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关于复合加载条件下裙板式基础稳定性研究中,传统方法都是将基础底面中心作为荷载参考点,从而导致裙板式基础的破坏包络面形状非常复杂,而且依赖于埋深与宽度之比。为了得到能够适用于一定埋深比范围的统一破坏包络面方程,建议了一种裙板式基础最优荷载参考点的搜索方法,并将之在有限元软件ABAQUS中予以数值实施。基于最优荷载参考点,联合采用swipe加载和固定位移比加载两种方法,所得到的归一化破坏包络面可以近似为力矩–水平荷载空间内的椭圆。进而提出了双参数的统一破坏包络面方程,该方程可以用于估计正常固结软黏土地基上裙板式基础的稳定性。对于工程上常用的裙板式基础埋深比,还给出了方程中的参数取值范围。通过与有关离心模型试验结果的对比分析,在一定程度上验证了本文所提出的破坏包络面方程的合理性。
In the research on the stability of apron foundation under composite loading, the conventional method uses the center of the base as the reference point of load, which leads to the complex envelope shape of the apron foundation, and depends on the ratio of depth to width. In order to get the unified failure surface equation which can be applied to a certain range of depth to depth ratio, a search method of apron optimal load reference point is proposed and implemented in the finite element software ABAQUS. Based on the optimal load reference point, two methods, swipe loading and fixed displacement ratio loading, are combined. The normalized failure envelope can be approximated as an ellipse in the moment-horizontal load space. Then a two-parameter uniform damage envelope equation is proposed, which can be used to estimate the stability of apron foundation on the normal consolidated soft clay foundation. For the engineering commonly used apron buried depth ratio, but also gives the range of parameters in the equation. By comparing with the results of centrifugal model tests, the rationality of the damage envelope equation proposed in this paper is verified to some extent.