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| EXPERIMENT RESEARCH ON SUPPORT PARAMETERS OF LARGE STRAIN PHYLLITE TUNNEL UNDER HIGH STRESS |
| ZHANG Ji-kui , FANG Jun-bo |
| Tunnel Engineering Group Co. Ltd of China Railway |
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Abstract The mountaintop section of Wushaoling tunnel lies in the F4~F7 compression faultage of Qilianshan tectonic area, in which has high original stress. The high stress will be decreased for the displacement of phyllite because the excavation and construction in the weak ground will lead to the larger strain from structure of tunnel. The differential support parameters from four experiment sections have been compared with and analyzed by the displacement tests, so we can drawn the followings conclusions by series of the studies in this paper: the preparatory support parameters on the experiment section of Wushaoling tunnel can be gained; and the H175 type steel with thick limb can offer enough support strength during early phase, especially can ensure the horizontal safety and stabilization of the steel arch; the small diameter rock anchor can offer the support structure larger force. And it shows the large deformation characters which control the support structure the strain from flexible to rigid as well as from free to restraining.
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Received: 25 February 2005
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[1]方俊波《乌鞘岭隧道岭脊段复杂应力变形控制技术研究》阶 段报告[R].洛阳:中铁隧道集团，2004,(10):64-68.
[2]吴克绍.高地应力大断层中用锚喷网钢支架复合支护[J].江 苏煤炭，1998,(10):15-16.
[3]陈仲先，汤雷.高地应力大型地下洞室的位移和锚杆应力 特性[J].岩土工程学报，2000,(5):294-298.
[4]李永林.二郎山隧道在高地应力条件下大变形破坏机理的 研究及治理原则[J].公路.成都::2000,(12):2-5.
[5]王明年，张建华.工程措施对控制隧道围岩变形的力学效果 研究[J].岩土工程学报，1998,(9):27-30.
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2005, Vol. 22 
