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A method for determining the level of rockbursts occurring in tunnel tbm cutterheads

A determination method and rockburst technology, applied in tunnels, earthwork drilling, mining equipment, etc., can solve the problem of difficulty in accurately determining the rockburst grade in the TBM cutter head, achieve the scientific and accurate rockburst grade determination, and avoid grade determination deviation. , determine the timely effect

Active Publication Date: 2020-08-25
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the level of rockburst in the TBM cutterhead is difficult to accurately determine, and to provide a method for determining the level of rockburst in the tunnel TBM cutterhead

Method used

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  • A method for determining the level of rockbursts occurring in tunnel tbm cutterheads
  • A method for determining the level of rockbursts occurring in tunnel tbm cutterheads

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Embodiment Construction

[0019] Below in conjunction with specific embodiment the present invention is described in further detail:

[0020] Microseismic sensors were installed in a deep TBM tunnel, and microseismic monitoring was carried out for one month. A total of 24 rockbursts of different intensities occurred outside and inside the TBM cutterhead were monitored, of which 15 rockbursts occurred outside the TBM cutterhead;

[0021] Determine the rockburst level by measuring the size of the above-mentioned 15 rockburst craters, the observed ejection of rock blocks, and the size of the sound; after judging, the extremely strong rockburst, strong rockburst, moderate rockburst and slight rockburst are respectively 2 1, 2, 5 and 6;

[0022] The microseismic energy, apparent volume, and magnitude three types of microseismic parameter values ​​released by the above 15 rockbursts of different grades were determined through microseismic monitoring, and are shown in Table 1 after sorting out.

[0023] Tab...

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Abstract

The invention discloses a method for determining grades of rockburst occurring in a tunnel TBM cutterhead. The method comprises the steps: microearthquake parameters of the different grades of rockburst occurring outside the TBM cutterhead are analyzed through microearthquake monitoring, average values and discrete coefficients of microearthquake energy, the apparent volume and the earthquake magnitude are calculated, the discrete coefficients of the microearthquake energy, the apparent volume and the earthquake magnitude of the different grades of rockburst are summed, the microearthquake parameters corresponding to the minimum sum of the discrete coefficients serve as microearthquake indexes for determining the grades of rockburst in the TBM cutterhead, and the average value of the microearthquake indexes when the different grades of rockburst occurs serve as the grading standard of the rockburst grades; and difference values between the microearthquake indexes and the grading standard of the different grades of rockburst when rockburst occurs in the TBM cutterhead are calculated, and the rockburst grades corresponding to the minimum difference value are the grades of rockburst.Determination of the grades of rockburst in the TBM cutterhead is feasible, more objective, more accurate and more timely, and the method can be used for monitoring, analysis and treatment of rockburst of tunnel engineering.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, and more particularly relates to a method for determining the grade of a rockburst occurring in a tunnel TBM cutterhead. Background technique [0002] In the development and utilization of underground space, it has become a general development trend to give priority to TBM for rapid construction. Different from the conventional drilling and blasting method, TBM tunneling widely uses high-tech technologies such as electronics, information, telemetry, and remote control to guide and monitor all operations. Its tunneling speed is about 4 to 10 times that of the conventional drilling and blasting method. Underground engineering construction in energy, transportation, urban construction, national defense and other departments. In some developed countries, many construction companies have clearly stipulated that TBM must be used for excavation of tunnels longer than 3km. With the rapid develop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/11E21D9/00
CPCE21D9/003E21D9/11
Inventor 丰光亮冯夏庭陈炳瑞肖亚勋
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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