河套地区液化地基桩基处理研究

Study on liquefaction ground treatment by pile foundation in Hetao area

河套地区地下水位埋深浅,地基土多为液化软土,液化等级以中等为主,建筑地基常采用桩基础来处理地基土的液化问题,提高了承载力。本文通过河套地区三个典型试验场地进行的桩基处理液化地基试验,对河套地区液化地层的工程地质特征进行了评价。结合试验区试桩桩身完整性分析成果,总结了河套地区成桩施工工艺。通过对试桩桩身受力特征进行分析研究,汇总了河套典型地区桩周土极限侧阻力标准值和极限端阻力标准值,可供类似工程设计参考。

The groundwater level is shallow in Hetao area.The ground usually consists of liquefied loose soil,and the liquefaction grade is medium.The liquefaction soft ground is often treated and the bearing capacity is improved by pile foundation.The engineering geological characteristics of liquefaction strata in Hetao area is evaluated by ground treatment tests of piling method in three typical sites.Combined with the of pile integrity analysis,the pile construction technique is summarized.Through analysis of the internal force of the test pile shaft,the standard values of ultimate lateral resistance and ultimate end resistance of soil around piles in Hetao area are proposed.The result could be referred by the similar design.