CN103510951A - Method for locating and installing deep soft rock geostatic stress testing device - Google Patents

Method for locating and installing deep soft rock geostatic stress testing device Download PDF

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Publication number
CN103510951A
CN103510951A CN201310494656.9A CN201310494656A CN103510951A CN 103510951 A CN103510951 A CN 103510951A CN 201310494656 A CN201310494656 A CN 201310494656A CN 103510951 A CN103510951 A CN 103510951A
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China
Prior art keywords
push rod
stress
sensing post
hole
quarter butt
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CN201310494656.9A
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Chinese (zh)
Inventor
张程远
刘泉声
朱元广
陈怡筠
崔先泽
刘小燕
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中国科学院武汉岩土力学研究所
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Priority to CN201310494656.9A priority Critical patent/CN103510951A/en
Publication of CN103510951A publication Critical patent/CN103510951A/en

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Abstract

The invention discloses a method for locating and installing a deep soft rock geostatic stress testing device. According to the method, a stress sensing column is manufactured, the stress sensing column is a cement concrete cylinder comprising two three-directional pressure boxes, and the center of each cubic pressure box is located on the medial axis of the cylinder; the front end of a push rod is connected with the stress sensing column, an angle testing device is installed, rotation angle and length of the stress sensing column are recorded when the push rod is pushed from a hole mouth to a tested point at the hole bottom, and accurate data necessary for stress resolving can be obtained. According to the method, no sharp protrusion exists at the front end or the side face of the stress sensing column, the hole wall will not collapse easily in the pushing process, relative positions of a pair of three-directional pressure sensors are fixed through the stress sensing column, the two three-directional pressure sensors will not move or rotate relatively in the pushing process, and the accuracy for calculating the geostatic stress of the tested point can be ensured.

