围岩力学响应特征在小净距隧道施工方法优选中的应用  

Application of Mechanical Response Characteristics of Surrounding Rock in the Optimization of Construction Methods for Small Spacing Tunnel

作　　者：罗贞焱[1] 罗周全[1] 郑淑芬 代转 丁春胜 LUO Zhenyan;LUO Zhouquan;ZHENG Shufen;DAI Zhuan;DING Chunsheng(School of Resources&Safety Engineering,Central South University,Changsha,Hunan 410083,China;Hunan Nonferrous Metals Vocational and Technical College,Zhuzhou,Hunan 412006,China)

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]湖南有色金属职业技术学院,湖南株洲市412006

出　　处：《矿业研究与开发》2020年第1期1-6,共6页Mining Research and Development

基　　金：国家自然科学基金资助项目（51274250）

摘　　要：为研究围岩力学响应特征在某Ⅴ级围岩小净距隧道施工方法优选中的应用,基于FLAC数值分析,建立了隧洞围岩应力释放分析模型,对比分析了隧道地表累积沉降、隧洞封闭位移、中夹岩柱位移、围岩应力分布和围岩塑性区分布5个力学响应特征。结果表明,两种施工方法在地表累积沉降、中夹岩柱位移、封闭位移、典型部位应力特征上各有优势,但两者在围岩塑性区分布特征上几乎无差别。结合两种施工工法的施工特性,确定右RC左CD为某Ⅴ级围岩小净距隧道优选的施工方法。In order to study the application of mechanical response characteristics of surrounding rock in the optimization of construction methods of a small spacing tunnel with V-grade surrounding rock,based on FLAC numerical analysis,a stress release analysis model of surrounding rock in the tunnel was established.And five mechanical response characteristics of the cumulative settlement of the tunnel surface,the closed displacement of the tunnel,the displacement of the middle rock column,the stress distribution of surrounding rock and the plastic zone distribution of surrounding rock were compared and analyzed.The results showed that the two construction methods had their own advantages in the cumulative settlement of the surface,the displacement of the middle rock column,the closed displacement and the stress characteristics of the typical parts,but had no difference in the plastic zone distribution of the surrounding rock.Combined with the construction characteristics of the two construction methods,it was determined that the combination method of Center Diaphragm method(CD)in right tunnel and Ring Cut method(RC)in left tunnel was the optimal method for this small spacing tunnel with V-grade surrounding rock.

关 键 词：小净距隧道 力学响应 方法优选 Ⅴ级围岩 

分 类 号：TD313[矿业工程—矿井建设]