西南交通大学学报2018，Vol.53Issue(3)：434-441,8.DOI:10.3969/j.issn.0258-2724.2018.03.002
热力耦合作用下拉林铁路桑珠岭隧道岩爆预测
Prediction of Rock Bursts for Sangzhuling Tunnel Located on Lhasa-Nyingchi Railway Under Coupled Thermo-Mechanical Effects
摘要
Abstract
Coupled thermo-mechanical effects on the prediction of rock bursts for tunnels with special geostress and high geotemperatures is a new problem that needs to be solved. During the excavation of the newly built Sangzhuling tunnel in the Lhasa-Nyingchi railway project,the geotemperature at different buried depths was obtained by field temperature test data inversion. The gradually changing hole stress during the excavation process was clarified by coupled thermo-mechanical numerical simulation. The range and intensity of rock bursts throughout the entire calculation scope of a typical section under various stress-relieving coefficients and geotemperature conditions,combined with different of rock burst criteria,such as Russense,TAO Zhenyu,WANG Yuanhan,and FAN Jianping criteria,were predicted. Finally,the prediction results were compared with the field measurements. The results show that the geothermal gradient of Sangzhuling tunnel is 5.5 ℃/100 m. As the buried depth of the tunnel increases,so does the geotemperature. The maximum compressive stress is concentrated in the vault and the arch springing in the deep-buried tunnel section with the gravity stress field. At 45-85 ℃,the maximum tangential and principal stresses increase linearly with an increase in the stress-relieving coefficient,and the maximum tangential and principal stresses increase by 84-96 MPa and 93-96 MPa,respectively,when the stress-relieving coefficient reaches 100 %;the intensity of rock bursts will increase under these conditions. The analysis using the four methods for predicting rock bursts compared with rock burst data from results in field tests shows that the occurrence of rock bursts will be accelerated during stress release by coupled thermo-mechanical effects. The prediction of middle level and greater intensity rock bursts using the TAO Zhenyu criterion shows great sensitivity for the earlier stages of stress release. In the mid-late periods of stress release, the rock bursts prediction results using the WANG Yuanhan criterion are in accordance with the measured results.关键词
隧道工程/热力耦合作用/高地应力/数值模拟/岩爆预测Key words
tunnel engineering/thermo-mechanical coupling effects/special geostress/numerical simulation/rock bursts prediction分类
矿业与冶金引用本文复制引用
严健,何川,汪波,蒙伟,杨俊峰..热力耦合作用下拉林铁路桑珠岭隧道岩爆预测[J].西南交通大学学报,2018,53(3):434-441,8.基金项目
国家自然科学基金资助项目(51578456,U1734205) （51578456,U1734205）
国家重点研发计划资助项目(2016YFC0802201,2016YFC0802210-1-1) （2016YFC0802201,2016YFC0802210-1-1）
中国铁路总公司科技研究开发计划资助项目(2017G006-B) （2017G006-B）
