桂林国际会展中心地基的强夯加固处理

Strengthening the Ground of Guilin International Chamber Exhibition Center by Dynamic Compaction

结合工程实例,对强夯主要参数加固深度、单位夯击能、孔隙水压力、夯点间距、夯点复夯等的确定原则进行了分析探讨.施工中遇到的最大难题是夯点的最后两击平均夯沉量80～90 mm,大于规范允许值50 mm.在确保工程质量的前提下为降低工程造价和缩短工期,适当的将夯点最后两击平均夯沉量进行调整,按其不大于100 mm控制施工,并在施工中进行现场静载试验和孔隙水压力试验以监测效果.地基承载力标准值fk为202 kPa,变形模量E0为13.06 MPa,均满足设计要求;加固深度约6 m,符合规范估计深度,证明按调整后的夯沉量指标控制施工切实可行.

The principle of the main parameter of dynamic compaction strengthening depth,tamping energy water pressure of the hole are studied in a project.General difficulty in construction is the last two sinks rammer of 80~90 mm greater than the standard of 50 mm.In guaranteeing project quality to shorten time limit of project and reduce the cost,the sinking rammer of the last two bombarding must be adjusted in the construction so that the sinking amount of the average rammer is not greater than 100 mm in the test in order to monitor the result of hole water pressure and static loading test.In the test result f_k is 202 kPa and E_0 is 13.06 MPa. All the test results satisfy the design and strengthen about 6 m depth confirming to estimated depth.According to the adjusted index of sinking rammer,the project quality can be guaranteed.