|
|
|
| THERMO-MECHANICAL COUPLING AND ROCKBURST TENDENCY ANALYSIS OF DEEP HARD ROCK TUNNEL |
| CHEN Guoqing1，LI Tianbin1，HE Yonghua1，JIANG Liangwen2，FU Kailong2，MENG Lubo1 |
| (1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. China Railway Second Engineering Group Co.，Ltd.，Chengdu，Sichuan 610031，China) |
|
|
|
|
Abstract The failure mechanism of tunnel is more complex under the high geostress and high ground temperature action for deep hard rock tunnel. Loading-unloading triaxial tests on granite under different temperatures were carried out. The complete stress-strain curves of rock，mechanical parameters of rock，and macro failure types under different temperature conditions were analyzed in detail. The results show that there is a temperature threshold value of 60 ℃–100 ℃. The failure is from ductile to brittle with the temperature increase if the temperature does not exceed the threshold value. Temperature enhanced the brittle damage of hard rock. Shear is the dominant failure mode with the temperature increase. Then based on the test，thermo-mechanical coupling calculation was carried out. The thermal effect of excavation unloading for hard rock tunnel was calculated by using a brittle constitutive model and energy release rate index. The mechanical response to tunnel excavation was analyzed under different ground temperatures. The plastic zone，stress index and energy release value were compared quantitatively under different ground temperatures. The calculation showed that temperature increase would make rockburst intensity increase，and shear zone increase. The result of calculation and test data is consistent，and the analysis could benefit the understanding of brittle failure under high ground temperature.
|
|
Received: 03 December 2012
|
|
|
|
| [1] 许锡昌，刘泉声. 高温下花岗岩基本力学性质初步研究[J]. 岩土工程学报，2000，22(3)：332–335.(XU Xichang，LIU Quansheng. A preliminary study of basic mechanical properties for granite at high temperature[J]. Chinese Journal of Geotechnical Engineering，2000，22(3)：332–335.(in Chinese))
[2] ZHANG L Y，MAO X B，LU A H. Experimental study on the mechanical properties of rocks at high temperature[J]. Science in China(Series E)：Technological Sciences，2009，52(3)：641–646.
[3] LAU J S O，JACKSON R. The effects of temperature and water-saturation on mechanical properties of Lac duBonnet pink granite[C]// The 8th International Congress on Rock Mechanics. Tokyo，Japan：A. A. Balkema，1995：1 167–1 172.
[4] 吴 刚，王德咏，翟松韬，等. 高温下大理岩力学性质的试验研究[J]. 岩石力学与工程学报，2012，31(6)：1 237–1 244.(WU Gang，WANG Deyong，ZHAI Songtao，et al. Test research on mechanical properties of marble under high temperature[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(6)：1 237–1 244.(in Chinese))
[5] LIN Q X，LIU Y M，THAM L G. Time-dependent strength degradation of granite[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(7)：1 103–1 114.
[6] 李建林，陈 星，党 莉，等. 高温后砂岩三轴卸荷试验研究[J]. 岩石力学与工程学报，2011，30(8)：1 587–1 595.(LI Jianlin，CHEN Xing，DANG Li，et al. Triaxial unloading test of sandstone after high temperature[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(8)：1 587–1 595.(in Chinese))
[7] 张志镇，高 峰，徐小丽. 花岗岩力学特性的温度效应试验研究[J]. 岩土力学，2011，32(8)：2 346–2 352.(ZHANG Zhizhen，GAO Feng，XU Xiaoli. Experimental study of temperature effect of mechanical properties of granite[J]. Rock and Soil Mechanics，2011，32(8)： 2 346–2 352.(in Chinese))
[8] 李鹏举，冯光明，李守彦，等. 温度影响下大理岩脆塑性转换的机制分析[J]. 煤炭科学技术，2010，38(9)：23–25.(LI Pengju，FENG Guangming，LI Shouyan，et al. Analysis of fragility plasticity conversion mechanism of marble under temperature influences[J]. Coal Science and Technology，2010，38(9)：23–25.(in Chinese))
[9] 万志军，赵阳升，董付科，等. 高温及三轴应力下花岗岩体力学特性的实验研究[J]. 岩石力学与工程学报，2008，27(1)：72–77. (WAN Zhijun，ZHAO Yangsheng，DONG Fuke，et al. Experimental study on mechanical characteristics of granite under high temperatures and triaxial stresses[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(1)：72–77.(in Chinese))
[10] LI S Y，LAI Y M，ZHANG S J. An improved statistical damage constitutive model for warm frozen clay based on Mohr-Coulomb criterion[J]. Cold Regions Science and Technology，2009，57(2)： 154–159.
[11] 陈益峰，李典庆，荣 冠，等. 脆性岩石损伤与热传导特性的细观力学模型[J]. 岩石力学与工程学报，2011，30(10)：1 959–1 969. (CHEN Yifeng，LI Dianqing，RONG Guan，et al. A micromechanical model for damage and thermal conductivity of brittle rocks[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(10)：1 959– 1 969.(in Chinese))
[12] ANDERSSON J C，MARTIN C D. The ASPO pillar stability experiment：part II—rock mass response to coupled excavation-induced and thermal-induced stresses[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(5)：879–895.
[13] LAN H X，MARTIN C D，ANDERSSON J C. Evolution of in situ rock mass damage induced by mechanical-thermal loading[J]. Rock Mechanics and Rock Engineering，2013，46(1)：153–168.
[14] 江 权，冯夏庭，陈国庆. 考虑高地应力下围岩劣化的硬岩本构模型研究[J]. 岩石力学与工程学报，2008，27(1)：144–152.(JIANG Quan，FENG Xiating，CHEN Guoqing. Study of constitutive model of hard rock considering surrounding rock deterioration under high geostresses[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(1)：144–152.(in Chinese))
[15] 苏国韶，冯夏庭，江 权，等. 高地应力下地下工程稳定性分析与优化的局部能量释放率新指标研究[J]. 岩石力学与工程学报，2006，25(12)：2 453–2 460.(SU Guoshao，FENG Xiating，JIANG Quan，et al. Study on new index of local energy release rate for stability analysis and optimal design of underground rock mass engineering with high geostress[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 453–2 460.(in Chinese)) |
|
|
|
2013, Vol. 32 
