Lateral confinement one-way compression test device for obtaining crushing strength of blocky and powdery coal rock mass and intelligent identification method

Abstract

The invention relates to the technical field of mine rock mass mechanics research, in particular to a lateral confinement one-way compression test device for obtaining the crushing strength of blocky and powdery coal and rock masses and an intelligent identification method. The intelligent identification method comprises the following steps: acquiring the crushing strength range of blocky and powdery coal and rock masses by adopting a lateral confinement one-way compression test device for acquiring the crushing strength of the blocky and powdery coal and rock masses; the test device comprises a hydraulic integrated device, an intelligent sensing fixed base, a lump powder tank and a detachable piston, a calculation system is arranged in the intelligent sensing fixed base, and the calculation system is based on an intelligent algorithm for estimating the tangent cross distance of a high-pressure area of threshold segmentation and linear regression and is used for calculating the lump powder tank according to the extrusion and crushing process of powdered and lump coal and rock mass. According to the method, a pressure-density semi-logarithmic relation curve is obtained through pressure testing, then a low-pressure threshold value area and a high-pressure threshold value area are obtained according to the curve, and then the crushing strength range of the powdery and blocky coal and rock mass is obtained, so that the technical blank can be filled, and the safety during underground mining operation is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of mine rock mass mechanics research, and in particular to a confined unidirectional compression test device and an intelligent identification method for obtaining the crushing strength of blocky and powdered coal rock masses. Background Art

[0002] As global energy demand continues to climb, coal mining depths are expanding to depths of kilometers at an average annual rate of 5-8 meters. This trend has led to a nonlinear deterioration in the stress environment of the surrounding rock of underground projects. The coupling of high ground stress, high karst water pressure, and complex geological structures at depth has caused the proportion of unfavorable geological bodies, such as rock fracture zones and loose coal strata, to increase dramatically from 15%-20% at shallow depths to 40%-60% at depth. These geological bodies exhibit significant heterogeneity, anisotropy, and rheological properties. Accurately assessing their mechanical properties has become a core technical challenge to ensure safe coal mine production.

[0003] In current engineering practice, rock mass mechanical properties testing technology has significant application limitations. Traditional testing methods based on point load tests and uniaxial compression tests, whose theoretical models are based on continuum mechanics, are only applicable to rock masses with an integrity coefficient greater than 0.75 and are unable to reflect the true mechanical behavior of broken rock masses. While grouting reinforcement-assisted testing can improve rock mass integrity through pre-reinforcement, the uncontrollable slurry penetration effect in coal-rock masses with a mixed block-powder structure leads to a high dispersion of test results of 30%-50%, failing to meet the engineering design requirements for strength parameter accuracy (errors must be controlled within 10%). This technical gap has directly led to design errors of 20%-35% in the anchoring force of anchor rods (cables) in deep tunnel support design, and the incidence of roof collapse accidents is 2-3 times higher than that in shallow mines, resulting in significant safety hazards during underground operations. Summary of the Invention

[0004] Based on this, it is necessary to provide a side-confined unidirectional compression test device and intelligent identification method for obtaining the crushing strength of blocky and powdered coal rock masses, in response to the current technical gap in measuring the crushing strength of blocky and powdered coal rock masses, which leads to major safety hazards during underground operations.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A device for testing the crushing strength of block and powdered coal rock masses with a confined unidirectional compression, the device comprising a hydraulic integration device, an intelligent sensing fixed base provided on the hydraulic integration device, a block powder tank detachably provided on the intelligent sensing fixed base, the inner wall of the block powder tank being polished and configured to accommodate block and powdered coal rock masses; a detachable piston detachably provided on the block powder tank, the piston portion of the detachable piston being inserted into the block powder tank and forming a sliding fit with the inner wall of the block powder tank, and the piston portion of the detachable piston being able to slide along the axis of the block powder tank under the action of the hydraulic integration device , and can extrude the block and powdered coal rock; the intelligent sensing fixed base is equipped with a computing system, and the computing system is based on an intelligent algorithm for estimating the tangent cross-intersection distance of the high-pressure zone of threshold segmentation and linear regression, and is configured to obtain a pressure-density semi-logarithmic relationship curve through pressure testing according to the extrusion and crushing process of the block and powdered coal rock, and then identify the low-pressure threshold area and the high-pressure threshold area according to the curve, and respectively derive the function equations f(x) and g(x) of the high-pressure threshold area and the low-pressure threshold area, and then respectively calculate the intersection of the tangent of f(x) and the X-axis and the intersection of the tangent of g(x) and the X-axis, and the distance between the two intersections is the crushing strength range of the block and powdered coal rock.

