CN105547864A - Method for determining shear strength of chemically polluted soil and special full-automatic direct shear apparatus - Google Patents
Method for determining shear strength of chemically polluted soil and special full-automatic direct shear apparatus Download PDFInfo
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- CN105547864A CN105547864A CN201610044788.5A CN201610044788A CN105547864A CN 105547864 A CN105547864 A CN 105547864A CN 201610044788 A CN201610044788 A CN 201610044788A CN 105547864 A CN105547864 A CN 105547864A
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- 239000002689 soil Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 34
- 230000007797 corrosion Effects 0.000 claims abstract description 33
- 238000005260 corrosion Methods 0.000 claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 238000012423 maintenance Methods 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims description 30
- 239000004575 stone Substances 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000003556 assay Methods 0.000 claims description 5
- 238000011109 contamination Methods 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229940099259 vaseline Drugs 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 abstract description 3
- 238000001764 infiltration Methods 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 abstract description 2
- 238000011065 in-situ storage Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/30—Staining; Impregnating ; Fixation; Dehydration; Multistep processes for preparing samples of tissue, cell or nucleic acid material and the like for analysis
Abstract
The invention discloses a method for determining the shear strength of chemically polluted soil and a special full-automatic direct shear apparatus. A chemical corrosion device is added for the direct shear apparatus compared with the prior art, infiltration holes are formed in the bottom of a shear box, and a notch groove is formed in the bottom of a container trough of the chemical corrosion device, so that when the method is adopted for determining, a chemical corrosion solution can be directly injected into the container trough to perform sealed maintenance; after maintenance is completed, vertical pressure loading is directly performed to complete a full-automatic direct shear test so that the pollutant corrosion situation of a soil body on site can be simulated, destroying-free maintenance of a tested soil sample is achieved, the influence of stress release in the sampling process is avoided, disturbance suffered by the soil body is reduced as far as possible, and the tested sample can be closer to the in-situ soil sample in property. In addition, due to the fact that the infiltration rate fluctuation of the chemical corrosion solution is smaller, a result is closer to the polluted situation of natural soil, corrosion distribution can be relatively uniform, the influence of local corrosion on the mechanical property determination of the soil sample is avoided, and the problem that a conventional direct shear apparatus cannot detect the shear strength and parameters of the chemically polluted soil is solved.
Description
Technical field
The invention belongs to civil engineering work instrument test field, be specifically related to a kind of assay method and dedicated full-automatic direct shear apparatus of chemical contamination shear strength of soil.
Background technology
The foundation soil of most industry plant area is all subject to chemical pollutant erosion damage in various degree, causes soil strength decay, depression of bearing force, and then causes the distortion of superstructure structure non-uniform settling, unstable failure.For the singularity of industrial working foundation soil boundary environment, need to consider the corrosion of chemical solution in foundation soil Design of Bearing Capacity process, this to rationally definitely base soil layer load-bearing capacity and intensive parameter most important.
At present, for determining foundation soil bearing capacity, mostly adopt traditional direct shear apparatus to carry out direct shear test to soil layer both at home and abroad, these boxshear apparatus mainly comprise shear box, vertical and horizontal loading apparatus, measurement and control device etc.And in recent years, the soil body is affected by the external environment increasing, traditional direct shear apparatus can not the basic parameter of the Obtaining Accurate soil body." although the large-scale frozen soil direct shear test instrument of a kind of Full automatic digital " (CN102313673B), " frozen soil-structure direct shear apparatus and using method thereof " (CN102252919B), " temperature control type direct shearing equipment " (CN102230868B) and " multifunctional frozen-structure interface circulation direct shear apparatus and experimental working technique " (CN102798575B) etc. have improved traditional direct shear apparatus, to adapt to the staight scissors test of Structural Soils under complex environment, but, these devices only to address only under cold conditions the problems such as complicated soil body shear test is difficult in civil engineering and traffic engineering design, existing geotechnological direct shear apparatus still cannot meet soil body sample staight scissors test request under chemical solution and load coupling, use the assay method of above-mentioned direct shear apparatus that measurement result will inevitably be made to produce relatively large deviation.This is because, on the one hand, what existing geotechnological direct shear apparatus measured usually is, the shearing strength of sample under certain load action after chemical solution corrosion, chemical solution and load cannot be realized to the synchronism of sample generation effect, therefore, have greater difference compared with parameter required in Practical Project, directive significance is limited; On the other hand, in process of the test, conventional sample production method, be difficult to avoid producing disturbance to soil sample, make the character of test soil sample and original position soil sample occur difference, measuring the mechanical property of soil sample has considerable influence, and the parameter of mensuration also can be made to produce deviation.
