CN109991104A - The staight scissors test device and its test method of Rock And Soil bulk material under Freezing-Melting Condition - Google Patents
The staight scissors test device and its test method of Rock And Soil bulk material under Freezing-Melting Condition Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0254—Biaxial, the forces being applied along two normal axes of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0284—Bulk material, e.g. powders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The invention belongs to the mechanical test technical fields for bulk material of digging up mine, it is related to the staight scissors test device and its test method of Rock And Soil bulk material under Freezing-Melting Condition, including stress loading system, test specimen control system, cold and hot temperature control circulation system, data collection system, it is analyzed by the direct shearing test to sample in the case of different number of freezing and thawing, obtains shearing strength, the internal friction angle of bulk materialWith cohesive strength c, the changing rule of the bulk material intensity under freeze thawing repeatedly is analyzed by data, important parameter is provided to study the stability of high altitudes and cold area metal Mine production side slope, the changing rule that different sizes match the mechanical property of lower bulk material can additionally be studied, and the mechanical characteristic of the bulk material of each gradation under axially different stress can accurately, be quickly and easily measured by test specimen control system and stress loading system, simulated experiment indoors, with easy to operate, experimental data is more accurate.
Description
Technical field
The invention belongs to the mechanical test technical field for bulk material of digging up mine, it is related to Rock And Soil granular media object under Freezing-Melting Condition
The staight scissors test device and its test method of material.
Background technique
In surface mining and underground mining activity, comprising during mine capital construction outdoor removing and excavation developing,
It dumps object and generally comprises rotten plant surface soil, weathered rock and soil, solid rock and mixing ground, also including sometimes can recoverable off-balancesheet
Mine, lean ore etc. need to transport to certain place and dump, this place is known as refuse dump.Refuse dump is a kind of huge artificial loose heap pad
Body, there are serious safety problems.Refuse dump unstability will lead to mine soil field disaster and Important Project accident, not only influence mine
The normal production on mountain, also will make mine suffer huge economic loss, so guaranteeing that the stability of refuse dump just seems to Guan Chong
It wants.Currently, the exploitation of China's metallic mineral resources is just gradually shifted to western high and cold, high altitude localities, west area is dry, warm
The big environment of difference necessarily will affect the stabilization of refuse dump, study the mechanical property of the refuse dump bulk material under freeze-thaw cycles
Variation provides important parameter to study the stabilization of refuse dump.
Therefore, it according to a set of cooling and heating circulation system on the basis of previous staight scissors instrument, is added, simulates high and cold, high
The temperature variations of Altitude Regions refuse dump develop the direct shearing test dress of a set of Rock And Soil bulk material under Freezing-Melting Condition
It sets, to study casting for after to obtain influence and the rule of development of the Freezing-Melting Condition to the mechanical property of granular media and its intensity
The instability Mechanism of field provides important parameter.
