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某高层办公楼建造场地地质分布极不均匀,存在软弱土、岩体破碎带等不良地质条件,采用天然地基与常规桩基均不合适。经方案比选,采用刚性桩复合地基,结合桩间土注浆、桩底后注浆的综合性地基处理方案,可满足承载要求。针对因施工质量原因,实际桩长远小于设计要求,从而造成单桩竖向承载力检测不合格,并导致复合压板静载试验结果未能满足承载力要求的状况,根据现场施工条件,提出通过人工套挖置换成桩,构造二元刚性桩复合地基的解决方案。加固措施实施效果良好,实测沉降远小于规范限值。采用的地基处理方案针对性较强,工程事故处理方法实用性较好。
A high-rise office building construction site is extremely uneven geological distribution, there are soft soil, rock fragments and other adverse geological conditions, the use of natural foundations and conventional pile are not appropriate. Through the program comparison and selection, the rigid pile composite foundation, combined with the soil between the pile grouting, pile bottom grouting comprehensive foundation treatment program to meet the bearing requirements. In view of the construction quality reasons, the actual pile length is far less than the design requirements, which results in unqualified vertical bearing capacity testing of single pile and results in failure of the static load test results of composite platens to meet the requirements of bearing capacity. According to the construction conditions of the site, Set dug into piles, construction of dual rigid pile composite foundation solution. Reinforcing measures implemented well, the measured settlement is far less than the specification limits. The ground treatment scheme used is highly targeted and the engineering accident treatment method has good practicability.