采矿与安全工程学报2017，Vol.34Issue(6)：1103-1109,1115,8.DOI:10.13545/j.cnki.jmse.2017.06.010
基于能量原理的深埋隧洞TBM施工岩爆机理分析
Study on rockburst mechanism of TBM excavation for deep tunnel based on energy principle
摘要
Abstract
In order to reveal rockburst mechanism of tunnel boring machine (TBM) excavation for deep tunnel, on the basis of unloading characteristic of TBM excavation and energy accumulation form and by using the energy principle of rockburst, the energy criterion of rockburst for TBM excavation is established. The concept of elastic strain energy density (ESED) radial gradient of surrounding rock is put forward. Theoretical analysis show that the most likely location of rockburst is the position of the maximum value of ESED radial gradient in the surrounding rocks with following the energy criterion. Based on a water pipeline engineering project in Shanxi province, numerical calculation model of FLAC3Dis established to simulate the energy distribution and evolution of the surrounding rock during the TBM excavation unloading and reveal the rockburst mechanism of excavation. The simulation results show that the ESED of surrounding rock decreases firstly and then increases during the TBM excavation; there are two risky periods of TBM excavation rockburst which are corresponding two rockburst types. One is the immediate rockburst which occurs soon after excavation, the other is time delayed rockburst which occurs when the elastic strain energy re-accumulated after excavation. The ac-cumulative energy of surrounding rock is mainly input from deep surrounding rock doing work. Based on that, key suggestions on rockburst control of TBM excavation for deep tunnel are put forward which are to stop the energy transfer in surrounding rocks. Such suggestions play important reference for en-gineering cases.关键词
能量原理/深埋隧洞/TBM/岩爆机理/弹性应变能Key words
energy theory/deep tunnel/TBM/rockburst mechanism/elastic strain energy分类
矿业与冶金引用本文复制引用
蒋邦友,王连国,顾士坦,张晓东,李文帅..基于能量原理的深埋隧洞TBM施工岩爆机理分析[J].采矿与安全工程学报,2017,34(6):1103-1109,1115,8.基金项目
国家重点基础研究发展(973)计划项目(2014CB046905) （973）
国家重点研发计划项目(2016YFC0801403) （2016YFC0801403）
国家自然科学基金项目(51374140,51374199) （51374140,51374199）
江苏省研究生科研创新计划项目(KYLX15_1405) （KYLX15_1405）
