CN114047040A - Preparation method for remolding large-volume rock sample in drilling method sinking hob breaking weak cemented rock test - Google Patents
Preparation method for remolding large-volume rock sample in drilling method sinking hob breaking weak cemented rock test Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 267
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- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 292
- 239000010959 steel Substances 0.000 claims abstract description 292
- 239000002245 particle Substances 0.000 claims abstract description 78
- 239000000853 adhesive Substances 0.000 claims abstract description 37
- 230000001070 adhesive effect Effects 0.000 claims abstract description 37
- 238000007596 consolidation process Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 73
- 238000005056 compaction Methods 0.000 claims description 35
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Abstract
The invention discloses a preparation method for remolding a large-volume rock sample in a well drilling method shaft sinking hob crushing weak cemented rock test, which comprises the following steps: preparing rock particles; adding water into the rock particles and stirring to obtain weakly cemented rock particle clay with uniaxial compressive strength of R0(ii) a Pouring the weakly cemented rock particle sticky body into a remolding steel barrel; applying pressure to obtain a remolded weakly cemented rock cylinder; preparing a remolded weakly cemented rock sample, and measuring the uniaxial compressive strength value R of the sample; adjusting the mixing ratio of water and the consolidation pressure value, and repeating the steps until the obtained R0Greater than or equal to R; the mass ratio of water to rock particles is denoted as X; manufacturing and installing a remolded rock sample steel mold, preparing a weakly cemented rock particle adhesive body with the mass ratio of water to rock particles being X, and filling the weakly cemented rock particle adhesive body into the remolded rock sample steel mold; and compacting and consolidating to obtain the remolded weakly consolidated large-volume rock sample. The invention has simple and convenient operation and easy formationThe method solves the problem that large-volume rock samples cannot be successfully processed in weak cemented rock tests.
Description
Technical Field
The invention relates to the technical field of preparation of large-volume rock samples. In particular to a preparation method for remolding a large-volume rock sample in a drilling method, a sinking hob breaking test and a weak cemented rock test.
Background
The formation environment, the diagenesis period and the deposition process of the Jurassic and chalky strata of the coal mining area represented by Erdos, Mongolian and northern Shaanxi in the west have certain particularity, the stratum mainly comprises the sedimentary sandstone formed by erosion, alteration, compaction and cementation of granular substances and cementing substances, and has the characteristics of low strength, poor cementing performance, easy weathering, disturbance sensitivity and the like, and particularly, the sedimentary sandstone is easy to soften, argillize, disintegrate and the like after meeting water, so that the mechanical property of the sedimentary sandstone is deteriorated and the strength of the sedimentary sandstone is greatly reduced. In recent years, under the strategic requirements of coal resource development and the promotion of coal resource requirements in China, the distribution trend of a shaft project to be newly built in a weakly consolidated stratum in western regions is increased, and a drilling method with the advantages of high mechanization degree, automatic drilling control, unmanned underground and the like is an important drilling technology for promoting the unmanned, mechanical and intelligent high-quality development of shaft construction of the weakly consolidated stratum in western mining regions. However, efficient mechanical rock breaking and precise drilling technology are one of the key technical bottlenecks that restrict well drilling, and the efficiency of mechanical rock breaking determines the drilling speed. Therefore, the rock breaking efficiency of the cutter in the well drilling process of the drilling method is analyzed, and a series of rock breaking efficiency test research systems aiming at breaking weakly cemented rock by a hob of the well drilling method are established, so that design optimization of the rock breaking cutter and rock breaking parameters is realized.
Because the weakly cemented rock particles have the characteristics of low cementing degree, sensitive disturbance and the like, the rock is easy to break, when the cemented rock is subjected to an indoor common mechanical experiment, the finished product rate of processing a standard cylinder (50mm multiplied by 100mm) sample is very low, large-volume (1500mm multiplied by 500mm multiplied by 300mm) undisturbed rock blocks for an indoor full-size mechanical rock breaking experiment cannot be processed, the requirement of a hob rock breaking experiment cannot be met, and the research on the mechanism and efficiency of hob breaking of the weakly cemented rock is severely restricted. Therefore, the existing processing technology of the large-volume weak cemented rock sample is urgently needed to be improved, so that the processed rock sample test piece can meet the requirements of a full-size hob rock breaking test.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the preparation method for remolding the large-volume rock sample in the drilling method sinking hob broken weak cemented rock test, which is simple and convenient to operate and easy to process and can ensure that the remolded weak cemented rock meets the hob broken rock test, so as to solve the problem that the large-volume rock sample cannot be successfully processed in the current weak cemented rock test.
