Construction method for composite stratum with hard top and soft bottom of large-section tunnel

A technology of composite stratum and construction method, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problem of no practical construction method for upper hard and lower soft strata, and achieve fast construction progress, high safety, and good construction economy. Effect

Inactive Publication Date: 2012-07-11
THE SECOND CONSTR OF CTCE GROUP
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Problems solved by technology

[0002] During tunnel construction, various abnormal geological conditions will be encountered. For example, the upper part of the excavation section of the tunnel is hard rock, and the surrounding rock grades are grades II and III; the lower part is soft rock, and the surrounding rock grades are grades IV and V. , how to comprehensively judge the level of surrounding rock for construction is very important, but in the prior art, there are many constructions in the upper soft and lower hard strata, but there is no practical construction method for the construction of upper hard and lower soft strata

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  • Construction method for composite stratum with hard top and soft bottom of large-section tunnel

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Embodiment Construction

[0017] According to the characteristics of different upper-hard and lower-soft composite formations, this construction method is mainly based on the thickness of the upper hard rock, the grade of surrounding rock, and the stability of the lower soft rock. Adopt different construction schemes for construction.

[0018] This embodiment is to build the second double-track Basumu tunnel (total length 8184m) on the Jining-Baotou section of the Beijing-Baotou Line. , the tunnel excavation section is greater than 130m 2 , with an excavation height of 11m and a maximum excavation width of 14m. During the construction of the tunnel exit, the excavation revealed that the excavation range of the tunnel is an upper-hard and lower-soft composite stratum. The upper part of the tunnel face is basalt with a thickness of 1-9 meters. Mudstone is cemented and has a certain degree of self-stability, but it is easy to disintegrate when exposed to water and has poor stability. The grade of surrou...

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Abstract

The invention discloses a construction method of a railway tunnel, and particularly relates to a construction method for a composite stratum with the hard top and the soft bottom of a large-section tunnel. The method includes excavation construction; initial-stage supporting; and inverted arch and lining construction. When the thickness of a hard surrounding rock on the upper portion of a working surface of the tunnel is smaller than 2m in an excavation construction process, the excavation construction method is a three-step seven-pace method; and when the thickness of the hard surrounding rock on the upper portion of the working surface of the tunnel is larger than 2m, the excavation construction method is a three-step method. The construction method has the advantages of fast construction progress, high safety and fine construction economical efficiency.

Description

technical field [0001] The invention discloses a tunnel construction method, in particular to a tunnel construction method aimed at upper hard and lower soft composite formations. Background technique [0002] During tunnel construction, various abnormal geological conditions will be encountered. For example, the upper part of the excavation section of the tunnel is hard rock, and the surrounding rock grades are grades II and III; the lower part is soft rock, and the surrounding rock grades are grades IV and V. , how to comprehensively judge the surrounding rock level for construction is very important, and in the prior art, there are many constructions in upper soft and lower hard strata, but there is no practical construction method for upper hard and lower soft stratum construction. [0003] According to the geological conditions of the Basumu Tunnel, we have carried out technical research, researched and formulated the construction method of the upper-hard and lower-soft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/10
Inventor 李波邵建龙赵飞
Owner THE SECOND CONSTR OF CTCE GROUP
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