无压力注浆隔水地基处理施工技术研究

Research on Construction Technology of Foundation Treatment Based on Non-Pressure Grouting Waterproofing

结合工程实际,介绍了一种通过无压力注浆进行基坑隔水的一种地基处理施工方法。通过孔位设计,无压力注浆隔水的方式,对施工场地进行地基处理,将地下水隔离,可实现地下工程无水施工;止水后经水压实验,基坑底部达到隔水层要求的,按照设计规范可以取消抗浮设计措施。在实际工作中,对无压力注浆在基坑隔水施工中的应用进行了尝试,通过注浆孔位置设计和注浆顺序,将水位较高的地下水区域从透水能力强的部位引至透水能力弱的部位,并形成隔水层达到降水的目的。并研究了基坑使用无压力注浆隔水降水的可行性。

Combined with engineering practice,the paper introduces a construction method of foundation treat⁃ment for foundation pit waterproofing by pressure-free grouting.Through the design of a bolehole site,a pressurefree grouting waterproofing method is used to treat foundations at the construction site to isolate groundwater,which can achieve water-free construction for underground projects.After waterproofing,through a hydraulic test,if the bottom of a foundation fit meets the requirements of water-resisting layers,anti-floating design measures can be canceled according to design specifications.In actual work,the application of pressure-free grouting in the construction of foundation pit waterproofing is tried,a groundwater area with a high water level is led from a part with strong permeability to a part with weak permeability through the borehole site design and sequence of grout⁃ing to form an aquifer to achieve the purpose of declining water,and the feasibility of isolating water and declining water in foundation pits by pressure-free grouting is also studied.