厚卵砾漂石地层注浆止水新型材料注浆效果试验研究

在富水厚卵砾漂石地层中,采用传统的注浆浆液进行止水,浆液极易在地层内大量流失,且注浆后浆液扩散不均、多呈"糖葫芦"状扩散,无法保证注浆效果。针对富水厚卵砾漂石地层的地质特点,针对注浆材料进行一系列室内配比试验,并通过注浆模型试验及现场试验进行卵砾漂石地层的注浆材料研究。试验表明:在厚卵砾漂石地层中,采用2种新型浆液即CD-SCA(水泥+聚羧酸钠盐型分散剂-水玻璃+硫酸铜+明矾)浆液和PC-SCA(磷酸-水玻璃+硫酸铜+明矾)浆液,注浆浆液呈柱状均匀扩散,扩散半径满足设计要求,地层的渗透性明显改善,满足了帷幕止水墙的止水效果,为今后同类地层注浆止水工程施工提供了有效借鉴。

Experimental Study on Selection and Grouting Effect of New Grouting Materials Applied in Thick Water-rich Sandy Gravel Strata

When conventional grout is injected in thick water rich sandy gravel strata, problems, such as grout loss in strata and uneven diffusion of grout, will occur, which will weaken the water proof effect greatly and cannot guarantee the grouting effect. In the paper, a series of grout mixing tests are conducted in the laboratory, and model tests and field tests are made on the grouting for sandy gravel strata, based on the geological characteristics of the thick water rich sandy gravel strata. Conclusions drawn are as follows: two new grouts, i.e., CD SCA grout and PC SCA grout，are suitable for thick water rich sandy gravel strata. When these grouts are injected, they spread evenly in columnar diffusion, the diffusion radius can meet the design requirements, the penetration of the grouts are improved significantly, and the water sealing requirements of the waterproof curtain wall are satisfied. The paper can provide reference for the grouting in similar strata in the future.