黄土斜坡地基附加应力

Additional Stress of Loess Slope Foundation

针对黄土斜坡地基,围绕斜坡坡角、基础埋深、临坡距三个因素对斜坡地基附加应力的影响开展了系列探究试验。试验结果表明,斜坡坡角对斜坡地基附加应力影响巨大,坡角越大地基附加应力实测值与理论弹性解Boussinesq解差距越大,从而证明Boussinesq解不能直接用于斜坡地基附加应力计算,应给出相应的折减;小临坡距、大坡角的不同基础埋深试验表明,小临坡距、大坡角基础安全性及稳定性的提高不能依赖于增大基础埋深;关于临坡距的系列探究试验表明,临坡距越小,基础下方土体附加应力不对称性愈发凸出,而随着临坡距的增大,附加应力的不对称性得到明显缓解。为了基础择址不过于保守,同时满足安全性、稳定性的要求,应选择最优临坡距。

Aiming at the loess slope foundation, focused on three factors, which are the slope angle, the foundation depth and the slope distance, we have carried out a series of research experiments on the influence of the additional stress of the slope foundation. The test results show that the slope angle has great influence on the additional stress of the slope foundation.The bigger the slope, the greater difference between measured value and Boussinesq solution on additional stress of loess slope foundation, which proves that Boussinesq solution can not be directly used for the calculation of slope foundation＇s additional stress, it should be given the corresponding reduction; Tests in small slope distance, large slope angle and different foundation depth show that the increase of foundation depth has nothing to do with the improvement of safety on small slope length foundation and small angle foundation; Series tests on the slope distance show that the smaller the slope distance is, the more asymmetric additional stress appears in the soil beneath the foundation, and with the increase of slope distance, the asymmetry of the additional stress relieved. In order to choose the basis of the foundation on condition that it is not too conservative, at the same time meets the safety and stability requirements, we should choose the best slope distance.