Summary of the invention
A technical matters to be solved by this invention is to provide a kind of assay method of chemical contamination shear strength of soil of simple and direct reliable, high, the durable practicality of accuracy of measurement, under realizing chemical solution and load coupling, the straightway testing of the shearing strength of soil body sample.
Another technical matters to be solved by this invention is to provide a kind of dedicated full-automatic direct shear apparatus for said determination method.
In order to solve above-mentioned first technical matters, the technical solution used in the present invention comprises the following steps:
A, after the medial surface of down cut box and upper shear box smears vaseline, down cut box bottom centre position being provided with seepage hole be placed in be provided with cutting container slot bottom, and the port of cutting is positioned at outside shear box, more successively lower permeable stone is placed in and lays filter paper in down cut box, on lower permeable stone and upper shear box is placed on down cut box;
B, produce sample to be tested with shear box with the cutting ring of interface dimensions, the sample of band cutting ring is placed on upper shear box, with stripper, sample is pressed in shear box, makes to contact with the filter paper on lower permeable stone is seamless bottom sample; Lay filter paper at sample top, upper dankness stone placed by filter paper, upper dankness stone places piston plate;
C, in container slot, inject chemical corrosion liquid, liquid level is not higher than displacement transmission lever bottom, covered container lid is also fixing, chemical corrosion liquid through cutting water conservancy diversion to entering seepage hole, and through enter seepage hole, lower permeable stone and on filter paper penetrate into sample until sample is completely soaked, immersion maintenance is carried out to sample;
D, after maintenance completes, by posting bar through the hole in container cover, adjust posting plate, load cylinder, pressure transducer and crossbeam, make posting bar distinguish close contact with posting plate, posting plate and load cylinder, load cylinder and crossbeam; Pressure transducer is contacted with container cover with posting plate;
E, startup air compressor, regulate pressure regulator valve to make pressure transducer reach to predetermined pressure at right angle;
F, regulations speed controller, start servomotor, and horizontal propeller drives pushing ram to promote container slot, and the movement of container slot promotes again down cut box and moves, writing time, pressure and shear displacemant in process of the test, calculates the shear parameters of sample.
For solving above-mentioned second technical matters, full-automatic direct shear apparatus designed by the present invention, comprise horizontal cushion cap, be arranged on the horizontal loading apparatus on horizontal cushion cap, vertical loading device and measurement and control device, shear box, its special feature is: this full-automatic direct shear apparatus also comprises chemical corrosion device; Described chemical corrosion device comprises container slot and container cover, and described container slot is slidably connected on horizontal cushion cap, and bottom is provided with cutting;
Described shear box comprises down cut box, upper shear box, is arranged on the lower permeable stone in down cut box and is arranged on upper dankness stone in shear box, the bottom centre of described down cut box is provided with into seepage hole, described shear box is arranged in described container slot, described cutting with described enter seepage hole be communicated with, and the port of cutting is positioned at outside shear box, for loading sample between described upper dankness stone and lower permeable stone;
The pushing ram of described horizontal loading apparatus is connected to the side of container slot, and the displacement transmission lever of described horizontal loading apparatus is connected with described upper shear box through the opposite side of described container slot; The posting bar of described vertical loading device is connected with the piston plate of vertical loading device through container cover, and pressure transducer is arranged between posting plate and container cover.
