路堤荷载作用下水泥土搅拌桩复合地基变形监测研究

Study on Deformation Monitoring of Cement-soil Mixing Pile Composite Foundation under the Action of Embankment Load

以南京市六合区境内新建一级公路K2+220~+540试验段为依托,对高填方路堤情况下水泥土搅拌桩复合地基的沉降变形和侧向变形开展现场监测;深入分析相关监测数据,得到路基填筑作用下水泥搅拌桩复合地基变形特性。结果表明:复合地基分层沉降和土层压缩量随着深度增大而显著减小,填筑期间沉降速率相对较快,持荷期间沉降速率相对趋缓,路基侧向变形沿深度增加而减小。

Based on the test section K2+220~+540 of newly built first-class highway at Liuhe District in Nanjing,the field monitoring on the settlement deformation and lateral deformation of cement-soil mixing pile composite foundation in the condition of high-fill embankment was carried out.Through the analysis of the relevant monitoring data,there obtained the deformation characteristics of cement-soil mixing pile composite foundation under the action of subgrade filling.The result shows that,the settlement in layers of the composite foundation and the compression of soil layers decreases obviously with the increase of depth,and the settlement rate is relatively fast in the course of filling,and becomes slow in the duration of load;the lateral deformation of subgrade decreases along with the increase of depth.