[0007] Furthermore, the computing system includes a pressure sensor, a displacement sensor and a controller. The pressure sensor is configured to measure the pressure exerted on the blocky and powdered coal rock mass; the displacement sensor is configured to monitor the stroke of the piston portion of the detachable piston; the controller is electrically connected to the pressure sensor and the displacement sensor at the same time, and is configured to receive the pressure signal transmitted by the pressure sensor and the displacement signal transmitted by the displacement sensor, and to obtain a pressure-density semi-logarithmic relationship curve through pressure testing based on an intelligent algorithm for estimating the tangent cross-intersection distance in the high-pressure zone of threshold segmentation and linear regression.

[0008] Furthermore, the intelligent sensing fixed base is also equipped with an automatic alarm device, which is configured to alarm and stop the hydraulic integration device when the pressure on the block and powdered coal rock sensed by the pressure sensor is greater than a first preset value, or when the difference between the pressure on the block and powdered coal rock sensed by the pressure sensor and the pressure applied by the hydraulic integration device is greater than a second preset value.

[0009] Furthermore, a detachable hoop is fixedly sleeved on the block powder tank.

[0010] Further, a plurality of movable supports are circumferentially arranged on the intelligent perception fixed base, the movable supports can slide in the radial direction of the block powder tank, can be fixed on the intelligent perception fixed base, and are configured to support the block powder tank in the axial direction.

[0011] Further, the detachable hoop is made of TC4 titanium alloy or TC18 titanium alloy.

[0012] Further, the intelligent perception fixed base is made of HT250 cast iron or HT300 cast iron.

[0013] Further, the block powder tank is made of 45Cr alloy steel or 45 steel.

[0014] Further, the detachable piston is made of 4032 aluminum alloy or 4043 aluminum alloy.

[0015] The application also provides an intelligent identification method for obtaining the breaking strength of block and powder coal rock mass, and adopts a side-limit unidirectional compression test device for obtaining the breaking strength of block and powder coal rock mass.

[0016] a: a preparation stage, block and powder coal rock mass is poured into a block powder tank, then a detachable piston is detachably installed on the block powder tank, then a detachable hoop is fixedly sleeved on the block powder tank to form a sealed container, then the block powder tank is detachably installed on an intelligent perception fixed base, then a movable support is moved to a suitable position and fixed on the intelligent perception fixed base, and then the intelligent perception fixed base is placed at a hydraulic station of the hydraulic integrated device;

[0017] b: a test stage, the hydraulic integrated device is started, the down pressure speed of the hydraulic integrated device is adjusted to 0.5-1.0 MPa / s, real-time feedback data and dynamic curve generation are realized through an intelligent algorithm based on threshold segmentation and linear regression high-pressure area cutting horizontal distance estimation of the calculation system, when the high threshold linear area is reached, the hydraulic integrated device is closed and the breaking strength data range of the block and powder coal rock mass is output;

[0018] c: an end stage, the hydraulic integrated device is unloaded, then the detachable piston and the detachable hoop are detached, then the sample is saved, then the breaking strength data range of the block and powder coal rock mass is exported and the equipment is closed, and then the detachable piston and the block powder tank are cleaned.

[0019] The application has the following beneficial effects:

[0020] The present application relates to a kind of obtaining the lateral confinement uniaxial compression test device and intelligent identification method of block and powder coal rock mass breaking strength, by setting the calculation system of intelligent algorithm of high-pressure area tangent horizontal distance estimation based on threshold segmentation and linear regression, can obtain a pressure-density semi-logarithmic relationship curve according to the extrusion breaking process of block and powder coal rock mass by pressure test, then according to the curve, the breaking strength range of block and powder coal rock mass is obtained, to fill the technical gap, ensure the safety of underground mining operation.

[0021] Further, compared with prior art, the lateral confinement uniaxial compression test device for obtaining the breaking strength of block and powder coal rock mass is exquisite in structure, less rock sample is required for measurement, and multiple tests can be supported with the same sample size, which significantly improves the test efficiency and saves test cost.

[0022] Further, by setting the detachable hoop, the overall stability of the device can be improved, and the smooth progress of the test can be ensured.

