浅论深基坑粉喷桩—土层锚杆联合支护技术

Discussion on combined dry jet mixing pile and soil anchor support in deep excavation

粉喷桩与土层锚杆联合支护方式可同时解决支护与止水双重问题,在基坑开挖深度不大,基坑周边环境条件严重受限的情况下,可充分显示出其技术经济方面的优越性,值得应用推广。文中探讨了该联合支护方式的设计方法,建议按喷锚支护模型计算边坡整体稳定性,计算中将粉喷桩等效为一层加固土。通过工程实例,验证了建议的计算模型。并且还对施工中应注意的一些问题进行了阐述。

The support technique of combined dry jet mixing pile and soil anchor can solve stability and water proof in deep foundation pit at the same time. If the foundation pit is not deep and the surroundings around it are limited seriously, the superiority of the scheme in technique and economy is obvious. It is worth being used and spread widely. In this paper, the design method of the combined support is discussed. Combined bolting and shotcrete computational model is suggested in which dry jet mixing pile is equal to a layer of reinforced soil. The suggested model is proved by an engineering example. Finally, some remarkable problems are expounded.