Summary of the invention
The purpose that the present invention is implemented is to propose a kind of direct shearing test device of Rock And Soil bulk material under Freezing-Melting Condition
And experimental method, it can make full use of the test specimen control system of the system, stress loading system, data collection system and cold and hot
Circulating temperature control system is realized the experiment detection to bulk material under different normal pressures and different number of freezing and thawing and record, is passed through
Analytical calculation obtains internal friction angle and cohesive strength under each stress state, and analytic intensity curve evolution changing rule.For reality
Existing above-mentioned purpose, the present invention adopts the following technical scheme:
The staight scissors test device of Rock And Soil bulk material under Freezing-Melting Condition, comprising:
Stress loading system, including the continuous loading system of vertical direction, the continuous loading system of horizontal direction；
Test specimen control system, upper shear box, lower shear box including pedestal and loading sample, upper shear box, lower shear box
It is oppositely arranged composition shear box up and down；It is connected between upper shear box, lower shear box with steel ball, it is lower that steel ball is used between shear box and substrate
Connection；It loads piston plate to be located above upper shear box, and there are spacing between the two；It further include the axial direction pressure that top is set
Power steel plate, axial compressive force steel plate are fixed on above pedestal by optical axis bar, and there is nut check at optical axis bar both ends；Two sides of base point
It is not fixed with lateral pressure steel plate；The continuous loading system of vertical direction is fixed on axial compressive force lower surface of steel plate；Horizontal direction connects
Continuous loading system is fixed on lateral pressure steel plate；
Cold and hot temperature control circulation system, including removable insulation cover, cold cycling liquid pipeline, high-power cryostat circulator；It can
Dismounting insulation cover is mounted on shear box, outside lower shear box；Removable insulation cover by cold cycling liquid pipeline with it is high-power
The connection of cryostat circulator；
Data collection system, vertical direction pressure sensor, horizontal direction pressure sensor including acquiring pressure signal,
Acquire vertical displacement sensor, the horizontal displacement sensors of displacement signal, temperature element, temperature inductor；The vertical side
It is installed in the continuous loading system of vertical direction to pressure sensor, vertical displacement sensor；Horizontal direction pressure sensor,
Horizontal displacement sensors are installed in the continuous loading system of horizontal direction；Temperature element is mounted on removable insulation cover；Temperature
Degree inductor is mounted in lower shear box；The vertical direction pressure sensor, horizontal direction pressure sensor, vertical displacement
Sensor, horizontal displacement sensors, temperature element, temperature inductor are connect with dataphone respectively.
The staight scissors test method of the invention proposes a kind of under Freezing-Melting Condition Rock And Soil bulk material, using above-mentioned test
Device comprising following work step:
(1) experiment sample used is placed in shear box, covers removable insulation cover, open high-power cryostat circulation
Machine, carries out freeze thawing treatment, and experimental selection reaches and wants in 15 DEG C of thawing 6h as a Frozen-thawed cycled period in -20 DEG C of frost 6h
Direct shearing test is carried out after the number of freezing and thawing asked；
(2) apply certain direct stress to upper shear box by loading piston plate using the continuous loading system of vertical direction,
The continuous loading system of horizontal direction provides the shearing force of horizontal direction with certain shear rate 1.4mm/min, works as coupon level
When deformation reaches the 15%~20% of specimen size, it is believed that sample has destroyed；
(3) it is hung down using what test specimen in vertical direction pressure sensor and horizontal direction pressure sensor record shear box was subject to
Vertical compression power and horizontal pressure force are generated during loading using vertical displacement sensor and horizontal displacement sensors record test specimen
Axial displacement and lateral displacement, and be transferred on computer, record the variation of whole process shearing force and displacement, and according to data come
It is fitted a stress-displacement curve；
(4) new sample is put into again in shear box, covers removable insulation cover, opens high-power cryostat circulator,
After undergoing identical number of freezing and thawing, by changing direct stress size, above-mentioned direct shearing test is repeated；
(5) after multiple groups are tested, data is arranged, the internal friction angle of sample is calculatedWith cohesive strength c.
Compared with the direct shearing test device of existing granular media, the present invention has the advantage that
The staight scissors test device and its test method of Rock And Soil bulk material, test specimen under Freezing-Melting Condition provided by the invention
Control system, stress loading system, cold and hot temperature control circulation system, the mutual close fit between data collection system, by right
The direct shearing test analysis of sample, obtains shearing strength, the internal friction angle of bulk material in the case of different number of freezing and thawingAnd adhesive aggregation
Power c analyzes the changing rule of the bulk material intensity under freeze thawing repeatedly by data, to study high altitudes and cold area Gold
The stability for belonging to Mine production side slope provides important parameter, can additionally study different sizes and match lower bulk material
The changing rule of mechanical property, and can accurately, quickly and easily be measured not by test specimen control system and stress loading system
The mechanical characteristic of the bulk material of each gradation under coaxial stress, is not necessarily to field measurement, and simulated experiment indoors has
It is easy to operate, it does not influence to produce, high degree of automation, safe and efficient advantage.On the other hand the system principle is simple, operation compared with
For convenience, experimental data is more accurate.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is the schematic diagram of internal structure of shear box of the invention；
Fig. 3 is shear box top view of the invention；
Fig. 4 is shear box sectional view of the invention；
Fig. 5 is substrate top view of the invention；
Fig. 6 is lateral pressure steel plate side view of the invention.
