CN105259051A - Method for quickly testing mechanical property of engineering rock - Google Patents
Method for quickly testing mechanical property of engineering rock Download PDFInfo
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- CN105259051A CN105259051A CN201510785947.2A CN201510785947A CN105259051A CN 105259051 A CN105259051 A CN 105259051A CN 201510785947 A CN201510785947 A CN 201510785947A CN 105259051 A CN105259051 A CN 105259051A
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Abstract
The invention discloses a method for quickly testing the mechanical property of an engineering rock and belongs to an engineering test method. The method comprises the steps that (1) drilling positions are determined, and drilled holes are arranged in the mode of different distances between the drilled holes and the working face in a roadway; (2) the drilled holes are peeped by using an imager; (3) experimental points of an elastic modulus instrument and a shear instrument are determined according to the drilled hole peeping conditions; (4) drilling, shearing and elastic modulus experiments are performed; (5) analysis of experimental data is performed. According to the method, drilling is performed in the roadway, the development conditions and damage characteristics of the inner structural surfaces of the drilled holes are obtained through a drilling and peeping instrument and are used as the point selection basis of the elastic modulus and shear experiments, the elasticity modulus, internal friction angle and cohesive force of a surrounding rock of the roadway are measured by the elastic modulus instrument and the shear instrument, and the elasticity modulus, internal friction angle and cohesive force of the surrounding rock of the roadway and damage characteristics and their internal relation under the influence of different mining degrees are determined through analysis and comparison of different drilling data. The method has important guiding significance on roadway supporting and effect analysis, reinforcing and supporting design and the like and is simple and convenient to operate, required time is short, and the data are reliable.
Description
Technical field
The present invention relates to a kind of method for rapidly testing of country rock, particularly a kind of method for rapidly testing of engineering rock mass mechanical characteristic.
Background technology
Due to in-situ testing technique can overcome shop experiment perturbation, size effect, rock mass original structure cannot be kept, the shortcoming such as original water percentage and original stress state, develop into a kind of important Mechanics Parameters of Rock Mass value means gradually.At present, the test of colliery engineering Rock Nature adopts laboratory sillar test, and bullet mould instrument, boxshear apparatus are conventional in-situ test instruments, and play the elastic modulus that mould instrument can measure rock mass, boxshear apparatus can measure angle of internal friction, the cohesion of rock mass.
Colliery is because of its singularity, and the definite boundary of tunnel adjoining rock cannot be determined, by digging disturbing influence, roadway surrounding rock is also incomplete, there is absciss layer, fracture area in country rock.Structural plane development condition and the destructive characteristicss thereof such as directly perceived, the clear display boring of imager energy interior rock stratification, joint, crack, be therefore widely used in field, colliery, as the important means of geologic condition assessment in roadway support design.If boxshear apparatus, bullet mould instrument are applied to colliery, first must determine lithology and structure, the collapse state of testing measuring point, imager is its important supplementary means.Under workplace mining influence, tunnel is by lead abutment pressure effect, and surrouding rock deformation increases, cranny development, degree of crushing increases, integrality is deteriorated, and Mechanical property also changes a lot, if the roadway surrounding rock Mechanics Parameters of Rock Mass that can record under mining influence and destructive characteristics, take at the pick lane initial stage, design enough supporting intensities, just surrouding rock deformation can be controlled in the reasonable scope, be conducive to mine safety High-efficient Production.
Summary of the invention
The object of the invention is the method for rapidly testing that a kind of engineering rock mass mechanical characteristic will be provided, the quick test of roadway surrounding rock engineering mechanical properties and destructive characteristics under mining influence, obtain rock mass angle of internal friction, cohesion, elastic modulus and destructive characteristics and the situation of change with the advance of the face, for roadway support conceptual design, supporting effect of roadway evaluation, reinforce support conceptual design provide foundation.
The object of the present invention is achieved like this, and method for rapidly testing concrete steps are as follows:
Step one, determine each bore position, hole and to arrange apart from workplace different distance in tunnel; Described different distance is along stress-concentrated area, workplace front to stress constant region;
Step 2, utilize imager to carry out boring to spy on, and record separatrix, rock stratum and borehole wall complete segment, reduction stage depth range, preserve boring and spy on video file;
Step 3, spy on situation according to boring, select borehole wall rock complete segment as bullet mould instrument, shear instrument experimental point;
Step 4, carry out boring elastic modulus, shearing experiment, record boring numbering, the measuring point degree of depth, measuring point lithology, and stress, the experiment of bullet mould displacement, the tangential stress of normal stress, shear test;
Step 5, analysis of experimental data: process experimental data, by different borehole data comparative analysis, obtain the impact of different operating face mining degree, comprise the elastic modulus of roadway surrounding rock engineering mechanics in faint mining influence situation, angle of internal friction, cohesion characteristic, destructive characteristics and contact therebetween.