Description

The locating mounting method of deep soft rock geostatic stress testing arrangement
Technical field
The invention belongs to ground field of measuring technique, relate to particularly a kind of locating mounting method of deep soft rock geostatic stress testing arrangement.
Background technology
The Security Construction of coal mine roadway be unable to do without the effective monitoring to country rock geostatic stress.In the broken weak country rock in deep, colliery, the Validity Test that adopts current common testing methods to carry out geostatic stress is very difficult.The hydraulic fracturing extensively adopting in hard rock of take is example, it is essentially two-dimensional stress measuring method, and its boring packer need to possess good water-stop under high hydraulic pressure, the integrality of rock mass has been proposed to harsh requirement, be not suitable for the broken soft rock mass of deep, colliery developmental joint fissure.In another kind of hard rock, common testing methods is stress relief method.Because core in the loose and soft surrounding rock of deep, colliery is difficult to obtain, be difficult to test and obtain mechanics parameter by uniaxial compression, so stress relief method is also difficult to carry out.Except above-mentioned two kinds indirectly stress test method, also have some direct measureing equipments, for example disclosed a kind of resistance-strain pressing shaft type earth pressure cell of Chinese patent (application number 03212896) and the disclosed a kind of Inflatable double-film water-proof pressure box of Chinese patent (application number 201120082368.9).These observation devices and method only can be measured unidirectional pressure, are mainly the pressure measxurements being applied in the soil body, all can not Validity Test rock mass in the geostatic stress of a certain measuring point.
Wuhan Inst. of Rock and Soil Mechanics, Chinese Academy of Sciences has proposed a kind of " based on flow stress, recovering deep soft rock geostatic stress method of testing and the device of principle " (application number 201210096644.6), utilize the characteristic of deep soft rock rheology under high-ground stress, realize the real-time and long term monitoring of soft rock geostatic stress.When application the method is carried out engineering practice, because soft rock has and test different Some features in hard rock, such as, due to country rock, be mostly the softer rocks such as sandstone, mud stone and calclithite, when pushing sensor (triaxial pressure box) toward horizontal drilling deep, the metal shell of cube shaped is easy to cause the destruction to hole wall, can affect the propelling movement of sensor when serious.On the other hand, due to the distance pushing long (sometimes can reach rice up to a hundred), in propelling movement process, may cause sensor to twist because of reasons such as the rigidity of falling piece extruding, push rod are inadequate.From the angle of calculating, based on flow stress, recover the deep soft rock geostatic stress method of testing of principle when implementing, certainty of measurement requirement to the absolute position of two sensors (triaxial pressure box) and relative angle is very high, therefore need to the physical location in boring accurately locate pressure cell.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of locating mounting method of deep soft rock geostatic stress testing arrangement.By the method, make paired triaxial pressure sensor can relatively fix and can measure and be seated to boring measuring point, realize the measurements and calculations of country rock internal stress value.
The object of the invention is to be achieved through the following technical solutions:
A locating mounting method for deep soft rock geostatic stress testing arrangement, comprises the following steps:
(1) make the cement concrete cylinder that contains a pair of triaxial pressure box, the triaxial pressure sensor of two cube shaped is adjacent to be placed in cylindric concrete, cube center is all on cylindric concrete axis, two any two work plane normals of triaxial pressure box do not overlap, and form sensing post; Place, axis, sensing post bottom surface arranges a groove, and connection cross bar is inside housed;
Prepare push rod, push rod is threaded connection and is formed by more piece quarter butt, and the quarter butt front end of close sensing post has and the connection draw-in groove that is connected the nested connection of cross bar, and the angle-measuring equipment of measuring the anglec of rotation is housed on this quarter butt;
(2) in country rock of soft rock roadway, holing, is test point position at the bottom of hole;
(3) sensing post is put into boring, the connection draw-in groove of push rod front end records push rod initial angle with the place, the nested , of cross bar aperture that is connected of stress sensing post;
(4) sensing post is pushed to foot of hole along boring, wire is drawn outside aperture; After propelling movement completes, record the push rod anglec of rotation and push rod length;
(5) extract push rod, Grouting Pipe is delivered to sensing post place, use Grouting Pipe to start slip casting at the bottom of hole, until complete sealing of hole.
As a kind of, preferably, when described two triaxial pressure boxes are adjacent to be placed on cylinder axis, adopt the mode of installing in opposite directions, ,Cong top, two cube diagonal vertical cylindrical body axis is seen, three crest lines of two sensors differ 60 degree successively.
Two cube centers are all on cylinder axis, and centre distance is 2 ~ 3 times of the cube length of side, and cylinder height is 5 ~ 6 times of the cube length of side.
Described push rod is more piece quarter butt, formation is threaded.In propelling movement process, in hell place, install and connect, push rod is whole constantly to be lengthened, until stress sensing post is pushed to foot of hole, and to adapt to the installation in the little space of coal mine roadway.
Soft rock, after boring, easily occur from avalanche phenomenon, and hole wall is softer, easily avalanche when being subject to external force cutting.Sensing post front end and side that the present invention proposes do not have sharp projection, in propelling movement process, be difficult for causing hole wall avalanche, and sensing post has been fixed the relative position of a pair of triaxial pressure box, in propelling movement process, also there will not be the relative displacement between these two triaxial pressure boxes, be conducive to the calculating of measuring point geostatic stress.Because the diameter of sensing post is just slightly less than boring, as long as a small amount of slip casting just can make the stress of soft rock mass be delivered on sensor, slip casting setting time is short, can make better the measurement of Soft Rock Body internal compressive stress be achieved.Injecting paste material can adopt the cement concrete mortar identical with stress sensing post.
The present invention in fact also provides a kind of pusher of deep soft rock geostatic stress testing arrangement, comprise push rod, described push rod is threaded connection and is formed by more piece quarter butt, quarter butt front end near sensing post has and the connection draw-in groove that is connected the nested connection of cross bar, and the angle-measuring equipment of measuring the anglec of rotation is housed on this quarter butt.
Described angle-measuring equipment can be the angle-measuring equipment of measurement with gravity direction angle.
The present invention has following advantage and beneficial effect: 1. sensing post can smooth-goingly be holed and be arrived test point by soft rock, is easy to site operation; 2. sensor group is solidified in advance, can control and be difficult for changing.3. the depth location of sensor and the anglec of rotation can accurately obtain, and are easy to resolve test point geostatic stress value, are conducive to calculating and the Stability Analysis of The Surrounding Rock of geostatic stress.
Accompanying drawing explanation
Fig. 1 is the structural representation of stress sensing post in soft rock geostress survey,
1-sensing post, 2-triaxial pressure box, 3-triaxial pressure box.
Fig. 2 is stress sensing post and pusher structural representation.
1-sensing post, 4-connects cross bar, and 5-connects draw-in groove, 6-angle-measuring equipment, 7-push rod, 8-wire.
Fig. 3 be quarter butt connection draw-in groove be connected cross bar partial schematic diagram.
1-sensing post, 4-connects cross bar, and 5-connects draw-in groove, 7-push rod.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
The locating mounting method that the invention discloses a kind of deep soft rock geostatic stress testing arrangement, comprises the following steps:
(1) make the cement concrete cylinder 1 that contains a pair of triaxial pressure box, cylinder diameter is than measuring the little 0.5 ~ 1cm of bore diameter, the triaxial pressure sensor 2 of two cube shaped, 3 are adjacent to be placed in cylindric concrete, cube center is all on cylindric concrete axis, two any two work plane normals of triaxial pressure box do not overlap, and form sensing post (as shown in Figure 1); Place, axis, sensing post rear end arranges a groove, is inside equipped with and connects cross bar 4; Push rod 7 is threaded connection and is formed by more piece quarter butt, have and the connection draw-in groove 5 that is connected the nested connection of cross bar, and the angle-measuring equipment 6(that the measurement anglec of rotation is housed on this quarter butt as shown in Figure 2 near the quarter butt front end of sensing post);
(2) in country rock of soft rock roadway, holing, is test point position at the bottom of hole;
(3) sensing post is put into boring, the connection draw-in groove 5 of push rod 7 front ends records push rod initial rotation angle degree with the place, cross bar 4 nested (as shown in Figure 3) , aperture that is connected of sensing post;
(4) sensing post 1 is pushed to foot of hole along boring, wire 8 is drawn outside aperture; After propelling movement completes, record the push rod anglec of rotation and push rod length;
(5) extract push rod, Grouting Pipe is delivered to stress sensing post place, use Grouting Pipe to start slip casting at the bottom of hole, until complete sealing of hole.
 
