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A method for excavating tunnels in debris flow formations

A mud-rock flow and mud-rock fluid technology, applied in tunnels, earthwork drilling, tunnel lining, etc., to achieve the effect of preventing mud-rock sliding

Active Publication Date: 2019-12-03
CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the above-mentioned risks and problems existing in the excavation of existing debris flow tunnels, and to provide a method for excavating tunnels in debris flow formations. Under the condition of no disturbance or little dist

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  • A method for excavating tunnels in debris flow formations
  • A method for excavating tunnels in debris flow formations
  • A method for excavating tunnels in debris flow formations

Examples

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Embodiment 1

[0027] Example 1: Case Study of Diversion Tunnel of Ilam Power Station in Nepal

[0028] The diversion tunnel of the Ilam Diversion Power Station in Nepal is about 3,500m long, and the tunnel excavation section is 2.5m*2.5m. The tunnel is in the shape of a city gate. The exit section of the tunnel needs to traverse a landslide body of about 400m in length; branch A needs to traverse a landslide of nearly 200m body. The groundwater level in this area is high. During the tunnel excavation process, the landslide body was rich in water and the stratum was unstable. After the support was completed, the tunnel collapsed many times due to the activity of the slope deposits caused by the influx of water and mud (sand). After the excavation of the tunnel exit section and the completion of the steel support for about 100m, the linear flow hole on the support surface was not closed in time, which caused mud and rock flow to engulf the 100m tunnel and caused the roof to fall. The ground form...

Embodiment 2

[0042] Example 2: 8.2 Case of the first phase of the Yellow River crossing project in the middle route of the South-to-North Water Transfer Project

[0043] The exit building of the first phase of the Yellow Crossing Project of the Middle Route of the South-to-North Water Transfer Project is located at the downstream of the Yellow Crossing Tunnel. The main axis and the axis of the Yellow Crossing Tunnel intersect at an angle of 9.947°. It is composed of the inlet section, the exit tunnel, the outlet stilling pool, and the drainage channel. 1019.21m. The retreat structure passes through the Manshan Mountain through the retreat tunnel to connect the entrance of the Yellow River tunnel to the Yellow River. The main function is to discharge the excess water of the main canal to the Yellow River during the maintenance of the Yellow River tunnel. At the same time, it also has the role of successively supplying water to the Yellow River.

[0044] The total length of the exit tunnel is 790...

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Abstract

The invention relates to a mud-rock flow stratum tunnel excavating method. According to the method, relative stability of mud-rock flow is utilized, reinforcing rib scaffolding and an isolation layerare completed by adopting a primary underpinning technology to support the mud-rock flow beyond the excavating range, namely, the existing balance of the mud-rock flow is not broken, so that the perturbation of the mud-rock flow body beyond the excavating range does not exist or is slight to form a water permeable and sand (mud) proofing isolation layer, and the isolation layer has the advantagesthat one, the drainage of mud-rock flow body is convenient to prevent mud rock sliding caused by accumulated water, two, the loss of mud and sand in the mud-rock flow body resulting in the hollow support among rocks causing the sliding of boulder sliding which generates impacting force to damage a scaffolding structure and is prevented; a secondary underpinning technology mainly aims at steel support, and a temporary structure of back shore combining with overhanging is switched to a sealed ring overall force-bearing structure with better force bearing performance. The primary and second underpinning technologies are adopted to complete the reinforcing rib scaffolding and the isolation layer to support the mud-rock flow beyond the excavating range, and therefore steady progress is made inthe excavating of a mud-rock flow stratum tunnel.

Description

Technical field [0001] The invention relates to the field of tunnel engineering, in particular to a method for excavating a tunnel in a debris flow stratum. Background technique [0002] Debris flow is a temporary torrent containing a lot of mud, sand and rocks that occurs in mountainous areas. The main difference between debris flow and general torrent is that this fluid is composed of solid and liquid, and the solid matter content is large. In special circumstances, the solid content accounts for more than 80%, and the weight can reach 23kN / m3. Its characteristics are: sudden outbreak, huge energy, short duration, and frequent relapses. Therefore, the destructive power is huge. The topography of the slope is the main source of the solid matter of the debris flow, most of which are natural solid sources. The solid source composition is mainly the exposed clastic rock strata in the area, the scattered soil covered on the slope, and the thickness of the accumulation on the slope...

Claims

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Application Information

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IPC IPC(8): E21D9/04E21D11/15E21D11/18E21D11/00
CPCE21D9/04E21D11/003E21D11/152E21D11/18
Inventor 陈敦刚陈文娟
Owner CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD