The application of grouting reinforcement to the broken surrounding rock of 1366 stoping roadway
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摘要: 针对1366工作面回采巷道中围岩破碎的问题和巷道变形量大、底鼓、支护失效等现象，设计了巷道全断面分次注浆加固方案及渗透注浆工艺，确定了合理的注浆压力和浆液扩散半径。通过数值模拟对注浆前后围岩应力、塑性区分布、表面位移情况进行注浆加固效果预测。现场应用和监测表明：采用全断面分次注浆方案对回采巷道进行注浆加固后，巷道变形量大幅度缩小、巷道受力均匀、应力集中降低，与数值模拟结果基本一致。注浆加固方案有效加固了1366回采巷道围岩，控制了巷道围岩的稳定性，可为相似条件下巷道围岩控制提供参考。Abstract: This study proposes a fractional grouting reinforcement scheme of the roadway with full section to tackle surrounding rock breakage in the stoping roadway of 1366 working face and roadway deformation, floor heave and support failure.The infiltration grouting process is adopted to determine reasonable grouting pressure and grout diffusion radius for full section reinforcement.The stress, plastic zone distribution and surface displacement of surrounding rock before and after grouting are forecast through numerical simulation.Field application and monitoring show that: after the full section fractional grouting scheme is used to reinforce the mining roadway, the roadway deformation is considerably reduced, the roadway force is balanced, and the stress concentration is alleviated, which is basically consistent with the numerical simulation results.The grouting reinforcement scheme works to strengthen the surrounding rock of 1366 mining roadway, maintain the stability of surrounding rock of roadway, and provided references for the control of surrounding rock of roadway under similar conditions.
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表 1 注浆工程量统计
Table 1. Grouting quantities
施工类别 施工长度/m 注浆孔数/个 水泥量/t 外加剂量/t 第一次注浆 290 755 196.5 19.65 第二次注浆 290 501 80.2 8.02 
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表 2 注浆前煤岩参数(岩层自上而下)
Table 2. Parameters of coal and rock before grouting(Strata from top to bottom)
岩性 体积模量/GPa 剪切模量/GPa 内摩擦角/(°) 黏聚力/MPa 抗拉强度/MPa 粉砂岩 18.57 13.6 35 8.8 1.70 中砂岩 17.57 17.6 34 9.1 1.70 砂砾岩 19.57 19.8 33 9.9 1.90 水泉1层 3.057 1.5 34 0.81 0.16 细砂岩 18.57 19.6 33 9.9 1.90 水泉2层 3.057 1.5 34 0.81 0.16 粉砂岩 16.57 12.6 35 8.8 1.70 水泉3层 3.057 1.5 34 0.81 0.16 细砂岩 18.57 19.6 33 9.9 1.90 粉砂岩 1.657 12.6 35 8.8 1.70 页岩 94.57 6.96 40 3.8 0.75 砂砾岩 19.57 19.8 33 9.9 1.90
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表 3 注浆材料抗压强度
Table 3. Grouting strength of grouting material
时间/d 1 3 7 14 28 强度/MPa 5.0 7.4 18.6 22.8 25.0
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表 4 锚杆(索)最大受力统计表
Table 4. Maximum stress of bolt(cable)
MPa 位置 断面1 断面2 断面3 断面4 断面5 断面6 平均 顶板 63 67 0 74 65 27 59.20 左帮 35 39 16 22 15 37 27.33 右帮 14 59 36 0 0 16 31.25
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表 5 顶、底板相对位移测试数据
Table 5. Relative displacement test data of roof and floor
时间/d 位移/mm 断面1 断面2 断面3 断面4 断面5 断面6 0 0 0 0 0 0 0 6 0 7 7 0 0 0 12 8 14 48 0 0 0 18 19 20 31 5 15 13 24 26 31 43 11 25 22 30 31 39 49 17 28 27 36 39 40 52 25 37 30 42 39 42 53 32 44 35 48 40 47 55 33 42 40 54 40 54 57 35 43 47 60 41 56 58 34 49 43
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表 6 两帮相对位移测试数据
Table 6. Relative displacement test data of two sides
时间/d 位移/mm 断面1 断面2 断面3 断面4 断面5 断面6 0 0 0 0 0 0 0 6 15 10 12 0 0 0 12 20 18 19 0 0 0 18 27 23 25 15 15 20 24 31 24 34 23 48 32 30 40 26 48 42 65 56 36 49 33 59 55 82 62 42 55 42 66 60 89 68 48 58 50 71 66 94 72 54 72 58 82 73 101 78 60 80 79 90 83 103 92
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