Beneficial effect: boring elastic modulus instrument, boxshear apparatus are introduced into field, colliery by this method, in conjunction with imager, roadway surrounding rock engineering mechanical properties and destructive characteristics are being tested, consider working face extraction to destroy and the impact of Mechanics Parameters of Rock Mass roadway surrounding rock, shop experiment perturbation, size effect can be overcome, rock mass original structure cannot be kept, the shortcoming such as original water percentage and original stress state, to roadway support design, supporting effect evaluation, reinforce support design etc., there is great importance.Advantage: the used time is short, data reliability improves greatly.
Accompanying drawing explanation
Fig. 1 plays mould instrument schematic diagram.
Fig. 2 is boxshear apparatus schematic diagram.
Fig. 3 is imager schematic diagram.
In figure, 1-pops one's head in, 2-panel board, 3-push rod, 4-cable, 5-high-pressure oil passage, 6-hand driven high pressure pump, 7-leveling pallet, 8-lifting jack, 9-hold-down nut, 10-depth encoder, 11-drum.
Embodiment
Method for rapidly testing concrete steps are as follows:
Step one, determine each bore position, hole and to arrange apart from workplace different distance in tunnel; Described different distance is along stress-concentrated area, workplace front to stress constant region;
Step 2, utilize imager to carry out boring to spy on, and record separatrix, rock stratum and borehole wall complete segment, reduction stage depth range, preserve boring and spy on video file;
Step 3, spy on situation according to boring, select borehole wall rock complete segment as bullet mould instrument, shear instrument experimental point;
Step 4, carry out boring elastic modulus, shearing experiment, record boring numbering, the measuring point degree of depth, measuring point lithology, and stress, the experiment of bullet mould displacement, the tangential stress of normal stress, shear test;
Step 5, analysis of experimental data: process experimental data, by different borehole data comparative analysis, obtain the impact of different operating face mining degree, comprise the elastic modulus of roadway surrounding rock engineering mechanics in faint mining influence situation, angle of internal friction, cohesion characteristic, destructive characteristics and contact therebetween.
The method obtains roadway surrounding rock geologic feature and destructive characteristics by imager, obtains roadway surrounding rock elastic modulus, angle of internal friction, cohesion by boxshear apparatus, bullet mould instrument;
The method by boring spy on the borehole wall obtained be characterized as play mould instrument, boxshear apparatus experiment reconnaissance provides foundation.
The method, by arranging a series of borings apart from workplace different distance (along stress-concentrated area, workplace front to stress constant region) in tunnel, determines the impact of different mining degree lower roadway surrounding rock elastic modulus, angle of internal friction, cohesion and destructive characteristics and inner link thereof.
Embodiment 1: method step is as follows:
(1) first step: determine each bore position
Boring is arranged apart from workplace different distance (along stress-concentrated area, workplace front to stress constant region) in tunnel, example: arrange boring 5 at back, distance workplace distance is respectively: 5m, 15m, 30m, 50m, 80m, boring is arranged in back, diameter 76mm, hole depth 7m, tests after pore-forming immediately.
(2) second step: utilize imager to carry out boring and spy on
1 probe is constantly advanced by 3 push rods, filmed image by 4 cable transmission to 2 panel boards, hole wall rock bedding, joint, cranny development situation and residing position thereof directly can be observed by panel board, in putting strokes, (paper pen) records separatrix, rock stratum and borehole wall complete segment, reduction stage depth range, preserves data file after end is spied in boring.