[0023] Further, by setting the movable support, the block powder tank can be supported in the axial direction, which can improve the overall stability of the device and ensure the smooth progress of the test.

[0024] Further, by setting the automatic alarm device, when the pressure sensed by the pressure sensor is greater than the first preset value, or the pressure sensed by the pressure sensor and the pressure applied by the hydraulic integrated device are greater than the second preset value, the automatic alarm device can automatically alarm and stop the hydraulic integrated device, which can avoid invalid test and ensure the accuracy of measurement results and the safe progress of test. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The three-dimensional structure schematic diagram of the lateral confinement uniaxial compression test device for obtaining the breaking strength of block and powder coal rock mass without hydraulic integrated device is provided for the embodiments of the present application;

[0026] Figure 2 The three-dimensional structure schematic diagram of the lateral confinement uniaxial compression test device for obtaining the breaking strength of block and powder coal rock mass is provided for the embodiments of the present application;

[0027] Figure 3 The pressure-density semi-logarithmic relationship curve diagram when block and powder coal rock mass is extruded and broken is provided for the embodiments of the present application.

[0028] Among them:

[0029] 1, Intelligent perception fixed base; 101, sliding groove; 2, detachable piston; 3, detachable hoop; 4, block powder tank; 5, hydraulic integrated device; 6, movable support. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application in detail with reference to the embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0031] The serial numbers of components in the present application, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. In the present application, "connection" and "coupling" include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0033] The embodiments of the present application will be described below with reference to Figure 1 and Figure 2 to describe a uniaxial compression test device with lateral restraint for obtaining the crushing strength of block and powder coal rock mass, which is particularly suitable for obtaining the crushing strength of block and powder coal rock mass, and of course, it is also equally suitable for obtaining the crushing strength of other kinds of ores.

[0034] Specifically, the side-confined unidirectional compression test device for obtaining the crushing strength of block and powdered coal rock is configured to include a hydraulic integration device 5; an intelligent sensing fixed base 1 is provided on the hydraulic integration device 5, and the intelligent sensing fixed base 1 is a cylindrical structure as a whole and is vertically arranged when installed; a block powder tank 4 is vertically arranged on the top of the intelligent sensing fixed base 1, and a receiving groove is coaxially opened on the top of the block powder tank 4, and the receiving groove is used to receive block and powdered coal rock, a groove is coaxially opened on the bottom of the block powder tank 4, and a bolt is coaxially and fixedly provided on the top of the intelligent sensing fixed base 1, and the block powder tank 4 is installed When installed, it is connected to the bolt through a groove thread; a detachable piston 2 is provided on the top of the block powder tank 4, and the detachable piston 2 has a base part and a piston part, wherein the base part is an annular sleeve structure, and is threadedly connected to the top of the block powder tank 4 when installed, and the piston part is inserted into the block powder tank 4 when installed, and forms a sliding fit with the inner wall of the block powder tank 4. The inner wall of the block powder tank 4 is polished to ensure the smooth sliding of the piston part. Under the action of the hydraulic integrated device 5, the piston part of the detachable piston 2 can slide along the direction of the axis of the block powder tank 4, and can squeeze block and powdered coal rock.

[0035] The intelligent sensing fixed base 1 has a built-in computing system, which is based on an intelligent algorithm for estimating the tangent cross-intersection distance in the high-pressure zone of threshold segmentation and linear regression, and is configured to be able to calculate the crushing process of the coal and rock mass in the form of blocks and powders, such as Figure 3 As shown in the figure, a pressure-density semi-logarithmic relationship curve is obtained through pressure testing, and then the low-pressure threshold area and the high-pressure threshold area are identified based on the curve, and the function equations f(x) and g(x) of the high-pressure threshold area and the low-pressure threshold area are obtained respectively. Then, the intersection of the tangent of f(x) and the X-axis and the intersection of the tangent of g(x) and the X-axis are calculated respectively. The distance between the two intersections is the crushing strength range of blocky and powdered coal rock masses. Compared with the uniaxial compression test that is only applicable to intact rock masses and the grouting reinforcement method that cannot handle mixed media, this device realizes the accurate test of the crushing strength of blocky and powdered coal rock masses through lateral constraint and intelligent algorithm. At the same time, by quantifying the crushing strength range and the residual rate of agglomerates, it provides data support for the design of roof support parameters and roadway stability assessment in deep coal mines, thereby reducing the risk of safety accidents caused by misjudgment of rock mechanical properties.