In order to solve the technical problems, the invention provides the following technical scheme:
a preparation method for remolding a large-volume rock sample in a drilling method sinking hob breaking weak cemented rock test comprises the following steps:
(1) mechanically crushing original weak cemented rock blocks with different sizes of fractured block sizes on the engineering site to obtain rock particles; adding water into the rock particles and stirring to obtain weakly cemented rock particle adherends; measuring the average value of the uniaxial compressive strength of the undisturbed weakly cemented rock and recording as R0；
(2) Installing a reaction frame device, pouring the weakly cemented rock particle adhesive into a remolding steel barrel of the reaction frame device in a layered manner, and performing primary vibration on each layer by adopting a compaction hammer until the weakly cemented rock particle adhesive is compacted;
(3) applying pressure to the weakly cemented rock particle adherends in the remolding steel barrel for compaction and consolidation, so that the weakly cemented rock particle adherends form remolded weakly cemented rock cylinders in the remolding steel barrel;
(4) cutting the remolded weakly cemented rock cylinder to obtain a remolded weakly cemented rock sample, and measuring the uniaxial compressive strength value of the remolded weakly cemented rock sample and recording as R;
(5) comparison of R0And the value of R, according to R0And R isAdjusting the doping ratio of water in the step (1) and the value of the consolidation pressure parameter in the step (3) by the difference between the two, and repeating the steps (1) to (4) until R is greater than or equal to R0(ii) a At this time, the mass ratio of water to rock particles in step (1) is recorded as X, and the final consolidation pressure value applied in step (3) is recorded as M0；
(6) Manufacturing and installing a remolded rock sample steel mold, then preparing the weakly cemented rock particle adhesive body according to the method in the step (1) with the mass ratio of water to rock particles being X, and loading the weakly cemented rock particle adhesive body into the remolded rock sample steel mold in layers, wherein each layer is subjected to primary vibration by adopting a compaction hammer until the weakly cemented rock particle adhesive body is compacted;
(7) after the remolded rock sample steel mould is filled with the weakly cemented rock particle adhesive, applying pressure to the remolded rock sample steel mould in a grading manner for compaction and consolidation, wherein the pressure applied during compaction and consolidation is greater than or equal to the consolidation pressure value M obtained in the step (5)0(ii) a And compacting and consolidating to obtain the remolded weakly consolidated large-volume rock sample.
According to the preparation method for remolding the large-volume rock sample in the drilling method sinking hob breaking weak cementation rock test, in the step (1), the granularity of the rock particles is 0-10 mm; in the step (2), the thickness of the weakly cemented rock particle paste filled in each layer is 1/5 of the height of the remodeling steel barrel; in step (6), the thickness of the weakly cemented rock particle paste filled in each layer is 1/4 of the height of the remolded rock sample steel mould.
In the step (2), the reaction frame device comprises a reaction frame cover plate, a base drainage plate, a remolded steel barrel, an air compressor case and a pressure control meter; the reaction frame cover plate is arranged above the upper surface of the air compressor case through a telescopic upright post, a transmission rod is fixedly arranged on the lower surface of the reaction frame cover plate, and the transmission rod is perpendicular to the lower surface of the reaction frame cover plate; the base drainage plate is fixedly arranged on the upper surface of the air compressor case and is positioned right below the reaction frame cover plate; the pressure control meter is fixedly arranged on the upper surface of the reaction frame cover plate, and a signal input end of the pressure control meter penetrates through the reaction frame cover plate to be connected with a signal output end of the transmission rod; the signal input end of the transmission rod extends into the remolding steel barrel from the top of the remolding steel barrel, a pressure sensor is arranged between the end face of the transmission rod and the weakly cemented rock particle adhesive body, and the pressure sensor is electrically connected with the signal input end of the transmission rod; the bottom of the remolding steel barrel is fixedly arranged on the upper surface of the base drainage plate; and the air compressor case is provided with a compressor controller.
According to the preparation method for remolding the large-volume rock sample in the well drilling method sinking hob breaking weak cemented rock test, the interior of the remolding steel barrel is sequentially detachably provided with the porous permeable steel pad, the upper fiber filter screen, the weak cemented rock particle adhesive body, the lower fiber filter screen and the lower porous permeable steel pad from top to bottom, and the cross sections of the upper porous permeable steel pad, the upper fiber filter screen, the lower fiber filter screen and the lower porous permeable steel pad are parallel to each other and are vertical to the central axis of the remolding steel barrel; the lower surface of the upper porous water-permeable steel pad is in close contact with the upper surface of the upper fiber filter screen, and the lower surface of the lower fiber filter screen is in close contact with the upper surface of the lower porous water-permeable steel pad; the cross sectional areas of the upper porous water-permeable steel pad, the upper fiber filter screen, the lower fiber filter screen and the lower porous water-permeable steel pad are all smaller than or equal to the cross sectional area of the remolded steel barrel, and the upper porous water-permeable steel pad and the upper fiber filter screen can move up and down along the inner wall of the remolded steel barrel in the remolded steel barrel;
the signal input end of the transmission rod abuts against the upper porous water-permeable steel mat, a space between the upper fiber filter screen and the lower fiber filter screen is filled with the weakly cemented rock particle adhesive body, and the lower surface of the lower porous water-permeable steel mat is communicated with the base drainage plate through fluid.
In the preparation method for remolding large-volume rock samples in the drilling method sinking hob breaking weak cemented rock test, in the step (2) and the step (3), the remolding steel barrel is 50mm in inner diameter and 200mm in height; in step (4), the diameter of the remolded weakly cemented rock sample is 50mm, and the height is 100 mm.
In the preparation method for remolding the large-volume rock sample in the well drilling method sinking hob crushing weak cementation rock test, in the step (3), a uniaxial compression test device is used for measuring an R value, and the uniaxial compression test device comprises a control system, a data acquisition instrument, a control cabinet and a rock uniaxial servo press; the signal input end of the control system is connected with the signal output end of the data acquisition instrument, the signal input end of the data acquisition instrument is connected with the signal output end of the rock uniaxial servo press, and the signal input end of the rock uniaxial servo press is connected with the signal input and output end of the control cabinet;
in the step (3), the remolded weakly cemented rock sample is placed on a cushion block of the rock uniaxial servo press, and a pressure head of the rock uniaxial servo press is positioned right above the remolded weakly cemented rock sample.
In the step (3), pressure is applied in a graded pressurizing mode, the loading duration of each stage of pressure is 12 hours, pressurization is carried out in 3 grades in total, the pressure applied from the first stage to the third stage is 4MPa, 8MPa and 12MPa in sequence, when the third stage loading pressure is greater than or equal to 12MPa, the pressure application is finished, and the third stage applied pressure 12MPa is M0(ii) a In the step (6), the pressure application mode is also classified into 3 grades for pressurization, and the pressure application from the first grade to the third grade is 1/3M0 MPa、2/3M0MPa and M0MPa, the loading duration of each stage of pressure is 24h, and when the third stage loading pressure is more than or equal to M0And when the pressure is MPa, ending the pressure application.
In the step (6), the remolded rock sample steel die comprises an upper steel plate, a lower steel plate, a first wide side steel plate, a second wide side steel plate, a first long side steel plate and a second long side steel plate; the upper steel plate and the lower steel plate are parallel to each other, the first wide-side steel plate and the second wide-side steel plate are parallel to each other, and the first long-side steel plate and the second long-side steel plate are parallel to each other; the first wide side steel plate, the second wide side steel plate, the first long side steel plate and the second long side steel plate are fixedly connected with each other through bolts to form a long square frame; the lower steel plate is provided with a rectangular groove, the rectangular groove is matched with a rectangle formed by the wall bottom of the long square frame, and the long square frame is fixedly arranged on the lower steel plate through the rectangular groove; the length of the upper steel plate is less than or equal to the distance between the inner wall of the first wide-side steel plate and the inner wall of the second wide-side steel plate, and the width of the upper steel plate is less than or equal to the distance between the inner wall of the first long-side steel plate and the inner wall of the second long-side steel plate; the lower steel plate is provided with a drain hole, and two ends of the upper steel plate are provided with upper steel plate lifting points;
an upper porous permeable steel pad, an upper fiber filter screen, a weakly cemented rock particle sticky body, a lower fiber filter screen and a lower porous permeable steel pad are detachably arranged in the remolded rock sample steel mold from top to bottom in sequence, and the cross sections of the upper porous permeable steel pad, the upper fiber filter screen, the lower fiber filter screen and the lower porous permeable steel pad are parallel to each other and are vertical to the central axis of the remolded steel barrel; the lower surface of the upper porous water-permeable steel pad is in close contact with the upper surface of the upper fiber filter screen, and the lower surface of the lower fiber filter screen is in close contact with the upper surface of the lower porous water-permeable steel pad; the cross sectional areas of the upper porous water-permeable steel pad, the upper fiber filter screen, the lower fiber filter screen and the lower porous water-permeable steel pad are all smaller than or equal to the cross sectional area of the remolded rock sample steel mold, and the upper porous water-permeable steel pad and the upper fiber filter screen can move up and down along the inner wall of the remolded rock sample steel mold in the remolded rock sample steel mold;
a space between the upper fiber filter screen and the lower fiber filter screen is filled with a weakly cemented rock particle adhesive body, a pressure sensor is arranged in the weakly cemented rock particle adhesive body, and a signal output end of the pressure sensor extends out of the remolded rock sample steel mold through a sensor data line; and the lower surface of the lower porous permeable steel pad is communicated with the drainage hole on the lower steel plate through fluid.
According to the preparation method for remolding the large-volume rock sample in the drilling method sinking hob breaking weak cementation rock test, the length of the inner cavity of the remolded rock sample steel die is 1500mm, the width of the inner cavity of the remolded rock sample steel die is 500mm, and the height of the inner cavity of the remolded rock sample steel die is 400 mm; the first wide side steel plate, the second wide side steel plate, the first long side steel plate and the second long side steel plate are all 80mm thick; the depth of the rectangular groove is 30mm, the number of the drain holes on the lower steel plate is 3, and the thickness of the lower steel plate is 100 mm.
In the step (7), a multifunctional compaction test bed is adopted to apply pressure to the remolded rock sample steel mould in a grading manner for compaction and consolidation, and the multifunctional compaction test bed comprises vertical supporting legs, a loading cross beam, a loading oil cylinder and a loading cover plate; the multifunctional compaction test bed comprises a multifunctional compaction test bed table board, a loading cross beam and a loading cross beam, wherein the multifunctional compaction test bed table board is provided with two vertical supporting legs, the two vertical supporting legs are symmetrically arranged at two ends of the table board of the multifunctional compaction test bed, longitudinal sliding grooves are formed in the two vertical supporting legs, and two ends of the loading cross beam are respectively connected with the two vertical supporting legs in a sliding mode through the longitudinal sliding grooves; one end of the loading oil cylinder is fixedly connected with the bottom surface of the loading cross beam through a connecting piece, and the other end of the loading oil cylinder is fixedly connected with the upper surface of the loading cover plate through a connecting piece; and the lower surface of the loading cover plate is abutted against an upper steel plate of the remolded rock sample steel mould.
The technical scheme of the invention achieves the following beneficial technical effects:
the preparation method for remolding the large-volume rock sample in the test of breaking the weakly consolidated rock by the drilling method sinking hob is simple and convenient to operate, the rock sample is easy to succeed, and the problem that the large-volume rock sample cannot be successfully processed in the current weakly consolidated rock test is solved. In addition, the large-volume weakly cemented rock sample prepared by the method is provided with the pressure sensor, so that the pressure value in the rock sample preparation process can be monitored, and the pressure data in the rock breaking test process by the hob can be collected more easily.
Drawings
FIG. 1 is a schematic view of the reaction frame assembly of the present invention;
FIG. 2 is a schematic view of the mounting structure of the remoulded steel barrel in the invention;
FIG. 3 is a schematic view of a uniaxial compression test apparatus according to the present invention;
FIG. 4 is a schematic structural diagram of a remolded rock sample steel mold in the present invention;
FIG. 5 is a schematic sectional structure diagram of a remolded rock sample steel mold in the invention;
FIG. 6 is a schematic view of the multifunctional test bed compaction device according to the present invention;
FIG. 7 is a flow chart of the preparation of a remodeled bulk rock sample according to the present invention.
The reference numbers in the figures denote: 1-pressure control gauge; 2-a telescopic upright post; 3-reshaping the steel barrel; 4-base drain board; 5-air compressor case; 6-lower porous permeable steel pad; 7-laying a fiber filter screen; 8-a compressor controller; 9-installing a fiber filter screen; 10-arranging a porous permeable steel pad; 11-a transmission rod; 12-reaction frame cover plate; 13-a control system; 14-a data acquisition instrument; 15-pressure head; 16-remodeling the weakly cemented rock sample; 17-cushion blocks; 18-a control cabinet; 19-connecting bolts; 20-rectangular groove; 21-a drain hole; 22-lifting the steel plate; 23-upper steel plate; 24-lower steel plate; 25-a second long side steel plate; 26-a first broad-sided steel plate; 27-a second broad-sided steel plate; 28-a first long side steel plate; 29-a pressure sensor; 30-sensor data line; 31-remolding a rock sample steel mould; 32-vertical support legs; 33-a loading beam; 34-a loading oil cylinder; 35-loading the cover plate; 36-rock uniaxial servo press; 37-weakly cemented rock particle cement.
Detailed Description
As shown in fig. 7, a preparation method of a large-volume rock sample remolded by a drilling method sinking hob breaking weak cemented rock test comprises the following steps:
(1) mechanically crushing original weak cemented rock blocks with different sizes of fractured block sizes on the engineering site to obtain rock particles; adding water into the rock particles and stirring to obtain weakly cemented rock particle adherends; determination of uniaxial compressive strength of undisturbed weakly cemented rockAverage value, denoted as R0In this example, R was measured0＝10MPa；
(2) Installing a reaction frame device, pouring the weakly cemented rock particle adhesive into a remolding steel barrel of the reaction frame device in a layering manner, and performing primary vibration on each layer by adopting a compaction hammer until the weakly cemented rock particle adhesive is compacted;
(3) applying pressure to the weakly cemented rock particle adhesive body in the remolding steel barrel to perform compaction and consolidation, so that the weakly cemented rock particle adhesive body forms a remolded weakly cemented rock cylinder in the remolding steel barrel;
(4) cutting the remolded weakly cemented rock cylinder after the remolded weakly cemented rock cylinder is demoulded to obtain a remolded weakly cemented rock sample, and measuring the uniaxial compressive strength value of the remolded weakly cemented rock sample and recording as R;
(5) comparison of R0And the value of R, according to R0Adjusting the doping ratio of water in the step (1) and the consolidation pressure parameter value in the step (3) by the difference value between the R and the R, and repeating the steps (1) to (4) until the obtained R value is more than or equal to 10 MPa; at the moment, the mass ratio of the water to the rock particles in the step (1) is 16%, and the consolidation pressure value M applied in the step (3)0＝12MPa；
(6) Manufacturing and installing a remolded rock sample steel mold, then preparing weakly cemented rock particle adhesive according to the method in the step (1) and with the mass ratio of water to rock particles being 16%, and loading the weakly cemented rock particle adhesive into the remolded rock sample steel mold in layers, wherein each layer is subjected to preliminary vibration by adopting a compaction hammer until the weakly cemented rock particle adhesive is compacted;
(7) after the remolded rock sample steel mould is filled with the weakly cemented rock particle adhesive, applying pressure to the remolded rock sample steel mould in a grading manner for compaction and consolidation, wherein the pressure applied during compaction and consolidation is greater than or equal to the consolidation pressure value obtained in the step (5) and is 12 MPa; and compacting and consolidating to obtain the remolded weakly consolidated large-volume rock sample.
In the step (1), the granularity of rock particles is 0-10 mm; in the step (2), the thickness of each layer of the filled weakly cemented rock particle adhesive body is 1/5 of the height of the remolded steel barrel; in step (6), the thickness of each layer of packed weakly cemented rock particle paste is 1/4 of the height of the remolded steel die. In the embodiment, the height-diameter ratio of the remolded steel barrel (for preparing the small-volume rock sample) is 4:1, and the height-width ratio of the remolded rock sample steel mold (for preparing the large-volume rock sample) is 0.8:1, so that the small-volume rock sample is higher in height and more difficult to compact, the number of layers of the small-volume rock sample is larger, and the cross-sectional area of the large-volume rock sample is larger, so that the aim of compacting can be achieved by filling in 4 layers without filling in 5 layers like the preparation of the small-volume rock sample during layered filling.
In step (2), as shown in fig. 1, the reaction frame device comprises a reaction frame cover plate 12, a base drain plate 4, a remolding steel drum 3, an air compressor case 5 and a pressure control table 1; the reaction frame cover plate 12 is installed above the upper surface of the air compressor case 5 through a telescopic upright post 2, a transmission rod 11 is fixedly installed on the lower surface of the reaction frame cover plate 12, and the transmission rod 11 is perpendicular to the lower surface of the reaction frame cover plate 12; the base drain board 4 is fixedly arranged on the upper surface of the air compressor case 5 and is positioned right below the reaction frame cover plate 12; the pressure control table 1 is fixedly arranged on the upper surface of the reaction frame cover plate 12, and the signal input end of the pressure control table 1 penetrates through the reaction frame cover plate 12 to be connected with the signal output end of the transmission rod 11; the signal input end of the transmission rod 11 extends into the remolding steel barrel 3 from the top of the remolding steel barrel 3, a pressure sensor is arranged between the end surface of the transmission rod 11 and the weakly cemented rock particle adhesive body, and the pressure sensor is electrically connected with the signal input end of the transmission rod 11; the bottom of the remolding steel barrel 3 is fixedly arranged on the upper surface of the base drainage plate 4; and a compressor controller 8 is arranged on the air compressor case 5.