Embodiment 1
First make sensing post 1.For 800-1000 rice deep measures stratum soft rock, use C5 label concrete mortar (cement and fine sand preparation) by the triaxial pressure box 2 of two squares and 3 parcels, to form concrete cylindrical, diameter 125mm.The center of the triaxial pressure sensor of two square shapes is all on the axis of cylindric concrete bodies.Stress sensing post 1 is drawn the place, axis of one end of triaxial pressure box 2 and 3 wires, forms a cylindrical grooves when building, degree of depth 8cm, and diameter is identical with push rod 7 external diameters, is 5cm.In groove, along body diameter, be fixed with the connection cross bar 4 that a stainless steel is made.Sensing post 1 adds water curing to 30 ~ 60% of normal intensity, stand-by.
Push rod 7 is used the stainless steel tube of hollow to make, and front end tube wall diameter two ends are cut with the connection draw-in groove 5 of U font, length 5cm vertically.Push rod 7 is provided with the angle-measuring equipment 6 according to gravity measurement angle apart from front end 20cm place, adopts FEC-60 type angular instrument and the push rod 7 of state section warship boat coaxially to install.Push rod 7 is more piece quarter butt form, the long 150cm of every joint, and the first segment Wai,Mei Jie two ends of removing connection stress sensing post are screw thread and interconnect.
When in colliery, 800 meters of Deep Soft Rock Tunnel are applied, about 4 meters of tunnel diameter, 30 meters of drilling depths, aperture 130mm, after cleaning bottom of hole, stress sensing post 1 is put into hole, outside triaxial pressure box 2 and 3 wire 8 extend backwards and portal, push rod 7 front end first segments are connected cross bar 4 connections by connecting draw-in groove 5 with stress sensing post 1, and use angle-measuring equipment 6 records push rod 7 initial rotation angle degree .After pushing in hole, each joint push rod 7 all connects in hell place, and push rod is whole constantly to be lengthened, until stress sensing post 1 is pushed to foot of hole test point place, records the final anglec of rotation of push rod 7 , and the actual use length L of push rod 7, in order to calculating, use.Extract push rod 7, Grouting Pipe is delivered to stress sensing post 1 place, closed orifices ,Cong starts slip casting at the bottom of hole, employing be the C5 label cement fine sand slurry of Site.Slip casting simultaneously Grouting Pipe is slowly extracted out to aperture, until slip casting completes, and sealing of hole completely.After initial set, can monitor by wire.
During concrete calculating geostatic stress, take drilling orifice center as initial point, tunnel, place, axis direction WeiXZhou, aperture, tunnel circumference is tangentially Y-axis, and borehole axial is that Z axis is set up coordinate system, and applied stress sensing post 1 pushes poor (the final anglec of rotation of front and rear angles -initial rotation angle degree ) and the degree of depth L of stress sensing post 1 in hole, the geostatic stress that obtains a geometry attitude ,Gong hole bill kept on file measuring point of sensing post 1 resolves.

