城市主干道软基处理的现场监测数据分析  

In-Situ Measurement Data Analysis of Soft Ground Treatment for Urban Trunk Road

作　　者：常方强[1] 涂帆[1] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021

出　　处：《华侨大学学报（自然科学版）》2010年第4期468-472,共5页Journal of Huaqiao University(Natural Science)

基　　金：福建省自然科学基金计划资助项目(E0710019);华侨大学高层次人才科研启动项目(09BS621)

摘　　要：采用中间为袋装砂井,两边为粉喷桩的联合处理方式处理试验路段,通过在软基内埋设测斜管、沉降盘、孔压计和压力盒等,对路基沉降、侧向变形、孔压以及桩土应力比进行监测.结果表明,袋装砂井处理的路中部分沉降较大,而粉喷桩处理的路肩部分沉降较小,其中后者沉降约为前者的1/40;路堤填土达设计标高后,路中沉降大约还需5个月才能基本稳定,而粉喷桩处理的路肩在填土结束后沉降很快就达到稳定;交砂(袋装砂井)处的侧向位移比坡脚(粉喷桩)处的大得多,前者的最大侧移在5.5 m深度处,后者的最大侧移在地表附近;粉喷桩桩土应力比最大值约为1.80,路堤填筑完成后,应力比逐步减小,最后稳定在1.1左右.The joint-treatment method,that is,middle section with bagged sand well（BSW） and both sides with dry jetting mixing（DJM） is adopted to treat a road section.Some measuring instruments are buried in the road section,including Inclinometer tube,settlement plate,pore water pressure meter,and pressure cell.Various parameters are monitored,including settlement,lateral displacement,pore pressure and pile-soil stress ratio.The results show： settlement in both sides treated by DJM is approximately 1/40 of that in middle section treated by BSW;roadbed settlement of middle section would last at least 5 months after filling finished,while the settlement at road-shoulder could be stable soon after filling finished due to DJM;lateral displacement treated by BSW is larger than that at the foot treated by DJM,the depth of maximum lateral displacement by BSW is 5.5 mm,while the maximum lateral displacement by DJM occurs on the ground surface;pile-soil stress ratio reaches the maximum value of about 1.8 and decreases gradually after filling finished,and then remains at stable value near 1.1.

关 键 词：软基处理 城市主干道 沉降 监测 粉喷桩 袋装砂井 

分 类 号：TU433[建筑科学—岩土工程] U412.3[建筑科学—土工工程]