As shown in fig. 2, an upper porous water-permeable steel mat 10, an upper fiber filter screen 9, a lower fiber filter screen 7 and a lower porous water-permeable steel mat 6 are detachably arranged in the remolding steel barrel 3 from top to bottom in sequence, and the cross sections of the upper porous water-permeable steel mat 10, the upper fiber filter screen 9, the lower fiber filter screen 7 and the lower porous water-permeable steel mat 6 are parallel to each other and are perpendicular to the central axis of the remolding steel barrel 3; the lower surface of the upper porous water-permeable steel pad 10 is in close contact with the upper surface of the upper fiber filter screen 9, and the lower surface of the lower fiber filter screen 7 is in close contact with the upper surface of the lower porous water-permeable steel pad 6; the upper porous water-permeable steel pad 10 and the upper fiber filter screen 9 are in clearance fit with the inner wall of the remolding steel barrel 3, the cross-sectional areas of the upper porous water-permeable steel pad 10, the upper fiber filter screen 9, the lower fiber filter screen 7 and the lower porous water-permeable steel pad 6 are all smaller than or equal to the cross-sectional area of the remolding steel barrel 3, and the upper porous water-permeable steel pad 10 and the upper fiber filter screen 9 can move up and down along the inner wall of the remolding steel barrel 3 in the remolding steel barrel 3;
the signal input end of the transmission rod 11 abuts against the upper porous water-permeable steel pad 10, a space between the upper fiber filter screen 9 and the lower fiber filter screen 7 is filled with weakly cemented rock particle adhesive bodies, and the lower surface of the lower porous water-permeable steel pad 6 is communicated with the base drainage plate through fluid. When the reaction frame device is installed, vaseline is smeared in the remolded steel barrel 3 and then the remolded steel barrel is placed on the base drain board 4, and the lower porous permeable steel pad 6 and the lower fiber filter screen 7 are sequentially and uniformly placed at the bottom of the inner cavity of the remolded steel barrel 3; after the remolding steel barrel 3 is filled with the weakly cemented rock particle adhesive, the fiber filter screen 9 and the porous permeable steel pad 10 are uniformly arranged on the top of the weakly cemented rock particle adhesive.
In the step (2) and the step (3), the inner diameter of the remolded steel barrel is 50mm, and the height of the remolded steel barrel is 200 mm; in step (4), the diameter of the remolded weakly cemented rock sample is 50mm, the height is 100mm, and the flatness of the two ends of the cylindrical sample is ensured. And (3) pressurizing the weakly cemented rock particle adhesive in a grading manner by using an air compressor, moving the counter-force cover plate downwards, driving the transmission rod to move downwards, and simultaneously controlling the pressure according to the reading of a pressure control meter, wherein the pressure loading time of each stage lasts for 12h until a pressure loading plate in the compaction module is lower than the top of the upper porous permeable steel pad or the reading of a pressure gauge shows that the loading pressure is not less than 12 MPa.
As shown in fig. 3, in step (3), the R value is measured with a uniaxial compression test apparatus comprising a control system 13, a data collector 14, a control cabinet 18 and a rock uniaxial servo press 36; the signal input end of the control system 13 is connected with the signal output end of the data acquisition instrument 14, the signal input end of the data acquisition instrument 14 is connected with the signal output end of the rock uniaxial servo press 36, and the signal input end of the rock uniaxial servo press 36 is connected with the signal input end and the signal output end of the control cabinet 18;
in step (3), the remolded weakly cemented rock sample 16 is placed on the cushion block 17 of the rock uniaxial servo press 36, and the pressure head 15 of the rock uniaxial servo press 36 is positioned right above the remolded weakly cemented rock sample 16. Uniaxial compression test was carried out according to the test protocol for rock physical mechanical properties (DZ/T0276.1-2015) to obtain uniaxial compression strength values R of the remolded specimens.
In the step (3), applying pressure in a grading pressurization mode, wherein the loading duration of each grade of pressure is 12h, the pressure is applied in 3 grades in total, the pressure applied from the first grade to the third grade is 4MPa, 8MPa and 12MPa in sequence, and when the loading pressure of the third grade is more than or equal to 12MPa, the pressure application is finished; in the step (6), the pressure is applied in a manner of carrying out stepped pressurization in 3 grades, the pressure applied from the first stage to the third stage is 4MPa, 8MPa and 12MPa in sequence, the loading duration of each stage of pressure is 24h, and the pressure application is finished when the loading pressure of the third stage is greater than or equal to 12 MPa. During pressurization, if the loading is directly carried out with the maximum pressure, the internal structure of the rock sample is easy to generate an uneven arch-shaped microstructure, the drainage effect of the rock sample is poor, the rock sample is not easy to compact, and the defects can be avoided by adopting the mode for carrying out graded pressurization.
