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结合岩溶地区地基处理的工程实例,利用有限元方法,对天然地基、水泥土搅拌桩加固、CFG桩加固、CM三维高强复合地基等方案进行数值模拟,计算分析了不同方案下桩身应力、土体附加应力分布及地基沉降。研究结果表明:复合地基中桩身应力与土体附加应力按刚度分配,桩侧土体应力与桩身应力表现出互补的特性;水泥土搅拌桩加固地基与天然地基具有相似的荷载-沉降曲线,CFG桩复合地基与CM三维高强复合地基具有相似的荷载-沉降曲线;CM三维高强复合地基采用半刚性短桩同刚性长桩相结合,半刚性短桩提高浅层地基承载力,刚性长桩可以控制沉降,地基处理效果与CFG桩复合地基接近。
Combined with engineering examples of foundation treatment in karst areas, the numerical simulation of schemes such as natural foundation, cement-soil mixing pile reinforcement, CFG pile reinforcement and CM three-dimensional high-strength composite foundation are carried out by using finite element method. Body Additional Stress Distribution and Foundation Settlement. The results show that the stress of pile body and the additional stress of soil are distributed according to the stiffness, and the stress of pile body and the stress of pile body show the complementary characteristics. The soil-cement mixing pile foundation has similar load-settlement curve with natural foundation , CFG pile composite foundation with CM three-dimensional high-strength composite foundation has a similar load-settlement curve; CM three-dimensional high-strength composite foundation with semi-rigid short piles combined with rigid long piles, semi-rigid piles improve shallow foundation bearing capacity, Can control the settlement, the foundation treatment effect and CFG pile composite foundation close.