CN113418768A - Combined die device and method for manufacturing conventional direct shear test sample of composite rock mass - Google Patents
Combined die device and method for manufacturing conventional direct shear test sample of composite rock mass Download PDFInfo
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- CN113418768A CN113418768A CN202110783624.5A CN202110783624A CN113418768A CN 113418768 A CN113418768 A CN 113418768A CN 202110783624 A CN202110783624 A CN 202110783624A CN 113418768 A CN113418768 A CN 113418768A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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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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Abstract
The invention relates to a combined die device for manufacturing a conventional direct shear test sample of a composite rock mass and a manufacturing method thereof. The combined die device enriches the manufacturing convenience of composite samples with different cementing surfaces, and avoids the damage to the samples and the uncertainty of interface distribution requirements caused by the traditional on-site drilling and cutting sampling. The one-step molding of the composite test block is realized, and meanwhile, compared with field sampling, the labor loss and the time waste of sample preparation are greatly reduced, and the preparation cost is reduced.
Description
Technical Field
The invention relates to a combined die for a composite rock mass sample, in particular to a device and a method for manufacturing the combined die for the conventional direct shear test sample of the composite rock mass.
Background
Layered composite rock stratums, special geologic bodies, are widely distributed in nature, and are formed by rock stratums with different lithological properties alternately after long-term complex geologic structure movement and weathering erosion. Unlike single lithologic rock, the layered composite rock has the characteristics of heterogeneity, discontinuity, anisotropy and the like, and the mechanical properties of the layered composite rock are influenced not only by the mechanical properties of structural surfaces among layers, but also by the mechanical properties of the layers, the inclination angles of the structural surfaces and other factors. The internal joint cracks are obvious, the combination between layers is very tight, and rocks and soil made of different materials are piled up in a staggered mode, so that the stability and the safety of rock engineering are very important. When external force is applied, relative displacement and friction are generated among different rock formations, and the factors cause cracks to be generated in the laminated rock body and expand along with the increase of stress. Therefore, in order to research the joint change and the crack propagation process of the stratified rock body in the composite stratum, the stratum state needs to be simulated and loaded by using the composite test block, and the mesoscopic analysis of the change in the composite stratum is realized. And mastering the change rule based on indoor research data, and summarizing layered rock body joint distribution and rock body structure characteristics.
The study in the past is less to be related to the design and manufacture of compound rock mass assembling die and the compound rock mass test of joint class, and the student adopts cylindric double-deck rock mass test piece to develop single-axis compression test at present more, and the process and the crackle form that research its is damaged by loading, and in the actual engineering, more what people explored to the underground space is the state of multilayer rock mass atress, and then the problem that meets just more and more also more, and the problem that the shield constructs the machine and wears to the cutter and even destroys when tunnelling in the complex stratum is also more and more serious. Particularly in the construction of urban subways and underwater tunnels, when the shield tunneling machine passes through sandy gravel, hard rock, soil-rock composite strata and the like for a long distance, the phenomena of abrasion, damage, falling and the like of a shield tunneling cutter frequently occur, and the shield tunneling machine is forced to stop in serious cases, which becomes one of the important problems troubling shield construction in China. When the Wuhan subway No. 8 line river crossing slurry shield passes through a sandy soil stratum, the abrasion conditions of the toothed cutter and the front tearing cutter are normal; after entering the soil-rock composite stratum, the cutter is seriously abraded, which indicates that the serrated knife and the front tearing knife are not suitable for cutting the stratum; after the hob is replaced, the abrasion of the cutter is still serious, and the cutter is mostly abnormally abraded such as eccentric wear, cutter ring crack and the like. The study of domestic and foreign scholars on soil and structural surfaces is more, and the existing study shows that the roughness of the structural interface, the property of soil and the shear rate are all key factors influencing the shear characteristics of the contact surface. Therefore, the invention tests the composite rock mass test piece according to the rock mass shear failure mode under the actual working condition.
