稳定性，阐明其失稳破坏机理．继而借助算例，分析了不同临近荷载条件下开挖基坑的稳定性特征和条件，给出了超前支护桩基坑开挖的优化设计．结果表明：基坑边坡稳定性取决于自身重力、临近建筑荷载和超前支护桩抗力等外力功率与坡体内能耗散功率的相对关系；支护桩设计抗力越大、邻近建筑荷载越小且离开挖点越远、开挖土体力学性质越好，则基坑越稳定，对应其潜在滑面位置也不断向基坑边坡内侧移动．
英文摘要：
By modelling the adjacent building load as the strip load and taking the upper bound theorem as a measure, the slope safety was defined from the perspective of energy and the failure mechanism of foundation pit was studied. Then the characteristics and conditions of pit slope stability under different actions of adjacent building load were analyzed with an example. The results show that the pit slope stability depends on the relative work rate done by the external force and the internal energy dissipation. The stability is usually much bigger for those pits which are better in soil mechanics and far from an adjacent building. Furthermore, with the increase of pile design resistance or decline of adjacent building load, the latent sliding face moves to the internal side of the pit slope, thus enhancing the pit slope stability greatly.
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