Optimization of Roadway Support Parameters in Soft Broken Sections Based on Orthogonal Test

Jianhua HU; Le PANG; Xueliang WANG; Minghua ZHENG

doi:10.11872/j.issn.1005-2518.2020.06.047

Highlights

Mineral resources are the foundation of social development.Projects such as efficient and safe tunneling and opening roadways are one of the main tasks of underground mines.Due to the differences in the geological conditions of the underground rock layers and the non-selective engineering environment，the roadway support in the soft broken section of the fault has an important impact on the construction and operation safety of the mine roadway.Taking the tunnel development project of the soft-segmented section of F₄ fault in Tiaoshuihe Phosphate Mine as an object，we studies how to improve the engineering stability of the roadway by reasonable support design under the influence of F₄ fault，the roof structure is poor，and the floor and surrounding rock are relatively soft.Finite difference software FLAC^3D was used to construct a three-dimensional numerical simulation model of the mine roadway.A Mohr-Coulomb model was used in this study.The model size is 40 m × 40 m × 40 m，the fault thickness is 8 m，the inclination angle is 75°，and the burial depth is 250 m.The side and bottom of the model are fixed boundaries，and the upper surface is not constrained.The side pressure coefficient is λ=1.2 with reference to Yichang area.The optimization of the support parameters involves three factors：The length of the anchor rod，the thickness of the shotcrete and the thickness of the masonry.Based on the investigation of its engineering geological conditions，an orthogonal experiment scheme of 3 factors （including 1 factor of 4 levels and 2 factors of 2 levels） of support parameters was designed.Based on the analysis of the support effect and deformation law of different parameter combinations，the length of the anchor rod，the thickness of the shotcrete and the thickness of the masonry were reasonably selected under the economic conditions，which provides theoretical basis for the final support mode and parameter optimization.The supporting method and parameters of the roadway were determined by range analysis.The research results show that：（1）The orthogonal experiment design can effectively reduce the number of experiments and improve the calculation effect.The analysis of variance of the calculation results identified the influencing factors of different results.The main factors affecting the displacement of the top and bottom plates，vertical stress，and sideways displacement of the roadway are the length of the anchor rod，the thickness of the concrete，and the thickness of the masonry.Reasonably selecting the size of support parameters is conducive to improving the effect of support.（2）Taking the displacement and stress of the roadway in the soft fault section as the research object，the optimal supporting scheme is determined as bolt length of 2.8 m，shotcrete thickness of 100 mm and arch thickness of 250 mm.The numerical simulation further verifies that the supporting effect under this parameter is conducive to improving the engineering stability of the soft fault section.（3）This study provides technical reference for the excavation and support of roadway of phosphorite and metal deposits with similar geological conditions，and has good demonstration and guidance significance.

Cite this article

Jianhua HU , Le PANG , Xueliang WANG , Minghua ZHENG . Optimization of Roadway Support Parameters in Soft Broken Sections Based on Orthogonal Test[J]. Gold Science and Technology, 2020 , 28(6) : 859 -867 . DOI: 10.11872/j.issn.1005-2518.2020.06.047

我国首个全国性矿产资源储量服务行业自律组织成立

2020年12月11日，中国矿业权评估师协会矿产资源储量专业委员会成立大会在广州举行。这标志着酝酿已久的国内第一个全国性矿产资源储量服务的行业性自律组织正式成立。

据悉，中国矿业权评估师协会矿产资源储量专业委员会成立后，将在政府部门的指导监督下，发挥自律管理作用，为会员开展矿产资源储量市场服务提供良好的执业环境，立足行业，面向全国，联通世界，构建高标准、高质量的矿产资源储量市场服务体系。经过三到五年改革探索，力争形成制度环境规范、机构队伍齐备、执业公开透明、诚信体系健全、国际互联互通、适应市场需要的具有中国特色的矿产资源储量市场服务体系。在深化矿产资源管理改革，促进矿产资源勘探开发和矿业行业高质量发展方面发挥桥梁纽带作用。

中国矿业权评估师协会会长王寿祥表示，培育矿产资源储量评审市场服务体系具有开创性、探索性，缩减政府直接备案事项，将释放矿产资源储量服务市场活力。在自然资源部矿产资源保护监督司等有关部门支持下，成立全国性矿产资源储量服务行业性组织，为建设储量市场服务体系提供组织保障，正是应时之需，恰逢其时，是我国矿产资源储量领域的一件大事，标志着我国矿产资源储量服务向市场化迈出了重要一步。

会上，中国矿业权评估师协会矿产资源储量专业委员会发布了《固体矿产资源储量报告规则》《固体矿产资源储量估算工作指南》《固体矿产资源储量评估工作指南》《矿产资源储量市场服务自律监督管理办法》等4项行业总则。明确矿产资源储量市场服务主要包括上市融资、并购重组及矿业权转让，以矿业权作价出资或合作、矿业权抵押贷款和国有资产等公共利益事项及海外勘查开采行为涉及的矿产资源储量估算、评估、咨询、鉴定，以及政府部门不再直接评审等业务。明确矿产资源储量专业委员会主要职责为：以市场为导向，借鉴国际通行做法，健全完善矿产资源储量市场服务相关制度，培育专业队伍, 建立职业道德规范和信用体系，为会员执业提供良好环境，发挥服务政府、行业、市场、会员的作用。

据悉，目前已有95家单位成为矿产资源储量专业委员会首批单位会员，108名个人成为首批个人会员。

中国工程院院士毛景文出席会议并致辞。自然资源部矿产资源保护监督司、矿产资源储量评审中心有关负责人参加会议。有关地勘、设计、矿山企业代表以及评估咨询、勘查服务等机构代表170余人参加了会议。

（来源：中国矿业报）

http://www.goldsci.ac.cn/article/2020/1005-2518/1005-2518-2020-28-6-859.shtml

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