GB2619605A - Device and method for testing uniaxial compressive strength of undisturbed soft rock - Google Patents

Device and method for testing uniaxial compressive strength of undisturbed soft rock Download PDF

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Publication number
GB2619605A
GB2619605A GB2306225.0A GB202306225A GB2619605A GB 2619605 A GB2619605 A GB 2619605A GB 202306225 A GB202306225 A GB 202306225A GB 2619605 A GB2619605 A GB 2619605A
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GB
United Kingdom
Prior art keywords
penetration
needle
compressive strength
uniaxial compressive
soft rock
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Pending
Application number
GB2306225.0A
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GB202306225D0 (en
Inventor
Bai Xiaoyu
Zhang Li
Wang Xueling
Zhang Yamei
Yan Nan
Chen Jiguang
Zhang Changtai
Yin Jichao
Xu Zeqiang
Sun Gan
Wang Fengjiao
Diao Haojie
Mi Jinwei
Wu Zekun
Su Hang
Hao Zengming
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Qingdao University of Technology
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Qingdao University of Technology
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Publication date
Application filed by Qingdao University of Technology filed Critical Qingdao University of Technology
Publication of GB202306225D0 publication Critical patent/GB202306225D0/en
Publication of GB2619605A publication Critical patent/GB2619605A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/40—Investigating hardness or rebound hardness
    • G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0041—Human or animal power
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0076—Hardness, compressibility or resistance to crushing
    • G01N2203/0078—Hardness, compressibility or resistance to crushing using indentation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/025—Geometry of the test
    • G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration

Abstract

A device for testing uniaxial compressive strength of an undisturbed soft rock sample 10 comprises; a force gauge 1, a point-cone joint 5, and a penetration needle 7 detachably connected to the point-cone joint. A bottom of the force gauge is provided with a moveable connecting rod 4, a bottom of the connecting rod is detachably connected to a top of the point-cone joint 5, and a bottom of the point-cone joint has a pointed structure with mounting hole for the needle. The cone joint allows a clear line of sight such that the needle can be accurately positioned on a measurement point on the rock sample and the sample is not damaged by multiple insertions. A method of using the device includes pressing the needle into the rock sample and calculating a needle penetration ratio to obtain uniaxial compressive strength.

Description

DEVICE AND METHOD FOR TESTING UNIAXIAL COMPRESSIVE STRENGTH
OF UNDISTURBED SOFT ROCK
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of geotechnical engineering, and in particular to a device and method for testing uniaxial compressive strength of an undisturbed soft rock
BACKGROUND
[0002] The descriptions herein only provide background information about the present disclosure, and do not necessarily constitute prior art.
[0003] Uniaxial compressive strength is an important index to reflect die classification and characteristics of rock mass. General uniaxial compressive strength test generally requires the preparation of high-quality standard rock specimens and measurement by relevant large equipment, while for soft rocks with high weathering degree and difficulty to be made into standard rock specimens, or natural and man-made historical rock structures, relics, buildings and others that are not allowed to be drilled by drilling machines, needle penetrometer is generally used for uniaxial compressive strength detection.
[0004] The inventor found that it is particularly important to test the uniaxial compressive strength on a micro-unit area due to remarkable heterogeneity of soft rocks. However, the existing needle penetrometer is not easy to determine the location of penetration point accurately due to large presser size, which may lead to the deviation of the measuring point. Moreover, as die contact area at the bottom of the needle penetrometer is too large, local damage may be caused to the soft rock around the measuring point during every point measurement, which limits the spacing and the number of measuring points, and is not conducive to the reduction of discrete and uneven strength values. In addition, the existing penetrometer is easily influenced by the surface flatness of rock samples.
SUMMARY
[0005] For the shortcomings in the prior art, an objective of the present disclosure is to provide a device and method for testing uniaxial compressive strength of an undisturbed soft rock. A point-cone joint for mounting a penetration needle is provided at a bottom of a force gauge, and thus the soft rock around a measuring point of a rock sample cannot be damaged in a large range, a spacing between the measuring points can be greatly shortened, and the number of measuring points per unit area is increased. The accuracy and testing precision of the penetration point can be guaranteed, and the penetration resistance and penetration depth of the needle in the process of penetrating into the undisturbed soft rock can be effectively recorded for the obtaining of the uniaxial compressive strength of the undisturbed soft rock, thus an initial and damage state of the undisturbed soft rock is revealed, and the problem of low measurement precision of the existing needle penetrometer is effectively solved.
[0006] To achieve the objective above, the present disclosure is achieved through the following technical solution: [0007] In a first aspect, a device for testing uniaxial compressive strength of an undisturbed soft rock is provided, including a force gauge, a point-cone joint, and a penetration needle detachably connected to the point-cone joint. A bottom of the force gauge is movably provided with a connecting rod, a bottom of the connecting rod is detachably connected to a top of the point-cone joint, and a bottom of the point-cone joint is of a pointed structure.
[0008] As a further implementation mode, the point-cone joint is composed of a cylindrical connecting part and a conical mounting part. The mounting part is fixedly arranged at a bottom of the connecting part, a bottom of the mounting part is of a pointed structure, and a top of the connecting part is detachably connected to a connecting rod.
[0009] As a further implementation mode, a mounting hole is axially drilled at the center of a cone vertex at the bottom of the mounting part, and the penetration needle is in clearance fit with the mounting hole.
[0010] As a further implementation mode, a depth of the mounting hole is less than a length of the penetration needle.
[0011] As a further implementation mode, the mounting hole, the penetration needle and the connecting rod are coaxially provided.
[0012] As a further implementation mode, a gauge body of the force gauge is provided with a display and a peak knob. The peak knob can be used to lock peak force measurement by rotation, and a reading on the display is returned to zero by pressing the peak knob.
[0013] In a second aspect, a method for testing uniaxial compressive strength of an undisturbed soft rock is provided, which uses the device for testing uniaxial compressive strength of an undisturbed soft rock and includes specific steps as follows: [0014] assembling a test device; [0015] determining the position and number of measuring points of the undisturbed soft rock; [0016] rotating a peak knob to lock a peak stress, holding a penetration needle with a hand and vertically pointing a tip of the penetration needle to one measuring point, removing the hand on the penetration needle, and pressing the device downwards by applying a force, thus penetrating the penetration needle into soil; [0017] when a needle penetration hole on a rock sample is about to break or crack, stopping applying force, separating the penetration needle from a mounting hole, and measuring a penetration depth of the penetration needle; and [0018] calculating a needle penetration ratio, and obtaining uniaxial compressive strength according to the needle penetration ratio.
[0019] As a thither implementation mode, the peak knob needs to be pressed for zeroing prior to every force application.
[0020] As a further implementation mode, multiple penetration needles need to be prepared. [0021] As a thither implementation mode, the uniaxial compressive strength is obtained by performing conversion according to a relationship diagram of the calculated needle penetration ratio and uniaxial compressive strength; [0022] or, is obtained by needle penetration ratio calculation.
[0023] The present disclosure has the beneficial effects as follows: [0024] (1) A bottom of a force gauge is provided with a point-cone joint for mounting a penetration needle, and a bottom of the point-cone joint is of a pointed structure, thus the line of sight cannot be blocked, the accurate positioning of a measuring point is ensured, the soft rock around the measuring point of a rock sample cannot be damaged in a large range, a spacing between the measuring points can be greatly shortened, the number of measuring points per unit area is increased, the dispersion and unevenness of strength values can be effectively reduced, the true strength change of the cross section can be reflected more tally, and the accuracy of a measuring structure is ensured.
[0025] (2) The device for testing uniaxial compressive strength of an undisturbed soft rock does not involve supporting parts, and an operator can carry out a penetration test on the measuring point only with hand, which is not affected by the surface of the rock sample, and is simple to operate, thus greatly improving the test efficiency and accuracy.
[0026] (3) Two methods for obtaining uniaxial compressive strength of the rock sample are disclosed by the present disclosure, the uniaxial compressive strength of the rock can be converted or calculated by using a needle penetration ratio, and thus the measurement precision of the uniaxial compressive strength of the rock sample is greatly guaranteed.
[0027] (4) As the device for testing uniaxial compressive strength of the undisturbed soft rock is not affected by the surface flatness of the sample, the device has strong adaptability, no sample preparation is required for the testing, and thus time and use cost are greatly saved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The accompanying drawings, which form a part of the present disclosure, are used to provide a further understanding of the present disclosure. The exemplary embodiments and descriptions thereof in the present disclosure are used to explain the present disclosure and not to limit the present application in any improper way.
[0029] FIG. I is a schematic structural diagram of a device for testing uniaxial compressive strength of an undisturbed soft rock according to one or more embodiments of the present disclosure in a use state; [0030] FIG. 2 is a schematic structural diagram of a point-cone joint according to one or more embodiments of the present disclosure connected to a penetration needle: [0031] FIG. 3 is a schematic structural diagram of a point-cone joint according to one or more embodiments of the present disclosure separated from a penetration needle; [0032] FIG. 4 is a schematic diagram of a connection mode of a point-cone joint and a force gauge according to one or more embodiments of the present disclosure; [0033] FIG. 5 is a relationship diagram of a needle penetration ratio and uniaxial compressive strength according to one or more embodiments of the present disclosure; [0034] FIG. 6 is a schematic diagram of a uniaxial compressive strength test result according to one or more embodiments of the present disclosure.
[0035] In the drawings: the spacing or dimensions are exaggerated to show the location of each part, and the schematic diagrams are for schematic purposes only: [0036] 1-force gauge; 2-display; 3-peak knob; 4-connecting rod; 5-point-cone joint; 6-mounting hole; 7-penetration needle; 8-external thread; 9-intemal thread; 10-undisturbed soft rock.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0037] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by those of ordinary skill in the art.
[0038] As introduced in the background art, the existing needle penetrometer is not easy to determine the location of a penetration point accurately due to a large presser size, which may lead to the deviation of the measuring point, and as the contact area at the bottom of the needle penetrometer is too large, local damage may be caused to the soft rock around the measuring point during every point measurement, which limits the spacing and the number of measuring points, and is not conducive to the reduction of discrete and uneven strength values. In addition, the existing penetrometer is easily affected by the surface flatness of a rock sample. in order to solve the technical problem above, a device and method for uniaxial compressive strength of an undisturbed soft rock are provided in accordance with the present disclosure.
[0039] Embodiment I [0040] In a typical embodiment of the present disclosure, as shown in FIG. 1 through FIG. 4, a device for testing unia,xial compressive strength of an undisturbed soft rock is provided, including a force gauge 1, a point-cone joint 5 detachably connected to the force gauge I, arid a penetration needle 7 detachably connected to the point-cone joint 5.
[0041] As shown in FIG. 4, a display 2 and a peak knob 3 are arranged on a gauge body of the force gauge 1, a connecting rod 4 is movably provided at a bottom of the force gauge 1, and the force gauge 1 is detachably connected to the point-cone joint 5 by the connecting rod 4.
