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Rapid construction method for short step excavation in weak surrounding rock tunnel

A technology for weak surrounding rock and tunnel excavation, applied in tunnels, tunnel linings, shaft linings, etc., can solve the problems of high construction safety risks, aggravate the weathering and disintegration of surrounding rocks, and low efficiency, so as to reduce construction safety risks and shorten the The effect of cycle time and cost reduction

Inactive Publication Date: 2019-01-11
NO 3 ENG COMPANY LTD OF CCCC FIRST HARBOR ENG COMPANY +1
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Problems solved by technology

This kind of process has low efficiency, and the surrounding rock is closed for a long time, which intensifies the weathering and disintegration of the surrounding rock, which is not conducive to the stability of the face, and the construction safety risk is great
Moreover, due to the short cycle footage and long cycle time, the construction period is long and the construction cost is high.

Method used

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  • Rapid construction method for short step excavation in weak surrounding rock tunnel
  • Rapid construction method for short step excavation in weak surrounding rock tunnel
  • Rapid construction method for short step excavation in weak surrounding rock tunnel

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Embodiment example

[0023] The Yu-Mo Railway (Yuxi-Mohan) starts from Yuxi, Yunnan Province, passes through Pu'er and Jinghong, and ends at Mohan Port. As an important part of the middle line of the Trans-Asian Railway, it is an important international channel linking Yunnan Province and even China to Laos, Myanmar, Thailand, Malaysia and Singapore, with a length of 507.4 kilometers. The inclined shaft of Manme No. 2 Tunnel (hereinafter referred to as "inclined shaft") is located on the right side of the main tunnel line, with a length of 1200m and a slope of 9.5‰. ). The surrounding rocks of the inclined shaft are mainly gray, gray black shale, mudstone interbedded with sandstone. The rock is soft, and the surrounding rocks are weathered differently, mainly in the weakly weathered zone and partially in the strong weathered zone. It is mainly thin-bedded, the bedding is not obvious, the rock mass is broken, and the joints and fissures are developed. The surrounding rock is cut into blocks by j...

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Abstract

The invention relates to the field of tunnel construction, in particular to a safe and fast short step construction method for a weak surrounding rock tunnel in Yunnan. The rapid construction processfor short step excavation changes the sequential construction organization mode in the traditional construction process to a parallel construction organization mode, that is, several construction procedures are constructed at the same time in different space, and thus, the procedure cycle operation time is shortened. The method can improve the stability of a tunnel face, the procedure cycle operation time is shortened at the same time, surrounding rock weathering and disintegration caused by exposure of the surrounding rock and disturbance to surrounding rock in the construction process are weakened, the construction safety risks are reduced, and the cost of the construction period is saved.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a safe and fast short-step construction method for tunnels with weak surrounding rocks in Yunnan. Background technique [0002] In the Xishuangbanna area of ​​Yunnan Province, due to the relatively active plate movement, the structural systems such as folds and faults are large in scale, far-reaching, and widely distributed. Affected by the geological structure, the geological lithology is mainly soft rocks of grades IV and V, and all of them have the characteristics of easy weathering and peeling, softening and disintegration when exposed to water, and shrinkage and cracking due to dehydration. This type of rock mass is prone to collapse under construction disturbance and long-term exposure, and the construction safety risk is great. The traditional tunnel construction technology adopts the sequential construction organization method, that is, the next process starts after th...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D9/04E21D9/12E21D11/10E21D11/18
CPCE21D9/00E21D9/001E21D9/006E21D9/04E21D9/126E21D11/10E21D11/18
Inventor 邱朋张晓华王淼邓宏朋匡凯
Owner NO 3 ENG COMPANY LTD OF CCCC FIRST HARBOR ENG COMPANY
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