岩土工程学报2016，Vol.38Issue(7)：1230-1237,8.DOI:10.11779/CJGE201607009
隧道周边不同位置径向裂纹对隧道围岩稳定性影响规律的研究
Influence of radial cracks on stability of surrounding rocksat different locations around tunnel
摘要
Abstract
In order toinvestigate the failure laws of straight wall tunnel with a single radial crackunder biaxial compression load, two casesare studied.Oneis the crack located in the arch shoulder to the vault with the vault semicircle center as the basis of radial crack.The otheris the crack located in the tunnel bottom or arch wall,and the angle betweenthe crack surface and the tunnel wallis fixed at 135 degrees. In the experiment,usingmodel tests and numerical simulations, the test samples of cement mortarare investigated. The stress intensity factor and the stress chart of the crack tipare numericallycalculated, and the simulated resultsare in good agreement with the experimentalones.The results show that: (1) The crack reduces the stability of the tunnel and the compressive strength. (2)Whenthe radial crack islocatedon the arch shoulderorthe vault with angleof 45 °, the stability of the tunnelis the worst, andit is most easily damaged.(3)When the crackislocated at the junction between the arch bottom and the arch wall, the tunnelis the most vulnerable, and the overall stabilityis the worst.关键词
隧道/应力强度因子/数值模拟/径向裂纹Key words
tunnel/stress intensity factor/numerical simulation/radialcrack分类
土木建筑引用本文复制引用
周磊,朱哲明,刘邦..隧道周边不同位置径向裂纹对隧道围岩稳定性影响规律的研究[J].岩土工程学报,2016,38(7):1230-1237,8.基金项目
国家自然科学基金项目（51074109）；四川省科技计划项目（2014JY0002）；油气藏地质及开发工程国家重点实验室资助项目 （）