As shown in fig. 4 and 5, in step (6), the remolded rock sample steel mold 31 includes an upper steel plate 23, a lower steel plate 24, a first wide-side steel plate 26, a second wide-side steel plate 27, a first long-side steel plate 28, and a second long-side steel plate 25; the upper steel plate 23 and the lower steel plate 24 are parallel to each other, the first wide side steel plate 26 and the second wide side steel plate 27 are parallel to each other, and the first long side steel plate 28 and the second long side steel plate 25 are parallel to each other; the first wide side steel plate 26, the second wide side steel plate 27, the first long side steel plate 28 and the second long side steel plate 25 are fixedly connected with each other through bolts to form a long square frame; the lower steel plate 24 is provided with a rectangular groove 20, the rectangular groove 20 is matched with a rectangle defined by the wall bottom of the long square frame, and the long square frame is fixedly arranged on the lower steel plate 24 through the rectangular groove 20; the length of the upper steel plate 23 is less than or equal to the distance between the inner wall of the first wide side steel plate 26 and the inner wall of the second wide side steel plate 27, and the width of the upper steel plate 23 is less than or equal to the distance between the inner wall of the first long side steel plate 28 and the inner wall of the second long side steel plate 25; the lower steel plate 24 is provided with a drain hole 21, and both ends of the upper steel plate 23 are provided with upper steel plate lifting points 22;
an upper porous water-permeable steel pad 10, an upper fiber filter screen 9, a lower fiber filter screen 7 and a lower porous water-permeable steel pad 6 are detachably arranged in the remolded rock sample steel die 31 from top to bottom in sequence, and the cross sections of the upper porous water-permeable steel pad 10, the upper fiber filter screen 9, the lower fiber filter screen 7 and the lower porous water-permeable steel pad 6 are parallel to each other and are vertical to the central axis of the remolded steel barrel 3; the lower surface of the upper porous water-permeable steel pad 10 is in close contact with the upper surface of the upper fiber filter screen 9, and the lower surface of the lower fiber filter screen 7 is in close contact with the upper surface of the lower porous water-permeable steel pad 6; the upper porous permeable steel pad 10 and the upper fiber filter screen 9 are in clearance fit with the inner wall of the remolded rock sample steel mold 31, the cross sectional areas of the upper porous permeable steel pad 10, the upper fiber filter screen 9, the lower fiber filter screen 7 and the lower porous permeable steel pad 6 are all smaller than or equal to the cross sectional area of the remolded rock sample steel mold 31, and the upper porous permeable steel pad 10 and the upper fiber filter screen 9 can move up and down along the inner wall of the remolded rock sample steel mold 31 in the remolded rock sample steel mold 31;
the space between the upper fiber filter screen 9 and the lower fiber filter screen 7 is filled with weakly cemented rock particle adhesive, a pressure sensor 29 is arranged in the weakly cemented rock particle adhesive 37, and a signal output end of the pressure sensor 29 extends out of the remolded rock sample steel mold 31 through a sensor data line 30; the lower surface of the lower porous permeable steel pad 6 is in fluid communication with the drain holes 21 on the lower steel plate 24. And the pressure sensor is used for monitoring pressure data of the weakly cemented rock in the process of the compaction of the sticky body and pressure data of the subsequent hob rock breaking test.
The length of the inner cavity of the remolded rock sample steel die 31 is 1500mm, the width is 500mm, and the height is 400 mm; the thicknesses of the first wide side steel plate 26, the second wide side steel plate 27, the first long side steel plate 28 and the second long side steel plate 25 are all 80 mm; the depth of the rectangular groove 20 is 30mm, the number of the drain holes 21 on the lower steel plate 24 is 3, and the thickness of the lower steel plate 24 is 100 mm.
As shown in fig. 6, in step (7), a multifunctional compaction test bed is adopted to apply pressure to the remolded rock sample steel mould in a grading manner for compaction and consolidation, wherein the multifunctional compaction test bed comprises vertical supporting legs 32, a loading cross beam 33, a loading oil cylinder 34 and a loading cover plate 35; two vertical supporting legs 32 are arranged, the two vertical supporting legs 32 are symmetrically arranged at two ends of the table top of the multifunctional compaction test table, longitudinal sliding grooves are formed in the two vertical supporting legs 32, and the longitudinal sliding grooves at two ends of the loading cross beam 33 are respectively connected with the two vertical supporting legs 32 in a sliding mode; one end of the loading oil cylinder 34 is fixedly connected with the bottom surface of the loading cross beam 33 through a connecting piece, and the other end of the loading oil cylinder 34 is fixedly connected with the upper surface of the loading cover plate 35 through a connecting piece; the lower surface of the loading cover plate 35 abuts against the upper steel plate 23 of the remolded rock sample steel mould 31.
After compaction and consolidation are completed, the mould is transferred from the multifunctional test bed to a full-size hob rock breaking test bed by using a crane, an upper steel plate, an upper porous permeable steel pad and an upper fiber filter screen which cover the upper part of the sample are taken down, and the hob breaking large-volume remolding weak cemented rock mass test can be directly carried out without dismantling the steel plates around the steel mould.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.
Claims (10)
1. A preparation method for remolding a large-volume rock sample in a drilling method sinking hob breaking weak cemented rock test is characterized by comprising the following steps:
(1) mechanically crushing original weak cemented rock blocks with different sizes of fractured block sizes on the engineering site to obtain rock particles; adding water into the rock particles and stirring to obtain weakly cemented rock particle adherends; measuring the average value of the uniaxial compressive strength of the undisturbed weakly cemented rock and recording as R0；
(2) Installing a reaction frame device, pouring the weakly cemented rock particle adhesive into a remolding steel barrel of the reaction frame device in a layered manner, and performing primary vibration on each layer by adopting a compaction hammer until the weakly cemented rock particle adhesive is compacted;
(3) applying pressure to the weakly cemented rock particle adherends in the remolding steel barrel for compaction and consolidation, so that the weakly cemented rock particle adherends form remolded weakly cemented rock cylinders in the remolding steel barrel;
(4) cutting the remolded weakly cemented rock cylinder to obtain a remolded weakly cemented rock sample, and measuring the uniaxial compressive strength value of the remolded weakly cemented rock sample and recording as R;
(5) comparison of R0And the value of R, according to R0Adjusting the doping ratio of water in the step (1) and the value of the consolidation pressure parameter in the step (3) by the difference value between the R and the R, and repeating the steps (1) to (4) until the R is more than or equal to the R0(ii) a At this time, the mass ratio of water to rock particles in step (1) is recorded as X, and the final consolidation pressure value applied in step (3) is recorded as M0；
(6) Manufacturing and installing a remolded rock sample steel mold, then preparing the weakly cemented rock particle adhesive body according to the method in the step (1) with the mass ratio of water to rock particles being X, and loading the weakly cemented rock particle adhesive body into the remolded rock sample steel mold in layers, wherein each layer is subjected to primary vibration by adopting a compaction hammer until the weakly cemented rock particle adhesive body is compacted;
(7) after the remolded rock sample steel mould is filled with the weakly cemented rock particle adhesive, applying pressure to the remolded rock sample steel mould in a grading manner for compaction and consolidation, wherein the pressure applied during compaction and consolidation is greater than or equal to the consolidation pressure value M obtained in the step (5)0(ii) a And compacting and consolidating to obtain the remolded weakly consolidated large-volume rock sample.
