隧道深部围岩薄弱区定域控制注浆技术及应用  

Grouting technology and application of the Orientation grouting in weak area of surrounding rock tunneling

作　　者：潘光明[1] 郑东柱 

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250012

出　　处：《山东大学学报（工学版）》2016年第1期49-55,61,共8页Journal of Shandong University（Engineering Science）

基　　金：国家自然科学基金资助项目(41272385);高等学校博士学科点专项科研基金资助项目(20130131110032);国家青年科学基金项目资助项目(51209128)

摘　　要：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。Orientation grouting technology was proposed to solve the problem of poor grouting effect and higher grouting risk of weak surrounding rock. Reliable data of intensity resistance and pressure resistance were acquired by safety experiment of orientation grouting device. The maximum grouting ending pressure,which could assure the reinforce demand of weak surrounding rock,was acquired by safety grouting ending pressure experiment. Grouting material proportioning and safety and initial setting time were acquired by initial setting time experiment of Grouting material. The results showed that the swell stopper could resist at 12 MPa grouting pressure when the safety filling pressure of swell stopper was 1. 5 MPa. Under the condition of non-pressure,the cross section of grouting was 1. 0 - 1. 2 times of the cross section of grouting pipe. Safety grouting ending pressure was between initial reinforce strength and again splitting pressure,approximately 2. 5 - 3. 0 MPa. It was safe when the grouting material proportioning was between 1 ∶ 1 - 2 ∶ 1and initial setting time was between 150 - 300 s. Orientation grouting technology could meet the safety separate-pressure demand,and controll the grouting diffusion range.

关 键 词：超前帷幕注浆 隧道围岩 薄弱区 定域控制注浆 膨胀止浆塞 

分 类 号：U453.61[建筑科学—桥梁与隧道工程]