钢管土钉支护在深厚填土基坑中的应用实践  

Application of the Steel Tube Soil Nail Supported Deep Excavations in High Fills

作　　者：周兴龙 周丽红 ZHOU Xinglong;ZHOU Lihong(Guangdong Engineering Investigation Institute,Guangzhou 510000;Guangzhou Jintu Geotechnical Engineering Co.Ltd.,Guangzhou 510000)

机构地区：[1]广东省工程勘察院,广州510000 [2]广州金土岩土工程技术有限公司,广州510000

出　　处：《土工基础》2023年第1期10-13,共4页Soil Engineering and Foundation

摘　　要：在深厚填土区域进行深基坑开挖,由于填土成分不均匀,工程性质较差,其对周边造成的环境影响较为敏感,给基坑支护带来较大的技术挑战。钢管土钉支护是一种通过向土层中打入(或预钻孔后再置入)带有倒刺、出浆孔的钢花管,并进行注浆的支护型式,其与钢筋土钉的主要区别在于锚筋采用钢花管而非钢筋,更适用于松散土层,施工更为简便。介绍了在深厚填土区域钢管土钉+放坡的组合基坑支护方案,实践表明,在地下水位较低的松散深厚填土基坑中采用钢管土钉支护是可行的。As a large technical challenge,the deep excavation in high fill soils usually is usually sensitive to the adjacent environmental impact due to their heterogeneous nature of the backfill soils and poor engineering properties.The excavation supporting structure in these areas are usually have the characteristics of high investment cost and long construction schedule.The steel tube soil nail wall is installed by driving(or predrilling and placing)the perforated steel tube with barbs into the borehole and the grouting the tubes.The major difference between the steel tube soil nails and conventional soil nails is that the steel tube soil nails utilizing the perforated steel tubes comparing the regular reinforcement bars,and it is more suitable applying in the loose soil strata.This paper presents a combination of steel tube soil nail wall plus sloped open cut.The construction experience indicates that this type of soil nail wall is applicable to the loose fill soils with low groundwater table.

关 键 词：钢管土钉 填土 基坑 

分 类 号：TU473[建筑科学—结构工程]