| 瞬时强降雨下铁路岩溶隧道衬砌强度探讨——以贵州织毕铁路元宝山隧道为例 |
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| 引用本文： | 余洪璋.瞬时强降雨下铁路岩溶隧道衬砌强度探讨——以贵州织毕铁路元宝山隧道为例[J].中国岩溶,2019,38(6):916-923. |
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| 作者姓名： | 余洪璋 |
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| 作者单位： | 中铁二院工程集团有限责任公司贵阳公司，贵阳 550002 |
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| 摘 要： | 贵州是岩溶发育地区，强降雨对岩溶隧道衬砌破坏时有发生。贵州织毕铁路元宝山隧道通车前夕，瞬时强降雨致二衬多处发生挤出、跨塌、剥落、开裂、涌水、滴水等灾害，使织毕铁路开通计划被迫取消。本文借助MIDAS GTS数值模拟软件，计算并对比分析衬砌正常及施加50 m水压两种工况下，二衬位移量、轴力、弯矩及剪力情况，分析瞬时强降雨对铁路岩溶隧道衬砌强度的影响，主要结论如下:（1）在不考虑水压的情况下，二衬结构较为安全。当瞬时增加50 m水压时，因衬砌结构内力值过大，计算得出衬砌结构安全性已被破坏的结论；（2）对于地下水发育岩溶地段，若无水压的具体资料，建议III级围岩段采用钢筋混凝土衬砌，以增加衬砌对局部瞬时水压升高的抵抗能力；（3）泄水减压是解决水头上升水压过大致使衬砌破坏的关键。
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| 关 键 词： | 瞬时强降雨 岩溶隧道 衬砌强度 MIDAS GTS软件 |
Discussion on lining strength of railway tunnels in karst areas under instantaneous heavy rainfall: An example of the Yuanbaoshan tunnel of Zhijin-Bijie railway in Guizhou Province |
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| YU Hongzhang.Discussion on lining strength of railway tunnels in karst areas under instantaneous heavy rainfall: An example of the Yuanbaoshan tunnel of Zhijin-Bijie railway in Guizhou Province[J].Carsologica Sinica,2019,38(6):916-923. |
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| Authors: | YU Hongzhang |
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| Institution: | China Railway Eryuan Engineering Group Co.Ltd.，Guiyang，Guizhou 550002, China |
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| Abstract: | Guizhou is a karst highly developed province, where heavy rainfall often destroys tunnel lining. A typical case is that on the eve of opening of the Yuanbaoshan tunnel of the Zhijin-Bijie railway in Guizhou, an instantaneous heavy rain caused many damages of second-time linings at many places in the tunnel, such as extrusion, collapse, spalling, cracking, water inrush, and dripping, resulting in the cancellation of the railway opening planned. This work attempts to analyze the mechanism of this hazard. In terms of MIDAG GTS numerical simulation software, we calculate the displacement, axial force, bending moment and shear stress of the second-time linings under normal conditions and 50 m water pressure on linings, respectively, and examine the effect of instantaneous heavy rainfall on the strength of lining. Results show that， (1) without considering the water pressure, the second lining structure is relatively safe. When the instantaneous increase of 50m water pressure is posed, the lining structure is not safe because of the excessive internal force. (2) For the karst sections with groundwater development, if there is no specific data of water pressure, it is recommended that in the third-grade surrounding rock section, reinforced concrete lining is used to increase the lining’s resistance to local instantaneous water pressure rising. (3) Discharge and decompression are the key measures to solve the problem that the lining is destroyed because of the excessive water pressure. |
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