The interaction between the compacted soil filling material and the concrete simulated surrounding rock is realized through a fluctuating interface, the deformation mode and the failure mechanism of the test piece are researched through a conventional direct shear test, and the mechanical mechanism of the interaction between the filling body formed after the soil filling material is filled and compacted and the concrete simulated surrounding rock is researched. Scholars at home and abroad mainly carry out similarity test, numerical simulation and mechanical test research on deformation and damage characteristics of a near-horizontal layered composite rock mass, and few studies on mechanical properties of the composite rock mass considering different contact surface forms are carried out. The research on the mechanical characteristics of the soil body is carried out mainly by referring to the research method and results of geotechnical mechanics, and the properties of the surrounding rock are not fully considered. The influence of the Barton curve on the rough surface is generally researched, and the linear relation between the JRC and the shearing strength is obtained through derivation by jolt et al, the shearing characteristic of the contact surface is influenced by two parts respectively, one part is related to the JRC, and the friction of the shearing teeth and the protrusions is included, namely the strength of the roughness contribution. The other part is equivalent to the frictional resistance, which is related to the normal stress and the internal friction angle. Therefore, the rock is simulated by using a simulation material with a certain proportion, the influence of roughness and shearing rate on the soil-rock interface is explored through a direct shear experiment of the contact surface of sand, clay and cement mortar, the crack development process and the damage surface of the soil-rock interface are summarized, and the critical normal stress values of different normal stresses and soil body damage and contact surface damage in different stages are analyzed.
In addition, related documents at home and abroad do much research work aiming at the interaction mechanism of the cementing surface of the composite surrounding rock and provide three soil body supporting mechanisms, namely surface supporting, local supporting, integral supporting and the like. By applying motion constraint to the displacement of different soil rock mass boundaries and implementing a shear test, the progressive spatial failure rule of the rock mass contact surface of the composite rock mass cementing surface under different stress conditions is researched. The method is an effective method for researching the interaction mechanism of the soil body and the surrounding rock through an indoor mechanical direct shear test, but the mechanical test is carried out by drilling and sampling on a multi-mining site at present.
In actual natural environment, due to the displacement of the rock mass of the composite stratum caused by the underground engineering and the shield movement, the passive resistance effect and the damages of various forms including the destructive modes such as tensile damage, shearing damage, extrusion damage and the like are generated, so that the rock mass and the soil stratum gradually form a soil body with certain strength and integrity in the moving process and are cemented with surrounding rocks. On the basis of the theory, the failure criterion of the jointed rock mass with different interfaces is obtained by researching the failure mode of the rock mass. The method is favorable for predicting the damage form of the soil body generated by proper constraint in the actual natural environment, and provides theoretical and practical reference functions for the overall support of the rock mass structure. Therefore, the invention tests the composite rock mass test piece according to the rock mass shear failure mode under the actual working condition. The invention mainly aims to better research the contents of different cementing surface roughness curve damage characteristics, cracks of a multi-jointed rock body after loading and the like. The manufactured composite sample can more conveniently explore the shear failure mode, the stress-strain characteristic and the like of the composite rock mass. Some deep understanding of basic mechanical properties of the layered composite rock stratum is needed, and the deformation failure mechanism of the layered composite rock stratum is recognized, so that certain reference and guidance significance is provided for engineering practice.
Disclosure of Invention
The invention aims to provide a conventional direct shear test sample manufacturing combined die device and a manufacturing method for manufacturing a composite rock mass and a soil and surrounding rock composite rock mass with different cementing surfaces, design the conventional direct shear test sample manufacturing combined die device and the manufacturing method for the composite rock mass, and improve a common soil mass indoor mechanical test research method in a composite stratum.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a conventional direct shear test sample preparation assembling die device of compound rock mass, includes shear box, JRC steel form, base template, concora crush board, reaction frame, pours the template, square JRC steel form and shear box are equipped with to base template top, two fixing bolt that the base template set up through the symmetry are connected with the reaction frame, the last forcing valve and the fixed jackscrew of being equipped with of reaction frame, the below of fixed jackscrew is provided with and arranges in concora crush board in the shear box cavity and constitutes pressure device.
