注浆钢管加筋在基坑支护工程中的应用  

Application of the Grouted Steel Tube Reinforcement as the Supporting System for the Deep Excavation

作　　者：杨宇航[1] 张可能[1] 张顺清 YANG Yuhang ZHANG Keneng ZHANG Shunqing(School of Geoscienees and Info-Physies, Central South University, Changsha 410083 Hunan Construction Engineering Group, Changsha 410004)

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]湖南建工集团,长沙410004

出　　处：《土工基础》2017年第2期123-127,共5页Soil Engineering and Foundation

摘　　要：深入研究注浆钢管加筋复合体系在深厚填土基坑支护中的应用实例,对注浆施工过程的成孔方式、浆液配比、注浆量计算、注浆压力确定等内容提出一般性原则;通过室内浆液试验,发现水玻璃溶液能有效控制浆液粘度的作用,在一定比例条件下浆液粘度呈近似线性规律增加;利用强度折剪法验算钢管施加前后基坑安全性系数,表明钢管加筋体在提高基坑开挖过程安全性方面具有重要作用。With the urbanization of cities, more and more construction related concerns, such as, lack of construction space, in- terfering with underground utilities and lack of sufficient tool characterizing the newly filled soils, become increasingly impor- tant. Facing these problems, the traditional approaehes to the design and construction will likely lead to an unneeessarily con- servativism, longer construction period and high cost in order to address the safety issues during the construction. This paper presents a case study of using the grouted steel tube reinforcement as the supporting system of a deep excavation in the newly filled soil layers. The guidelines for the borehole advancement, water ratio of the grouting slurry, grout quantity and the grou- ting pressure are discussed in the paper. Throughout the laboratory testing, it is concluded that the liquid glass solution can ef- fectively adjust the viscosity of the grouting slurry. The viscosity of the grouting slurry is approximately proportional to the eontent of the liquid glass. The global stability of the excavation supporting system can be checked with strength reduction method.

关 键 词：双液注浆 注浆钢管 深厚填土 基坑工程 

分 类 号：TU473[建筑科学—结构工程]