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为解决围岩深部注浆薄弱区加固效果差和存在较大注浆操作风险的难题,提出了定域控制注浆技术。通过对定域注浆器的安全性试验,取得了定域注浆器的抗破坏和止浆后的密闭抗压性可靠数据;通过对薄弱区的安全注浆终压选择试验,获得了满足薄弱区注浆加固质量要求的最大安全注浆终压参数;通过注浆材料及其混合浆液的初凝时间试验,获得了适合定域控制注浆要求的浆液配合比及其安全注浆初凝时间。试验结果表明:膨胀止浆塞的安全充填压力为1.5 MPa,止浆后能抵抗12 MPa的注浆压力;无压状态下溢流孔全部均匀出浆时其总过浆面积应为注浆管内径面积的1.0~1.2倍;薄弱区的安全注浆终压应选在其初期加固后的现实强度和再次劈裂压强之间,为2.5~3.0 MPa;基浆试验密度下配比范围为1∶1~2∶1,初凝时间为150~300 s是安全有效的。定域控制注浆技术在对深部围岩薄弱区的注浆加固中能达到安全隔压、控制浆液进行定域注浆的目的,能较好地解决相关技术难题。
In order to solve the problem of poor reinforcing effect of deep grouting in surrounding rock and the risk of large grouting operation, a localized control grouting technology was proposed. According to the safety test of the grouting device, the reliable data of the anti-sabotage of the grouting grout and the confined compressive strength after grouting were obtained. Through the selection test of the final grouting pressure in the weak zone, The maximum safe grouting final pressure parameters required for the grouting reinforcement in the weak zone are obtained. Through the initial setting time test of the grouting material and its mixed slurry, the mixing ratio of the grout suitable for the localized grouting and the initial setting of its safety grouting time. The test results show that the safety filling pressure of the expansion plug is 1.5 MPa, and the grouting pressure can be resisted at 12 MPa after the grouting. Under the condition of no pressure, the total slurry area of the overflow hole should be grouting pipe The inner diameter of the area of 1.0 to 1.2 times; the safe end of the weak grouting should be selected in the initial reinforcement after the actual strength and re-splitting pressure between 2.5 ~ 3.0 MPa; Base grouting density test range of 1 : 1 ~ 2: 1, the initial setting time of 150 ~ 300 s is safe and effective. The grouting technology of localized control can achieve the safety of the pressure grouting in the weak area of deep surrounding rock and control grouting for grouting. It can solve the related technical problems well.