BIM技术在地下溶洞嵌岩桩基极限承载力评定中的应用

Application of BIM technology in evaluation of ultimate bearing capacity of rock-socketed pile foundation in underground karst cave

为了提高地下溶洞嵌岩桩基的安全性,提出了BIM技术在地下溶洞嵌岩桩基极限承载力评定中的应用。计算地下溶洞嵌岩桩基在岩层的平均应力,获取的承载机理,明确地下溶洞嵌岩的地质特点,计算地下溶洞嵌岩桩基容许承载力,利用BIM技术,完成地下溶洞嵌岩桩基的BIM建模。根据地下溶洞嵌岩桩基应力分量,计算地下溶洞嵌岩桩基在含溶洞地层中的平均约束应力,通过设定极限承载力阈值,评定地下溶洞嵌岩桩基极限承载力。实验结果表明,所提方法对地下溶洞嵌岩桩基极限承载力的评定结果与工程实际相符,可以缩小评定误差。

In order to improve the safety of underground karst cave rock⁃socketed pile foundation,the application of BIM technology in the evaluation of ultimate bearing capacity of underground karst cave rock⁃socketed pile foundation was proposed.The average stress of the rock⁃socketed pile foundation in the underground karst cave was calculated,the bearing mechanism was obtained,the geological characteristics of the rock⁃socketed rock in the underground karst cave were clarified,the allowable bearing capacity of the rock⁃socketed pile foundation of the underground karst cave was calculated,and the BIM modeling of the rock⁃socketed pile foundation of the underground karst cave was completed by using BIM technology.According to the stress component of underground karst cave rock⁃socketed pile foundation,the average constraint stress of the rock⁃socketed pile foundation in the karst cave⁃bearing stratum was calculated,and the ultimate bearing capacity of the rock⁃socketed pile foundation in the under‐ground karst cave was evaluated by setting the ultimate bearing capacity threshold.The experimental results showed that the evaluation results of the proposed method for the ultimate bearing capacity of the rock⁃socketed pile foundation in underground karst caves were consistent with the engineering practice and could reduce the evaluation error.