高压动水粉细砂层充填型溶洞注浆材料研究

研究目的:圆梁山隧道2#溶洞为高压动水粉细砂层充填型溶洞,该类溶洞在国内外工程施工中尚未遇 到,无成功的经验可以借鉴。本文通过大量的理论及实践,以研究该类型溶洞的注浆材料,从而解决该溶洞的注 浆施工。 研究方法:在2#溶洞下导坑施工中,采用普通水泥-水玻璃双液浆和超细水泥-水玻璃双液浆注浆,十分艰 难地通过了溶洞。随后,平导又遇到溶洞后,采用双液浆未达到良好的注浆效果,调整注浆材料,引入普通水泥 单液浆和超细水泥单液浆,形成组合式沣浆材料。组合式注浆材料提高了平导的注浆效果,但在地表降雨后,注 浆固结体仍被高压水“击穿”,造成注浆失效。经过认真总结注浆的经验与教训,又引入TGRM浆和HSC浆,形 成6种注浆材料配套体系及选择模式。 研究结果:6种注浆材料配套体系较好地解决了随后圆梁山隧道2#高压动水粉细砂层充填型溶洞平导与 正洞的注浆难题。 研究结论:采用普通水泥单液浆、超细水泥单液浆、普通水泥-水玻璃双液浆、超细水泥-水玻璃双液浆、 TGRM浆、HSC浆6种注浆材料组合体系,采取合理的工艺模式,能较好地加固高压动水粉细砂层充填型溶洞, 确保工程的安全顺利施工。

RESEARCH ON GROUTING MATERIALS FOR FILLING KARST CAVE WITH HIGH-PRESSURE HYDRODYNAMIC SILT LAYER

Research purpose: Karst Cave 2 of Yuanliangshan Tunnel is a filling karst cave with high-pressure hydrodynamic silt layer. No such kind of cave has been found in all constructions of tunnel at home and abroad, so there is no successful experience to learn. The research is made on grouting materials for such kind of cave by application of many theories and doing lots of practices in this paper in order to solve the problem of grouting engineering. Research method: Ordinary concrete-water glass two-shot grouting and extra fine concrete-water glass two-shor grouting are adopted in construction of the pilot tunnel under karst cave 2. By this way, it is difficult to pass through one cave. Following it, after the level pilot tunnel encounters karst cave, two-shot grouting is adopted, but the result is not good. To such situation, the grouting materials are adjusted and ordinary concrete one-shot grouting and extra fine concrete one-shot grouting are introduced to form group grouting materials. The group grouting materials increase the grouting effects for level pilot tunnel. But after it rains on earth surface, the grouting solidification is broden down by high-pressure water and cause failure of grouting. Through summing up the experiences and learning lessons, TGRM grouting and HSC grouting are introduced to form a complete set of system and selected model with six kinds of grouting materials. Research result: The grouting problem of level pilot tunnel and main cave of filling karst cave 2 with high-pressure hydrodynamic silt layer is solved by the complete set of system with six kinds of grouting materials. Research conclusion: With national technique, the reinforcement of fdling karst cave with high -pressure hydrodynamic silt layer can be well done and engineering for it can be kept going smoothly by adopting the complete set of system with six kinds of grouting materials of ordinary concrete one-shot grouting, extra fine one-shot grouting, ordinary concrete-water glass two-shot grouting, extra fine concrete-water glass two-shot grouting, TGRM grouting and HSC grouting.