泥质软岩地基抗浮锚杆施工技术

Installation of Uplift Resistance Ground Anchors in Soft Rock

成都地区泥质软岩在干湿交替作用下具有软化、崩解的特性,在该类岩石地基施工,抗浮锚杆存在诸多有待解决的问题。通过对常规施工工法的分析和总结,形成了一套从基坑降排水处理、底板垫层浇筑(场地硬化处理)、钻机成孔(同时进行收渣降尘)、洗孔及污水沉淀处理全过程的新工法,并成功应用于实际工程中。其中,收渣降尘装置和洗孔装置原理结构简单,易于制作和安装;采用该工法施工有利于保护环境和作业人员健康安全、节约用水、缩短工期、降低成本、保护成品;该套施工方法实用性强、成本可控,在类似地层可推广应用。

Under the dry-wet cycles,the argillaceous rock in Chengdu area demonstrates softening and slaking properties and these properties have adverse effect in the installation of ground anchors in the soft argillaceous rock.This paper summarizes and evaluates the conventional ground anchor installation methods in soft argillaceous rock.A new installation procedure starting from foundation excavation dewatering,treme concrete at bottom slab(hardening of working platform);borehole drilling(drilling debris collection and dust control methods are applied);borehole flushing;to waste water collection and sedimentation has been developed.This new anchor installation procedure has been successfully applied in the practical projects.The devices for the debris collection and dust control as well as the borehole flushing are simple for the manufacture and for the installation.These new devices have the advantage of environmental and construction personnel friendly,water and construction schedule saving,and cost effective.