[0042] During the penetration of the penetration needle 7, the point-conc joint 5 can push the connecting rod 4 to move in an axial direction, and then a push-pull force value is displayed through the display 2. The peak knob 3 can be rotated to lock peak force measurement, and a reading on the display 2 can be returned to zero by pressing the peak knob 3.
[0043] The display 2 may be an electronic display for directly displaying a measured value of the pull-push force, or may be a pointer dial structure for displaying a measured value of the push-pull force through the rotation of a pointer. When the pointer dial stmcture is employed, its minimum scale cannot be greater than 2.5 N to ensure the accuracy of the measurement. The specific structure can be set according to design requirements, as long as the display of the measured value can be guaranteed, and there are no excessive limitations here.
[0044] It can be understood that the force gauge 1 is an existing instrument, which can measure a push-pull force value by pushing and pulling the connecting rod 4, and has the functions of temporarily and fixedly displaying the value and returning to zero after measurement, and the specific internal structure is not described in detail here.
[0045] A bottom of the force gauge 1 is provided with a connecting rod 4 capable of moving in an axial direction, the connecting rod 4 is vertically arranged, and a bottom of the connecting rod 4 is provided with external threads 8 so as to be detachably cornice-Mc' to the point-cone joints. [0046] As shown in FIG. 2, the point-cone joint 5 is composed of a cylindrical connecting part and a conical mounting part, a diameter of the connecting part is the same as that of the mounting part, and the mounting part is fixedly arranged at the bottom of the connecting part.
Internal threads 9 are arranged at the top center of the connecting part, and the connecting part is detachably connected to the connecting rod 4 through the thread fit of the internal threads 9 and the external threads 8.
[0047] The bottom of the connecting part is fixedly connected to the conical mounting part, a bottom of the mounting part is of a sharp pointed structure, and the bottom of the mounting part is provided with a mounting hole 6. Specifically, the center of a cone vertex of the mounting part is axially drilled to form the mounting hole 6 for mounting the penetration needle 7.
[0048] The mounting hole 6 is free of communicating with an internal threaded hole, a depth of the mounting hole 6 is less than a length of the penetration needle 7, and a diameter of the mounting hole 6 is slightly larger than a diameter of the penetration needle 7, thus making the mounting hole 6 in clearance fit with penetration needle 7 to avoid penetration needle 7 from deviating from the axis after being installed in place.
[0049] The penetration needle 7 is an original penetration needle of the needle penetrometer, with a length of 40 mm and an end diameter of 0.84 mm. At this time, the mounting hole 6 has a diameter of 0.9 mm and a hole depth of 10 mm. Prior to penetration for measurement, the end of the penetration needle 7 can be embedded into the mounting hole 6 without loosening. After penetration for measurement, the penetration needle 7 may be separated from the mounting hole 6.
[0050] It may be understood that the mounting hole 6 and the penetration needle 7 may be of other sizes, as long as the penetration needle 7 is ensured to be not completely inserted into the mounting hole 6, and the penetration needle 7 is not deviated from the axis after being installed in place and can be effectively separated from the mounting hole 6.
[0051] It should be noted that the connecting rod 4, the mounting hole 6 and the penetration needle 7 need to be provided coaxially, so as to ensure the accuracy of the measuring points and force measurements.
[0052] Due to the arrangement of a pointed structure at the bottom of the point-cone joint 5, the line of sight cannot be blocked, the accurate positioning of the measuring point is ensured, the soft rock around the measuring point of the rock sample cannot be damaged in a large range, a spacing between the measuring points can be greatly shortened, the number of measuring points per unit area is increased, the dispersion and unevenness of the strength value can be effectively reduced, the true strength change of the cross section can be reflected more truly, and the accuracy of the measuring structure is ensured.
[0053] The device for testing uniaxial compressive strength of the undisturbed soft rock does not involve supporting parts, and an operator can carry out a penetration test on the measuring point only with hand, which is not affected by the surface of the rock sample, and is simple to operate, thus greatly improving the test efficiency and accuracy.
[0054] Embodiment 2 [0055] In another typical embodiment of the present disclosure, a method for testing uniaxial compressive strength of an undisturbed soft rock is provided as follows: [0056] Step 1: A test device is assembled, a hole is drilled in the center of a cone vertex of a point-cone joint 5, with a hole diameter of 0.9 mm, and a hole depth of 10 mm, that is, a mounting hole 6 for a penetration needle, and the perpendicularity of drilling should be strictly guaranteed. Internal threads 9 of the point-cone joint 5 and external threads 8 on a connecting rod 4 at a bottom of a force gauge I are screwed tight and fixed.
[0057] Step 2: Multiple penetration needles 7 are prepared, the penetration needles 7 are original penetration needles of Needle Penetrometer(SH-70) in Japan, with a needle length of 40 mm and an end diameter of 0.84 mm. Prior to the test, the end of the penetration needle 7 is embedded into the mounting hole 6, that is. the assembly of the device for testing the uniaxial compressive strength of the undisturbed soft rock is completed.
