边坡坡角对地基极限承载力的衰减效应

Attenuation effect of slope angle on ultimate bearing capacity of foundation

为研究边坡角大小对地基承载力的影响,采用有限元载荷试验进行数值模拟计算,建立了简化的地基及边坡—地基模型,计算出地基的极限承载力大小,并分析了地基的极限承载力随着边坡坡角的变化规律。结果表明:载荷试验下,模型的等效塑形区不断上移,当模型破坏时,等效塑形区完全位于地基破坏区域;在相同的基础载荷情况下,边坡—地基模型随着坡角的增加,模型整体位移不断增加,且增加幅度较缓;当载荷达到一定时,位移出现突变,并且增加幅度变大;边坡的形成将对地基极限承载力有衰减效应,并且地基极限承载力的衰减效应随着坡角的增加总体呈非线性变大趋势,但其衰减效应幅度随着坡角的增加逐渐变缓。

In order to study the influence of slope angle on the bearing capacity of foundation, the finite element load test is used to simulate the foundation. The simplified foundation and slope-foundation model are established to calculate the ultimate bearing capacity of the foundation and analyzed the limit of the foundation bearing capacity changes along the slope angle. The results show that under the load test, the equivalent shaping area of the model is continuously moved up. When the model is destroyed, the equivalent shaping area is completely located in the ground failure area. Under the same base load, as the angle is increases, the overall displacement of the model increases, and the increase is slower. When the load reaches a certain time, the displacement becomes abrupt and the increase is larger. The formation of the slope will have the attenuation effect on the ultimate bearing capacity of the foundation. The attenuation effect of force is increases nonlinearly with the increase of slope angle, but its attenuation effect gradually decreases with the increase of slope angle.