强夯及强夯置换技术在客运专线复合地基处理中的应用

研究目的：强夯及强夯置换技术在客运专线复合地基中的应用效果。研究方法：通过武广客运专线武汉工程试验段强夯及强夯置换技术应用于松软土复合地基处理的工程实践，结合工程地质条件，从施工方法选择，工艺流程设计，质量控制等几个方面对强夯及强夯置换施工技术在客运专线铁路中的应用进行系统性应用研究。研究结果：综合考虑施工机械的性能及适宜地质条件，在新建武广铁路客运专线武汉工程试验段内选择典型区段分别进行强夯、强夯置换工艺试验以及夯前夯后检测结果对比分析，确定强夯与强夯置换工艺在新建武广客运专线近似地质条件下的适用性，总结完善近似地质条件下施工工艺和经验，确定了相关工艺参数及检测方法，能够较好地满足承载力和设计变形值要求，能较好地控制工后沉降，加固效果明显，经济可行。研究结论：夯击能是强夯及强夯置换工艺中决定加固深度的重要指标，强夯及强夯置换加固处理粘性土特别是饱和粘性土均需要合理的间歇时间，强夯及强夯置换适用于客运专线复合地基加固处理。

Application of Strong Tamping and its Replacement Technology in Reinforcing Composite Subgrade of Railway Passenger Dedicated Line

Research purposes: The purposes are to do research on the applicable effects of strong tamping and its replacement technology used for reinforcing composite subgrade of railway passenger dedicated line.Research methods:Based on the construction practice of reinforcing weak soil composite subgrade in the experiment section of Wuchang-Guangzhou Railway Passenger Dedicated Line,the systematic researches are done on application of strong tamping and its replacement technology in reinforcing subgrade of passenger dedicated line from the fields of selection of construction method,design of technique procedure and quality control according the engineering geological conditions.Research results:Taking the performances of construction machinery and geological conditions into account,the tests of strong tamping and its replacement technology are done in the different typical areas in Wuhan Experiment Section and the comparison and analysis are made for the tested results before and after strong tamping to determine the its applicability for Wuchang-Guangzhou Passenger Dedicated Line under similar geological conditions,improve the construction technique,sum up its experience and lay down the technical parameters and test methods.The practice shows strong tamping and its replacement technology are feasible for reinforcing subgrade with satisfying the requirements of bearing capacity and design deformation and better control post-construction settlement.Research conclusions:Tamping capacity is an important index of reinforcement depth for using tamping and its replacement technology.It needs rational interval time to use strong tamping and its replacement technology for reinforcing clay soil,especially for saturated clay soil.Strong tamping and its replacement technology are suitable for reinforcing the composite subgrade of passenger dedicated line.