装配式预应力体系和SMW工法桩联合支护安全性分析  

Security analysis on combined supporting structure of fabricated prestressed system and SMW pile

作　　者：陈越[1,2] 杜晓丽[1] 

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]上海强劲地基工程股份有限公司,上海200233

出　　处：《能源与环保》2017年第1期108-112,116,共6页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：中国博士后科学基金资助项目(2013M541811);安徽省教育厅自然科学重大项目(KJ2015ZD20)

摘　　要：某湖沼平原地区深基坑采用装配式预应力支撑体系和SMW工法桩联合支护技术。根据该联合支护结构的施工工艺,分析了其优点、变形控制和刚度控制机理。运用MIDAS/GTS有限元软件分析了装配式预应力支撑体系的内力和变形规律,得出该支撑体系具有较大的刚度,在土压力作用下该支撑体系变形相对较小,结构安全可靠。通过对基坑周边道路、建筑和围护结构等严密的监测,分析了联合支护结构的支护效果和变形规律,并结合有限元分析结果得出联合支护结构具有较好的止水和支护效果,能有效控制基坑变形尤其是坑顶附近围护结构和周边环境变形,保证基坑安全,进一步验证了在长三角、湖沼平原等地区较复杂工程地质条件下该联合支护结构具有较好的适用性。The technology of fabricated prestressed system and combined SMW pile was adopted in a deep foundation pit of some lake plain area. According to the construction process of the combined supporting structure, this paper analyzed the advantages, deformation control and stiffness control mechanism of the combined supporting structure. The finite element software MIDAS/GTS was adopted to analyze internal forces and deformations for assembled prestressed supporting system,which concluded that the supporting system has a large stiffness, and that the deformation of the supporting system is relatively small under the action of soil pressure, so that the structure is safe and reliable. Through strict monitoring of foundation pit surrounding roads, buildings and enclosure structure, this paper analyzed the supporting effect and deformation rules of the combined supporting structure. And combined with the finite element analysis results, it shows that combined supporting structure has good sealing and supporting effect, which can effectively control the pit deformation, es- pecially deformation of the pit roof near the retaining structure and surrounding environment, ensuring the safety of foundation pit. In the end, it further verified the combined supporting structure has better applicability under complicated engineering geological conditions in the Yangtze River Delta and limnetic plain and so on.

关 键 词：预应力支撑体系 SMW工法桩 MIDAS/GTS有限元分析 变形控制 基坑 

分 类 号：TU753.3[建筑科学—建筑技术科学]