路基侧向变形行为及侧向约束模型试验研究

Study on Lateral Deformation Behavior of Subgrade and the Lateral Restraint Model Test

分析路基产生侧向变形的力学机理,采用弹性理论法和有限元法对路基坡脚处的侧向变形进行计算,并采用地下连续墙作为地基的侧向约束结构进行模型试验,监测地基不同深度处的侧向变形。结果表明:弹性理论法的计算结果偏小,但同时说明路基的沉降计算不应忽视侧向变形的影响,路基在荷载作用下产生的塑性变形是工后沉降的主要组成部分,而侧向变形是路基产生塑性变形的主要原因之一。通过试验得出,地下连续墙作为地基的侧向约束结构能够有效限制地基土的侧向变形,减小地基沉降。

The mechanical mechanism of lateral deformation occurring in subgrade was analyzed,and elastic theory and finite element methods were used respectively to calculate the lateral deformation at the foot of subgrade.The model test was carried out in such manner that underground diaphragm wall was used to act as the lateral restraint structure for the foundation,then the lateral deformation in different depth of the foundation were monitored.The results show that,the calculation of elastic theory method comes to a smaller result,at the same time,there also gives a description that the effect of lateral deformation shall not be ignored in the calculation of subgrade settlement.By the test,there draws a conclusion that underground diaphragm wall,as the lateral restraint structure for the foundation,can effectively restrict the lateral deformation of foundation soil and then reduce the foundation settlement.