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In-situ testing method for deep underground engineering during rockburst preparation and evolution process

A technology of evolution process and in-situ testing, applied in basic structure engineering, on-site foundation soil survey, earthwork drilling and mining, etc., can solve problems that have not been reported in the literature, and achieve the goal of improving reliability, facilitating mutual verification and comparative analysis Effect

Inactive Publication Date: 2010-12-15
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, in the actual deep underground engineering site, there have been no relevant literature reports on the in-situ test of the rockburst breeding and evolution process.

Method used

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  • In-situ testing method for deep underground engineering during rockburst preparation and evolution process
  • In-situ testing method for deep underground engineering during rockburst preparation and evolution process
  • In-situ testing method for deep underground engineering during rockburst preparation and evolution process

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specific Embodiment

[0030] In this example, a rockburst in-situ test was carried out on the excavation process of a tunnel with a depth of 2370m. The layout of the tunnel and monitoring boreholes is as follows: Figure 4 As shown, the diameter of test tunnel 1 is 7.5×8.0m, and the specific steps and methods are as follows:

[0031] (1) A test branch tunnel 2 parallel to the test tunnel 1 was excavated at a distance of 25m from the side of the test tunnel 1, and the floor of the test branch tunnel 2 was 1.5m higher than the floor of the test tunnel 1;

[0032] (2) Select Figure 4 The monitoring section is arranged in the area of ​​4.0m in the excavation direction of the test tunnel 1 shown, and the test branch hole 2 is drilled in the direction of the test tunnel 1, and a series of test holes with a downward slope of 2° are arranged, that is, the sliding micrometer hole 3 and the digital camera hole 4 and acoustic wave holes 5, and radially distributed microseismic test holes 6. The bottom of t...

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Abstract

The invention relates to an in-situ testing method for deep underground engineering during a rockburst preparation and evolution process. The method comprises the following steps of excavating test branch tunnels, designing and laying testing bore holes, and selecting and testing test items. In the method, before excavating the test tunnels, monitoring bore holes and a testing sensor are preset and pre-embedded respectively along the direction of the test tunnels through the test branch tunnels; by adopting the combined in-situ testing method, variation characteristics of elastic waves, cracks, deformation and energy release rate of surrounding rock at monitored section areas of the test tunnels can be directly and continuously obtained in real time and in situ; and in-situ information of the test tunnels during the whole process of rockburst preparation and evolution in the case of excavation is obtained by testing, and comprehensive precursory rockburst basic data is acquired. The in-situ testing method of the invention is concise in technical scheme and reliable in testing instrument and can ensure comprehensive acquisition and comparative analysis of rock mass information during the rockburst preparation and evolution process; and the method can be widely applied to deep underground rock excavation engineering such as an underground testing ground, water conservancy and hydropower, traffic, mine and the like.

Description

technical field [0001] The invention relates to an in-situ test method for the breeding and evolution process of rockbursts in deep underground engineering. The method can be widely used in deep underground rock excavation projects such as underground test sites, water conservancy and hydropower, transportation, and mines. Background technique [0002] Rockburst refers to the dynamic phenomenon in which rock blocks are broken and ejected due to the sudden release of surrounding rock stress during the excavation of deep underground engineering. With the development of human society, more and more engineering constructions have been carried out in deep underground, such as underground tunnels and workshops in water conservancy and hydropower projects, deep tunnels in traffic engineering, deep mining in mining engineering, energy storage and nuclear engineering. Caverns in the deep disposal of waste materials, and deep underground laboratories, a deep science program that satis...

Claims

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Application Information

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IPC IPC(8): E02D1/00E21F17/18
Inventor 冯夏庭李邵军
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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