WO2020215346A1 - Rock triaxial direct shear test apparatus and method - Google Patents

Rock triaxial direct shear test apparatus and method Download PDF

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Publication number
WO2020215346A1
WO2020215346A1 PCT/CN2019/084898 CN2019084898W WO2020215346A1 WO 2020215346 A1 WO2020215346 A1 WO 2020215346A1 CN 2019084898 W CN2019084898 W CN 2019084898W WO 2020215346 A1 WO2020215346 A1 WO 2020215346A1
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sample
confining pressure
shear
shearing
tested
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PCT/CN2019/084898
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French (fr)
Chinese (zh)
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刘造保
邵建富
张超
谢守益
沈挽青
蔡力聪
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东北大学
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Publication of WO2020215346A1 publication Critical patent/WO2020215346A1/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/24Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0025Shearing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075Strain-stress relations or elastic constants
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/025Geometry of the test
    • G01N2203/0256Triaxial, i.e. the forces being applied along three normal axes of the specimen
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/06Indicating or recording means; Sensing means
    • G01N2203/067Parameter measured for estimating the property
    • G01N2203/0676Force, weight, load, energy, speed or acceleration
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/06Indicating or recording means; Sensing means
    • G01N2203/067Parameter measured for estimating the property
    • G01N2203/0682Spatial dimension, e.g. length, area, angle

Abstract

A rock triaxial direct shear test apparatus and method. Said apparatus comprises confining pressure balance shearing mechanisms and a soft sample sealing sleeve (1); the confining pressure balance shearing mechanisms are fixed at two ends of a sample (2), and the soft sample sealing sleeve (1) is sleeved outside the sample (2) and the confining pressure balance shearing mechanisms at the two ends thereof; the confining pressure balance shearing mechanisms each comprise a shearing base (3), the shearing base (3) is in contact with one side of an end portion of the sample (2), a chamber is formed between the shearing base (3), the other side of the end portion of the sample (2) and the soft sample sealing sleeve (1), an elastic cavity body adapted to the shape of the chamber is provided in the chamber, the shearing base (3) is provided with a balance conduit, one end of the balance conduit is in communication with a cavity inside the elastic cavity body, the other end of the balance conduit is in communication with the outside of the soft sample sealing sleeve (1), and the two confining pressure balance shearing mechanisms are oppositely arranged. By applying self-balancing confining pressure to the outer periphery and end portions of the sample (2) and conducting a shear test on the sample (2), an evaluation test on the shear mechanical behavior of deep engineering rock mass is realized, and the experimental error is reduced.

Description

一种岩石三轴直接剪切实验装置和方法Rock triaxial direct shearing experiment device and method 技术领域Technical field

本发明属于岩石实验技术领域,具体涉及一种岩石三轴直接剪切实验装置和方法。The invention belongs to the technical field of rock experiments, and in particular relates to a rock triaxial direct shearing experimental device and method.

背景技术Background technique

岩石在地层中都是受到三向地应力作用。岩石在三向应力下的剪切破坏过程和抗剪强度是岩石工程设计中普遍需要关注的问题。目前岩石的抗剪强度一般是通过剪切盒、常规三轴直接剪切实验的方式近似确定,现有在有围压(即法向力)作用下发生较大剪切变形时,。现有剪切盒实验装置和岩石常规直接剪切装置无法在加载面上实现围压自平衡,从而导致高围压下的三轴直接剪切实验易产生偏转端部挤压效应,在位移较大时测量的应力和位移均存在很大误差,导致抗剪强度无法准确获取。Rocks are subjected to three-dimensional ground stress in the formation. The shear failure process and shear strength of rock under three-dimensional stress are issues that generally require attention in rock engineering design. At present, the shear strength of rock is generally determined approximately by means of shear box and conventional triaxial direct shear experiments. At present, when large shear deformation occurs under the action of confining pressure (ie, normal force). The existing shear box experiment device and the conventional rock direct shear device cannot achieve self-balance of confining pressure on the loading surface, which leads to the triaxial direct shear experiment under high confining pressure which is prone to deflection end squeezing effect, and the displacement is relatively high. There are large errors in the measured stress and displacement when large, resulting in the inaccurate acquisition of the shear strength.