(3) the 3rd steps: determine boring elastic modulus, shear test point
Record is spied on according to boring in step 2, select borehole wall complete segment as bullet mould instrument, shear instrument experimental point, a measuring point can only do and once play mould experiment or shearing experiment, shearing experiment can rotate 45 ° to obtain maximum 4 measuring points in the same degree of depth, measuring point number should be tried one's best many, to balance stochastic error (bullet mould is tested 1 measuring point and obtained 1 group of data, and shearing experiment 4 that apply different normal stress or more measuring point obtains one group of data);
(4) the 4th steps: carry out boring elastic modulus, shear test
Carry out boring elastic modulus, shearing experiment successively, record boring numbering, the measuring point degree of depth, measuring point lithology and instrument data.Bullet mould is tested: by 3 push rods, 1 probe is delivered to optional test point, giving primary stress by 6 hand driven high pressure pumps makes probe fix, be forced into maximum stress (example: 2Mpa step by step, 5Mpa, 10Mpa ..., maximum stress is depending on lithology), step by step reduce pressure (to 0Mpa), record stress value and corresponding displacement by panel board 2, release oil return, repeats above-mentioned steps until all measuring point terminates; Shearing experiment: probe is delivered to optional test point by push rod 3, applying normal stress by 6 hand driven high pressure pumps makes probe fix, 7 leveling pallets, 8 lifting jack, 9 hold-down nuts are installed successively, continue to be pumped to default normal stress value, apply tangential stress, record maximum shear stress value and correspondent method to stress value, release oil return, carry out next measuring point test, until all measuring point terminates.
(5) the 5th steps: analysis of experimental data
Drawing stress-displacement curve (play mould experiment) with normal stress-tangential stress curve (shearing experiment) calculates elastic modulus, angle of internal friction, cohesion, video recording is spied on according to boring, hole wall stretch-out view is to rock stratification, joint, the structural plane development conditions such as crack and destructive characteristics thereof are analyzed, by different borehole data comparative analysis, (comprising faint mining influence situation) roadway surrounding rock engineering mechanical properties (elastic modulus under the mining degree impact of acquisition different operating face, angle of internal friction, cohesion), destructive characteristics and contact therebetween.
Claims (1)
1. a method for rapidly testing for engineering rock mass mechanical characteristic, is characterized in that: method for rapidly testing concrete steps are as follows:
Step one, determine each bore position, hole and to arrange apart from workplace different distance in tunnel; Described different distance is along stress-concentrated area, workplace front to stress constant region;
Step 2, utilize imager to carry out boring to spy on, and record separatrix, rock stratum and borehole wall complete segment, reduction stage depth range, preserve boring and spy on video file;
Step 3, spy on situation according to boring, select borehole wall rock complete segment as bullet mould instrument, shear instrument experimental point;
Step 4, carry out boring elastic modulus, shearing experiment, record boring numbering, the measuring point degree of depth, measuring point lithology, and stress, the experiment of bullet mould displacement, the tangential stress of normal stress, shear test;
Step 5, analysis of experimental data: process experimental data, by different borehole data comparative analysis, obtain the impact of different operating face mining degree, comprise the elastic modulus of roadway surrounding rock engineering mechanics in faint mining influence situation, angle of internal friction, cohesion characteristic, destructive characteristics and contact therebetween.
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Cited By (5)
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| CN107024396A (en) * | 2017-05-19 | 2017-08-08 | 中国矿业大学 | A kind of rock field shear test strength testing device and method |
| CN108413895A (en) * | 2018-03-14 | 2018-08-17 | 贵州开磷集团股份有限公司 | A kind of endoscope and observation procedure of observation rock mass hole |
| CN109187226A (en) * | 2018-09-06 | 2019-01-11 | 中煤科工集团西安研究院有限公司 | Preboring formula original position rock association formula measuring device and measuring method |
| CN111537699A (en) * | 2020-05-29 | 2020-08-14 | 煤炭科学技术研究院有限公司 | Method for distinguishing hard rock stratum of coal mine through multiple indexes |
| CN111678809A (en) * | 2020-06-17 | 2020-09-18 | 中国矿业大学 | Coal rock internal friction angle and cohesive force testing device and testing method |
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| CN108413895A (en) * | 2018-03-14 | 2018-08-17 | 贵州开磷集团股份有限公司 | A kind of endoscope and observation procedure of observation rock mass hole |
| CN109187226A (en) * | 2018-09-06 | 2019-01-11 | 中煤科工集团西安研究院有限公司 | Preboring formula original position rock association formula measuring device and measuring method |
| CN109187226B (en) * | 2018-09-06 | 2021-05-28 | 中煤科工集团西安研究院有限公司 | Pre-drilling type in-situ rock mass combined measuring device and measuring method |
| CN111537699A (en) * | 2020-05-29 | 2020-08-14 | 煤炭科学技术研究院有限公司 | Method for distinguishing hard rock stratum of coal mine through multiple indexes |
| CN111678809A (en) * | 2020-06-17 | 2020-09-18 | 中国矿业大学 | Coal rock internal friction angle and cohesive force testing device and testing method |
| CN111678809B (en) * | 2020-06-17 | 2021-07-27 | 中国矿业大学 | Coal rock internal friction angle and cohesive force testing device and testing method |
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| CN105259051B (en) | 2018-06-01 |
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