Construction method of tunnel with uneven hard and soft rock under high ground stress condition
A technology with high ground stress and uneven hardness, which is applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of increasing construction safety and uneven hardness of rock, so as to increase construction safety, improve work efficiency, Controlling the effect of vault settlement
Inactive Publication Date: 2019-06-14
THE 2ND ENG CO LTD OF CHINA RAILWAY 16TH BUREAU GRP
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Problems solved by technology
[0004] Aiming at the above-mentioned technical problems in the related art, the purpose of the present invention is to provide a construction method for tunnels with uneven hardness and softness of rock under high ground stress conditions, which can overcome the above-mentioned deficiencies in the existing products and can effectively control the settlement of the vault , horizontal and lateral convergence and other deformations, improve work efficiency, reduce construction and management costs, solve the problem of uneven rock hardness and water-rich surrounding rock in the tunnel, and increase construction safety
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[0030] like Figure 1-3 As shown, in the construction method of a tunnel with uneven rock quality under high ground stress conditions described in the embodiment of the present invention, the upper steps are excavated step by step, and the weak and loose parts are manually excavated first, followed by weak blasting for a certain distance. The rock is relatively hard; after the excavation of the upper step is completed, the excavation and support of the left and right parts of the second step will start after a certain distance, forming a situation where the excavation and support on the left and right sides cross each other; excavation by the same method The third step; after the lower step is completed, the inverted arch will follow up in time to shorten the time for the initial support to form a ring.
[0031] In specific use, according to the construction method of a tunnel with uneven rock quality and hardness under high ground stress conditions according to the present in...
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The invention relates to a construction method of a tunnel with uneven hard and soft rock under the high ground stress condition. The construction method comprises the following steps that (1) advanced support of an advanced conduit is carried out before excavation, and the right side of an upper bench on a section is excavated; (2) the left side of the upper bench of the section is excavated; (3)the right side of a middle bench of the section is excavated; (4) the left side of the middle bench of the section is excavated; (5) the right side of a lower bench of the section is excavated; (6) the left side of the lower bench of the section is excavated; (7) the upper bench, the middle bench and the lower bench are excavated, and core soil is reserved; and (8) an inverted arch is excavated.The construction method has the beneficial effects that deformations such as vault settlement and horizontal lateral convergence can be effectively controlled, the work efficiency is improved, the construction and management costs are reduced, the uneven hard and soft rock and water-rich surrounding rocks in the tunnel are solved, and the construction safety is enhanced.
Description
technical field [0001] The invention relates to the technical field of tunnel engineering construction, in particular to a construction method for tunnels with uneven hardness and softness of rock under high ground stress conditions. Background technique [0002] Tunnel engineering under high ground stress conditions has complex forces, complex geological structures, poor stability of surrounding rocks, and high construction risks, especially in rocks with uneven hardness and water-rich surrounding rocks. According to the commonly used construction methods, step method and step method + Construction methods such as temporary inverted arch and CD method are difficult to overcome and have certain limitations. At present, there are more and more long tunnels and the geology is complex and changeable. Due to the complex geology and hydrology, crossing rich water and various fault zones occurs from time to time. Therefore, on the premise of ensuring safety and quality, it is the...
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IPC IPC(8): E21D9/00E21D11/10E21D11/14E21D11/15E21D20/00
Inventor 张传安马栋申翔马自远李鹏飞董海成张振华李瑛
Owner THE 2ND ENG CO LTD OF CHINA RAILWAY 16TH BUREAU GRP