[0036] Specifically, after measuring the curve D-lgP of the relative density D of the coal rock mass in a lump or powder form and the pressure, the residual percentage f of the agglomerates in the coal rock mass in a lump or powder form formed under a certain pressure can be determined by the following method:

[0037] It can be seen from the D-lgP curve that there is a relationship:

[0038] dD / dlgP=K (K is a constant);

[0039] Before the agglomerate is broken, D depends on the porosity θ' between the agglomerates, and is irrelevant to the porosity inside the agglomerate, and D = 1 - θ', because

[0040] θ' = 1 - [(Va+Vm) / v] = 1 - [1 + (1 / Da-1)f]D;

[0041] In the formula, V is the volume of the block and powder coal rock mass, Va is the pore volume inside the agglomerate, Vm is the net volume of the powder, Da is the relative density of the agglomerate, f is the percentage of the agglomerate, D is the relative density of the block and powder coal rock mass, and further,

[0042] dD / dlgP = DaK / [(1-Da)f+Da];

[0043] When the external force P is less than the initial breaking pressure P1 of the agglomerate, f is the percentage f0 of the initial powder in the agglomerate, and at this time D-lgp is a straight line, that is, the low-pressure linear region, and the slope K' = DaK / [(1-Da)f0+Da].

[0044] When the external force P is greater than the initial breaking pressure P2 of the agglomerate, f = 0, and at this time D-lgp is also a straight line, that is, the high-pressure linear region, and the slope is K.

[0045] When P1 < P < P2, the agglomerate is partially broken, and the percentage f is obtained from dD / dlgP = DaK / [(1-Da)f+Da], wherein K and K' = dD / dlgp can be obtained from the curve, and Da = K' / K.

[0046] In further embodiments, the computing system is set to include a pressure sensor, a displacement sensor, and a controller, wherein the pressure sensor is configured to be able to measure the pressure borne by the block and powder coal rock mass, and the range is not less than 60 MPa, which can cover the stress range of the deep coal mine roadway surrounding rock (usually 10-40 MPa), and sufficient safety margin is reserved to cope with the extremely high ground stress scene; the accuracy is not less than 0.5% FS (full scale accuracy), the piezoresistive pressure sensor and 24-bit Σ-Δ type ADC converter are used, and micro-volt level signal analysis is realized; the sampling frequency is ≥100 Hz, which meets the stress mutation capture demand in the rapid loading process; the PT100 temperature sensor is built-in, the environmental temperature compensation from-20°C to 80°C is realized through the polynomial fitting algorithm, and the temperature drift is ≤0.01% / °C.

[0047] The displacement sensor is configured to monitor the stroke of the piston part of the detachable piston 2, and the range is not less than 110 mm, matching the effective height of the block powder tank 4, reserving sufficient margin to monitor the excessive compression after the sample is compacted; the precision is not less than 0.5% FS (full scale accuracy), the magnetostrictive displacement sensor is used, the non-contact measurement avoids mechanical wear, and the protection level reaches IP68; the linearity control is ≤±0.01%, the non-linear error of the sensor is corrected through a multi-point calibration algorithm, and the linearity of the displacement-electrical signal conversion is ensured; the synchronous clock trigger is used with the pressure sensor, and the timestamp consistency error of the pressure-displacement data is ≤1 ms.

[0048] The controller can use an ARM Cortex-A53 multi-core processor with a main frequency of ≥1.2 GHz, equipped with 2GB DDR4 memory, to meet the real-time data processing and complex algorithm operation requirements, and is configured to receive the pressure signal transmitted by the pressure sensor and the displacement signal transmitted by the displacement sensor, and can calculate the volume and density change according to the displacement signal transmitted by the displacement sensor, and at the same time, according to the pressure signal transmitted by the pressure sensor, based on the intelligent algorithm of threshold segmentation and linear regression high-pressure area tangent intersection distance estimation, a pressure-density semi-logarithmic relationship curve is obtained.

[0049] In further embodiments, to ensure the accuracy of the measurement results and the safe performance of the test, the intelligent sensing fixed base 1 is further provided with an automatic alarm device, which is configured to alarm and stop the hydraulic integrated device 5 when the pressure borne by the blocky and powdery coal rock body sensed by the pressure sensor is greater than a first preset value, or the difference between the pressure borne by the blocky and powdery coal rock body sensed by the pressure sensor and the pressure applied by the hydraulic integrated device 5 is greater than a second preset value.

