桩侧溶洞对桩基础承载力的影响研究

Study on the Influence of Pile Side Caves on Pile Foundation Bearing Capacity

溶洞发育和形式的差异导致其可能出现在桩侧或桩底,出现在不同位置对桩基的承载力影响不同。文中对岩溶区溶洞在桩侧对桩基承载力的影响进行了数值分析;根据某实桥工程桩基尺寸,对溶洞进行建模,从溶洞长度、高度对桩基水平和垂直承载力的影响出发,对溶洞进行了研究。研究表明,当桩基顶部水平位移大于0.05 m时,水平荷载与溶洞长度呈正相关关系,但溶洞的高度对承载力影响不大。研究结果对岩溶地区桩基的设计和施工具有重要意义。

The difference of karst cave development and situation leads to the possibility of karst cave appearing at pile side or pile bottom,and the bearing capacity of pile foundation is different at different positions.This paper conducts a numerical analysis on the influence of caves on the pile side in karst areas on the bearing capacity of pile foundations.According to the size of pile foundation of a real bridge project,the karst cave is modeled,and the influence of the length and height of the karst cave on the horizontal and vertical bearing capacity of pile foundation is studied.The results show that when the horizontal displacement of the top of the pile foundation is greater than O.05m,the horizontal load is positively correlated with the length of the cave,but the height of the cave has litle effect on the bearing capacity.The research results are of great significance to the design and construction of pile foundation in karst area.