高层建筑桩基荷载下溶洞顶板的安全厚度

Safety Thickness of Cave Roof under Pile Foundation of High-level Building

以深圳市龙岗区龙城工业园内某高层建筑桩基荷载下的溶洞顶板为研究对象,运用理论公式和数值模拟方法分别对桩基荷载下溶洞顶板安全厚度进行研究。选取单桩承载力、溶洞洞跨、溶洞形态系数、桩端偏心率作为顶板安全厚度的影响因素,通过数值模拟得到了安全厚度与各单因素之间的影响规律,并综合考虑这些影响因素得到安全厚度的预测模型。在能保证安全的前提下,将预测模型值与理论公式值进行对比,判断出预测模型更合理节约,对岩溶地基高层建筑桩基设计和现场施工有一定的指导意义。

Example of Karst roof was take under pile foundation load of the high-level buildings in Shenzhen Longgang.Using the theory and numerical simulation methods,safety thickness of roof under pile foundation load had been carried out in-depth research.Selecting the capacity of single pile and the span of Karst cave and the coefficient of Karst cave and the eccentricity between pile and cave to be the affecting factors to safe thickness of roof,the regulation between it and the various influencing factors was obtained by numerical simulation and the prediction model considered the comprehension of influence factors was determined.After insuring the security of engineering,comparing the calculation results of theoretical formula and the prediction model values,the prediction model was more reasonable and economical,and it gives certain guiding significance of pile foundation design and site construction of high-level building of Karst ground.