论文部分内容阅读
针对广州某中央商务区核心区地下空间钻孔灌注桩的超大吨位静载试验,分析了静载试验加载过程中Q-s曲线和桩周土体的位移变化。分析表明:当荷载小于试桩竖向承载力特征值时,试桩的竖向刚度几乎保持不变。试验加载时,越靠近大梁的土体出现卸荷回弹的现象越明显,同时桩周土体由于剪切作用会发生沉降,两者作用同时发生造成桩周一定范围内土体隆起,加载时对桩周土体的影响范围可定为4 d。
According to the large tonnage static load test of underground bored piles in the core area of a central business district in Guangzhou, the Q-s curve and the displacement of the soil around the pile during static loading test are analyzed. The analysis shows that when the load is less than the characteristic value of vertical bearing capacity of test pile, the vertical rigidity of test pile remains almost unchanged. At the time of loading, the phenomenon that the unloading rebound occurs in the soil closer to the girder is more obvious. At the same time, the settlement of the soil around the pile due to shearing action will occur. Both of them will cause the soil body to bulge within a certain range of the pile circumference at the same time. The influence range of soil around pile can be set as 4 d.