发明概述Summary of the invention

技术问题technical problem

问题的解决方案The solution to the problem

技术解决方案Technical solutions

本发明目的在于提供一种岩石三轴直接剪切实验装置和方法,用于获取岩石三轴应力下的抗剪强度和三轴剪切破坏过程,为岩石工程设计和建设安全提供准确的评价方法和依据。The purpose of the present invention is to provide a rock triaxial direct shear experiment device and method, which are used to obtain the shear strength and triaxial shear failure process of the rock under triaxial stress, and provide an accurate evaluation method for rock engineering design and construction safety And basis.

本发明技术方案如下:The technical scheme of the present invention is as follows:

一种岩石三轴直接剪切实验装置,包括围压自平衡剪切部件和软质试样密封套,待测试样的两端分别设置有围压自平衡剪切部件,软质试样密封套套设于待测试样及其两端的围压自平衡剪切部件的外侧,所述围压自平衡剪切部件包括剪切基座、金属垫板以及围压自平衡体,所述的剪切基座与待测试样端面的轴线一侧平面接触,接触面积为试样端部面积的1/2,剪切基座上开设有一直角弯导孔,所述围压自平衡体为一端设置有引出管路的薄壁空腔体,其引出管路通过剪切基 座上设置的导孔与待测试样外部连通,所述金属垫板为一薄片金属板,其横截面为待测试样横截面的1/2,围压自平衡体的侧面与剪切基座紧密贴合接触,围压自平衡体的底面与待测试样端面的轴线另一侧通过金属垫片紧密贴合接触,两个围压自平衡剪切部件以待测试样的中心为中心反对称设置。A three-axis direct shearing experimental device for rock, which includes a confining pressure self-balanced shearing component and a soft sample sealing sleeve. The two ends of the sample to be tested are respectively provided with confining pressure self-balanced shearing components, and the soft sample is sealed The sleeve is sleeved on the sample to be tested and the outer side of the confining pressure self-balancing shearing component at both ends thereof. The confining pressure self-balancing shearing component includes a shear base, a metal backing plate and a confining pressure self-balancing body. The cutting base is in flat contact with the side of the axis of the end face of the sample to be tested, the contact area is 1/2 of the area of the end of the sample, the cutting base is provided with a right-angled guide hole, and the confining pressure self-balancing body is one end A thin-walled hollow body with a lead-out pipeline is provided. The lead-out pipeline communicates with the outside of the sample to be tested through a guide hole provided on the shear base. The metal backing plate is a thin metal plate whose cross-section is 1/2 of the cross section of the test sample, the side surface of the confining pressure self-balancing body is in close contact with the shear base, and the bottom surface of the confining pressure self-balancing body is tightly connected to the other side of the axis of the end face of the test sample through a metal gasket For fitting contact, the two confining pressure self-balancing shear components are arranged antisymmetrically with the center of the sample to be tested.

围压自平衡体的引出管路与剪切基座上的导孔的连接处设置有密封圈。A sealing ring is arranged at the junction of the lead-out pipeline of the confining pressure self-balancing body and the guide hole on the shear base.

所述软质试样密封套和围压自平衡体均采用高强度柔性材质制成。The soft sample sealing sleeve and the confining pressure self-balancing body are made of high-strength flexible materials.

可选的,所述软质试样密封套和围压自平衡体均采用橡胶材质制成。Optionally, the soft sample sealing sleeve and the confining pressure self-balancing body are made of rubber materials.

