Method for determining reasonable empty-support distance of tunneling head

An empty roof and roadway technology, which is applied in the field of coal mine roadway excavation technology, can solve the problems of difficult selection of mechanical parameters, poor reliability, and large test workload, and achieve the effect of avoiding tediousness, high reliability, and simple method

Active Publication Date: 2010-10-13
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, using the existing numerical software to determine the empty head distance by demonstrating the stability of the direct head has problems such as large experimental workload, difficult selection of mechanical parameters, and poor reliability.

Method used

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  • Method for determining reasonable empty-support distance of tunneling head
  • Method for determining reasonable empty-support distance of tunneling head
  • Method for determining reasonable empty-support distance of tunneling head

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Embodiment Construction

[0019] Implementation of the present invention will be further described below in conjunction with accompanying drawing:

[0020] (1) Sampling the rock directly on top of the roadway to measure its uniaxial compressive strength and tensile strength. The direct roof of the mining roadway in the 9802 working face of a mine is mudstone with a thickness of 2.54m, and the basic roof is medium-fine sandstone with a thickness of 35m. The uniaxial compressive strength and tensile strength of the immediate roof of the mudstone determined by the test are 21.87MPa and 0.9MPa, respectively.

[0021] (2) Carry out the force analysis of the direct roofing of the tunneling head-on roadway, and establish a number of direct roofing mechanical models with an integer number of bolt row spacing S (the distance between two adjacent rows of bolts) as the empty roof distance. 9802 working face back mining roadway bolt row distance S = 1m. The on-site construction found that the stability of the hea...

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Abstract

The invention relates to a method for determining the reasonable empty-support distance of a tunneling head. The method comprises the following steps of: firstly, sampling immediate roof rock of a tunnel, measuring uniaxial compressive strength and tensile strength through mechanical tests; analyzing the stress of the immediate roof and the tunneling head, building an immediate roof mechanical model along the tunnel, carrying out stress function solution by using a difference method and mathematical software, and calculating stress component of each node in the model; judging stability of the immediate roof in the empty-support range according to the rock strength determined by the tests; and finally, selecting the reasonable empty-support distance according to the maximum tunneling length completed by a production class. The method for the head-on reasonable empty-support distance of the tunneling head overcomes blindness of selecting the empty-support distance, realizes quantitative analysis of empty-support distance selection, and provides important basis for safely and quickly tunneling tunnels. The method has the advantages of simpleness, easy practice, low cost and high reliability, and provides a new way for determining the reasonable empty-support distance.

Description

technical field [0001] The invention relates to a coal mine roadway excavation process, in particular to a method for determining a reasonable head-to-head distance of the roadway excavation. Background technique [0002] In coal mine roadway excavation, it is very important to determine the reasonable head distance of the roadway excavation. If the head distance is large, it will easily cause accidents, and if the head distance span is small, it will affect the production progress. The numerical calculation software (UDEC, FLAC, etc.) currently used to analyze the stability of the roof under the condition of an empty roof requires a large number of tests to obtain the elastic modulus, Poisson's ratio, cohesive force, internal friction angle, dilation angle, and tensile strength. and other surrounding rock mechanical parameters, and these parameters cannot be directly applied to the numerical simulation. It is necessary to carry out back calculation according to the deformat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D20/00
Inventor 柏建彪肖同强李磊王襄禹徐营董正筑
Owner CHINA UNIV OF MINING & TECH
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