某工程岩溶桩基分析处理

某９层框剪结构商住楼，采用挖孔桩基础，持力层为微风化石灰岩，超前钻揭示桩底有溶洞溶洞大小不等，首先分析了溶洞发育状况尤其是石灰岩质坚硬寒带程度、岸芯取经（ＢＱＤ）、再根据桩基荷载，对溶洞顶板进行了抗冲切、抗剪及抗弯验算，提出了相应处理方案，经实践及沉降观测证明是正确的。

ANALYSIS AND TREATMENT OF KARST PILE FOUNDATION IN A CERTAIN CONSTRUCTION

In the excavated pile foundation for a nine floor of frame structure building, the load bearing layer is a slightly weathered limestone. With advance drilling, it is found that under piles there are cavities whose sizes are different.The cavity development is first analyzed,specially integrity of limestone hardness and core recovery. Based on pile foundation load, the checking calculations are then made on die cutting, shearing and bening resistance for the top plate of cavities and related treatment plan is presented, which is proved to be right through practice and settling observation.