2. The preparation method for testing and remolding the large-volume rock sample by crushing the weakly consolidated rock with the drilling and sinking hob according to the claim 1, wherein in the step (1), the particle size of the rock particles is 0-10 mm; in the step (2), the thickness of the weakly cemented rock particle paste filled in each layer is 1/5 of the height of the remodeling steel barrel; in step (6), the thickness of the weakly cemented rock particle paste filled in each layer is 1/4 of the height of the remolded rock sample steel mould.
3. The preparation method for remodeling large-volume rock sample by the well drilling and sinking hob crushing weak cemented rock test according to the claim 1, wherein in the step (2), the reaction frame device comprises a reaction frame cover plate (12), a base drain plate (4), a remodeling steel barrel (3), an air compressor case (5) and a pressure control meter (1); the reaction frame cover plate (12) is arranged above the upper surface of the air compressor case (5) through a telescopic upright post (2), a transmission rod (11) is fixedly arranged on the lower surface of the reaction frame cover plate (12), and the transmission rod (11) is vertical to the lower surface of the reaction frame cover plate (12); the base drainage plate (4) is fixedly arranged on the upper surface of the air compressor case (5) and is positioned right below the reaction frame cover plate (12); the pressure control meter (1) is fixedly arranged on the upper surface of the reaction frame cover plate (12), and a signal input end of the pressure control meter (1) penetrates through the reaction frame cover plate (12) to be connected with a signal output end of the transmission rod (11); the signal input end of the transmission rod (11) extends into the remolding steel barrel (3) from the top of the remolding steel barrel (3), a pressure sensor is arranged between the end surface of the transmission rod (11) and the weakly cemented rock particle adhesive body, and the pressure sensor is electrically connected with the signal input end of the transmission rod (11); the bottom of the remolding steel barrel (3) is fixedly arranged on the upper surface of the base drainage plate (4); and a compressor controller (8) is arranged on the air compressor case (5).
4. The preparation method for remolding large-volume rock samples in the test of breaking weakly cemented rock by using a drilling sinking hob according to claim 3, characterized in that a porous permeable steel pad (10), an upper fiber filter screen (9), a weakly cemented rock particle binder (37), a lower fiber filter screen (7) and a lower porous permeable steel pad (6) are detachably arranged in the remolding steel barrel (3) from top to bottom in sequence, and the cross sections of the upper porous permeable steel pad (10), the upper fiber filter screen (9), the lower fiber filter screen (7) and the lower porous permeable steel pad (6) are parallel to each other and are vertical to the central axis of the remolding steel barrel (3); the lower surface of the upper porous water-permeable steel pad (10) is in close contact with the upper surface of the upper fiber filter screen (9), and the lower surface of the lower fiber filter screen (7) is in close contact with the upper surface of the lower porous water-permeable steel pad (6); the cross sectional areas of the upper porous water-permeable steel pad (10), the upper fiber filter screen (9), the lower fiber filter screen (7) and the lower porous water-permeable steel pad (6) are all smaller than or equal to the cross sectional area of the remolded steel barrel (3), and the upper porous water-permeable steel pad (10) and the upper fiber filter screen (9) can move up and down along the inner wall of the remolded steel barrel (3) in the remolded steel barrel (3);
the signal input end of the transmission rod (11) abuts against the upper porous water-permeable steel pad (10), the space between the upper fiber filter screen (9) and the lower fiber filter screen (7) is filled with the weakly cemented rock particle adhesive body (37), and the lower surface of the lower porous water-permeable steel pad (6) is communicated with the base drainage plate through fluid.
5. The preparation method for testing and remolding large-volume rock samples by using the drilling sinking hob to crush the weakly consolidated rock is characterized in that in the step (2) and the step (3), the remolding steel barrel (3) has an inner diameter of 50mm and a height of 200 mm; in step (4), the diameter of the remolded weakly cemented rock sample is 50mm, and the height is 100 mm.
6. The method for preparing a remolded rock sample for the test of breaking weakly consolidated rock by using a drilling sinking hob according to claim 1, characterized in that in the step (3), an R value is measured by using a uniaxial compression test device, wherein the uniaxial compression test device comprises a control system (13), a data acquisition instrument (14), a control cabinet (18) and a rock uniaxial servo press (36); the signal input end of the control system (13) is connected with the signal output end of the data acquisition instrument (14), the signal input end of the data acquisition instrument (14) is connected with the signal output end of the rock uniaxial servo press (36), and the signal input end of the rock uniaxial servo press (36) is connected with the signal input and output end of the control cabinet (18);
in the step (3), the remolded weakly cemented rock sample (16) is placed on a cushion block (17) of the rock uniaxial servo press (36), and a pressure head (15) of the rock uniaxial servo press (36) is positioned right above the remolded weakly cemented rock sample (16).
