万福矿深埋大断面T型交叉点高预应力NPR支护机制及应用  

Supporting mechanism and application of high pre-stress NPR in surrounding rock of deeply-buried large section T-type intersection in Wanfu coal mine

作　　者：孙晓明[1,2] 齐振敏 缪澄宇 臧金诚 高祥 赵成伟 张勇[1,2] SUN Xiao-ming;QI Zhen-min;MIAo Cheng-yu;ZANG Jin-cheng;GAO Xiang;ZHAO Cheng-wei;ZHANG Yong(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining&Technology Beijing,Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining&Technology Beijing,Beijing 100083,China;Yanmei Wanfu Energy Co.,Ltd.,Heze,Shandong 274922,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430060,China)

机构地区：[1]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083 [3]兖煤万福能源有限公司,山东菏泽274922 [4]中国科学院武汉岩土力学研究所,湖北武汉430060

出　　处：《岩土力学》2023年第4期1130-1141,共12页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51874311,No.51904306);中央高校基本科研业务费专项资金(No.2022YJSSB03)。

摘　　要：为解决深部大断面软岩巷道交叉点大变形问题,以万福煤矿千米深井巷道交叉点为工程实例,首次在巷道支护中运用微观负泊松比(negative Poisson’s ration,NPR)钢锚索。采用室内试验、理论分析、数值模拟及现场试验相结合的方法,分析了深埋巷道交叉点的围岩变形机制,提出了以微观NPR钢锚索为核心的控制对策。通过室内静力拉伸试验对微观NPR钢锚索的力学特性进行研究,结果表明,微观NPR钢锚索拉伸全过程表现为高恒阻,均匀拉伸,无屈服平台,破断时无明显颈缩现象。通过理论推导,基于T型巷道交叉点围岩最大影响范围,建立微观NPR钢锚索支护T型巷道交叉口最大影响范围计算模型。通过数值模拟,再现T型巷道交叉口的破坏演化过程,分析对比普通支护/微观NPR钢锚索支护效果。现场开展支护应用试验与监测,验证了长短微观NPR钢锚索联合支护对策具有良好的交叉口围岩大变形控制效果,为交叉口围岩安全稳定控制提供了新支护材料和支护手段。In order to tackle the problem of large deformation at the crossover point of deep large section soft rock tunnel, this paper takes the crossover point of kilometer deep tunnel in Wanfu coal mine as an engineering example and applies microscopic negative Poisson's ration(NPR) steel anchor cable in tunnel support for the first time. The deformation mechanism of the surrounding rock at the intersection of deeply buried roadways is analyzed, and a control countermeasure with microscopic NPR steel anchor cables as the core is put forward by using a combination of laboratory test, theoretical analysis, numerical simulation and field test. The mechanical properties of microscopic NPR steel anchor cables are studied by static tensile test in laboratory. The results show that the whole process of microscopic NPR steel anchor cables is characterized by high constant resistance, uniform tension, no yield platform, no obvious necking effect at break. Based on theoretical deduction and the maximum influence range of surrounding rock at T-type tunnel intersection, a calculation model of the maximum influence range of T-type tunnel intersection supported by microscopic NPR steel anchor cable is established. Through numerical simulation, the failure evolution process of T-shaped tunnel intersection is reproduced, and compared with the support effect of common microscopic NPR steel anchor cable. On-site support application test and monitoring are carried out. It verifies that the long-short microscopic NPR steel anchor cable combined support strategy has good control effect on large deformation of surrounding rocks at the intersection, which provides new support materials and means for safety and stability control of surrounding rocks at the intersection.

关 键 词：千米深井 大断面 T型巷道交叉点 微观NPR钢锚索 巷道支护 

分 类 号：TU457[建筑科学—岩土工程]