桩承加筋土复合地基试验及稳定研究

通过设计柔性荷载下桩承加筋土复合地基室内模型试验,研究了复合地基在极限柔性荷载作用下的相应沉降规律及桩土应力变化,并探讨分析加筋垫层对地基稳定性影响。试验结果表明:增大垫层厚度,复合地基沉降增大明显,桩身沉降增大,纯砂区沉降增大,不利于复合地基的稳定性;增加土工格栅的层数对于高厚度垫层的复合地基有明显的改善效果,复合地基的沉降减小,桩身沉降增大,纯砂区沉降减小,桩土应力比增大,有利于桩承加筋土复合地基的地基整体稳定性。

TEST STUDY AND STABILITY ANALYSIS OF THE GEOGRID-REINFORCED AND PILE-SUPPORTED COMPOSITE FOUNDATION

The study of the regulation of foundation＇s settlement、the change in stress of piles and soil and the reinforced stills to the influence on the stability of geogrid-reinforced and pile-supported composite foundation are probed through an indoor model test of geogrid-reinforced and pile-supported composite foundation with extremely flexible load.The test results show that as the thickness of the still increases,the settlement of the composite foundation increases obviously and the shaft settlement,pure sand settlement increase,it is not conducive to the stability of composite foundation.The composite foundation of thick stills can be greatly improved by adding the number of geo-grids and the settlement except the shaft settlement will decrease and the stress ratio of the pile to the soil will increase,in favor to the overall stability of the foundation.