锚杆表面肋参数对锚固性能影响及优化OA
Influence of surface rib parameters of bolts on anchoring performance and optimization
煤炭深部开采围岩锚杆支护结构面临高地温、地下水等复杂地质条件的影响,失锚导致的围岩变形破坏时有发生,因此提升锚杆锚固性能非常重要.首先,分析锚杆受轴向荷载作用时任意锚固段5个阶段的应力状态,阐明不同阶段锚固界面切应力形式,建立锚杆表面肋参数细化的锚固界面力学模型,推导出考虑地温或地下水影响的锚固界面破坏判定式并进行验证;其次,进行锚杆表面肋参数对锚固力影响因素分析与界面直剪试验,得出锚杆肋角度增加及合理的肋间距可增加锚固力.为减少轴力在锚固界面上的剪切分力,锚杆肋面角不应小于70°,若锚固剂自身强度高可增加锚杆表面肋间距(可取24 mm以上).最后,提出深部复杂地层锚杆锚固性能提升方法,为类似地层巷道围岩安全高效支护提供技术参考.
Deep coal mining rock support structures using rock bolts face complex geological conditions such as high ground temperatures and groundwater.Rock mass deforma-tion and failure caused by bolt failure frequently occur,making it crucial to enhance the anchoring performance of rock bolts.First,the stress state of the anchor rod under axial loading across five stages of any anchored segment is analyzed.The shear stress patterns at the anchoring inter-face during different stages are elucidated.A refined me-chanical model of the anchoring interface incorporating sur-face rib parameters is established.A failure criterion for the anchoring interface under the influence of ground tempera-ture or groundwater is derived and validated.Second,the influence of anchor rib parameters on anchoring force is aba-lyzed,and in-situ shear tests are conducted.Results indi-cate that increasing the rib angle and optimizing rib spacing can enhance anchoring force.To minimize the shear compo-nent of axial force at the anchor interface,the rib angle of the anchor bolt should not be less than 70°.When the an-chor grout possesses high inherent strength,the spacing be-tween ribs on the anchor bolt surface may be increased(to 24 mm or greater).Finally,methods for enhancing the an-choring performance of bolts in deep complex strata are pro-posed,providing technical references for the safe and effi-cient support of tunnel rock masses in similar geological conditions.
刘小虎;杨勇;姚直书;查文华;习燕琪;王佳奇
安徽理工大学土木建筑学院,淮南 232001||东华理工大学核资源与环境国家重点实验室,南昌 330013||安徽理工大学矿山地下工程教育部工程研究中心,淮南 232001安徽理工大学土木建筑学院,淮南 232001安徽理工大学土木建筑学院,淮南 232001东华理工大学核资源与环境国家重点实验室,南昌 330013||东华理工大学土木与建筑工程学院,南昌 330013东华理工大学核资源与环境国家重点实验室,南昌 330013||东华理工大学土木与建筑工程学院,南昌 330013安徽理工大学土木建筑学院,淮南 232001
矿业与冶金
岩土工程锚固支护锚固界面树脂锚固剂表面肋参数锚固性能优化
geotechnical engineeringanchorage supportanchorage interfaceresin anchoring agentsurface rib pa-rametersanchorage performance optimization
《东南大学学报（英文版）》 2026 (1)
100-111,12
The Natural Science Research Project of Anhui Edu-cational Committee(No.2022AH050814),Open Fund of State Key Laboratory of Nuclear Resources and Environment(East China Univer-sity of Technology)(No.2022NRE07),the National Natural Science Foundation of China(No.51964002,52174104),Open Fund of Engi-neering Research Center of Underground Mine Construction of Minis-try of Education(No.JYBGCZX2022105).
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