Preferably, described container slot and container cover are fixed by pin.
Preferably, described container slot adopts corrosion resistant metal or china clay material to make.
Preferably, described measurement and control device comprises recording controller and the first collector be connected with recording controller respectively, the second collector and the 3rd collector, described first collector is also connected with the load cylinder of vertical loading device by data line, described second collector is also connected by the pressure transducer of data line with vertical loading device, and described 3rd collector is also connected by the displacement transducer of data line with vertical loading device.
The present invention, on conventional direct shear test instrument, is provided with chemical corrosion device, and bottom shear box, is provided with seepage hole and is provided with cutting bottom container slot, like this, when producing soil sample, soil sample can be put into shear box, by injecting chemical corrosion liquid to container slot, carry out sealed maintenance; After maintenance terminates, directly carry out vertical pressure loading, complete full-automatic direct shear test.Therefore, the present invention has following beneficial effect:
1), when measuring, avoid the impact of stress relief in sampling process, reduce the disturbance that the soil body is subject to as far as possible, make sample closer to original position soil sample character;
2) fluctuation of chemical corrosion liquid infiltration rate is less, closer to the contaminated situation of natural soils, corrosion is distributed relatively uniform, avoids the impact that local corrosion measures soil sample mechanical property.
Accompanying drawing explanation
Fig. 1 is the sectional structure schematic diagram of full-automatic direct shear apparatus of the present invention.
Fig. 2 is shear box sectional structure enlarged drawing of the present invention.
Fig. 3 is shear box of the present invention and groove structure enlarged drawing (overlooking).
In figure: 1, rate controller, 2, horizontal propeller, 3, servomotor, 4, horizontal cushion cap, 5, air compressor, 6, crossbeam, 7, enter seepage hole, 8, pushing ram, 9, horizontal spherical guide, 10, ball, 11, container slot, 12, container cover, 13, pin, 14, down cut box, shear box on 15, 16, piston plate, 17, cutting, 18, lower permeable stone, 19, sample, 20, upper dankness stone, 21, posting plate, 22, load cylinder, 23, posting bar, 24, pressure transducer, 25, displacement transmission lever, 26, displacement transducer, 27, pressure regulator valve, 28, first data line, 29, second data line, 30, 3rd data line, 31, first collector, 32, second collector, 33, 3rd collector, 34, recording controller
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
As shown in Figure 1 and Figure 2, full-automatic direct shear apparatus of the present invention, on the basis of conventional direct shear test instrument, adds a chemical corrosion device.Namely full-automatic direct shear apparatus of the present invention comprises horizontal cushion cap 4, is arranged on the horizontal loading apparatus on horizontal cushion cap 4, vertical loading device and measurement and control device, shear box, and chemical corrosion device.This chemical corrosion device is made up of container slot 11 and container cover 12, container slot is slidably connected on horizontal cushion cap 4 by horizontal spherical guide 9 and ball 10, bottom is provided with cutting 17, the bottom centre of down cut box 14 is provided with into seepage hole 7, to be arranged in container slot 11, cutting 17 with enter seepage hole 7 and be communicated with, and the port of cutting 17 is positioned at outside down cut box 14; Wherein cutting 14 can for enter one or more cutting that seepage hole is symcenter (be symmetrical cutting), also can be both asymmetric many cuttings in this embodiment.The pushing ram 8 of the horizontal loading apparatus of full-automatic direct shear apparatus is connected to the left side of this container slot 11, displacement transmission lever 26 is connected with upper shear box 15 through the right side of this container slot 11, the posting bar 23 of full-automatic direct shear apparatus vertical loading device is connected with piston plate 16 through container cover 12, and pressure transducer 24 is arranged between posting plate 21 and container cover 12.Overflow for preventing the objectionable constituent in chemical corrosion liquid better, in test process, the most handy container cover 12 of container slot 11 seals, the form of sealing both can be fixed by this embodiment pin 13, also can adopt thread forms, packing washer form or other seal form known.By avoiding container slot 11 to be corroded by chemical solution, the permanance of Enhancement test instrument and practical popularity, preferential corrosion resistant metal or the china clay material of adopting is made.