Specific embodiment
The specific technical solution of the present invention is described with reference to the drawings.
As shown in Figure 1, under Freezing-Melting Condition Rock And Soil bulk material staight scissors test device, comprising:
Stress loading system, including the continuous loading system 2 of vertical direction, the continuous loading system 6 of horizontal direction；
Test specimen control system, upper shear box 4, lower shear box 7 including pedestal 14 and loading sample, such as Fig. 2 and Fig. 3 institute
Show, upper shear box 4, about 7 lower shear box are oppositely arranged composition shear box；Connected between upper shear box 4, lower shear box 7 with steel ball 9
It connects, as shown in figure 5, being connected between lower shear box 7 and substrate 14 with steel ball 9；It loads piston plate 15 and is located at upper 4 top of shear box, and
And there are spacing between the two；It further include the axial compressive force steel plate 12 that top is set, axial compressive force steel plate 12 passes through optical axis bar
10 are fixed on 14 top of pedestal, and there is the locking of nut 11 at 10 both ends of optical axis bar；14 two sides of pedestal are respectively fixed with lateral pressure steel
Plate 13；The continuous loading system 2 of vertical direction is fixed on 12 lower surface of axial compressive force steel plate；The continuous loading system 6 of horizontal direction is solid
It is scheduled on lateral pressure steel plate 13；
Cold and hot temperature control circulation system, including removable insulation cover 17, cold cycling liquid pipeline 20, high-power cryostat circulator
19；Removable insulation cover 17 is mounted on shear box 4, outside lower shear box 7；Removable insulation cover 17 passes through cold cycling liquid pipe
Road 20 is connect with high-power cryostat circulator 19；
Data collection system, vertical direction pressure sensor 1, horizontal direction pressure sensor including acquiring pressure signal
5, acquire vertical displacement sensor 3, the horizontal displacement sensors 8 of displacement signal, temperature element 16, temperature inductor 21；It is described
Vertical direction pressure sensor 1, vertical displacement sensor 3 is installed in the continuous loading system 2 of vertical direction；Horizontal direction
Pressure sensor 5, horizontal displacement sensors 8 are installed in the continuous loading system 6 of horizontal direction；Temperature element 16 is mounted on can
It dismounts on insulation cover 17；Temperature inductor 21 is mounted in lower shear box 7；The vertical direction pressure sensor 1, level side
To pressure sensor 5, vertical displacement sensor 3, horizontal displacement sensors 8, temperature element 16, temperature inductor 21 respectively with electricity
18 communication connection of brain.
Axial compressive force steel plate 12, lateral pressure steel plate 13 and the pedestal 14 is rigid metallic material, 14 He of pedestal
Two lateral pressure steel plates 13 are connected by welding manner, are all made of Q235C model steel, size Corresponding matching, axial compressive force
The specification of steel plate 12 is 10mm × 1000mm × 800mm (thickness * length * width), as shown in fig. 6, lateral pressure steel plate 13 is advised
Lattice are 800mm × 10mm × 600mm (length * thickness * height) matching, and substrate uses specification for 1000mm × 800mm × 10mm
(length * width * thickness) is all satisfied the requirement of intensity and deflection needed for experiment.
The lateral pressure steelframe 13 can fix the position of horizontal direction pressure sensor 5 with a groove and six
Nut, the position of horizontal addload system and device 6 can be adjusted up and down, to adapt to various sizes of shear box in experiment,
It answers bring to influence under size to eliminate, makes uniform force on box face, to guarantee to test more accurate, reliable sheet, experimental provision
It can satisfy the requirement of experiment that specimen size is 100mm-800mm.
Upper shear box 4, lower shear box 7 form shear box, and shear box is rigid material, with a thickness of 10mm, meet intensity and
Deflection requirement has transmitting temperature capability well, test specimen is enable to obtain low-temperature treatment as early as possible.Shear box is set by special
Meter, there are four temperature inductors 21 for different location inside it, and the temperature of real-time monitoring style is carried out by fiber optic conduction data.