[0050] Specifically in this embodiment, the first preset value can be set to 60 Mpa. When the pressure borne by the blocky and powdery coal rock body sensed by the pressure sensor is greater than 60 Mpa, it indicates that the blocky and powdery coal rock body contained in the block powder tank 4 contains other hard mineral materials, resulting in a large actual deviation of the test results, so the alarm and stop of the hydraulic integrated device 5 are performed, thereby avoiding invalid tests while ensuring the accuracy of the measurement results and the safe performance of the test. The second preset value can be set to 5 Mpa, and when the difference between the pressure borne by the blocky and powdery coal rock body sensed by the pressure sensor and the pressure applied by the hydraulic integrated device 5 is greater than 5 Mpa, it indicates that the pressure sensor and / or the hydraulic integrated device 5 is abnormal, resulting in a large actual deviation of the test results, so the alarm and stop of the hydraulic integrated device 5 are performed, thereby avoiding invalid tests while ensuring the accuracy of the measurement results and the safe performance of the test.

[0051] In some other embodiments, in order to improve the structural strength of the block powder tank 4, a detachable hoop 3 is sleeved on the block powder tank 4, and the detachable hoop 3 has a circular ring structure.

[0052] In further embodiments, in order to avoid the block powder tank 4 from being tilted and affecting the test results, a plurality of sliding grooves 101 are arranged on the top of the intelligent sensing fixed base 1 in the circumferential direction, the sliding grooves 101 extend in the radial direction of the intelligent sensing fixed base 1, and each sliding groove 101 is slidably provided with a movable support 6. The movable support 6 has a triangular structure and can be fixed on the intelligent sensing fixed base 1 by bolts or elastic catches, so as to support the block powder tank 4 in the axial direction.

[0053] In the embodiment, the number of the sliding grooves 101 can be four, which are uniformly arranged in the circumferential direction. Correspondingly, the number of the movable supports 6 can be four.

[0054] In some other embodiments, the material of the detachable hoop 3 is TC4 titanium alloy or TC18 titanium alloy.

[0055] In other embodiments, the inner diameter of the detachable hoop 3 is 58-66 mm, the outer diameter is 68-76 mm, and the detachable hoop 3 is configured to fix an object with a pressure in the range of 0-100 MPa. Preferably, the inner diameter of the detachable hoop 3 is 58 mm, and the outer diameter is 68 mm.

[0056] In some other embodiments, the material of the intelligent sensing fixed base 1 is HT250 cast iron or HT300 cast iron.

[0057] In other embodiments, the diameter of the intelligent sensing fixed base 1 is 200-300 mm, and the height is 30-45 mm. The diameter of the bolt is 30-35 mm, and the height is 10-15 mm. Preferably, the diameter of the intelligent sensing fixed base 1 is 300 mm, and the height is 30 mm. The diameter of the bolt is 30 mm, and the height is 10 mm.

[0058] In some other embodiments, the material of the block powder tank 4 is 45Cr alloy steel or 45 steel.

[0059] In other embodiments, the block powder tank 4 has a double-layer tubular structure, the upper layer has an inner diameter of 48-56 mm, an outer diameter of 58-66 mm, and a height of 110-120 mm, and the lower layer has a diameter of 58-66 mm and a height of 20-25 mm. The groove has a diameter of 30-35 mm and a depth of 10-15 mm. Preferably, the upper layer of the block powder tank 4 has an inner diameter of 48 mm, an outer diameter of 58 mm, and a height of 120 mm, and the lower layer has a diameter of 58 mm and a height of 20 mm. The groove has a diameter of 30 mm and a depth of 10 mm.

[0060] In other embodiments, the diameter of the piston part of the detachable piston 2 is 48-56 mm, the thickness is 30-35 mm, and the height is 80-88 mm; the inner diameter of the base part is 58-66 mm, and the outer diameter is 63-71 mm. Preferably, the diameter of the piston part of the detachable piston 2 is 48 mm, the thickness is 30 mm, and the height is 80 mm, and the inner diameter of the base part is 58 mm, and the outer diameter is 63 mm.

[0061] In other embodiments, the height of the movable bracket 6 is 30-34 mm, and it is configured to be able to fix objects with a pressure of 0-70 MPa.

