Calculation method for karst safety thickness of karst tunnel

A technology of safety thickness and calculation method, applied in calculation, special data processing application, instrument, etc.

Inactive Publication Date: 2015-12-16
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve these potential problems, the purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide a relatively complete calculat

Method used

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  • Calculation method for karst safety thickness of karst tunnel
  • Calculation method for karst safety thickness of karst tunnel
  • Calculation method for karst safety thickness of karst tunnel

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Embodiment 1

[0181] Figure 11 Shown is a schematic diagram of the positional relationship between the Yiwan Line Zhuoguan Tunnel and the hidden karst cave at the top.

[0182] Specifically, the mileage DK48+87l~DK49+960 of the Wuzhaoguan Tunnel on the Yiwan Line is located at the core of a wide and gentle syncline, with developed karst depressions, funnels, and water-dispelling tunnels on the surface, and a concentrated karst cave underground, where the tunnel crosses the karst cavity The width is about 30m, the elevation of the tunnel bottom is 552.1m, and the elevation of the tunnel shoulder is 540.53m, a difference of 11.57m. The grade of the surrounding rock in this section is Grade II. According to the available data, the lateral pressure coefficient of the surrounding rock in the tunnel is 1.1-1.6. The average buried depth of the tunnel in this section is 120m. Dissolution cavity, no gravel, sediment and water filled inside [1] . Let the water pressure p=0, the tensile strength, ...

Embodiment 2

[0190] Dazhiping Tunnel of Yiwan Line is located in Dazhiping Town, Badong County, Enshi Prefecture. The total length of Line I is 8775m, and the total length of Line II is 8789m. The maximum buried depth is 495m. 3991m of drainage holes. Unfavorable geology is mainly karst, gas, fault fracture zone, etc. In the core of Tangping syncline, the bottom of Qixia Formation, the bottom of Changxing Formation, Daye Formation and near faults, there are areas where karst is concentrated and karst water is enriched, and outbursts may occur. Water and mud karst disasters. 990 large-scale water-rich caverns include: Line I DK132+947~+957, DK133+006~+027, Line II IIDK132+913~+921, DK132+973~+997 developed large-scale water-rich filled caves, combined for short "990 Dissolving Chamber". Basically, it develops along the direction of the bedding and rock strata, and the karst caves on the I and II lines are connected and pinched out at the left wall of the drainage cave. Among them, the DK...

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Abstract

The invention discloses a calculation method for karst safety thickness of a karst tunnel. The method comprises the steps: A, simplifying the karst tunnel and a dissolved chamber into a structural mechanics model, and respectively calculating maximum shear force and maximum bending moment borne by a complete bed rock and a non-complete bed rock; B, substituting the maximum shear force and the maximum bending moment into a bending strength formula to obtain a safety thickness calculation formula based on the bending strength; C, substituting the maximum shear force and the maximum bending moment into a shear strength formula to obtain a safety thickness calculation formula based on the shear strength; and D, introducing a correction factor n, and correcting the safety thickness calculation formula based on the bending strength and the safety thickness calculation formula based on the shear strength. According to the calculation method for the karst safety thickness of the karst tunnel, a set of relatively complete theoretical calculation method is provided for calculating the safety thickness of the bed rocks of the karst tunnel, so that the safety of the karst tunnel is ensured, and the occurrence of karst geological disasters such as inrush of clay and water and the like can be effectively prevented.

Description

technical field [0001] The invention relates to the field of tunnel safety, in particular to a method for calculating the karst safety thickness of a karst tunnel. Background technique [0002] It can be seen from domestic and foreign karst tunnel water inrush disasters that the karst tunnel water inrush disaster has become one of the most common, most likely and most destructive disasters in underground engineering construction in karst areas. However, due to the complexity and concealment of the development of karst and the occurrence of water-bearing and water-conducting structures, and the mechanism of tunnel water inrush and water gushing involves multi-disciplinary knowledge (including karstology, structural geology, water chemistry, groundwater dynamics, etc.) , Fracture Mechanics, Mineral Petrology, Sedimentology, Fluid Mechanics, Rock Mass Hydraulics, etc.), therefore, the research on the mechanism of water inrush disaster mechanics in karst tunnels is a huge projec...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张军伟陈瑶瑶曾艺马小杰梅志荣钱进
Owner SOUTHWEST PETROLEUM UNIV
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