It is connected between upper shear box 4, lower shear box 7 with steel ball 9, is connected between lower shear box 7 and substrate 14 with steel ball 9, can reduced between box
Frictional force, keep experimental data more accurate.Axial loading device applies a vertical side to sample by load piston plate 15
To power, load piston plate 15 has the dimensions with upper shear box 4 and match, and spacing between the two is 5mm, avoids and loads work
The accuracy of friction effects experiment between seben 15 and shear box.
Removable insulation cover 17 has good thermal insulation property, can completely cut off the heat exchange with the external world well, have on it
A temperature element 16, can detect the temperature change in shear box, accordingly can according to require adjustment temperature.
High-power cryostat circulator 19, controllable temperature range be -60 DEG C~150 DEG C, by with removable heat preservation
Heavy connection of pipe in cover 17 is connected, to the high and low Temperature Treatment of carry out of sample in shear box.Pipe in removable insulation cover 17
Road Multi-layered wound on removable 17 wall of insulation cover, thus realize farthest transmit temperature, enable test specimen promptly into
Row freeze thawing treatment.
It stretches by oil pressure cntrol for the continuous loading system 2 of vertical direction and the continuous loading system 6 of horizontal direction, belongs to rigidity
Material.It is all made of using model DYG15016 type electrichydraulic control hydraulic jack, can be realized automatic, continuous load, it is maximum
Load is 1500KN, range 160mm, and vertically and horizontally Pressure Sensor Precision ± 0.3%F.S, institute
Its range of vertical displacement sensor 3 stated is in 0-100mm, precision ± 0.1%F.S；Its range of horizontal displacement sensors 8 is in 0-
120mm, precision ± 0.1%F.S；For its range of temperature inductor 21 at -40 DEG C~100 DEG C, precision is all satisfied reality ± 0.1%
Test requirement.
The optical axis bar 10 is threaded, high-intensitive rigid rod, and attaching nut 11 fixes isolation board up and down, when necessary
Height adjustment can be carried out to axial compressive force component steel plate 12, to adapt to various sizes of shear box.
The staight scissors test device of Rock And Soil bulk material under the Freezing-Melting Condition, according to Coulomb's lawIt can pass through
Test specimen control system and stress loading system accurately, conveniently, efficiently, are quickly measured in the test specimen after different number of freezing and thawing
Failure by shear intensity, and by can be calculated corresponding internal friction angleWith cohesive strength c, it is not necessarily to field measurement, indoors
Simulated experiment, have it is easy to operate, do not influence to produce, high degree of automation, safe, accurate, efficient advantage.
The staight scissors test method of the invention proposes a kind of under Freezing-Melting Condition Rock And Soil bulk material, using above-mentioned test
Device comprising following work step:
A, pedestal 14 is closely connect by welding manner with lateral pressure steelframe 13, then with axial compressive force component steel plate 12
It is fixed with screwed 10 attaching nut 11 of optical axis bar and is assembled into loading experiment platform body frame, then fixed horizontal direction and erect
Histogram to pressure sensor and loading device, place shear box and displacement sensor, finally load onto that insulation cover connection is cold and hot to follow
Ring machine forms complete experimental bench.
B, experiment sample used is placed in shear box, covers removable insulation cover 17, open high-power cryostat circulation
Machine 19, carries out freeze thawing treatment, and experimental selection reaches in -20 DEG C of frost 6h in 15 DEG C of thawing 6h as a Frozen-thawed cycled period
It is required that number of freezing and thawing after carry out direct shearing test；
C, upper shear box 4 is applied by load piston plate 15 using the continuous loading system 2 of vertical direction and certain is just answered
Power, the continuous loading system 6 of horizontal direction provide the shearing force of horizontal direction with certain shear rate 1.4mm/min, work as test specimen
When horizontal distortion reaches the 15%~20% of specimen size, it is believed that sample has destroyed；
C, record what test specimen in shear box was subject to using vertical direction pressure sensor 1 and horizontal direction pressure sensor 5
Pressure at right angle and horizontal pressure force record test specimen using vertical displacement sensor 3 and horizontal displacement sensors 8 and produce during loading
Raw axial displacement and lateral displacement, and be transferred on computer 18, the variation of record whole process shearing force and displacement, and according to
Data are fitted a stress-displacement curve；
D, new sample is put into again in shear box, covers removable insulation cover 17, opens high-power cryostat circulator
19, after undergoing identical number of freezing and thawing, by changing direct stress size, repeat above-mentioned direct shearing test；
E, after multiple groups are tested, data is arranged, the internal friction angle of sample is calculatedWith cohesive strength c.
