Development and application of a new comprehensive grouting reinforcement test system
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摘要: 針對現有注漿加固試驗裝置難以平衡高壓注漿所需密封效果和多功能試驗所需空間結構的缺點,研制了一套新型多功能綜合注漿加固試驗系統.該試驗系統的優點為:(1)尺寸適中、結構合理,既具有布設監測元件的試驗空間又具有良好的密封效果;(2)適用范圍廣,可針對不同巖土體介質開展多類注漿加固試驗;(3)具備多元物理信息并行采集功能;(4)可同時滿足加固體宏觀物理力學性質測試及漿-巖界面微觀耦合機制的研究需求.該系統成功應用于斷層角礫介質注漿加固室內模擬試驗,分別從應力響應-傳遞特征、加固體強度增長規律及加固模式等方面探究了斷層角礫介質的注漿加固機理,提出了角礫介質強度增長的經驗公式,揭示了加固過程中注漿壓力的傳遞分配機制.Abstract: Existing grouting test devices have difficulty providing sufficient sealing effect and experimental space in multifunctional tests. Due to the limitations of current devices, this paper developed a new comprehensive grouting reinforcement test system. The major advantages of this system include:(1) its moderate size and reasonable structure that offer a large experimental space and good sealing property; (2) its ability to simulate the different groundwater environments and grouting conditions of rock soil media; (3) its ability to obtain a variety of physical information for researching the space-time response law of reinforcement parameters; and (4) its ability to simultaneously test the compressive and shear strengths of the solid and microscopic grouting coupling mechanisms of the slurry-rock interface. An orthogonal grouting reinforcement test was designed for fault breccia using the new device. The study then investigated the grouting reinforcement mechanism of fault breccia with respect to the stress response-transfer characteristics, the growth law of solid strength, and the reinforcement mode. The test results show fault breccia to be mainly reinforced by permeation grouting and the grouting reinforcement model can be divided into three types-substrate, micro-splitting, and significant splitting. The study achieved an increase in the strength of grouting reinforcement bodies by changing the medium connection mode and fitted the empirical formula for the increased strength of solid grouting. It also determined the distribution and transfer mechanism of grouting pressure.
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Key words:
- test system /
- fault breccia /
- grouting reinforcement /
- indoor simulation test /
- grouting pressure
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參考文獻
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