Measurement and control device can adopt the data collecting instruments such as existing Datataker, but conveniently, accuracy, also can adopt the measurement and control device be jointly made up of recording controller 34 and the first collector 31, second collector 32 be all connected with recording controller 34 and the 3rd collector 33.Wherein, first collector 31 is also connected with the load cylinder 22 of vertical loading device by the first data line 28, second collector 32 is also connected with the pressure transducer 24 of vertical loading device by the second data line 29, and the 3rd collector 33 is also connected with the displacement transducer 27 of vertical loading device by the 3rd data line 30.
The present invention is when using above-mentioned full-automatic direct shear apparatus to measure the mensuration of chemical contamination shear strength of soil, and step is as follows:
A, after the medial surface of down cut box 14 and upper shear box 15 smears vaseline, down cut box 14 is placed in the bottom of container slot 11, and the port of cutting 17 is positioned at outside shear box, more successively lower permeable stone 18 is placed in down cut box 14, lower permeable stone 18 is laid filter paper and upper shear box 15 is placed on down cut box 14;
B, produce sample to be tested 19 with shear box with the cutting ring of interface dimensions, the sample 19 of band cutting ring is placed on upper shear box 15, with stripper, sample 19 is pressed in shear box, makes to contact with the filter paper on lower permeable stone 18 is seamless bottom sample 19; Lay filter paper at sample 19 top, filter paper is placed upper dankness stone 20, upper dankness stone 20 is placed piston plate 16;
C, in container slot 11, inject chemical corrosion liquid, liquid level is not higher than the bottom of displacement transmission lever 26, covered container lid 12 is also fixing, chemical corrosion liquid through cutting 17 water conservancy diversion to entering seepage hole 7, and through enter seepage hole 7, lower permeable stone 18 and on filter paper penetrate into sample 19 until sample 19 is completely soaked, immersion maintenance is carried out to sample 19;
D, after maintenance completes, by posting bar 23 through the hole in container cover 12, adjust posting plate 21, load cylinder 22, pressure transducer 24 and crossbeam 6, make posting bar 23 and posting plate 21, posting plate 21 and load cylinder 22, load cylinder 22 and crossbeam 6 close contact respectively; Pressure transducer 24 is contacted with container cover 12 with posting plate 21;
E, startup air compressor 5, regulate pressure regulator valve 29 to make pressure transducer 24 reach to predetermined pressure at right angle;
F, regulations speed controller 1, start servomotor 3, under the effect of horizontal propeller 2, pushing ram 8 promotes container slot 11, the movement of container slot 11 promotes again down cut box 14 and moves, writing time, pressure and shear displacemant in process of the test, calculates the shear parameters of sample.
The present invention is owing to having into seepage hole 7 and cutting 17 in shear box bottom design, and the port of cutting 17 directly communicates with container slot 11, make chemical corrosion liquid in the test maintenance stage slowly infiltrate the soil body, slow down the diffusion of chemical corrosion liquid in soil sample, make corrosion more even.Carry out the direct shear test stage, the present invention adopts full-automatic measurement and control device, optimizes traditional manual read's logarithmic data acquisition method, makes experimental test result have higher accuracy.
