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Determining the timing and method of excavation from opposite direction to one direction before the breakthrough of deep hard rock tunnel

A determination method and technology for tunnels, which are applied in tunnels, earth-moving drilling, mining equipment, etc., can solve problems such as non-technical operation plans, and achieve the effect of reducing the risk of rock-pillar rockburst, making the operation feasible, and ensuring safety.

Active Publication Date: 2015-08-12
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At home and abroad, there are few studies on the timing and method of determining the timing and method of one-way excavation before the penetration of opposite-facing tunnels. The only relevant research focuses on experience and numerical simulation, and there is no technical operation plan

Method used

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  • Determining the timing and method of excavation from opposite direction to one direction before the breakthrough of deep hard rock tunnel
  • Determining the timing and method of excavation from opposite direction to one direction before the breakthrough of deep hard rock tunnel
  • Determining the timing and method of excavation from opposite direction to one direction before the breakthrough of deep hard rock tunnel

Examples

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Effect test

Embodiment 1

[0028] A method for determining the timing and method of changing from one direction to one direction before the breakthrough of a deep buried hard rock tunnel, the method is carried out according to the following steps:

[0029] 1) When the distance between two facing tunnel faces is 5 times the tunnel diameter, at least 4 microseismic sensors shall be arranged behind each tunnel face to monitor the microseismic occurrence of rock mass near the two tunnel faces during the opposite tunneling process. The micro-vibration signal produced at the time of rupture. The microseismic sensor is embedded and installed through drilling, and is fixedly coupled with the rock mass. The embedded depth must exceed the relaxation depth of the surrounding rock. The layout scheme of microseismic sensors should be conducive to the acquisition of microseismic signals by microseismic sensors and the positioning of microseismic sources. The distance between the microseismic sensor and the working f...

Embodiment 2

[0040] The through-hole section of a deep-buried facing tunnel is 2500m deep, the lithology is hard and compact marble, and the tunnel diameter is 12m. figure 1 . The relaxation depth of surrounding rock is within 3m.

[0041]1) When the distance between the two tunnel faces is 5 times the tunnel diameter, that is, 60m, 6 microseismic sensors are arranged near the section 60m behind each tunnel face to monitor the rupture of the two tunnel faces and the surrounding rock mass Generated micro-vibration signal. The microseismic sensor is embedded and installed through drilling, and the embedded depth is 5m, which exceeds the relaxation depth of the surrounding rock. Grouting is injected into the hole, so that the microseismic sensor is fixedly coupled with the rock mass. There should be a certain distance between the microseismic sensor and the working face to prevent damage to the microseismic sensor caused by excavation of the working face if the distance is too close, and i...

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Abstract

The invention discloses a method for determining timing and modes for changing opposite advancing into unidirectional advancing before deep hard rock tunnel holing-through. The method includes arranging a micro-seismic sensor at the rear of each tunnel face when the distance between the two oppositely advanced tunnel faces is equal to a preset times the diameter of a hole of a tunnel; analyzing monitored micro-seismic signals generated by micro-fracture of rock mass; measuring coordinates of the mounting position of each micro-seismic sensor; acquiring rock micro-fracture positions by means of inversion; computing apparent volume and micro-seismic energy released by micro-fracture; perpendicularly projecting all the rock micro-fracture positions between the two tunnel faces onto the central axis of the tunnel; computing distances among all adjacent projection points until all the distances are not larger than preset spacing; changing opposite advancing into unidirectional advancing. The method has the advantages that rock pillar type burst risks can be reduced, and the construction progress can be accelerated to the greatest extent; advancing is selectively carried out on the tunnel faces with low micro-seismic activity intensity, accordingly, the rock pillar type burst risks are low and can be further decreased, and the safety of construction personnel and the safety of equipment can be guaranteed.

Description

technical field [0001] The invention relates to a construction method before a tunnel is penetrated, and in particular to a method for determining the timing and mode of excavation from opposite direction to one direction before the penetration of a deep hard rock tunnel. It is suitable for deep-buried tunnels such as water conservancy and hydropower, transportation, etc. that are excavated in opposite directions. Background technique [0002] In order to speed up the construction progress, tunnel excavation often adopts the method of opposite excavation, that is, excavation is carried out simultaneously from two opposite directions of the tunnel until it is penetrated. Before the tunnel is penetrated, the simultaneous excavation of the two tunnel faces will cause the stress field and energy superposition of the rock pillar between the two tunnel faces, resulting in severe damage to the rock pillar. During the penetration process of deep-buried hard rock tunnels, the opposi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00
Inventor 冯夏庭丰光亮肖亚勋赵周能
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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