Furthermore, the JRC steel template is cast by five cementing surface square structures with different fluctuation forms, and the splicing and pouring of the composite test block are realized through the shearing box and the pouring template.
Furthermore, a JRC steel formwork clamping groove, a shearing box fixing clamping groove and a bolt hole for fixing the reaction frame are formed in the base formwork.
Furthermore, the shearing box is composed of a steel plate structure surrounded by four sides, and has no upper and lower bottom surfaces, and two convex shearing box lugs are arranged at the lower edges of the front and rear steel plates and correspond to the two shearing box fixing clamping grooves on the base template.
Furthermore, two installation clamping grooves are symmetrically formed in the lower portion of the pouring template and correspond to the two lug structures of the shearing box, and therefore the combined die device is stable on the vibrating table.
Furthermore, the reaction frame consists of supporting steel columns, supporting steel beams, fixed jackscrews and rotary pressure valves, the supporting steel beams are fixedly connected through two supporting steel column base templates, and the middle parts of the supporting steel beams are connected with the fixed jackscrews and the rotary pressure valves through rotary screw holes.
Further, the JRC steel template is used for molding the cementing surface form of the soil surrounding rock material, a bonding interface required by a test is generated by over-compaction, and the bonding interface has 10 groups of standard interface types.
A method for manufacturing a conventional direct shear test sample of a composite rock mass adopts the conventional direct shear test sample of the composite rock mass to manufacture a combined die device, and comprises the following steps: firstly, filling a manufactured soil surrounding rock material into a square cavity filled with a shearing box, sealing a composite rock mass soil surrounding rock sample by using a flat pressing plate, a JRC steel template and the shearing box, acting the lower surface of the flat pressing plate on the soil surrounding rock material, carrying out pressure loading on the flat pressing plate by rotating a pressure valve, determining the degree of applied pressure according to the soil type of the composite rock mass, and meeting the requirement of the optimal water content; after the soil filler is pressurized, inverting the shear box, installing a rock mass pouring template, filling a concrete rock simulation material, and placing the concrete rock simulation material on a vibration table to vibrate uniformly and compactly; and then placing the prepared sample and the mold in a curing room for natural curing for 48 hours, removing the pouring template, placing the composite rock mass test block and shear box assembly in the curing room at the humidity of 95% and the temperature of 18-25 ℃ for curing for 28 minutes, polishing the test piece into a standard test piece after the assembly is cured, and carrying out direct shear and pressure loading tests.
Compared with the prior art, the invention has the beneficial effects that:
the invention aims at similar materials commonly used in indoor shear tests, simulates and manufactures a layered composite rock sample, designs and processes a mold specially used for manufacturing the layered composite rock sample, adopts similar materials such as ordinary portland cement, quartz sand, plaster of paris and the like, prepares a layered composite rock sample consisting of two hard rock and soft rock similar materials with different mechanical properties, and manufactures the two similar materials into a single rock sample. Processing and preparing samples of different rock stratum joints, and researching and analyzing relevant mechanical properties of the laminated composite rock stratum through a series of proportioning tests and indoor shear tests. And (3) constructing a simulation model of the layered composite rock stratum sample, verifying the indoor shear test result of the layered composite rock stratum sample, facilitating the comparative study of the test and the simulation, and deeply analyzing the deformation failure mechanism of the layered composite rock stratum.
The method comprises the steps of manufacturing a soil surrounding rock material, filling the soil surrounding rock material into a square hole cavity provided with a shearing box, sealing a composite rock mass soil surrounding rock sample by utilizing a flat pressing plate, a JRC steel template and the shearing box which are used in a device structure, acting the lower surface of the flat pressing plate on the soil surrounding rock material, carrying out pressure loading on the flat pressing plate by rotating a pressure valve, determining the degree of applied pressure according to the soil type of the composite rock mass, and meeting the requirement of the optimal water content. After the soil filler is pressurized, the shear box is inverted, a rock mass pouring template is installed, a concrete rock simulation material is filled in the shear box, and the shear box is placed on a vibration table to vibrate uniformly and compactly. Placing the manufactured sample and the mold in a curing room for natural curing for 48 hours, removing a pouring template, placing the composite rock mass test block and shearing box assembly in the curing room for curing for 28 days at room temperature with the humidity of 95% and the temperature of 18-25 ℃, polishing the test piece into a standard test piece after the assembly is cured, and carrying out direct shearing and pressure loading tests. The invention avoids the damage to the sample caused by the traditional on-site drilling and cutting sampling, reduces the manufacturing cost,
therefore, the invention enriches the convenience degree of the composite samples with different cementing surfaces and avoids the damage to the samples and the uncertainty of the interface distribution requirement caused by the traditional on-site drilling and cutting sampling. The one-step molding of the composite test block is realized, and meanwhile, compared with field sampling, the labor loss and the time waste of sample preparation are greatly reduced, and the preparation cost is reduced.