Claims (6)
1. an assay method for chemical contamination shear strength of soil, is characterized in that: the method comprises the following steps:
A. after down cut box and the medial surface of upper shear box smear vaseline, down cut box bottom centre position being provided with seepage hole be placed in be provided with cutting container slot bottom, and the port of cutting is positioned at outside shear box, more successively lower permeable stone is placed in and lays filter paper in down cut box, on lower permeable stone and upper shear box is placed on down cut box;
B. produce sample to be tested with shear box with the cutting ring of interface dimensions, the sample of band cutting ring is placed on upper shear box, with stripper, sample is pressed in shear box, makes to contact with the filter paper on lower permeable stone is seamless bottom sample; Lay filter paper at sample top, upper dankness stone placed by filter paper, upper dankness stone places piston plate;
C. in container slot, inject chemical corrosion liquid, liquid level is not higher than displacement transmission lever bottom, and covered container lid is also fixing, carries out immersion maintenance to sample;
D. after maintenance completes, by posting bar through the hole in container cover, adjust posting plate, load cylinder, pressure transducer and crossbeam, make posting bar and posting plate, posting plate and load cylinder, load cylinder and crossbeam close contact respectively; Pressure transducer is contacted with container cover with posting plate;
E. start air compressor, regulate pressure regulator valve to make pressure transducer reach to predetermined pressure at right angle;
F. regulations speed controller, starts servomotor, and pushing ram promotes container slot, and the movement of container slot promotes again down cut box and moves, writing time, pressure and shear displacemant in process of the test, calculates the shear parameters of sample.
2. the full-automatic direct shear apparatus for method described in claim 1, comprise horizontal cushion cap, be arranged on the horizontal loading apparatus on horizontal cushion cap, vertical loading device and measurement and control device, shear box, is characterized in that: this full-automatic direct shear apparatus also comprises chemical corrosion device;
Described chemical corrosion device comprises container slot and container cover, and described container slot is slidably connected on horizontal cushion cap, and bottom is provided with cutting;
Described shear box comprises down cut box, upper shear box, is arranged on the lower permeable stone in down cut box and is arranged on upper dankness stone in shear box, the bottom centre of described down cut box is provided with into seepage hole, described shear box is arranged in described container slot, described cutting with described enter seepage hole be communicated with, and the port of cutting is positioned at outside shear box, for loading sample between described upper dankness stone and lower permeable stone;
The pushing ram of described horizontal loading apparatus is connected to the side of container slot, and the displacement transmission lever of described horizontal loading apparatus is connected with described upper shear box through the opposite side of described container slot; The posting bar of described vertical loading device is connected with the piston plate of vertical loading device through container cover, and pressure transducer is arranged between posting plate and container cover.
3. full-automatic direct shear apparatus according to claim 2, is characterized in that: described container slot and container cover are fixed by pin.
4. the full-automatic direct shear apparatus according to Claims 2 or 3, is characterized in that: described container slot adopts corrosion resistant metal or china clay material to make.
5. the full-automatic direct shear apparatus according to Claims 2 or 3, it is characterized in that: the first collector, the second collector and the 3rd collector that described measurement and control device comprises recording controller and is connected with recording controller, described first collector is also connected with the load cylinder of vertical loading device by data line, described second collector is also connected by the pressure transducer of data line with vertical loading device, and described 3rd collector is also connected by the displacement transducer of data line with vertical loading device.
6. full-automatic direct shear apparatus according to claim 4, it is characterized in that: described measurement and control device comprises recording controller and is arranged on the first collector, the second collector and the 3rd collector on recording controller, described first collector is connected with the load cylinder of vertical loading device by data line, described second collector is connected by the pressure transducer of data line with vertical loading device, and described 3rd collector is connected by the displacement transducer of data line with vertical loading device.