一种岩石三轴直接剪切实验方法,采用前述的一种岩石三轴直接剪切实验装置,包括以下步骤:A rock triaxial direct shearing experiment method adopts the aforementioned rock triaxial direct shearing experimental device, including the following steps:

步骤1、将围压自平衡体的引出管路插入到剪切基座上的导孔内,放置金属垫板于待测试样表面,将剪切基座、围压自平衡体、金属垫片和待测试样相互位置固定,将软质试样密封套套设于待测试样及其两端的围压自平衡部件的外侧,并保证剪切基座上的导孔不被软质试样密封套覆盖,并在软质密封套的两个末端外侧用箍环箍紧,使得软质试样密封套与剪切基座紧密贴合,将安装好的含待测试样的剪切实验装置放置于普通三轴实验装置的待测试样放置处;Step 1. Insert the lead-out pipeline of the confining pressure self-balancing body into the guide hole on the shearing base, and place the metal backing plate on the surface of the sample to be tested, and the shearing base, confining pressure self-balancing body, and metal pad The sheet and the sample to be tested are fixed to each other, and the soft sample sealing sleeve is sleeved on the outer side of the sample to be tested and the confining pressure self-balancing components at both ends, and the guide hole on the shear base is not affected by the soft test. The sample sealing sleeve is covered, and the two ends of the soft sealing sleeve are tightened with hoop rings to make the soft sample sealing sleeve closely fit the shear base, and cut the installed sample containing the sample to be tested. The experimental device is placed in the place where the sample to be tested is placed on the ordinary three-axis experimental device;

步骤2、在整个实验装置外部利用液压油施加围压,围压数值可等于待测试岩石所处原位地应力的平均值,一方面液压油通过软质试样密封套向试样外周施加侧向压力,并通过剪切基座向试样端部轴线一侧施加轴向压力,另一方面液压油通过剪切基座上的导孔进入围压自平衡体内部,通过围压自平衡体向试样两端施加等值于径向围压的轴向围压;Step 2. Use hydraulic oil to apply confining pressure outside the entire experimental device. The confining pressure value can be equal to the average value of the in-situ stress of the rock to be tested. On the one hand, the hydraulic oil is applied to the outer periphery of the sample through the soft sample sealing sleeve Axial pressure is applied to the end axis of the specimen through the shear base. On the other hand, hydraulic oil enters the confining pressure self-balancing body through the guide hole on the shear base, and passes through the confining pressure self-balancing body Apply an axial confining pressure equal to the radial confining pressure to both ends of the sample;

步骤3、维持围压数值恒定,在两个剪切基座上同时逐步施加轴向剪切力直至试样破坏,并记录试样破坏过程中的剪切力和变形,即得到试样三轴剪切破坏过程的应力应变曲线,并获取试样的三轴剪切强度。Step 3. Keep the confining pressure constant, apply axial shear force on the two shear bases at the same time until the sample is broken, and record the shear force and deformation during the destruction of the sample, that is, the sample triaxial The stress-strain curve of the shear failure process, and obtain the triaxial shear strength of the sample.

发明的有益效果The beneficial effects of the invention

有益效果Beneficial effect

与现有技术相比,本发明的有益效果是:Compared with the prior art, the beneficial effects of the present invention are:

本发明根据深部工程原位地的应力,确定实验围压值,在试样受围压作用下开展直接剪切试验,剪切力不受围压和剪切位移的大小限制,因此,本发明可开 展高围压、大剪切变形的三轴剪切试验,可以更准确地获取待测试样的三轴抗剪强度,实现对深部工程岩体剪切力学行为的有效评估。The invention determines the experimental confining pressure value according to the in-situ stress of the deep engineering, and carries out the direct shear test under the action of the confining pressure of the sample. The shear force is not limited by the confining pressure and shear displacement. Therefore, the present invention The triaxial shear test with high confining pressure and large shear deformation can be carried out, and the triaxial shear strength of the sample to be tested can be obtained more accurately, and the effective evaluation of the shear mechanical behavior of deep engineering rock mass can be realized.