[0062] In other embodiments, the range of the hydraulic integrated device 5 is 0-600 KN.

[0063] Another embodiment of the present application also provides an intelligent identification method for obtaining the crushing strength of blocky and powdery coal rock mass, which uses a side-limit uniaxial compression test device for obtaining the crushing strength of blocky and powdery coal rock mass. The intelligent identification method for obtaining the crushing strength of blocky and powdery coal rock mass is set to include the following steps:

[0064] a: In the initial preparation stage of the experiment, the operator needs to first pour the pre-prepared block material to be tested into the block-powder tank 4 through a standardized process. To ensure experimental accuracy, this step needs to be completed in a clean environment and a precision electronic balance is used for weighing calibration. Then, wash and dry the detachable piston 2, then assemble it to the block-powder tank 4, then evenly tighten the high-strength reinforced detachable hoop 3 in three times through a hexagonal wrench, forming a detachable block-powder tank with a multi-seal structure. Next, the assembled block-powder tank 4 is seamlessly connected with the intelligent sensing fixed base 1 through precision bolts, then the movable bracket 6 is stably moved to the fixed area along the sliding groove 101, and is rigidly connected with bolts to enhance the structural stability, then the intelligent sensing fixed base 1 switch is turned on.

[0065] b: In the test phase, after starting the hydraulic integrated device 5, the intelligent identification algorithm based on threshold segmentation and linear regression high-pressure area cutting transverse distance estimation is loaded to the hydraulic integrated device 5, and then the hydraulic integrated device 5 is accurately controlled to the process interval of 0.5-1.0 MPa / s. At this time, the intelligent perception fixed base 1 and the hydraulic system form a two-way data closed loop: on the one hand, real-time acquisition of pressure, displacement, volume and other key parameters, on the other hand, dynamic feedback to the hydraulic integrated system through the high-precision sensor network, generating a pressure-density semi-logarithmic relationship curve, realizing data cross-validation and automatic calibration of abnormal values, and when abnormal data occurs, the intelligent perception fixed base 1 can analyze the reason for this situation in time and transmit it to the hydraulic integrated device 5. If the reason for the abnormal data is operation error or load too large instrument damaged, etc. can be corrected in time, the intelligent perception fixed base 1 can terminate the experiment process in time, reduce the time loss, when the compression curve enters the preset high threshold linear deformation area, stop in time, and automatically generate the range of breaking strength data.

[0066] c: After the test is completed, first gradually reduce the pressure of the hydraulic system to the safety threshold, confirm that the pressure gauge is zeroed, and then unload the hydraulic integrated device 5. Then, the movable support 6 is smoothly removed from the fixed area, the detachable hoop 3 is loosened using a hexagonal wrench, the detachable piston 2 is slowly disassembled, the sample is taken out and saved, after the test is completed, the breaking strength data obtained by the intelligent identification algorithm is exported, the intelligent perception fixed base 1 and the hydraulic integrated device 5 are turned off in turn, and then the detachable piston 2 and the block powder tank 4 are cleaned, and the measurement operation is completed.

[0067] The technical features of the above embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0068] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application.

Claims

1. A confined uniaxial compression test device for obtaining the crushing strength of massive and powdered coal and rock masses, characterized in that: The side-limited unidirectional compression test device for obtaining the crushing strength of block and powdered coal rock comprises a hydraulic integration device, the hydraulic integration device is provided with an intelligent sensing fixed base, the intelligent sensing fixed base is detachably provided with a block powder tank, the inner wall of the block powder tank is polished and configured to be able to place block and powdered coal rock; the block powder tank is detachably provided with a detachable piston, the piston part of the detachable piston is inserted into the block powder tank, and forms a sliding fit with the inner wall of the block powder tank, and under the action of the hydraulic integration device, the piston part of the detachable piston can slide along the direction of the axis of the block powder tank, and can squeeze the block and powdered coal rock. Coal rock mass; the intelligent sensing fixed base is equipped with a computing system, which is based on an intelligent algorithm for estimating the cross-intersection distance of the tangent in the high-pressure zone of threshold segmentation and linear regression, and is configured to obtain a pressure-density semi-logarithmic relationship curve through pressure testing according to the extrusion and crushing process of the block and powdered coal rock mass, and then identify the low-pressure threshold zone and the high-pressure threshold zone according to the curve, and respectively derive the function equations f(x) and g(x) of the high-pressure threshold zone and the low-pressure threshold zone, and then respectively calculate the intersection of the tangent of f(x) and the X-axis and the intersection of the tangent of g(x) and the X-axis, and the distance between the two intersection points is the crushing strength range of the block and powdered coal rock mass.

