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。 Cast-in-place piles and underground diaphragm walls constitute an important part of the deep foundation pit project. They not only undertake the water and soil pressure and construction load during the construction of the foundation pit under the counter-action, but also bear the load of the main structure during the service period. However, due to the construction process factors, the quality is difficult to accurately control, the project often use post-grouting technology to reinforce the reasonable post-grouting program can improve the pile and wall bottom sediment layer and bearing layer of rock and soil mechanical properties to solve the sediment thickness And the holding layer to soften the problem, to improve the carrying capacity and stability, reduce differential settlement and total settlement, coordinate the pile-wall interaction, while improving the effect of seepage and sealing water, so engineering application of post-grouting reinforcement effect of quality control And testing is especially important. Combined with specific engineering practice, the application and testing of post-grouting technology in deep foundation pit engineering are analyzed and discussed. It is feasible and effective to verify the post-grouting technology and its testing methods.