摘要
灌注桩和地下连续墙是构成深基坑工程的重要组成部分,不仅承担逆作法基坑围护施工期的水土压力和施工荷载,还承担使用期的主体结构荷重。但由于施工工艺因素,质量难以准确控制,工程中多采用后压浆技术进行补强,合理的后压浆方案能够改善桩和墙底部沉渣层和持力层的岩土力学性能,解决沉渣厚与持力层软化问题,达到提高承载力和稳定性、减少差异沉降和总沉降、协调桩-墙共同作用,同时提高隔渗止水效果,因此工程应用中对后压浆加固效果的质量控制和检测尤其重要。结合具体工程实践,对深基坑工程中后压浆技术的应用和检测进行分析探讨,验证后压浆技术及其检测方法是有效可行的。
As main parts of deep foundation pit engineering, bored piles and diaphragm walls embedded in rocks bear on not only the lifetime structural weight but also water and soil pressure, and construction load during reverse-process. But their quality is hard to control for the inherent construction process. A reasonable program of posterior grouting technique usually can improve performance of fragmented concrete of piles and walls, thick sediment at the end of piles and walls, as well as fragmented rock of bearing stratum, then, increase bearing capacity and stability, reduce differential and total settlements, coordinate combined-action of piles-walls and enhance effect of water prevention and leakage isolation. So it is important to control and detect quality of the posterior grouting. Based on the specific application and field tests, posterior grouting technique and detection methods are proved to be effective and practicable in foundation-pit engineering.
出处
《建筑科学》
北大核心
2010年第1期85-89,共5页
Building Science
基金
福建省自然科学基金项目(D0740003)
青年科技基金项目(2005J052)
关键词
基坑工程
地下连续墙
后压浆技术
质量检测
foundation pit engineering
diaphragm wall
posterior grouting technique
quality detection
