局部地质水文特征对钻孔压灌CFG桩施工质量的影响

以温渝河冲洪积扇前缘地形的北京某工程为例，对CFG桩的完成情况进行检测，针对低应变动测检测结果出现的问题，通过公式验算首先排除了设计误差，在对场地内局部地区的区域性水文地质特征进行排查分析中发现：透水性好的土层（处于饱和状态下，极易产生水头较高的局部特征，在CFG桩的压灌过程中造成了钻头阀门打不开或打开的压力不足，形成了断桩或缩径的现象，并在随后进行的低应变动测检测中得到验证。由此确定透水性好的土层应在施工过程中控制水头压力对CFG桩施工质量产生的影响，提出了保护性预防措施和处理险情的建议。

Make a rough discussion about the part feature of geology and hydrology that may affect the working quality of the CFG pile

In the first this paper describe the strong point and the special feature of the CFG pile in the working couse,it also de- scribe instances of real project based on the feature of geology and hydrology.In order to raise the endure force of foundation also the loading module,in the end ,it chose the CFG pile as the design plan. This paper describe the CFG pile,s verifying couse of the design plan,then describe,the CFG pile,s technology of the work- ing couse,it include:equipment,s adjusting,surveying and dra...