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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。
Taking the roof of karst cave under pile load of a high-rise building in Longcheng Industrial Park, Longgang District, Shenzhen City as the research object, the safety thickness of the roof of karst cave under pile foundation load was studied by theoretical formula and numerical simulation method respectively. The influence factors of the safety thickness and each single factor are obtained by taking the bearing capacity of single pile, cave span, cave shape coefficient and pile end eccentricity as the influencing factors of the safety thickness of the roof. The influence rules of safety thickness and each single factor are obtained through numerical simulation. Prediction model of safety thickness. Under the premise of ensuring safety, comparing the predicted model value with the theoretical formula value, it is concluded that the prediction model is more reasonable and economical, which is of guiding significance to the design and site construction of pile foundation of karst high-rise building.