Drawings
FIG. 1 is a schematic view of a modular mold apparatus of the present invention;
FIG. 2 is a schematic view of a base template structure;
FIG. 3 is a schematic view of a shear box construction;
FIG. 4 is a schematic diagram of a JRC steel formwork structure;
FIG. 5 is a diagram showing the effect of a common standard roughness curve of a JRC steel template;
FIG. 6 is a schematic view of the reaction frame structure;
FIG. 7 is a schematic structural view of a casting form;
FIG. 8 is a schematic view of a mold apparatus in combination;
fig. 9 is a schematic view of a loaded composite rock mass test block.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and the described embodiments are obviously only embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. The invention is described in detail by the preferred scheme of the test mould with the combination of the attached drawings and the embodiment:
as shown in fig. 1 to 8, the combined die device for manufacturing the conventional direct shear test sample of the composite rock mass comprises a base template 1, a shear box 2, a reaction frame 3, a flat pressing plate 4, a pouring template 5 and a JRC steel template 6.
The square JRC steel template 6 and the shearing box 2 are arranged above the base template 1, two position fixing lugs are symmetrically arranged on the upper portion of the shearing box 2, the base template 1 is connected with the reaction frame 3 through two fixing bolts symmetrically arranged, a pressure valve 3-1 and a fixed jackscrew 3-2 are arranged on the reaction frame 3, a flat pressure plate 4 arranged in a cavity of the shearing box 2 is arranged below the fixed jackscrew 3-2, and the pressure device is sequentially formed by connecting structures.
The invention aims at similar materials commonly used in indoor shear tests, simulates and manufactures a layered composite rock sample, designs and processes a mold specially used for manufacturing the layered composite rock sample, adopts similar materials such as ordinary portland cement, quartz sand, plaster of paris and the like, prepares a layered composite rock sample consisting of two hard rock and soft rock similar materials with different mechanical properties, and manufactures the two similar materials into a single rock sample. Processing and preparing samples of different rock stratum joints, and researching and analyzing relevant mechanical properties of the laminated composite rock stratum through a series of proportioning tests and indoor shear tests. And (3) constructing a simulation model of the layered composite rock stratum sample, verifying the indoor shear test result of the layered composite rock stratum sample, facilitating the comparative study of the test and the simulation, and deeply analyzing the deformation failure mechanism of the layered composite rock stratum.
As shown in fig. 2, the base template 1 is a steel plate with a thickness of 30mm, and a JRC steel template slot 1-1, a shear box fixing slot 1-2 and a bolt hole 1-3 are arranged on the steel plate. The steel template clamping groove 1-1 is used for fixing JRC steel templates 6 with different interfaces, and is 150mm long, 150mm wide and 20mm deep; the shearing box fixing clamping groove 1-2 is used for fixing the shearing box 2 so that the shearing box 2 cannot displace in the pressurizing process, and has the length of 20mm, the width of 5mm and the depth of 5 mm; the bolt holes 1-3 are used for fixing bolts of the reaction frame 3, the diameter of the bolts is 15mm,
as shown in fig. 3, the shear box 2 is composed of a steel plate structure surrounded by four sides, and has no upper and lower bottom surfaces, two convex shear box lugs 2-1 are arranged at the lower edges of the front and rear steel plates, corresponding to the two fixing slots, the thickness of the shear box 2 is 10mm, the length of the shear box lugs 2-1 is 20mm, and the width and height are 5 mm.