[0058] Step 3: The position and number of measuring points of the undisturbed soft rock 10 are determined, a rock sample (core sample drilled by a geological drilling rig) obtained after an indoor simulation test of dynamic piling in undisturbed mudstonc is the undisturbed soft rock 10, the shape and size of which are not limited. In this embodiment, an intact rock sample has a diameter of 90 inin and a height of 200 mm.
[0059] It should be noted that when field tests are carried out no sampling is required, and at this time, any area can be used as the undisturbed soft rock 10.
[0060] Step 4: A peak knob 3 on the force gauge I is rotated to a "PEAK" mode to lock a PEAK stress.
[0061] Step 5. A tip of the penetration needle 7 of the test device is enabled to point vertically to the measuring point, the tip should avoid damaging the surface of the rock sample when making contact with the surface of the measuring point of the undisturbed soft rock 10 (at this time, the penetration needle 7 must be held with a hand to prevent the penetration needle 7 from separating from the point-cone joint 5), and the peak knob 3 is pressed to make a reading on a display 2 return to zero.
[0062] The device is pressed downwards by applying a force, and a whole consisting of the point-cone joint 5 and the penetration needle 7 moves synchronously, thus making the penetration needle 7 penetrate into the soil and start measurement.
[0063] It should be noted that prior to force application, the hand holding the penetration needle 7 needs to be removed, otherwise the measurement result may be affected. In a case that the perpendicularity of the penetration needle 7 needs to be adjusted, the peak knob 3 is pressed again for zeroing after the penetration needle is adjusted in place, and then the force can be applied again.
[0064] Step 6: During measurement, force application is stopped when a hole, penetrated by the penetration needle 7, on the rock sample (that is, a needle penetration hole on the rock sample) is about to break or crack, the penetration needle 7 is separated from the mounting hole 6, the penetration needle 7 is left in the undisturbed soft rock 10 to be measured, and a penetration depth of the penetration needle 7 is measured immediately.
[0065] A measurement mode is as follows: a length of the penetration needle 7 that does not penetrate into the rock sample is measured with a ruler, the length of the part that does not penetrate into the rock sample is subtracted from the needle length of the penetration needle 7 to obtain a penetration depth (mm), and then the penetration depth is recorded. Meanwhile, a value on the display 2 is recorded as penetration resistance (N), all the measuring points are measured one by one, and the data are recorded.
[0066] It should be noted that in order to eliminate an error, an average value of two to three measurement results should be taken as the final measurement result during measurement, and a distance from the measuring point to an edge of the undisturbed soft rock 10 should be greater than 1 mm, and a distance between the measuring points should be greater than 10 mm, thus preventing the rock sample damage from affecting the measurement result.
[0067] In a case that the measured undisturbed soft rock 10 is high in hardness, when a penetration depth of the penetration needle 7 in the soil reaches 10 mm or the penetration resistance reaches 50 N (here is the maximum range of the force gauge in this embodiment, which may be other values in other embodiments), the measurement should be stopped immediately, and the penetration resistance and penetration length should be recorded. in a case that a radioactive damage area is formed due to the formation of cracks at the measuring point during penetration, this measurement result should be discarded.
[0068] Step 7: A needle penetration ratio is calculated, and the uniaxial compressive strength is converted or calculated according to the needle penetration ratio.
[0069] Specifically, the formula of the needle penetration ratio is: Np-F/D (I) [0070] where Np is a needle penetration ratio (N/mm2), F is a penetration force (N), and D is a penetration depth (mm).
[0071] A conversion mode is as follows: a uniaxial compressive strength test result (FIG. 6) of the rock sample after an indoor simulation test of dynamic piling is obtained by converting according to a relationship diagram (FIG. 5) of the calculated needle penetration ratio and uniaxial compressive strength.
[0072] A calculation mode is as follows: the calculation is carried out according to a fitting fonnula y=0.978x +2.621 (2), where x is a value of needle penetration ratio Np, and y is the uniaxial compressive strength Rc.
[0073] Finally, the uniaxial compressive strength test result of the rock sample can be obtained by one of the above two modes.
[0074] It may be understood that the uniaxial compressive strength can be obtained by using a conversion method or a calculation method alone, or by the above two methods, respectively, and the error can be reduced by comparison. The specific selection can be made according to actual demands, and there are no excessive limitations here.
[0075] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those of ordinary skill in the art, various modifications and changes may be made to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure should be included within the scope of protection of the present disclosure.