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| CN201610044788.5A CN105547864B (en) | 2016-01-22 | 2016-01-22 | The assay method and dedicated full-automatic direct shear apparatus of chemical contamination shear strength of soil |
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| CN201610044788.5A CN105547864B (en) | 2016-01-22 | 2016-01-22 | The assay method and dedicated full-automatic direct shear apparatus of chemical contamination shear strength of soil |
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| CN106248506A (en) * | 2016-09-27 | 2016-12-21 | 山东大学 | A kind of visualization direct shear apparatus device and method |
| CN106290005A (en) * | 2016-07-28 | 2017-01-04 | 上海市城市建设设计研究总院 | The strain direct shear apparatus such as the tetrad of air pressure-loading |
| CN107607413A (en) * | 2017-10-13 | 2018-01-19 | 清华大学 | A kind of rock shearing experimental rig |
| CN107843485A (en) * | 2017-12-19 | 2018-03-27 | 浙江工业大学 | A kind of temperature control shear box device and operating method for direct shearing test |
| CN107860647A (en) * | 2017-12-19 | 2018-03-30 | 浙江工业大学 | A kind of shear box device and operating method for constant cross-section direct shearing test |
| CN107917846A (en) * | 2017-11-01 | 2018-04-17 | 浙江大学 | Soil shear characteristic essence amount determining device and its assay method |
| CN108152151A (en) * | 2017-12-29 | 2018-06-12 | 西安长庆科技工程有限责任公司 | The unsaturated soil direct shear apparatus that a kind of Temperature Control Type is sheared repeatedly |
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| CN106290005A (en) * | 2016-07-28 | 2017-01-04 | 上海市城市建设设计研究总院 | The strain direct shear apparatus such as the tetrad of air pressure-loading |
| CN106248506A (en) * | 2016-09-27 | 2016-12-21 | 山东大学 | A kind of visualization direct shear apparatus device and method |
| CN107607413A (en) * | 2017-10-13 | 2018-01-19 | 清华大学 | A kind of rock shearing experimental rig |
| CN107917846A (en) * | 2017-11-01 | 2018-04-17 | 浙江大学 | Soil shear characteristic essence amount determining device and its assay method |
| CN107843485A (en) * | 2017-12-19 | 2018-03-27 | 浙江工业大学 | A kind of temperature control shear box device and operating method for direct shearing test |
| CN107860647A (en) * | 2017-12-19 | 2018-03-30 | 浙江工业大学 | A kind of shear box device and operating method for constant cross-section direct shearing test |
| CN108152151A (en) * | 2017-12-29 | 2018-06-12 | 西安长庆科技工程有限责任公司 | The unsaturated soil direct shear apparatus that a kind of Temperature Control Type is sheared repeatedly |
| CN108489782A (en) * | 2018-03-16 | 2018-09-04 | 郑州大学 | A kind of the direct shear test sample preparation device and its application method of infiltration type slip casting solidified earth |
| CN109709312A (en) * | 2018-12-10 | 2019-05-03 | 太原理工大学 | Wireless penetration controls concrete freeze thawing machine |
| CN109709312B (en) * | 2018-12-10 | 2022-06-17 | 太原理工大学 | Wireless control concrete freeze thawing machine |
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| CN109596401A (en) * | 2019-02-01 | 2019-04-09 | 合肥工业大学 | Mixing pile test specimen laboratory experiment curing means |
| CN110726821A (en) * | 2019-10-21 | 2020-01-24 | 南京林业大学 | Device for testing expansibility and shear strength of carbonized soil in carbonization process of magnesium oxide solidified soil |
| CN110726822A (en) * | 2019-10-21 | 2020-01-24 | 南京林业大学 | Method for testing expansibility and shear strength of carbonized soil in carbonization process of magnesium oxide solidified soil |
| CN110726822B (en) * | 2019-10-21 | 2021-11-23 | 南京林业大学 | Method for testing expansibility and shear strength of carbonized soil in carbonization process of magnesium oxide solidified soil |
| CN110726821B (en) * | 2019-10-21 | 2021-11-23 | 南京林业大学 | Device for testing expansibility and shear strength of carbonized soil in carbonization process of magnesium oxide solidified soil |
| CN110749514A (en) * | 2019-12-02 | 2020-02-04 | 吉林大学 | Measuring device and measuring method for shear modulus of brittle material |
| 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 |
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