As shown in fig. 4, the JRC steel formwork 6 is cast by five cementing surface square structures with different fluctuation forms, and the splicing and casting of the composite test block can be realized by the shear box and the casting formwork. A flat pressing plate with the thickness of 10mm is arranged at the upper part of the shearing box and used for pressing soil materials in the shearing box.
The JRC steel form 6 is mainly used for molding the cemented surface form of the soil surrounding rock material, the cemented interface required by the test is generated by overcompaction, the length and width of the cemented interface are 150mm, the height of the average height plane of the highest point and the lowest point of the undulation surface of the JRC steel form and the bottom surface of the steel form is 20mm, the cemented surface is JRC 0, JRC 3, JRC 5, JRC 7, JRC 9, JRC 11, JRC 13, JRC 15, JRC 17, JRC 19, and 10 sets of standard interface types, and the JRC steel form model effect is shown in fig. 5.
Ten commonly used standard roughness curves were derived using the design theory of the rough surface of the JRC steel form. The method adopts a fluctuation amplitude characterization method, and is specifically expressed as follows:
the systematic quantitative study was carried out according to ten classical profiles proposed in the scholars Barton's related literature, and the relationship between the root mean square of the first derivative (Z2) as the main parameter and the Structure Function (SF) quantifying the degree of surface relief and the bond surface roughness curve (JRC) was studied. Accordingly, functional relations between the parameters and the JRC are respectively established. The research result shows that the two parameters of Z2 and SF have higher sensitivity to JRC, and the specific functional relation is as follows:
JRC＝32.2+32.471gZ2
JRC＝37.28+16.581gSF
the Barton-derived joint profile is improved by a fourier transform method, and the functional relation of Z2 and SF and JRC is obtained by a linear regression method as follows:
JRC＝32.69+32.981gZ2
JRC＝37.63+16.51gSF
the method is characterized in that a datum line which can penetrate through the whole joint is defined, and the fluctuation degree of the joint is researched so as to accurately represent the roughness of the joint. The different roughness cemented surfaces are respectively expressed as JRC 0, JRC 3, JRC 5, JRC 7, JRC 9, JRC 11, JRC 13, JRC 15, JRC 17, JRC 19, and 10 sets of standard cemented interfaces are plotted as shown in fig. 5.
As shown in fig. 6, the reaction frame 3 is composed of a plurality of split structures. The reaction frame 3 is arranged above the base template 1 and is connected with the base template 1 through a fixing bolt, and the reaction frame 3 consists of a rotary pressure valve 3-1, a fixing jackscrew 3-2, a supporting steel column 3-3 and a supporting steel beam 3-4. Two bolt mounting holes 1-3 are respectively arranged on the supporting steel beams 3-4 and the base template 1. Two internal threads are arranged on the supporting steel beam 3-4, the supporting steel column 3-3 and the supporting steel beam 3-4 are fixedly connected through the internal threads, a screw hole is formed in the middle of the supporting steel beam 3-4 in a rotating mode, and the fixed jackscrew 3-2 and the rotary pressurizing valve 3-1 are connected through the rotating screw hole. Wherein the diameter of 3-3 supporting steel columns is 20mm, the height is 250mm, the length of the connecting bolt parts at two ends is 20mm, and the diameter is 14 mm. The rotary pressurizing valve 3-1 can realize rotation and act on the flat pressing plate 4 to realize pressure loading, and meanwhile, the structure is stable, and the required soil body interface form is obtained.
As shown in fig. 7, two mounting slots 5-1 are symmetrically arranged at the lower part of the pouring template 5, which correspond to the two mounting lugs of the shear box 2, so that the combined device is kept stable on the vibration table.
After the composite rock mass test block is manufactured, as shown in a figure 9, the length, the width and the height of the composite rock mass test block are 150mm, a pouring template is removed, a shear box is reserved, a sample is placed on a shear test bed for a shear test, certain pressure is applied to the upper portion of the sample, and shear force is applied to the left rock part of the sample and the right shear box part of the sample respectively to obtain a test result.