Claims (10)

  1. WHAT IS CLAIMED IS: 1. A device for testing uniaxial compressive strength of an undisturbed soft rock, comprising a force gauge, a point-cone joint, and a penetration needle detachably connected to the point-cone joint, wherein a bottom of the force gauge is movably provided with a connecting rod, a bottom of the connecting rod is detachably connected to a top of the point-cone joint, and a bottom of the point-cone joint is of a pointed structure.
  2. 2. The device for testing uniaxial compressive strength of an undisturbed soft rock according to claim 1, wherein the point-cone joint is composed of a cylindrical connecting part and a conical mounting part, the mounting part is fixedly arranged at a bottom of the connecting part, a bottom of the mounting part is of a pointed structure, and a top of the connecting part is detachably connected to a connecting rod.
  3. 3. The device for testing uniaxial compressive strength of an undisturbed soft rock according to claim 2, wherein a mounting hole is axially drilled at the center of a cone vertex at the bottom of the mounting part, and the penetration needle is in clearance fit with the mounting hole.
  4. 4. The device for testing uniaxial compressive strength of an undisturbed soft rock according to claim 3, wherein a depth of the mounting hole is less than a length of the penetration needle.
  5. 5. The device for testing uniaxial compressive strength of an undisturbed soft rock according to claim 3, wherein the mounting hole, the penetration needle and the connecting rod are coaxially provided.
  6. 6. The device for testing uniaxial compressive strength of an undisturbed soft rock according to claim 1, wherein a gauge body of the force gauge is provided with a display and a peak knob, the peak knob is capable of locking peak force measurement by rotation, and a reading on the display is returned to zero by pressing the peak knob.
  7. 7. A method for testing uniaxial compressive strength of an undisturbed soft rock, wherein the device for testing uniaxial compressive strength of an undisturbed soft rock according to any one of claims 1 to 6 is used, and the method comprises the following steps: assembling a test device; In determining the position and number of measuring points of the undisturbed soft rock; rotating a peak knob to lock a peak stress, holding a penetration needle with a hand and vertically pointing a tip of the penetration needle to one measuring point, removing the hand on the penetration needle, and pressing the device downwards by applying a force, thus penetrating the penetration needle into soil; when a needle penetration hole on a rock sample is about to break or crack, stopping applying force, separating the penetration needle from a mounting hole, and measuring a penetration depth of the penetration needle; and calculating a needle penetration ratio, and obtaining uniaxial compressive strength according to the needle penetration ratio.
  8. 8. The method for uniaxial compressive strength of an undisturbed soft rock according to claim 7, wherein the peak knob is required to be pressed for zeroing prior to every force application.
  9. 9. The method for uniaxial compressive strength of an undisturbed soft rock according to claim 7, wherein a plurality of penetration needles are required to be prepared.
  10. 10. The method for uniaxial compressive strength of an undisturbed soft rock according to claim 7, wherein the uniaxial compressive strength is obtained by performing conversion according to a relationship diagram of the calculated needle penetration ratio and uniaxial compressive strength; or, is obtained by needle penetration ratio calculation.
GB2306225.0A 2022-05-06 2023-04-27 Device and method for testing uniaxial compressive strength of undisturbed soft rock Pending GB2619605A (en)

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CN114910351A (en) * 2022-05-06 2022-08-16 青岛理工大学 Device and method for testing uniaxial compressive strength of undisturbed soft rock

Citations (4)

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CN109708985A (en) * 2019-03-08 2019-05-03 扬州大学 A kind of soft rock strength test needle penetrometer and its application method
CN113466032A (en) * 2021-05-27 2021-10-01 昆明理工大学 Soft rock strength test needle penetration device and use method thereof
JP2021196216A (en) * 2020-06-11 2021-12-27 大成建設株式会社 Device and method for testing needle penetration
CN114910351A (en) * 2022-05-06 2022-08-16 青岛理工大学 Device and method for testing uniaxial compressive strength of undisturbed soft rock

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109708985A (en) * 2019-03-08 2019-05-03 扬州大学 A kind of soft rock strength test needle penetrometer and its application method
JP2021196216A (en) * 2020-06-11 2021-12-27 大成建設株式会社 Device and method for testing needle penetration
CN113466032A (en) * 2021-05-27 2021-10-01 昆明理工大学 Soft rock strength test needle penetration device and use method thereof
CN114910351A (en) * 2022-05-06 2022-08-16 青岛理工大学 Device and method for testing uniaxial compressive strength of undisturbed soft rock

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