Method for identifying water-bursting risks in karst tunnels

An identification method and risk technology, which is applied in the field of identification of a brand-new risk——karst flood water, can solve the problems of high water pressure, imperfection, high sediment content, etc., to save detection cost, improve reliability, Guaranteed safety effect

Active Publication Date: 2011-06-15
CHINA RAILWAY 11TH BUREAU GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (1) Large water volume, high water pressure, high sediment content, and irresistible destructive power;
[0005] (2) No warning, sudden and intermittent
However, the advanced horizontal drilling of the tunnel face is not perfect at present. Generally, the geological conditions are recorded during the drilling process, and the water volume and water pressure of the drilled hole are measured after the water is discharged from the drilled hole.

Method used

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  • Method for identifying water-bursting risks in karst tunnels
  • Method for identifying water-bursting risks in karst tunnels
  • Method for identifying water-bursting risks in karst tunnels

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing, the present invention is further described: its main operation process is:

[0045]During the construction of karst tunnels, advance geological prediction of the whole tunnel is carried out. The main contents of advanced geological forecast include: regional geological survey, TSP203, geological radar, geological sketch of tunnel excavation surface, infrared water detection of tunnel excavation surface. These are all conventional advanced geological forecasting work, through advanced geological discovery of karst water-rich areas.

[0046] After entering the karst water-rich section (area), identify the risk of karst water collapse.

[0047] The identification method is as follows: step 1, arrange and implement horizontal drilling on the face of the tunnel.

[0048] First, arrange the advanced horizontal drilling. Such as figure 1 As shown in the schematic diagram of the horizontal drilling layout, the drilling path 3 ...

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Abstract

The invention discloses a method for identifying water-bursting risks in karst tunnels, characterized by comprising the following steps: carrying out horizontal drilling on a tunnel working face; installing a pressure gage on a central test hole; implementing related water draining and shutting test methods and procedures; and according to the obtained test results, carrying out discrimination onhigh water-bursting risk identification. By using the detection and test methods, whether a rock salt cavity in front of a constructed tunnel has higher karst water-bursting risks can be judged quickly, so that corresponding engineering measures are taken for handling or avoiding the risks.

Description

technical field [0001] The invention relates to tunnel engineering risk management, in particular to a method for identifying a brand-new risk—karst water collapse during tunnel engineering construction. Background technique [0002] The Maluqing Tunnel of Yiwan Railway is the tunnel with the largest instantaneous water inflow in the history of tunnel construction in my country and even in the world. In the "1.21" water inrush accident in 2006, the instantaneous water inrush was as high as 200m 3 / s, the total amount of water gushing in 140 minutes is 110×10 4 m 3 . The water inrush destroyed all engineering facilities in the tunnel and caused casualties. During the next two years of construction, another 10×10 tunnel occurred in the Maluqing Tunnel. 4 m 3 The above water inrush 5 times. [0003] Water inrush and gushing in tunnel engineering are one of the common safety risks. However, water inrush in Maluqing Tunnel is quite different from ordinary karst water inrush...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/00E21B47/06G01V9/00
Inventor 张旭东
Owner CHINA RAILWAY 11TH BUREAU GRP
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