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根据某大型炼化工程的物探和勘察资料,建立了覆盖型岩溶发育区典型圆形单洞的数值计算模型。采用分级加载模式,模拟不同压力下单洞的渐进式破坏过程,同时考虑了基础、上覆土层、溶洞顶板的相互作用。给出了不同荷载下溶洞剖面的剪切应变增量云图,直观揭示覆盖型岩溶单洞的破坏机理。结合工程实际,得出了理想状态下该单洞的极限承载力。
According to the geophysical and geological survey data of a large scale refinery project, a numerical calculation model of a typical circular single hole in a covered karst development area is established. The hierarchical loading mode is adopted to simulate the progressive failure process of single holes under different pressures. The interaction between foundation, overburden and cave roof is also considered. The shear strain increment of the karst cave profile under different loads is given and the failure mechanism of the karst single hole is revealed intuitively. According to the engineering practice, the ultimate bearing capacity of the single hole under ideal condition is obtained.