岩土力学2025，Vol.46Issue(11)：3395-3409,15.DOI:10.16285/j.rsm.2024.1508
考虑锚杆滞后支护的竖井围岩加固力学模型半解析研究
Semi-analytical study on mechanical model of vertical shaft surrounding rock reinforcement considering the lagging support of anchor bolts
摘要
Abstract
The energy development projects in western China require the construction of a large number of vertical shafts in weakly cemented gravel layers with poor stability.Anchor rod support is an important means of controlling the deformation of surrounding rock.However,most of the current theories on anchor reinforcement have overlooked the lagging support of anchor rods.Therefore,based on the spatial constraint effect of the working face,elastic-plastic theory,and the anchor rod stress uniform distribution method,this study proposes a semi-analytical calculation method for the deformation and stress of the surrounding rock of vertical shaft anchor bolts considering the lag support of anchor bolts.The correctness of this method was verified by finite element method.Based on the proposed semi analytical solution,the influence of anchor parameters was further explored.The research results show that the larger the lag distance of the anchor rod,the greater the deformation of the surrounding rock,and the smaller the surrounding rock pressure borne by the anchor rod and other supporting structures.When the lag distance xgs of the anchor rod is less than 1.5rA(rA represents the excavation radius of the vertical shaft),the deformation ur(r=rA)and safety factor s of the surrounding rock change greatly.When the lag distance xgs of the anchor rod is greater than 3.0rA,the deformation ur(r=rA)and safety factor s of the surrounding rock remain basically unchanged.Increasing the diameter of the anchor rod improves the shear strength,but the impact gradually decreases.When the length of the anchor rod L is less than 1.0rA,the deformation of the surrounding rock ur(r=rA)and the safety factor s change greatly.When the length of the anchor rod L is greater than 1.0rA,the change is slow,so it is not recommended to excessively use long anchor rods.Research suggests that when selecting support parameters,consideration should be given to the support lag distance to ensure the stability of the surrounding rock.This study successfully applied this theory to the vertical shaft engineering of pressure pipelines,and the research results provide a solid theoretical basis for the design of anchor rod support for the surrounding rock of the vertical shaft.关键词
竖井支护/锚杆滞后支护/滞后支护距离/应力均布法Key words
vertical shaft support/anchor rod lag support/lag support distance/stress distribution method分类
建筑与水利引用本文复制引用
张基伟,张佳鑫,马文著,贾红学,吴卫东,王传宝..考虑锚杆滞后支护的竖井围岩加固力学模型半解析研究[J].岩土力学,2025,46(11):3395-3409,15.基金项目
兵团财政科技计划资助(No.2023 AB016-02) （No.2023 AB016-02）
陕西省重点研发计划(No.2024GX-YBXM-479).This work was supported by Financial Science and Technology Program Funding for the Corps(2023 AB016-02)and the Key Research and Development Program of Shaanxi Province(2024GX-YBXM-479). （No.2024GX-YBXM-479）