Claims (4)
1. the staight scissors test device of Rock And Soil bulk material under Freezing-Melting Condition characterized by comprising
Stress loading system, including the continuous loading system of vertical direction (2), the continuous loading system of horizontal direction (6)；
Test specimen control system, the shear box including pedestal (14) and loading sample；Shear box prevents on pedestal (14)；Load is lived
Seben (15) is located above shear box, and there are spacing between the two；It further include the axial compressive force steel plate that top is set
(12), axial compressive force steel plate (12) is fixed on above pedestal (14) by optical axis bar (10), and there is nut at optical axis bar (10) both ends
(11) it locks；Pedestal (14) two sides are respectively fixed with lateral pressure steel plate (13)；The continuous loading system of vertical direction (2) is fixed on
Axial compressive force steel plate (12) lower surface；The continuous loading system of horizontal direction (6) is fixed on lateral pressure steel plate (13)；
Cold and hot temperature control circulation system, including removable insulation cover (17), cold cycling liquid pipeline (20), high-power cryostat circulator
(19)；It is external that removable insulation cover (17) is mounted on shear box (4), lower shear box (7)；Removable insulation cover (17) passes through cold
Hot circulating solution pipeline (20) is connect with high-power cryostat circulator (19)；
Data collection system is acquired temperature in the pressure of sample application, the displacement of sample, shear box.
2. the staight scissors test device of Rock And Soil bulk material under Freezing-Melting Condition according to claim 1, which is characterized in that institute
The shear box stated includes upper shear box (4), lower shear box (7), is connected between upper shear box (4), lower shear box (7) with steel ball (9)
It connects, lower shear box (7) is connect between substrate (14) with steel ball (9).
3. the staight scissors test device of Rock And Soil bulk material under Freezing-Melting Condition according to claim 1, which is characterized in that institute
The data collection system stated, vertical direction pressure sensor (1), horizontal direction pressure sensor including acquiring pressure signal
(5), vertical displacement sensor (3), the horizontal displacement sensors (8) of displacement signal, temperature element (16), temperature inductor are acquired
(21)；The vertical direction pressure sensor (1), vertical displacement sensor (3) are installed in vertical direction and continuously load and be
It unites on (2)；Horizontal direction pressure sensor (5), horizontal displacement sensors (8) are installed in the continuous loading system of horizontal direction
(6) on；Temperature element (16) is mounted on removable insulation cover (17)；Temperature inductor (21) is mounted in lower shear box (7)；
The vertical direction pressure sensor (1), horizontal direction pressure sensor (5), vertical displacement sensor (3), horizontal displacement
Sensor (8), temperature element (16), temperature inductor (21) respectively with computer (18) communication connection.
