深基坑复合喷锚支护技术探讨

工程实践表明,复合喷锚支护是一种有效的深基坑支护型式,它可用于土层条件差、安全性要求高、变形控制严格的基坑工程中。复合支护中锚杆为主要受力构件,竖向花管为辅助受力构件,可起到限制、减小土体变形的作用。由于竖向注浆花管的加入,花管及注浆体抗剪作用加强,使基坑的整体稳定性得以大幅度提高。探讨了复合喷锚支护整体稳定性分析方法,建议将滑动区域分为加固土和原土两部分,将锚管注浆形成的注浆体等效为一层加固土,按喷锚支护模型计算复合喷锚支护整体稳定性。

Study on composite bolt-grouting support in deep excavation

Project practices show, composite bolt-grouting support is a kind of effective support means for excavation. The soil anchor is stress components, The primary function of the grouting pipe in composite bolt-grouting support is restricting deformation of soils and strengthening shear strength of soils, so it does, the integral stability has been raised substantially. The integral stability analysis method for composite bolt-grouting support is discussed, and an integral stability analysis method is suggested, in which composite body formed by grouting is treated as an equivalent stabilized soil and the integral stability of slope can be calculated according to computational model of bolt-grouting support. The method is proved by a case of composite bolt-grouting support.