真空预压法对周围环境影响及其防护措施研究  

The Effect of Vacuum Preloading on Nearby Ground Deformation and Its Control Method

作　　者：田报通 丰土根[1,2] 周密[3] 宋健[1,2] 

机构地区：[1]河海大学岩土工程水利部重点实验室,南京210098 [2]河海大学岩土工程研究所,南京210098 [3]西澳大学

出　　处：《河南科学》2016年第9期1459-1465,共7页Henan Science

基　　金：国家自然科学基金资助项目(51009054);教育部科学技术研究重点项目(109077);江苏省科学基金资助项目(BK2010513);中央高校基本科研业务费专项资金资助(2014B04914)

摘　　要：针对真空预压法软基处理施工过程对周围环境产生的不良影响问题，利用ABAQUS有限元软件分析了真空预压法施工对周围环境的影响范围．通过对比自由场地及不同防护措施下的计算结果，得到了单排桩达到最优防护效果时的桩长和位置、桩径对防护效果的影响，以及不同宽高比水泥土搅拌墙的防护效果．研究结果表明：单排桩防护时，在加固区边缘打桩且桩长超过排水板深度以下2～3m时防护效果最佳；随着单桩桩径增大，防护效果增强；水泥土搅拌墙的防护效果随宽高比增大而增强；单排桩防护与水泥土搅拌墙防护下影响区土体变形均得到明显控制，相比较后者的防护效果更优．Finite element method （FEM） analysis using package of ABAQUS is conducted to play insight into deformation influence of ground near the foundation improved by vacuum preloading method. By comparison with the deformation between foundation without improvement and the foundation improved by vacuum preloading treatment, the optimized pile spacing, pile length, pile arrangement, and geometry of cement-soil mixed continuous wall are gotten. Based on the numerical result, it shows that it can obtain best reinforcement effect under the condition of piling around the edge of improvement area and making the piles under the drain board 2 to 3 meters. With the pile diameter increasing and the increasing of the ratio of width divvied by height of cement-soil mixed continuous wall, the reinforcement effect becomes better. Compared the deformations of single row pile and cement-soil mixed continuous wall, it can be known that the improvement effect of cement-soil mixed continuous wall is better than the method of single row pile improvement.

关 键 词：真空预压 防护措施 有限元分析 

分 类 号：TU471.8[建筑科学—结构工程]