Claims (5)

1. a locating mounting method for deep soft rock geostatic stress testing arrangement, is characterized in that, comprises the following steps:
(1) make the cement concrete cylinder that contains a pair of triaxial pressure box, the triaxial pressure sensor of two cube shaped is adjacent to be placed in cylindric concrete, cube center is all on cylindric concrete axis, two any two work plane normals of triaxial pressure box do not overlap, and form sensing post; Place, axis, sensing post bottom surface arranges a groove, and connection cross bar is inside housed;
Prepare push rod, push rod is threaded connection and is formed by more piece quarter butt, and the quarter butt front end of close sensing post has and the connection draw-in groove that is connected the nested connection of cross bar, and the angle-measuring equipment of measuring the anglec of rotation is housed on this quarter butt;
(2) in country rock of soft rock roadway, holing, is test point position at the bottom of hole;
(3) sensing post is put into boring, the connection draw-in groove of push rod front end records push rod initial angle with the place, the nested , of cross bar aperture that is connected of stress sensing post;
(4) sensing post is pushed to foot of hole along boring, wire is drawn outside aperture; After propelling movement completes, record the push rod anglec of rotation and push rod length;
(5) extract push rod, Grouting Pipe is delivered to sensing post place, use Grouting Pipe to start slip casting at the bottom of hole, until complete sealing of hole.
2. locating mounting method according to claim 1, is characterized in that, the ,Cong top, two cube diagonal vertical cylindrical body axis of described two triaxial pressure boxes sees, three crest lines of two sensors differ 60 degree successively.
3. locating mounting method according to claim 1, is characterized in that, two cube centre distance is 2 ~ 3 times of the cube length of side, and cylinder height is 5 ~ 6 times of the cube length of side.
4. locating mounting method according to claim 1, is characterized in that, in step (5), injecting paste material adopts the cement concrete mortar identical with making stress sensing post.
5. the pusher of a deep soft rock geostatic stress testing arrangement, comprise push rod (7), described push rod (7) is threaded connection and is formed by more piece quarter butt, quarter butt front end near sensing post has and the connection draw-in groove (5) that is connected the nested connection of cross bar (4), and the angle-measuring equipment (6) of measuring the anglec of rotation is housed on this quarter butt.
CN201310494656.9A 2013-10-21 2013-10-21 Method for locating and installing deep soft rock geostatic stress testing device CN103510951A (en)

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Cited By (10)

