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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Analysis of optimal supporting time of roadway in underlying goaf based on zone insecurity

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基于单元不安全度的下伏采空区巷道最优支护时机分析

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jul.2025, Vol.48 No.7: 1001-1008

DOI: 10.3969/j.issn.1003-5060.2025.07.022

Authors

YUAN Haiping, FANG Xingye, LI Yanlong, XIA Zijin, HUANG Songtao, YU Xuyang

(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: To reduce the negative impact of the underlying goaf on the stability of the roadway surrounding rock, this paper adopts the method of adjusting the supporting time to realize the purpose of actively regulating the surrounding rock deformation. Based on the theory of virtual supporting force method, three influencing variables, namely zone insecurity, stress release coefficient and displacement completion coefficient, are introduced, the relationship curves of the three variables are constructed to solve the optimal supporting time, and the comprehensive evaluation is carried out from the two aspects of displacement and supporting force. The results show that the distribution pattern of zone insecurity at the tunnel wall changes from circular to oval and finally to circular. The smaller the spacing between roadway and goaf, the shorter the optimal supporting distance. When the spacing is 0.5D (D is the tunnel diameter), the optimal supporting distance is advanced by 91.866%, and when the spacing is above 2.0D, the influence of goaf basically disappears. The research results can provide reference for related engineering.

Keywords: underlying goaf; supporting time; virtual supporting force method; zone insecurity

作者信息

袁海平，方兴业，李艳龙，夏子晋，黄松涛，于旭阳

（合肥工业大学土木与水利工程学院，安徽合肥230009）

摘要和关键词

摘要: 为降低下伏采空区对巷道围岩稳定性带来的负面影响,文章采用调整支护时机的方式来实现主动调控围岩变形的目的。在虚拟支撑力法的理论基础上,引入单元不安全度、应力释放系数和位移完成系数3个影响变量,构建出三者的关系曲线用以求解最佳支护时机,并从位移和支护力2个方面进行综合评价。研究结果表明:巷道洞壁处的单元不安全度分布形态由圆形变为椭圆形,最终再转变为圆形;巷道与采空区的间距越小,最优的支护距离越短,间距为0.5D(D为巷道洞径)时,最佳支护距离提前了91.866%,而当间距达到2.0D以上时,采空区的存在导致影响较小。该研究结果可为相关工程提供一定的借鉴作用。

关键词: 下伏采空区；支护时机；虚拟支撑力法；单元不安全度

Funding

国家自然科学基金资助项目（51874112）；安徽高校协同创新资助项目（GXXT-2020-055）

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