Opencut tunnel structure of high abrupt slope tunnel portal and avalanche rock falling prevention method
A technology for tunnel entrance and steep slope, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the hidden dangers and hazards of safety, and achieve the effect of avoiding accumulation, ensuring construction safety, and uncomplicated design principles.
Active Publication Date: 2020-09-08
CHINA RAILWAY 18TH BUREAU GRP CO LTD
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Problems solved by technology
However, due to the high altitude of the tunnel, the snow does not melt for a long time in winter, and gradually accumulates on the surface of the slope protection measures. After accumulating to a certain amount and volume, an avalanche will occur without warning, thus burying the tunnel entrance and blocking railway traffic. It may even cause railway traffic accidents, with great harm and serious consequences, and there is a great potential safety hazard during the operation of the railway
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[0038] The specific situation of the implementation of this embodiment is that a tunnel with a total length of 8601m is a double-track railway tunnel. The entrance end is located at the lower part of a hillside with a height of about 140m. There are many kinds of miscellaneous trees, but the cracks in the weathered sandstone are very well developed, and large and small stones often roll down, and the rolling marks are fresh in all seasons. The entrance is located in the middle and lower part of the high and steep slope, about 130m away from the top of the slope and about 40m away from the ground at the foot of the slope.
[0039] The high and steep slope adopts multi-level protection measures to solve the safety risk of boulders rolling down from time to time or concentrated falling rock piles on the mountain. However, due to the high altitude of the tunnel, the snow does not melt for a long time in winter, and gradually accumulates on the surface of the slope protection measu...
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The invention provides an opencut tunnel structure of a high abrupt slope tunnel portal, and relates to the technical field of high abrupt slope tunnel portals. The opencut tunnel structure comprisesan arched opening, a stopping part and a protecting part; the protecting part is arranged on the outer side of the arched opening in a covering mode; the stopping part is fixedly arranged at the frontend of the protecting part; and the protecting part comprises a side protecting part, an arc roof protecting part and a separation tunnel roof, the outer side of the bottom of the side protecting part is provided with convex parts, and the top of the arc roof protecting part is provided with the separation tunnel roof. The invention further provides an avalanche rock falling prevention method forthe high abrupt slope tunnel portal. By arranging opencut tunnel integrated engineering and arranging fixing protective engineering on a mountain, the characteristics that the tunnel portal protecting effect is good, the design principle is not complex, the construction period is shortened, and the cost is not high are achieved.
Description
technical field [0001] The invention relates to the technical field of high-steep slope tunnel entrance protection, in particular to an open cavity structure at a high-steep slope tunnel entrance and a method for preventing avalanches and falling rocks. Background technique [0002] With the continuous advancement of the strategic plan for the development of the western region, the transportation industry in the western region is developing vigorously. The western part of my country is a mountainous and hilly area, with steep terrain and dense distribution of mountains. In recent years, rolling stone disasters have occurred frequently. While large-scale engineering projects such as the Yiwan Railway, Shanghai-Chengdu-West Expressway, and West-East Gas Pipeline are being carried out, human engineering activities Induced rockfall disasters have occurred frequently. During the "5.12" earthquake, rockfalls had countless impacts on traffic fortresses. During the disease control st...
Claims
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IPC IPC(8): E21D9/14E21D11/10E21D11/18E21F16/02E21F15/00
CPCE21D9/14E21D11/10E21D11/18E21F16/02E21F15/00
Inventor 张湘平李缓郭子冉
Owner CHINA RAILWAY 18TH BUREAU GRP CO LTD