(1. 河南理工大學(xué) 能源科學(xué)與工程學(xué)院，焦作 454003；
2. 河南理工大學(xué) 深井瓦斯抽采與圍巖控制技術(shù)國家地方聯(lián)合工程實驗室，焦作 454003；
3. 河南理工大學(xué) 煤炭安全生產(chǎn)與清潔高效利用省部共建協(xié)同創(chuàng)新中心，焦作 454003)
摘 要: 采用不同強度的水泥砂漿塊模擬均質(zhì)性較好巖性不同的巖體，開展承壓注漿加固含弱面巖體時的巖-漿抗剪強度耦合機理研究，探索承壓注漿加固效果的評價機制。結(jié)果表明：承壓注漿加固可有效提高含弱面巖體的抗剪強度，并延緩含弱面巖體宏觀破壞的發(fā)生；含弱面巖體抗剪強度隨法向應(yīng)力的增大呈線性趨勢增加，隨著注漿材料強度的增強呈對數(shù)函數(shù)趨勢增加，且抗剪強度參數(shù)(τ、c、φ)都隨注漿材料強度和巖體基體強度比值的增大呈先增大后減小的趨勢變化；含弱面巖體黏聚力隨注漿材料強度、巖體基體強度的增加呈線性增加，內(nèi)摩擦角卻隨注漿材料強度的增加而減小，隨巖體基體強度的增加維持穩(wěn)定。試驗驗證了基于巖-漿抗剪強度耦合機理建立的承壓注漿加固含弱面巖體效果評價準則能有效判定承壓注漿加固的最優(yōu)效果，可用于指導(dǎo)含弱面巖體注漿加固控制工程。
關(guān)鍵字: 承壓注漿；含弱面巖體；抗剪強度；耦合機理；評價準則
（1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;
2. State and Local Joint Engineering Laboratory for Gas Drainage and Ground Control of Deep Mines, Henan Polytechnic University, Jiaozuo 454003, China;
3. Collaborative Innovation Center of Coal Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454003, China）
Abstract:By using cement mortar blocks with different strengths to simulate the rock masses with good homogeneity and different lithology, the coupling mechanism of rock-slurry shear strength of weak-faced rock mass under pressure grouting for reinforcement was researched to explore the evaluation mechanism of pressure grouting for reinforcement effect. The results show that the pressure grouting for reinforcement can improve shear strength and delay the macroscopic failure of weak-faced rock mass effectively. The shear strength of weak-faced rock mass expresses a linear growth with the increasing normal stress, and it rises in a logarithmic function with increase the strength of grouting material, moreover, the shear strength parameters (τ, c, φ) first increase and then decrease as the ratio of grouting material strength and rock mass strength adds. The cohesive force of weak-faced rock mass adds linearly with the enhancive grouting material strength and rock mass strength, while the internal friction angle declines with increasing the grouting material strength, and it remains constant as the rock mass strength enhances. Based on the coupling mechanism of rock-slurry shear strength, the evaluation criteria for effect of weak-faced rock mass under pressure grouting for reinforcement is able to determine effectively the optimal effect of the pressure grouting for reinforcement. This point was verified, and it can be used to guide the control project of grouting reinforcement of weak-faced rock mass.
Key words: pressure grouting; weak-faced rock mass; shear strength; coupling mechanism; assessment criteria
