福建三明永嘉天地建筑场地岩溶地质特征及稳定性评价

Karst Geological Characteristics and Evaluation Stability of Yongjia Tiandi Construction Site in Sanming City,Fujian Province

岩溶发育对建筑场地不利,容易引起地面塌陷、桩基承载力不足等问题。以三明永嘉天地建筑场地为例,基于工程地质详勘对场地岩溶发展趋势和稳定性进行评价分析,并提出施工治理措施。结果表明场地内岩溶发育强烈,发现有全充填溶洞、半充填溶洞、空洞3种类型,并有继续扩大趋势;经钻孔揭露场地内有13个钻孔呈半充填和空洞,属于较稳定状态,1个钻孔属于不稳定状态;岩溶桩基采用套筒护壁、洞隙填塞等措施施工后,完整性好,单桩竖向抗压和抗拔承载力满足要求。该研究可为类似工程提供有益的参考借鉴。

Karst development is unfavorable to the construction site,which can easily cause ground collapse and insufficient bearing capacity of pile foundation.Taking the Yongjia Tiandi construction site in Sanming city as an example,the development trend and stability of karst in the site are evaluated and analyzed based on the detailed exploration of engineering geology,and the construction treatment measures are put forward.The results show that the karst in the site is developed strongly,and there are three types of fully filled caverns,semi filled caverns and cavities,and there is a trend of continuous expansion.There are 13boreholes in the site which are semi-filled and empty,which belong to the stable state and one borehole belongs to the unstable state.After the construction of karst pile foundation with sleeve wall protection and hole gap packing,the integrity is good,and the vertical compressive and uplift bearing capacity of single pile meets the requirements.This study can provide useful reference for similar projects.