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Method for judging stability of tunnel face under different water storage capacities and different saturation time

A face-filled, water-saturated technology, used in special data processing applications, instruments, electrical digital data processing, etc.

Active Publication Date: 2018-11-06
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This situation cannot meet the actual needs of many water-rich strata and underwater tunnel construction in our country.

Method used

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  • Method for judging stability of tunnel face under different water storage capacities and different saturation time
  • Method for judging stability of tunnel face under different water storage capacities and different saturation time
  • Method for judging stability of tunnel face under different water storage capacities and different saturation time

Examples

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Effect test

Embodiment 1

[0124] The siltstone surrounding rock of a certain tunnel has been tested for its uniaxial dry compressive strength and uniaxial saturated compressive strength. According to step (1) b in the above method, the surrounding rocks with different saturation degrees (or different water-rich degrees) can be determined. The internal friction angle and cohesion of the rock are shown in Table 1. Using steps (2) to (5) in the above method, the face stability safety factor at different saturations can be obtained, as figure 2 shown. From figure 2 It can be seen from the figure that with the increase of saturation, the virtual support force increases and the safety factor of the tunnel face decreases. When the saturation reaches 0.3, the stability safety factor of the tunnel face is less than 1, indicating that the tunnel face will be unstable; from From the slope of the curve, when the water content is low, the gradient of the safety factor of face stability decreases with the increa...

Embodiment 2

[0129] The cohesion and internal friction angle of the surrounding rock under different water saturation times are as follows: image 3 shown. And according to formula (3) and formula (4) in step (1) a in the above-mentioned method, can be by image 3 According to the experimental results in , the functional relationship between the cohesion of the surrounding rock and the internal friction angle is obtained by fitting:

[0130] c=c(t)=110.875+435.690e -t / 19.838

[0131]

[0132] Assuming that the surrounding rock of a certain tunnel is of this lithology, the excavation height of the tunnel is 7m, the buried depth of the surrounding rock is 200m, and the weight of the surrounding rock is 22kN / m 3 , further through steps (2) to (5) in the above method, the stability safety factor of the face under different water saturation times can be calculated as follows: Figure 4 shown. From Figure 4 It can be seen from the figure that with the increase of the water saturation t...

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Abstract

The invention discloses a method for judging the stability of a tunnel face under different water storage capacities and different saturation time. The method provided by the invention mainly comprises the following the steps of performing an indoor experiment on surrounding rock of the tunnel face, acquiring a strength parameter under each water storage capacity and saturation time, and fitting the rock strength and the water storage capacity with the saturation time; according to parameters such as the buried depth of the tunnel and the excavation size, determining a geometrical relationshipamong the buried depth of the tunnel, the excavation size and a damage range; according to an principle of conservation of energy, solving a support force expression; then discounting the parametersof the surrounding rock through combining with a strength reduction method, to enable the supporting force to be zero, and determining a current reduction factor as a tunnel face stability coefficient; and changing the water storage capacity and saturation time, thus being capable of acquiring the stability of the tunnel face under different water storage capacities and different saturation time.According to the method provided by the invention, the computing method is provided for judging the stability of the tunnel face of the water-rich tunnel, and the security of the tunnel face under different water storage capacities and different saturation time can be estimated accordingly.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a method for judging the stability of tunnel faces under different water-rich degrees and water-saturated times. Background technique [0002] The stability of the surrounding rock near the face of the tunnel is the key problem and the core controlling factor in tunnel engineering, especially in the construction of water-rich tunnels and underwater tunnels in weak and broken sections. There are common reports of landslide accidents caused by unstable face, such as Changsha Yingpan Road Tunnel Face Collapse, Shahukou Tunnel Collapse, Nanshan Tunnel Collapse and other accidents; Highly concerned, many basic and application problems need to be solved urgently. At present, there are many studies on the stability of the excavation face of shield tunneling tunnels, mainly by reducing the support pressure ratio, the limit analysis upper limit method and the limi...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20
Inventor 安永林欧阳鹏博岳健胡文轩
Owner HUNAN UNIV OF SCI & TECH
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