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Publication number Priority date Publication date Assignee Title
CN105201434A (en) * 2015-10-16 2015-12-30 中国科学院武汉岩土力学研究所 Pushing and positioning device and method of hollow inclusion in deep hole ground stress test
CN106644203A (en) * 2016-11-24 2017-05-10 中国科学院武汉岩土力学研究所 Stress sensitive element based on three-dimensional optical fiber stress sensor
CN106677723A (en) * 2017-02-21 2017-05-17 李广连 Location measuring device for oil well electric push rod
CN106772613A (en) * 2016-12-30 2017-05-31 中国科学院武汉岩土力学研究所 A kind of rock mass scene acoustic emission monitor(ing) sensor pushes localization method and device
CN107288612A (en) * 2017-05-03 2017-10-24 同济大学 Installation device of sensor is tested in a kind of hole internal vibration
CN107588876A (en) * 2017-09-09 2018-01-16 韩少鹏 Ground exploration engineering soft rock detecting earth stress method
CN107643139A (en) * 2017-09-09 2018-01-30 韩少鹏 Exploration engineering soft rock detecting earth stress device
CN107817069A (en) * 2017-09-23 2018-03-20 韩少鹏 Exploration engineering soft rock detecting earth stress device
CN107063525B (en) * 2017-06-25 2018-04-20 中国科学院武汉岩土力学研究所 A kind of fiber Bragg grating type six for deep soft rock stress measurement is to pressure sensor
CN110307924A (en) * 2019-06-21 2019-10-08 三峡大学 A kind of device and method measuring stress field of the surrounding rock principal stress

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105201434A (en) * 2015-10-16 2015-12-30 中国科学院武汉岩土力学研究所 Pushing and positioning device and method of hollow inclusion in deep hole ground stress test
CN105201434B (en) * 2015-10-16 2017-09-19 中国科学院武汉岩土力学研究所 The push of hollow inclusion and positioner and method in a kind of deep hole detecting earth stress
CN106644203A (en) * 2016-11-24 2017-05-10 中国科学院武汉岩土力学研究所 Stress sensitive element based on three-dimensional optical fiber stress sensor
CN106644203B (en) * 2016-11-24 2019-02-19 中国科学院武汉岩土力学研究所 A kind of stress sensitive element based on three-dimensional fiber crustal stress sensor
CN106772613A (en) * 2016-12-30 2017-05-31 中国科学院武汉岩土力学研究所 A kind of rock mass scene acoustic emission monitor(ing) sensor pushes localization method and device
CN106677723A (en) * 2017-02-21 2017-05-17 李广连 Location measuring device for oil well electric push rod
CN107288612A (en) * 2017-05-03 2017-10-24 同济大学 Installation device of sensor is tested in a kind of hole internal vibration
CN107288612B (en) * 2017-05-03 2020-09-18 同济大学 Mounting device for vibration test sensor in hole
CN107063525B (en) * 2017-06-25 2018-04-20 中国科学院武汉岩土力学研究所 A kind of fiber Bragg grating type six for deep soft rock stress measurement is to pressure sensor
CN107588876A (en) * 2017-09-09 2018-01-16 韩少鹏 Ground exploration engineering soft rock detecting earth stress method
CN107643139A (en) * 2017-09-09 2018-01-30 韩少鹏 Exploration engineering soft rock detecting earth stress device
CN110608835A (en) * 2017-09-09 2019-12-24 韩少鹏 Soft rock ground stress testing device and soft rock ground stress testing method for geotechnical exploration engineering
CN107588876B (en) * 2017-09-09 2020-04-28 核工业柳州工程勘察院 Soft rock ground stress testing method for geotechnical exploration engineering
CN107643139B (en) * 2017-09-09 2020-09-18 吉安县裕兴科技有限公司 Exploration engineering soft rock ground stress testing device
CN110608835B (en) * 2017-09-09 2021-03-09 山东东信岩土工程有限公司 Soft rock ground stress testing device and soft rock ground stress testing method for geotechnical exploration engineering
CN107817069B (en) * 2017-09-23 2020-05-22 广东建瀚工程管理有限公司 Exploration engineering soft rock ground stress testing device
CN107817069A (en) * 2017-09-23 2018-03-20 韩少鹏 Exploration engineering soft rock detecting earth stress device
CN110307924A (en) * 2019-06-21 2019-10-08 三峡大学 A kind of device and method measuring stress field of the surrounding rock principal stress
CN110307924B (en) * 2019-06-21 2021-02-02 三峡大学 Device and method for measuring main stress of surrounding rock stress field

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