论文部分内容阅读
使用永莲隧道F2断层介质,预置单一结构面,基于不同结构面角度、水泥单液浆水灰比和注浆压力开展正交试验.试验表明:注浆压力、土压力和渗透压力均呈波动上升规律,但土压力和渗透压力相对较小;结构面α=0°、45°和90°试样在注浆后强度分别提升了189%,200%和64%,结构面α=45°试样加固前后强度均较低;应力-应变曲线显示,当应变达到0.015~0.04时,应力达到峰值;通过极差分析,本次试验条件下结构面角度是影响试样抗压强度的主控因素,其次为浆液水灰比,注浆压力影响最小;浆液充填结构面并劈裂断层介质形成的大尺寸浆脉发挥骨架效应,对加固体破坏产生控制性作用;揭示了水泥单液浆对于含结构面断层介质的充填、挤密和劈裂联合加固型式.从加固型式、加固效果和主控加固因素3个方面对比了水泥单液浆和C-S双液浆对于断层介质的加固特性.单液浆形成的浆脉尺寸更大;当α=0°和90°时,单液浆加固效果更佳,而α=45°时,双液浆加固效果更优.与单液浆不同,双液浆的主控因素为浆液配比.基于试验结论为注浆设计和施工提出了4条指导性建议.
An orthogonal experiment was carried out on the F2 fault medium in Yonglian Tunnel with single structural plane pre-set, and based on the different structural plane angles, the cement-water slurry ratio and the grouting pressure, the results showed that grouting pressure, earth pressure and infiltration pressure But the soil pressure and the infiltration pressure are relatively small. The strength of the specimens with the α = 0 °, 45 ° and 90 ° of the structural surface increases by 189%, 200% and 64%, respectively, and the structural surface α = 45 ° stress before and after strengthening are lower; stress - strain curve shows that when the strain reaches 0.015 ~ 0.04, the peak stress; through the analysis of range, the test conditions under the structural surface angle is the main impact of compressive strength of the sample Controlling factors, followed by slurry water-cement ratio, have the least effect on grouting pressure. Large-size slurry formed by filling the structural plane and splitting the fracture medium exerts a skeletal effect that exerts a controlling effect on the solidification failure. For the combination of filling, compaction and splitting of fault-bearing media with structural plane, the reinforcement characteristics of single-grout and CS dual-grout for fault media are contrasted from three aspects of reinforcement type, reinforcement effect and main control reinforcement. Slurry formed by a single slurry When α = 0 ° and 90 °, the reinforcement effect of single slurry is better, and when α = 45 °, the reinforcement effect of double slurry is better.Different from single slurry, the main controlling factor of double slurry For the slurry ratio.According to the test results for the grouting design and construction made four guiding suggestions.