桩筏基础路基地基应力测试研究

研究目的:附加应力是路基地基沉降分析中非常重要的参数,附加应力计算方法不同,计算结果差异较大。本次研究拟通过现场测试了解桩筏基础路基地基应力分布规律。研究结论:(1)桩筏基础路基地基实际应力小于计算值是沉降计算误差产生的原因之一;(2)桩筏基础路基地基加固存在临界桩长;(3)地下水位以下土层自重应力计算采用浮容重是合理的。

Research on Test of Foundation Stress for the Subgrade with Piled Raft Foundation

Research purposes: Additional stress is a critical parameter in the subgrade settlement analysis of foundation,and it will be quite different with different calculation methods.The purpose of this research is to understand the distribution of foundation stress of the subgrade with piled raft foundation by doing the on-site testing. Research conclusions:(1)The matter that the actual additional stress of the subgrade with piled raft foundation is less than the calculated value is one of the causes for the error of the settlement calculation.(2)There is a critical pile length in foundation reinforcement for the subgrade with piled raft foundation.(3)It is reasonable to calculate the self-weight stress of the soil below the groundwater level by using floating density.