7. The preparation method for remodeling large-volume rock sample in the test of breaking weakly consolidated rock by using a drilling sinking hob as claimed in claim 1, wherein in the step (3), the pressure is applied in a graded pressurizing manner, the loading duration of each grade of pressure is 12h, the pressurizing is carried out in 3 grades in total, the applying pressure from the first grade to the third grade is 4MPa, 8MPa and 12MPa in sequence, when the third grade loading pressure is greater than or equal to 12MPa, the applying pressure is finished, and the third grade applying pressure of 12MPa is M0(ii) a In the step (6), the pressure application mode is also classified into 3 grades for pressurization, and the pressure application from the first grade to the third grade is 1/3M0 MPa、2/3M0MPa and M0MPa, the loading duration of each stage of pressure is 24h, and when the third stage loading pressure is more than or equal to M0And when the pressure is MPa, ending the pressure application.
8. The preparation method for testing and remolding a large-volume rock sample by using a drilling sinking hob to crush the weakly consolidated rock is characterized in that in the step (6), the remolded rock sample steel die (31) comprises an upper steel plate (23), a lower steel plate (24), a first wide side steel plate (26), a second wide side steel plate (27), a first long side steel plate (28) and a second long side steel plate (25); the upper steel plate (23) and the lower steel plate (24) are parallel to each other, the first wide-sided steel plate (26) and the second wide-sided steel plate (27) are parallel to each other, and the first long-sided steel plate (28) and the second long-sided steel plate (25) are parallel to each other; the first wide side steel plate (26), the second wide side steel plate (27), the first long side steel plate (28) and the second long side steel plate (25) are fixedly connected with each other through bolts to form a long square frame; the lower steel plate (24) is provided with a rectangular groove (20), the rectangular groove (20) is matched with a rectangle defined by the wall bottom of the long square frame, and the long square frame is fixedly arranged on the lower steel plate (24) through the rectangular groove (20); the length of the upper steel plate (23) is less than or equal to the distance between the inner wall of the first wide side steel plate (26) and the inner wall of the second wide side steel plate (27), and the width of the upper steel plate (23) is less than or equal to the distance between the inner wall of the first long side steel plate (28) and the inner wall of the second long side steel plate (25); the lower steel plate (24) is provided with a drain hole (21), and two ends of the upper steel plate (23) are provided with upper steel plate lifting points (22);
an upper porous water-permeable steel pad (10), an upper fiber filter screen (9), a weakly cemented rock particle sticky body (37), a lower fiber filter screen (7) and a lower porous water-permeable steel pad (6) are detachably arranged in the remolded rock sample steel die (31) from top to bottom in sequence, and the cross sections of the upper porous water-permeable steel pad (10), the upper fiber filter screen (9), the lower fiber filter screen (7) and the lower porous water-permeable steel pad (6) are parallel to each other and are vertical to the central axis of the remolded steel barrel (3); the lower surface of the upper porous water-permeable steel pad (10) is in close contact with the upper surface of the upper fiber filter screen (9), and the lower surface of the lower fiber filter screen (7) is in close contact with the upper surface of the lower porous water-permeable steel pad (6); the cross sectional areas of the upper porous water-permeable steel pad (10), the upper fiber filter screen (9), the lower fiber filter screen (7) and the lower porous water-permeable steel pad (6) are all smaller than or equal to the cross sectional area of the remolded rock sample steel mold (31), and the upper porous water-permeable steel pad (10) and the upper fiber filter screen (9) can move up and down along the inner wall of the remolded rock sample steel mold (31) in the remolded rock sample steel mold (31);
a space between the upper fiber filter screen (9) and the lower fiber filter screen (7) is filled with a weakly cemented rock particle bonding body (37), a pressure sensor (29) is arranged in the weakly cemented rock particle bonding body (37), and a signal output end of the pressure sensor (29) extends out of the remolded rock sample steel mold (31) through a sensor data line (30); the lower surface of the lower porous permeable steel pad (6) is in fluid communication with the drain holes (21) on the lower steel plate (24).
9. The preparation method for remolded rock samples with large volume in the test of breaking weakly consolidated rock by using the drilling sinking hob as the claim 8, characterized in that the length of the inner cavity of the remolded rock sample steel die (31) is 1500mm, the width is 500mm, and the height is 400 mm; the thicknesses of the first wide side steel plate (26), the second wide side steel plate (27), the first long side steel plate (28) and the second long side steel plate (25) are all 80 mm; the depth of the rectangular groove (20) is 30mm, the number of the drain holes (21) on the lower steel plate (24) is 3, and the thickness of the lower steel plate (24) is 100 mm.
10. The preparation method for remolding large-volume rock samples through the well drilling and sinking hob breaking weak bond rock test according to the claim 1, characterized in that in the step (7), a multifunctional compaction test bed is adopted to apply pressure to the remolded rock sample steel mould in a grading manner for compaction and consolidation, and the multifunctional compaction test bed comprises vertical supporting legs (32), a loading cross beam (33), a loading oil cylinder (34) and a loading cover plate (35); the number of the vertical supporting legs (32) is two, the two vertical supporting legs (32) are symmetrically installed at two ends of the table top of the multifunctional compaction test table, longitudinal sliding grooves are formed in the two vertical supporting legs (32), and two ends of the loading cross beam (33) are respectively in sliding connection with the two vertical supporting legs (32) through the longitudinal sliding grooves; one end of the loading oil cylinder (34) is fixedly connected with the bottom surface of the loading cross beam (33) through a connecting piece, and the other end of the loading oil cylinder (34) is fixedly connected with the upper surface of the loading cover plate (35) through a connecting piece; and the lower surface of the loading cover plate (35) abuts against an upper steel plate (23) of the remolded rock sample steel mould (31).
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