真空预压联合搅拌桩在有轨电车软基加固中的应用

发布时间：2018-06-29 14:43

本文选题：真空预压联合搅拌桩 + 现场监测　；参考：《岩土工程学报》2017年S1期

【摘要】：有轨电车以其绿色环保的运营方式正在引领中国交通行业向可持续方向发展。针对南京河西地区软土地基的结构特点和工程特性,提出了真空预压联合搅拌桩软基加固方法,结合施工期表层沉降、分层沉降、水平位移和孔压及运营期累计沉降监测结果,分析了该软基处理方法的加固效果。研究结果表明:在抽真空过程中,孔隙水压力随着深度的增加而逐渐减小;水平位移和分层沉降变化率均逐渐减小;表层总沉降量在抽真空2个月后趋于稳定,表明软土层接近完成固结;施工期的表层累计沉降量为440 mm;运营后半年累计沉降为4.2 mm,预测运营10 a后累计沉降约为9.8 mm,远低于设计警戒值。说明真空预压联合搅拌桩的方法可以有效加固有轨电车软土地基。
[Abstract]:Trams are leading China's transportation industry to sustainable development with its green operation. In view of the structural and engineering characteristics of soft soil foundation in Hexi area of Nanjing, a method of strengthening soft foundation with vacuum preloading combined with mixing pile is put forward, which combines the monitoring results of surface subsidence, stratified settlement, horizontal displacement, pore pressure and cumulative settlement during construction period. The reinforcement effect of the soft foundation treatment method is analyzed. The results show that during vacuum pumping, pore water pressure decreases with the increase of depth, horizontal displacement and stratified settlement change rate gradually decrease, and the total surface subsidence tends to be stable after 2 months of vacuum pumping. The results show that the soft soil layer is close to complete consolidation, the cumulative settlement of the surface layer is 440 mm during the construction period, and the accumulated settlement is 4.2 mm half a year after operation, and the cumulative settlement is about 9.8 mm after 10 years of operation, which is far lower than the design warning value. It is shown that the method of vacuum preloading and mixing pile can effectively strengthen the soft soil foundation of tram.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;江苏省岩土工程技术工程研究中心;河海大学岩土工程科学研究所;南京河西新城新型有轨电车建设有限公司;
【基金】：国家自然科学基金项目(51478166);国家自然科学基金重点国际(地区)合作研究项目(51420105013) “青蓝工程”资助项目中央高校基本科研业务费专项资金项目(2016B20614,2015B17814,2015B25914) “111”计划项目(B13024)
【分类号】：U492.433

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