探地雷达及双液注浆在特大型基坑支护加固中的应用

The Application of Ground-searching Radar and Two-shot Grouting in the Outsize Pit Supporting

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。

Because some pits are left for a long time, the pit supporting may exceed its effective time of using. To ensure the safety of the pit supporting, we should reinforce the pit supporting： to weave and reinforce it with prestressed rock bolts; detect the geological situation around with the ground-searching radar. Then the cavities could be analyzed and treated in WSS. The results show that this method could treat the complicated pit well.