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某工程项目基坑支护因开挖后长期搁置,导致基坑支护体系超过使用时限,为确保基坑支护结构的使用安全,对此基坑支护结构进行了加固处理。采用预应力锚杆对面层脱落部位重新编网并进行锚喷加固;采用探地雷达检测基坑周边地质变化情况,对形成的空洞危害状况进行了专业分析,并选用双重管无收缩双液注浆改良土体工法(即WSS工法)进行加固施工。检测结果表明,采用双液注浆技术配合探地雷达检测,能较好地完成复杂基坑土体的压密、固化和止水,值得推广应用。
The excavation support of an engineering project has been shelved for a long time after excavation, resulting in the support system of the foundation pit exceeding the service time limit. In order to ensure the safe use of the foundation pit support structure, the support structure of the foundation pit is reinforced. Using prestressed anchor on the surface off the site re-network and anchor spray gun reinforcement; using ground penetrating radar detection of geological changes surrounding the pit, the formation of the hole hazards of professional analysis and selection of double pipe without contraction of the two-fluid injection Soil improvement soil engineering method (ie WSS method) for reinforcement construction. The test results show that it is worth to popularize the application of double liquid grouting technology combined with ground penetrating radar detection to compaction, solidification and water stop of complex foundation pit well.