对附图的简要说明Brief description of the drawings

附图说明Description of the drawings

图1为本发明剪切实验装置的剖面结构示意图;Figure 1 is a schematic cross-sectional structure diagram of the shearing experiment device of the present invention;

图2为图1中B-B的剖视示意图;Fig. 2 is a schematic sectional view of B-B in Fig. 1;

图3为本发明剪切实验时试样的受力示意图;Figure 3 is a schematic diagram of the force applied to the sample during the shear experiment of the present invention;

其中:软质试样密封套1;待测试样2;剪切基座3;围压自平衡体4;导孔5;金属垫板6;密封圈7。Among them: soft sample sealing sleeve 1; sample to be tested 2; shear base 3; confining pressure self-balancing body 4; pilot hole 5; metal backing plate 6; sealing ring 7.

发明实施例Invention embodiment

本发明的实施方式Embodiments of the invention

需要说明,本发明实施例中所有方向性指示(诸如上、下、左、右、前、后......)仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等,如果该特定姿态发生改变时,则该方向性指示也相应地随之改变。It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain each in a certain posture (as shown in the accompanying drawings). If the relative positional relationship between the components, the movement situation, etc. change, the directional indication will change accordingly.

如图1至图3所示,本发明提供了一种岩石三轴直接剪切实验装置,包括围压自平衡剪切部件和软质试样密封套1,待测试样2的两端均固定有围压自平衡剪切部件,软质试样密封套1套设于待测试样2及其两端的围压自平衡剪切部件的外侧,所述围压自平衡剪切部件包括剪切基座3、金属垫板6以及围压自平衡体4,所述剪切基座3与待测试样2端面的一侧接触,接触面积为试样2端部面积的1/2,剪切基座3上开设有一直角弯导孔5,所述的金属垫板6为一薄片金属板,其横截面为待测试样2横截面的一半,所述的围压自平衡体4为一端设置有引出管路的薄壁空腔体,其中引出管路通过剪切基座3上设置的导孔5与待测试样2外部连通,围压自平衡体4的侧面与剪切基座3紧密贴合接触,围压自平衡体4的底面与待测试样2端面另一侧设置的金属垫片6紧密贴合接触,两个围压自平衡剪切部件反对称设置,以实现剪切试样2的目的。As shown in Figures 1 to 3, the present invention provides a rock triaxial direct shear experiment device, which includes a confining pressure self-balancing shear component and a soft sample sealing sleeve 1. Both ends of the sample 2 to be tested are The confining pressure self-balancing shearing part is fixed, and the soft sample sealing sleeve 1 is sleeved on the sample 2 to be tested and the outer side of the confining pressure self-balancing shearing part at both ends thereof. The confining pressure self-balancing shearing part includes shears. The cutting base 3, the metal backing plate 6 and the confining pressure self-balancing body 4 are in contact with one side of the end surface of the sample 2 to be tested, and the contact area is 1/2 of the end area of the sample 2, The shear base 3 is provided with a right-angled guide hole 5, the metal backing plate 6 is a thin metal plate, the cross section of which is half of the cross section of the sample 2 to be tested, and the confining pressure self-balancing body 4 It is a thin-walled cavity with an outlet pipeline at one end, and the outlet pipeline communicates with the outside of the sample 2 to be tested through the guide hole 5 provided on the shear base 3. The base 3 is in close contact with each other. The bottom surface of the confining pressure self-balancing body 4 is in close contact with the metal gasket 6 provided on the other side of the end surface of the sample 2 to be tested. To achieve the purpose of shearing sample 2.

具体的,围压自平衡体4与待测试样2之间设置有金属垫板6,金属垫板6与围压自平衡体4之间紧密贴合接触。Specifically, a metal backing plate 6 is provided between the confining pressure self-balancing body 4 and the sample 2 to be tested, and the metal backing plate 6 is in close contact with the confining pressure self-balancing body 4.

导孔5与围压自平衡体4连接处设置有密封圈7。A sealing ring 7 is provided at the junction of the guide hole 5 and the confining pressure self-balancing body 4.

