摘要
本文基于后注浆的全长预应力锚注支护工艺,并通过对FLAC3D软件中内嵌PILE结构单元修正,提出了全长预应力锚注支护数值模拟方法。在此基础上,开展了地应力、原岩强度等级、支护构件长度、布设间距、注浆强化指数与预应力6种因素下巷道围岩控制效果数值模拟对比研究,揭示了各类因素对围岩变形量、塑性区演化的影响规律,构建了全长预应力锚注支护下控制效果敏感性评价指标,将影响因素依次划分为围岩强度、地应力、锚注支护构件设计3个层级,并根据各因素敏感性层级给出了工程措施建议。最后,以现场典型软弱破碎地层巷道为工程依托,研发了具有强度高、可施加预应力等优势的组合式高强注浆锚杆与高强中空注浆锚索。通过现场应用,验证了全长预应力锚注支护可有效增强软弱破碎围岩自承载能力,充分发挥锚固构件的支护潜力,限制巷道围岩变形破坏。
This study proposed the numerical simulation method of full-length prestressed anchor grouting support based on the post-grouting technology,and the modification of the embedded PILE structural unit in FLAC3D software.Specifically,we conducted the numerical simulation and made comparison in terms of the control effect of roadway surrounding rock under six types of factors:ground stress,strength grade of original rock,length of supporting members,layout spacing,grouting strengthening index and prestress,with the aim to reveal how these factors affect the deformation of surrounding rock and the evolution of plastic zone.Then,we proposed the sensitivity evaluation index of control effect under full-length prestressed anchor grouting support.The influencing factors are divided into 3 levels:strength of surrounding rock,ground stress and design of bolt-grouting support members.Suggestions for engineering are also given according to the sensitivity level of each factor.Finally,the combined high-strength grouting bolt and high-strength hollow grouting cable are developed based on a typical roadway in weak broken strata.It can effectively enhance the self-carrying capacity of weak broken surrounding rock,give full play to the supporting potential of anchoring members,and limit the deformation and failure of roadway surrounding rock.Through the field application,the full-length prestressed bolt-grouting support is verified.
作者
王洪涛
高广龙
张红军
李建建
解学磊
赵万里
WANG Hongtao;GAO Guanglong;ZHANG Hongjun;LI Jianjian;XIE Xuelei;ZHAO Wanli(School of Civil Engineering,Shandong Jianzhu University,Jinan Shandong 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering(Shandong Jianzhu University),Ministry of Education,Jinan Shandong 250101,China;Shandong Institute of Geological Sciences,Jinan Shandong 250013,China;Shandong Anke Mine Support Technology Co.,Ltd,Jinan Shandong 250033,China)
出处
《矿业科学学报》
CSCD
北大核心
2024年第1期53-65,共13页
Journal of Mining Science and Technology
基金
国家自然科学基金(52374093)
中国博士后科学基金(2022M711314)
山东省自然科学基金(ZR2022ME088)。
关键词
全长预应力锚注
巷道
数值模拟
敏感性
控制效果
full-length prestressed bolt-grouting
roadway
numerical simulation
sensitivity
control effect