The invention relates to a method for manufacturing a conventional direct shear test sample of a composite rock mass, which adopts the combined die device and comprises the steps of firstly filling a manufactured soil surrounding rock material into a square cavity provided with a shear box, sealing the soil surrounding rock sample of the composite rock mass by using a flat pressing plate, a JRC steel template and the shear box, acting the lower surface of the flat pressing plate on the soil surrounding rock material, carrying out pressure loading on the flat pressing plate by rotating a pressure valve, determining the degree of applied pressure according to the soil type of the composite rock mass, and meeting the requirement of the optimal water content; after the soil filler is pressurized, inverting the shear box, installing a rock mass pouring template, filling a concrete rock simulation material, and placing the concrete rock simulation material on a vibration table to vibrate uniformly and compactly; and then placing the manufactured sample and the mold in a curing room for natural curing for 48 hours, removing the pouring template, placing the composite rock mass test block and shear box assembly in the curing room for curing for 28 days at room temperature with the humidity of 95% and the temperature of 18-25 ℃, polishing the test piece into a standard test piece after the maintenance of the assembly is completed, and carrying out direct shear and pressure loading tests. The invention avoids the damage to the sample caused by the traditional on-site drilling and cutting sampling, reduces the manufacturing cost, and has the three-dimensional effect in the process of die combination and assembly as shown in figure 8.
In the embodiment, the combined die device and the method for manufacturing the conventional direct shear test sample of the composite rock mass adopt the following technical scheme:
step 1: fixing the base template and the reaction frame by bolts in sequence according to the installation sequence, and assembling the combined die device;
step 2: filling a material of a soil sample into the shear box according to the composite rock and soil mass sample;
and step 3: placing the flat pressing plate above the soil sample, and rotating the pressurizing valve to reduce the pressure to be in contact with the flat pressing plate and apply pressure;
and 4, step 4: determining the degree of applied pressure according to the soil quality type of the composite rock mass, obtaining the optimal water content of the soil sample, enabling the flat pressing plate to be at the height matched with the flat pressing plate, and continuously filling the soil sample to enable the flat pressing plate to be flush with the bottom surface;
and 5: taking out the combination of the soil sample and the shearing box, inverting the combination on a vibrating table to enable the fluctuation surface of the combination to face the upper side, and pouring the concrete surrounding rock simulation material into a square cavity formed by the assembled pouring templates; uniformly stirring the materials according to a mixing ratio (water: cement (NO: 325): sand: 1:2:4), fully vibrating the materials on a vibrating table, and trowelling the upper surface of a sample;
step 6: vibrating the sealed sample and the die device uniformly, taking the sealed sample off, naturally curing for 48h, and then removing the die;
and 7: the filling body after the sample is demoulded is continuously maintained in a maintenance room for a specified time, generally 28 days, the maintenance temperature is 20 ℃, the soil temperature is 1 ℃, and the maintenance humidity is more than 95 percent;
and 8: polishing the composite rock mass sample after being maintained for a specified time to prepare a standard test piece;
and step 9: the sample preparation method comprises the following steps: the joint surface of the JRC steel template of the combined die device for the conventional direct shear test and sample manufacturing of the composite rock mass is divided into 10 groups of standard interface types, wherein the JRC is 0, 3, 5, 7, 9, 11, 13, 15, 17 and 19.
Claims (8)
1. The utility model provides a conventional direct shear test sample preparation assembling die device of compound rock mass which characterized in that: including shearing box, JRC steel form, base template, flat clamp plate, reaction frame, pouring template, square JRC steel form and shearing box are equipped with to base template top, the base template is connected with the reaction frame through two fixing bolt that the symmetry set up, the last forcing valve and the fixed jackscrew of being equipped with of reaction frame, the below of fixed jackscrew is provided with the flat clamp plate of arranging in the shearing box cavity, constitutes pressure device.
2. The device for manufacturing the combined die for the conventional direct shear test sample of the composite rock mass according to claim 1, is characterized in that: the JRC steel template is cast by five cementing surface square structures with different fluctuation forms, and the splicing and pouring of the composite test block are realized through the shearing box and the pouring template.
