煤巷围岩稳定性定量化评价及分类支护技术OA北大核心CSTPCD
Quantitative evaluation method and classification support technology for surrounding rock of coal seam tunnels
目的 为了建立晋城矿区煤巷围岩稳定性评价指标和定量化分类方法,方法 在统计分析晋城矿区68组煤巷围岩强度、岩层结构发育程度、地应力数值的基础上,综合分析煤巷围岩稳定性影响因素,选取最大水平主应力、垂直主应力、顶板综合强度、巷帮煤体平均强度、顶板10 m范围内裂隙岩层厚度5个关键影响指标,提出顶板应力强度系数、巷帮应力强度系数、顶板松散性系数3个综合指标,通过K-means聚类算法,对煤巷顶板和巷帮进行定量化分类,结合成巷方式和煤柱尺寸,将晋城矿区煤巷围岩划分为5种稳定性类别和30种围岩类型.针对不同煤巷围岩稳定性类别,提出具体的支护形式和支护参数,并对不同类型围岩锚固方式、组合构件和护表构件进行精细化匹配.最后通过现场工业实践验证分类方法和支护方案的合理性.结果 矿压监测结果表明,巷道掘进期间顶底板最大移近量78 mm,两帮最大移近量58 mm,回采期间巷道顶底板最大移近量260 mm,两帮最大移近量119 mm.结论 晋城矿区煤巷围岩稳定性评价指标和定量化分类方法切实可行,分类支护方案合理.
Objectives In order to establish evaluation indicators and quantitative classification methods for the stability of coal roadway surrounding rocks in the Jincheng mining area,Methods on the basis of statis-tical analysis of 68 sets of coal roadway surrounding rock strength,rock structure development degree,and geostress data in Jincheng mining area,the influencing factors of coal roadway surrounding rock stability were comprehensively analyzed.Five key influencing indicators were selected,including maximum horizontal principal stress,vertical principal stress,comprehensive strength of the roof,average strength of the roadway coal body,and thickness of the fractured rock layer within a 10 m range of the roof.Three comprehensive in-dicators,namely roof stress intensity coefficient,roadway stress intensity coefficient,and roof looseness coef-ficient,were proposed.Through K-means clustering algorithm,the roof and roadway stability of the roadway were quantitatively classified.Combined with the roadway formation method and coal pillar size,the coal roadway surrounding rock in the Jincheng mining area was divided into 5 stability categories and 30 types of surrounding rock.Specific support forms and parameters were proposed for different types of tunnel sur-rounding rock stability categories,and precise matching was carried out for different types of surrounding rock anchoring methods,composite components,and protective surface components.Finally,the rationality of the classification method and support scheme was verified through on-site industrial practice.Results The monitoring results of mine pressure indicated that the maximum displacement of the roof and floor during tunnel excavation was 78 mm,and the maximum displacement of the two sides was 58 mm.During mining,the maximum displacement of the roof and floor during tunnel excavation was 260 mm,and the maximum dis-placement of the two sides was 119 mm.Conclusions The evaluation indicators and quantitative classifica-tion methods for the stability of surrounding rock in coal tunnels in the Jincheng mining area were practical and feasible,and the classification support scheme was reasonable.
焦建康;孙志勇;王涛;付玉凯
中煤科工 开采研究院有限公司,北京 100013||天地科技股份有限公司 开采设计事业部,北京 100013
矿山工程
煤层巷道地质力学测试定量化评价分类支护
coal seam roadwaygeomechanical testingquantitative evaluationclassification support
《河南理工大学学报（自然科学版）》 2024 (005)
19-27 / 9
国家自然科学基金资助项目(52004126,52174080);山西省科技重大专项项目(20191101017);中煤科工开采研究院科技创新基金资助项目(2020KCMS03)
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