4. the test method of the staight scissors test device of Rock And Soil bulk material under Freezing-Melting Condition according to claim 1, packet
Include following steps:
(1) experiment sample used is placed in shear box, covers removable insulation cover (17), opens high-power cryostat circulator
(19), freeze thawing treatment is carried out, experimental selection reaches in -20 DEG C of frost 6h in 15 DEG C of thawing 6h as a Frozen-thawed cycled period
It is required that number of freezing and thawing after carry out direct shearing test；
(2) upper shear box (4) are applied centainly just by load piston plate (15) using the continuous loading system of vertical direction (2)
Stress, the continuous loading system of horizontal direction (6) provide the shearing force of horizontal direction with certain shear rate 1.4mm/min, when
When coupon level deformation reaches the 15%~20% of specimen size, it is believed that sample has destroyed；
(3) pressure at right angle and horizontal pressure force that test specimen is subject in shear box are recorded respectively using pressure sensor, is passed using displacement
The axial displacement and lateral displacement that sensor record test specimen generates during loading, record the change of whole process shearing force and displacement
Change, and is fitted a stress-displacement curve according to data；
(4) new sample is put into again in shear box, covers removable insulation cover (17), opens high-power cryostat circulator
(19), after undergoing identical number of freezing and thawing, by changing direct stress size, above-mentioned direct shearing test is repeated；
(5) after multiple groups are tested, data is arranged, the internal friction angle of sample is calculatedWith cohesive strength c.
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| CN201910369929.4A CN109991104A (en) | 2019-05-06 | 2019-05-06 | The staight scissors test device and its test method of Rock And Soil bulk material under Freezing-Melting Condition |
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| CN112730136A (en) * | 2020-12-24 | 2021-04-30 | 黄河勘测规划设计研究院有限公司 | Freezing-thawing deformation indoor test system for dam slope of silt dam under freezing-thawing circulation effect |
| CN112857939A (en) * | 2021-02-09 | 2021-05-28 | 防灾科技学院 | Walk and slide fracture physical simulation device |
| CN112903465A (en) * | 2021-02-04 | 2021-06-04 | 太原理工大学 | Device and method for testing double bearing capacity of single-row group columns in inclined goaf |
| CN113109172A (en) * | 2021-03-26 | 2021-07-13 | 中山大学 | Torsional shear test device for freezing and thawing soil body |
| CN113588447A (en) * | 2021-08-20 | 2021-11-02 | 中国科学院西北生态环境资源研究院 | Frozen soil large shear apparatus and system thereof |
| CN113702151A (en) * | 2021-07-14 | 2021-11-26 | 长沙理工大学 | Remove portable automatic shear apparatus |
| CN114428024A (en) * | 2021-12-03 | 2022-05-03 | 兰州交通大学 | Shear apparatus for freeze-thaw cycle shear test and test method |
| CN115950734A (en) * | 2023-02-09 | 2023-04-11 | 黑龙江省水利科学研究院 | Clamp for testing anchoring force of expansion bolt under freeze-thaw cycle condition and testing method |
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| CN111060411A (en) * | 2019-12-27 | 2020-04-24 | 中国矿业大学 | Intelligent rock mass creep shear testing machine and testing method |
| CN112730136A (en) * | 2020-12-24 | 2021-04-30 | 黄河勘测规划设计研究院有限公司 | Freezing-thawing deformation indoor test system for dam slope of silt dam under freezing-thawing circulation effect |
| CN112730136B (en) * | 2020-12-24 | 2023-08-18 | 黄河勘测规划设计研究院有限公司 | Freezing-thawing deformation indoor test system for dam slope of silt land dam under freezing-thawing circulation effect |
| CN112903465B (en) * | 2021-02-04 | 2022-06-14 | 太原理工大学 | Device and method for testing double bearing capacity of single-row group columns in inclined goaf |
| CN112903465A (en) * | 2021-02-04 | 2021-06-04 | 太原理工大学 | Device and method for testing double bearing capacity of single-row group columns in inclined goaf |
| CN112857939A (en) * | 2021-02-09 | 2021-05-28 | 防灾科技学院 | Walk and slide fracture physical simulation device |
| CN113109172A (en) * | 2021-03-26 | 2021-07-13 | 中山大学 | Torsional shear test device for freezing and thawing soil body |
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| CN115950734A (en) * | 2023-02-09 | 2023-04-11 | 黑龙江省水利科学研究院 | Clamp for testing anchoring force of expansion bolt under freeze-thaw cycle condition and testing method |
| CN115950734B (en) * | 2023-02-09 | 2023-09-15 | 黑龙江省水利科学研究院 | Clamp for testing anchoring force of expansion bolt under freezing and thawing cycle condition and testing method |
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