所述软质试样密封套1和围压自平衡体4均采用橡胶材质制成The soft sample sealing sleeve 1 and the confining pressure self-balancing body 4 are made of rubber material

一种岩石高围压大变形三轴直接剪切实验方法,采用前述的一种岩石三轴直接剪切实验装置,包括以下步骤:A rock high confining pressure and large deformation triaxial direct shear experiment method adopts the aforementioned rock triaxial direct shear experiment device, including the following steps:

步骤1、将待测试样2固定于两个围压自平衡剪切部件之间,并将软质试样密封套1套设于待测试样2及其两端的围压自平衡剪切部件的外侧,将安装好的实验装置放置于普通三轴实验装置的待测试样放置处;Step 1. Fix the sample 2 to be tested between the two confining pressure self-balanced shearing parts, and set the soft sample sealing sleeve 1 on the sample 2 to be tested and the confining pressure self-balanced shearing at both ends On the outside of the components, place the installed experimental device at the place where the sample to be tested is placed on the ordinary three-axis experimental device;

步骤2、在整个剪切实验装置外部利用液压油施加围压P C,围压数值可以等于待测岩石试样的原位地应力平均值,如图3所示,一方面液压油通过软质试样密封套1向待测试样2外周施加侧向围压,并通过剪切基座3向待测试样2端部轴线一侧施加轴向压力,另一方面液压油通过导孔5进入围压自平衡体4内部,通过围压自平衡体4向待测试样2两端施加等值于径向围压的轴向压力; Step 2. Use hydraulic oil to apply confining pressure P C outside the entire shearing experiment device. The confining pressure value can be equal to the average value of the in-situ stress of the rock sample to be tested, as shown in Figure 3. On the one hand, the hydraulic oil passes through the soft The sample sealing sleeve 1 applies lateral confining pressure to the outer circumference of the sample 2 to be tested, and applies axial pressure to the end axis of the sample 2 through the shear base 3. On the other hand, the hydraulic oil passes through the guide hole 5 Enter the confining pressure self-balancing body 4, and apply an axial pressure equivalent to the radial confining pressure to both ends of the sample 2 to be tested through the confining pressure self-balancing body 4;

步骤3、维持围压数值恒定,在两个剪切基座3上同时逐步施加轴向剪切力F直至待测试样2破坏,并记录待测试样2破坏过程中的剪切力和变形,即得到待测试样2三轴剪切破坏过程的应力应变曲线,并获取待测试样2的三轴剪切强度(应力应变曲线的峰值应力)。Step 3. Keep the confining pressure constant, apply the axial shear force F to the two shear bases 3 at the same time until the sample 2 to be tested is broken, and record the shear force and the shear force during the failure of the sample 2 to be tested. Deformation is to obtain the stress-strain curve of the test sample 2 during the triaxial shear failure process, and obtain the triaxial shear strength (the peak stress of the stress-strain curve) of the test sample 2.

以上实施例仅用以说明本发明的技术方案而非对其限制,尽管参照上述实施例对本发明进行了详细说明,领域的普通技术人员应当理解:依然可以对本发明的具体实施方式进行修改或者等同替换,而未脱离本发明精神和范围的任何修改或者等同替换,其均应涵盖在本权利要求范围当中。The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the specific embodiments of the present invention can still be modified or equivalent Replacement, any modification or equivalent replacement that does not depart from the spirit and scope of the present invention, shall be covered by the scope of the claims.

Claims (5)

