摘要
隧道内轮廓不仅影响隧道的空间利用率和经济性,同时也对隧道的稳定性和安全性有较大影响,合理的内轮廓扁平率可最大限度地满足结构安全性和隧道经济性的要求,所以找到合适的内轮廓形式至关重要。依托拟建龙门山高地应力隧道,设计六种两车道内轮廓形式和四种三车道内轮廓形式,进行位移和应力分析;对不同的内轮廓形式,分别采用强度应力比、应力强度比、弹性应变能及综合弹性应变能四种岩爆判据进行岩爆倾向性分析。结果显示:扁平率为0.85下的内轮廓形式为两车道的合理内轮廓形式,扁平率为0.65下的内轮廓形式为三车道的合理内轮廓形式。综合弹性应变能对比于其他三种岩爆判据,能够准确判断出一个隧道横断面下,各个位置发生岩爆程度的大小关系。
Inner tunnel contour not only affects the tunnel space utilization and economical efficiency,but also impacts the tunnel stability and security.Reasonable span ratio may meet the requirements of structural safety and tunnel economical efficiency to the maximum extent,thus it is important to find out the proper form of inner contour.Based on the high geostress tunnel to be built in Longmen Mountain,six kinds of two-lane inner contour form and four kinds of three-lane inner contour form were designed.In order to find out these two reasonable forms of inner contour,displacement and stress analysis were conducted on the designed forms and,for different form of inner contour,four criteria of rock burst,including strength-stress ratio,stress-strength ratio,elastic strain energy and integrated elastic strain energy,were used respectively to analyze the rockburst proneness.The result shows that,where the span ratio is 0.85,two-lane form of inner contour is reasonable;where the span ratio is 0.65,three-lane form is reasonable.The integrated elastic strain energy,compared to the other three criteria,may judge correctly under a cross section of tunnel the relationship of degree among the rock burst happened at each position.
作者
王希宝
袁松
蒋长伟
WANG Xibao;YUAN Song;JIANG Changwei(Sichuan Communication Surveying&Design Institute Co.,Ltd.,Chengdu 610017,China;Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)
出处
《路基工程》
2023年第5期142-148,共7页
Subgrade Engineering
基金
国家自然科学基金项目(52008351)
四川省交通运输科技项目(2021-B-01)
四川省科技计划资助项目(2021YJ0539)。
关键词
内轮廓
高地应力
岩爆判据
扁平率
综合弹性应变能
inner contour
high geostress
criterion of rock burst
span ratio
integrated elastic strain energy
作者简介
王希宝(1982−),男,四川梓潼人。高级工程师,主要从事隧道、岩土设计与研究工作。E-mail:55223426@qq.com。