2. The confined uniaxial compression test device for obtaining the crushing strength of blocky and powdered coal and rock masses according to claim 1, characterized in that: The computing system includes a pressure sensor, a displacement sensor, and a controller. The pressure sensor is configured to measure the pressure on the massive and powdered coal rock mass; the displacement sensor is configured to monitor the stroke of the piston portion of the detachable piston. The controller is electrically connected to the pressure sensor and the displacement sensor at the same time, and is configured to receive the pressure signal transmitted by the pressure sensor and the displacement signal transmitted by the displacement sensor, and can obtain a pressure-density semi-logarithmic relationship curve through pressure testing based on an intelligent algorithm for estimating the high-pressure area tangent cross-intersection distance based on threshold segmentation and linear regression.

3. The confined uniaxial compression test device for obtaining the crushing strength of blocky and powdered coal and rock masses according to claim 2, characterized in that: The intelligent sensing fixed base also has a built-in automatic alarm device, which is configured to alarm and stop the hydraulic integration device when the pressure on the block and powdered coal rock sensed by the pressure sensor is greater than a first preset value, or when the difference between the pressure on the block and powdered coal rock sensed by the pressure sensor and the pressure applied by the hydraulic integration device is greater than a second preset value.

4. The confined uniaxial compression test device for obtaining the crushing strength of blocky and powdered coal and rock masses according to claim 1, characterized in that: A detachable hoop is fixedly sleeved on the block powder tank.

5. The confined uniaxial compression test device for obtaining the crushing strength of blocky and powdered coal and rock masses according to claim 4, characterized in that: A plurality of movable brackets are circumferentially arranged on the smart sensing fixed base. The movable brackets can slide in the radial direction of the block powder tank and can be fixed on the smart sensing fixed base, and are configured to support the block powder tank in the axial direction.

6. The confined uniaxial compression test device for obtaining the crushing strength of blocky and powdered coal and rock masses according to claim 4, characterized in that: The material of the detachable hoop is TC4 titanium alloy or TC18 titanium alloy.

7. The confined uniaxial compression test device for obtaining the crushing strength of blocky and powdered coal and rock masses according to claim 1, characterized in that: The material of the intelligent sensing fixed base is HT250 cast iron or HT300 cast iron.

8. The confined uniaxial compression test device for obtaining the crushing strength of blocky and powdered coal and rock masses according to claim 1, characterized in that: The block powder tank is made of 45Cr alloy steel or 45 steel.

9. The confined uniaxial compression test device for obtaining the crushing strength of blocky and powdered coal and rock masses according to claim 1, characterized in that: The material of the detachable piston is 4032 aluminum alloy or 4043 aluminum alloy.

10. An intelligent identification method for obtaining the crushing strength of massive and powdered coal rock mass, using the confined uniaxial compression test device for obtaining the crushing strength of massive and powdered coal rock mass according to claim 5, characterized in that: The intelligent identification method for obtaining the crushing strength of massive and powdered coal rock masses comprises the following steps: a: In the preparation stage, the block and powdered coal rock mass is poured into the block powder tank, and then the detachable piston is detachably mounted on the block powder tank, and then the detachable hoop is fixedly sleeved on the block powder tank to form a closed container, and then the block powder tank is detachably mounted on the intelligent sensing fixed base, and then the movable bracket is moved to a suitable position and fixed on the intelligent sensing fixed base, and then the intelligent sensing fixed base is placed at the hydraulic station of the hydraulic integration device; b: During the testing phase, the hydraulic integrated device is started and the pressing speed of the hydraulic integrated device is adjusted to 0.5-1.0 MPa / s. The intelligent algorithm of the high-pressure zone tangent cross-intersection distance estimation based on threshold segmentation and linear regression is used by the computing system to provide real-time data feedback and generate a dynamic curve. When the high-threshold linear region is reached, the hydraulic integrated device is shut down and the crushing strength data range of the blocky and powdered coal rock mass is output; c: Ending stage: Unload the hydraulic integrated device, then remove the detachable piston and the detachable hoop, then save the sample, then derive the crushing strength data range of the block and powdered coal rock mass and turn off the equipment, then clean the detachable piston and the block powder tank.

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