一种新型中空注浆锚杆止浆塞的优化设计与试验研究  

Optimization Design and Experimental Study of a New Type of Hollow Grouting Anchor Rod Stopper Plug

作　　者：谢壁婷 肖明清[1,2] 徐晨 田青峰 王克金 XIE Biting;XIAO Mingqing;XU Chen;TIAN Qingfeng;WANG Kejin(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;National and Local Joint Engineering Research Center of Underwater Tunneling Technology,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]水下隧道技术国家地方联合工程研究中心,武汉430063

出　　处：《铁道标准设计》2024年第10期143-149,168,共8页Railway Standard Design

基　　金：国家自然科学基金项目(52279118);中国铁建股份有限公司科技研发课题(2021-B18)。

摘　　要：锚杆在隧道施工中应用广泛,对于提高围岩自承能力,减小结构受力效果显著,中空注浆锚杆经过注浆后可以大幅提高其支护效应,注浆质量直接影响中空锚杆的承载能力。基于一种新型中空注浆锚杆止浆塞,通过数值模拟对其构造形式和结构尺寸进行优化设计研究,并通过室内模型试验和现场试验对研发的新型止浆塞的排气稳压效果进行检验。结论如下:止浆塞最优尺寸为内塞排气槽上端宽8.0 mm,深1.5 mm,下端宽11.3 mm,深1.0 mm;闭气坎高度为3 mm;外塞孔口端直径为51 mm,远离孔口端直径为50 mm。止浆塞对不同锚杆孔孔径具有普适性,当止浆塞与锚杆孔相差0~4 mm时,均能满足其稳压止浆性能要求。试验结果表明,新型止浆塞稳压压力在0.7~1.2 MPa之间,锚杆孔内浆液充盈,浆液密实,止浆效果明显。Anchor rods are widely used in tunnel construction to significantly improve the self-supporting capacity of surrounding rock and reduce structural stress.Hollow grouting anchor rods can greatly enhance their support effectiveness after grouting,and the quality of the grouting directly affects the load-bearing capacity of these rods.This study focused on the optimization design of a newly developed type of hollow grouting anchor rod stopper plug by conducting numerical simulations to refine its structural form and dimensions.The exhaust pressure stabilization effect of the newly developed stopper plug was tested through indoor model experiments and field trials.The results showed that the optimal dimensions for the stopper plug were an upper exhaust groove width of 8.0 mm and depth of 1.5 mm,a lower groove width of 11.3 mm and depth of 1.0 mm,an air-tight ridge height of 3 mm,and an outer stopper plug diameter of 51 mm at the opening and 50 mm at the far end.The grouting stopper plug was adaptable to various anchor rod hole diameters,and when the difference between the stopper plug and the anchor hole was 0~4 mm,it met the requirements for pressure stabilization and grouting performance.The experimental results showed that the stabilizing pressure of the new grouting stopper plug was between 0.7 and 1.2 MPa,with the anchor rod hole being fully filled and the grout compacted,demonstrating a significant grout-stopping effect.

关 键 词：隧道工程 中空注浆锚杆 止浆塞 排气稳压 优化设计 注浆测试 

分 类 号：U25[交通运输工程—道路与铁道工程] U455[建筑科学—桥梁与隧道工程]