3. The device for manufacturing the combined die for the conventional direct shear test sample of the composite rock mass according to claim 1, is characterized in that: the base template is provided with a JRC steel template clamping groove, a shearing box fixing clamping groove and a bolt hole for fixing the reaction frame.
4. The device for manufacturing the combined die for the conventional direct shear test sample of the composite rock mass according to claim 1, is characterized in that: the shearing box is composed of a steel plate structure surrounded by four surfaces, the shearing box is not provided with an upper bottom surface and a lower bottom surface, and two convex shearing box lugs are arranged at the lower edges of the front steel plate and the rear steel plate and correspond to the two shearing box fixing clamping grooves on the base template.
5. The device for manufacturing the combined die for the conventional direct shear test sample of the composite rock mass according to claim 1, is characterized in that: and two mounting clamping grooves are symmetrically arranged at the lower part of the pouring template and correspond to the structures of the two lugs of the shearing box, so that the combined die device is kept stable on the vibration table.
6. The device for manufacturing the combined die for the conventional direct shear test sample of the composite rock mass according to claim 1, is characterized in that: the reaction frame is composed of supporting steel columns, supporting steel beams, fixed jackscrews and rotary pressure valves, the supporting steel beams are fixedly connected through two supporting steel column base templates, and the middle parts of the supporting steel beams are connected with the fixed jackscrews and the rotary pressure valves through rotary screw holes.
7. The device for manufacturing the combined die for the conventional direct shear test sample of the composite rock mass according to claim 1, is characterized in that: the JRC steel template is used for molding the cementing surface form of the soil surrounding rock material, a bonding interface required by a test is generated by over-compaction, and the bonding interface has 10 groups of standard interface types.
8. A method for manufacturing a conventional direct shear test sample of a composite rock mass, which adopts the conventional direct shear test sample of the composite rock mass to manufacture a combined die device according to any one of claims 1 to 7, and is characterized by comprising the following steps: firstly, filling a manufactured soil surrounding rock material into a square cavity filled with a shearing box, sealing a composite rock mass soil surrounding rock sample by using a flat pressing plate, a JRC steel template and the shearing box, acting the lower surface of the flat pressing plate on the soil surrounding rock material, carrying out pressure loading on the flat pressing plate by rotating a pressure valve, determining the degree of applied pressure according to the soil type of the composite rock mass, and meeting the requirement of the optimal water content; after the soil filler is pressurized, inverting the shear box, installing a rock mass pouring template, filling a concrete rock simulation material, and placing the concrete rock simulation material on a vibration table to vibrate uniformly and compactly; and then placing the prepared sample and the mold in a curing room for natural curing for 48 hours, removing the pouring template, placing the composite rock mass test block and shear box assembly in the curing room at the humidity of 95% and the temperature of 18-25 ℃ for curing for 28 minutes, polishing the test piece into a standard test piece after the assembly is cured, and carrying out direct shear and pressure loading tests.
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| CN113776914A (en) * | 2021-09-24 | 2021-12-10 | 广西大学 | Integrated manufacturing device and manufacturing method for structural surface upper and lower disc test piece in stress environment |
| CN113933139A (en) * | 2021-09-29 | 2022-01-14 | 中国地质大学（武汉） | Sample preparation mold and sample preparation method for rock similar material |
| CN114152490A (en) * | 2021-11-29 | 2022-03-08 | 内蒙古大学 | Sample preparation device for frozen soil material fracture test and use method thereof |
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| CN113933139A (en) * | 2021-09-29 | 2022-01-14 | 中国地质大学（武汉） | Sample preparation mold and sample preparation method for rock similar material |
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| CN114152490A (en) * | 2021-11-29 | 2022-03-08 | 内蒙古大学 | Sample preparation device for frozen soil material fracture test and use method thereof |
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| CN116973240A (en) * | 2023-09-25 | 2023-10-31 | 中铁建工集团有限公司 | Concrete structure intensity testing arrangement |
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