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Variable ground pressure tunnel excavating load experiment platform

A technology for test benches and tunnels, applied in the direction of applying stable tension/pressure to test material strength, measuring devices, instruments, etc., can solve problems such as roadheader stalling, changes, and low efficiency

Active Publication Date: 2017-01-11
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the rapid tunneling construction of coal mine roadway, during the tunneling process of the roadheader, due to changes in the density of the rock mass, the depth of the roadway, and the characteristics of the geological conditions in the geological layer, the distribution and magnitude of the stress load on the tunneling face will change suddenly, and the surrounding rock of the tunneling surface will Significant changes in ground stress can easily cause roadheaders to stall and slow down the speed of tunneling operations, seriously affecting the speed of mine construction
In order to avoid problems such as high failure rate, poor reliability, and low efficiency of the roadheader in the face of variable ground pressure and surrounding rock during the excavation process, it is necessary to analyze the overall machine failure caused by the change of ground stress during the excavation and cutting of the surrounding rock. Systematic testing of the dynamic characteristics, which must consider the force transmission characteristics of the roadheader during the cutting process of the surrounding rock working face with different ground stress, and design the dynamic scheme of the roadheader

Method used

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  • Variable ground pressure tunnel excavating load experiment platform
  • Variable ground pressure tunnel excavating load experiment platform
  • Variable ground pressure tunnel excavating load experiment platform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Based on the common complex geological conditions in coal mining roadway excavation construction, that is, the ratio of soft soil to hard rock is 3:7, the initial stress pressure to be loaded is selected, and different ground stresses are realized according to the set stress change curve through the control system. Loading over time. Utilize the first hydraulic cylinder 6 to carry out pressure loading on the simulated rock wall assembly 3; Feedback test data through the first three-way force sensor 9 and the second three-way force sensor 14 to simulate the roadway surrounding rock stress conditions in the excavation process; through the temperature sensor 30 record the change of the working temperature of the reducer 29 under the predetermined construction environment, and draw the temperature change curve; monitor the torque and the change of the rotational speed of the second motor 32 through the torque sensor 33, detect, record and count the test data, Analyze the fo...

Embodiment 2

[0040] In this implementation case, the ratio of soft soil to hard rock under geological conditions is kept at 3:7, and the first hydraulic cylinder 6 is divided into upper and lower groups during the process of pressure loading, which are named group A and group B. , each applying a different pressure value and splitting it into two different cases: pitch and roll.

[0041] Pitching situation: before the drive of the excavation and cutting propulsion mechanism, the pressure loading value of the first hydraulic cylinder 6 of group A is adjusted to make its pressure loading value smaller than that of the first hydraulic cylinder 6 of group B, so that the simulated rock wall assembly 3 and There is a certain elevation angle between the bottom plates 1, on this basis, adjust the rotational speed of the second motor 32, record the pressure value changes of the first three-axis force sensor 9 and the second three-axis force sensor 14, and draw the pressure change curve.

[0042] In...

Embodiment 3

[0044] In this implementation case, the content of hard rock in the geological conditions changes from 70% to 95%. By changing the pressure loading value of the first hydraulic cylinder 6 on the simulated rock wall component 3, the tunneling required by the tunneling machine during the tunneling process is reduced. Cutting force, in order to simulate the sudden change of geological conditions.

[0045] The tunneling load test bench of the variable ground pressure roadway of the present invention can simulate the tunneling process of the shield tunneling machine under the condition that the ground stress does not change, the geological conditions do not change, and the speed of the roadheader does not change. The ground stress does not change, the geological conditions do not change, and the roadheader changes. The tunneling process under the condition of rotating speed, etc.; in the simulation process, the control system is used to record and extract the data of each sensor, co...

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Abstract

A variable ground pressure tunnel excavating load experiment platform comprises a bottom plate, a simulated rock assembly is arranged on the bottom plate, and the bottom of the simulated rock assembly is supported through a supporting mechanism; one side of the simulated rock assembly is provided with a hydraulic cylinder propulsion mechanism for loading the simulated rock assembly, and the other side of the simulated rock assembly is provided with an excavation cutting propulsion mechanism for cutting the simulated rock assembly, so that the similarity experiments of the operating load conditions of a heading machine in the variable ground pressure surrounding rock excavation process are conducted, the research on the load dynamic characteristics of an excavation cutting device in the excavation process is carried out, the force transmission characteristics qualitative analysis of the excavation cutting propulsion mechanism in the loading excavation process is achieved so as to verify the dynamics analysis design scheme of the heading machine under the load-change working condition.

Description

technical field [0001] The invention relates to the technical field of coal mining roadway excavation engineering, in particular to a variable ground pressure roadway excavation load test bench. Background technique [0002] In the rapid tunneling construction of coal mine roadway, during the tunneling process of the roadheader, due to changes in the density of the rock mass, the depth of the roadway, and the characteristics of the geological conditions in the geological layer, the distribution and magnitude of the stress load on the tunneling face will change suddenly, and the surrounding rock of the tunneling surface will Significant changes in ground stress can easily cause roadheaders to stall, and the speed of tunneling operations to slow down, which seriously affects the speed of mine construction. In order to avoid problems such as high failure rate, poor reliability, and low efficiency of the roadheader in the face of variable ground pressure and surrounding rock dur...

Claims

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Application Information

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IPC IPC(8): G01N3/10
CPCG01M99/005G01M99/007
Inventor 郭辰光张鹏李源
Owner LIAONING TECHNICAL UNIVERSITY
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