  1. 一种岩石三轴直接剪切实验装置,其特征在于,包括围压自平衡剪切部件和软质试样密封套,待测试样的两端分别设置有围压自平衡剪切部件,软质试样密封套套设于待测试样及其两端的围压自平衡剪切部件的外侧,所述围压自平衡剪切部件包括剪切基座、金属垫板以及围压自平衡体,所述的剪切基座与待测试样端面的轴线一侧平面接触,接触面积为试样端部面积的1/2,剪切基座上开设有一直角弯导孔,所述围压自平衡体为一端设置有引出管路的薄壁空腔体,其引出管路通过剪切基座上设置的导孔与待测试样外部连通,所述金属垫板为一薄片金属板,其横截面为待测试样横截面的1/2,围压自平衡体的侧面与剪切基座紧密贴合接触,围压自平衡体的底面与待测试样端面的轴线另一侧通过金属垫片紧密贴合接触,两个围压自平衡剪切部件以待测试样的中心为中心反对称设置。A three-axis direct shearing experimental device for rock, which is characterized in that it comprises a confining pressure self-balanced shearing component and a soft sample sealing sleeve. Both ends of the sample to be tested are respectively provided with confining pressure self-balanced shearing components. The sealing sleeve of the quality sample is sleeved on the outer side of the self-balanced shearing component of confining pressure at both ends of the sample to be tested, and the self-balanced shearing component of confining pressure includes a shear base, a metal backing plate and a confining pressure self-balanced body, The shearing base is in planar contact with the side of the axis of the end face of the sample to be tested, and the contact area is 1/2 of the area of the end of the sample. The shearing base is provided with a right-angled guide hole, and the confining pressure is automatically The balance body is a thin-walled hollow body with a lead-out pipeline at one end, and the lead-out pipeline communicates with the outside of the sample to be tested through a guide hole provided on the shear base. The metal backing plate is a thin metal plate. The cross section is 1/2 of the cross section of the sample to be tested. The side surface of the confining pressure self-balancing body is in close contact with the shear base, and the bottom surface of the confining pressure self-balancing body passes through the other side of the axis of the end face of the sample to be tested The metal gasket is in close contact with each other, and the two confining pressure self-balancing shear components are arranged antisymmetrically with the center of the sample to be tested.
  2. 根据权利要求1所述的一种岩石三轴直接剪切实验装置,其特征在于,围压自平衡体的引出管路与剪切基座上的导孔的连接处设置有密封圈。The rock triaxial direct shear experiment device according to claim 1, characterized in that a sealing ring is provided at the junction of the lead-out pipeline of the confining pressure self-balancing body and the guide hole on the shear base.
  3. 根据权利要求1所述的一种岩石三轴直接剪切实验装置,其特征在于,所述软质试样密封套和围压自平衡体均采用柔性材质制成。The rock triaxial direct shear experiment device according to claim 1, wherein the soft sample sealing sleeve and the confining pressure self-balancing body are made of flexible materials.
  4. 根据权利要求3所述的一种岩石三轴直接剪切实验装置,其特征在于,所述软质试样密封套和围压自平衡体均采用橡胶材质制成。The rock triaxial direct shearing experimental device according to claim 3, wherein the soft sample sealing sleeve and the confining pressure self-balancing body are made of rubber material.
  5. 一种岩石三轴直接剪切实验方法,采用如权利要求1至4中任意一项所述的一种岩石三轴直接剪切实验装置,其特征在于,包括以下步骤:A rock triaxial direct shearing experiment method adopts the rock triaxial direct shearing experimental device according to any one of claims 1 to 4, characterized in that it comprises the following steps:
    步骤1、将围压自平衡体的引出管路插入到剪切基座上的导孔内,放置金属垫板于待测试样表面,将剪切基座、围压自平衡体、金属垫片和待测试样相互位置固定,将软质试样密封套套设于待测试样及其两端的围压自平衡部件的外侧,并保证剪切基座上的导 孔不被软质试样密封套覆盖,并在软质密封套的两个末端外侧用箍环箍紧,使得软质试样密封套与剪切基座紧密贴合,将安装好的含待测试样的剪切实验装置放置于普通三轴实验装置的待测试样放置处;Step 1. Insert the lead-out pipeline of the confining pressure self-balancing body into the guide hole on the shearing base, and place the metal backing plate on the surface of the sample to be tested, and the shearing base, confining pressure self-balancing body, and metal pad The sheet and the sample to be tested are fixed to each other, and the soft sample sealing sleeve is sleeved on the outer side of the sample to be tested and the confining pressure self-balancing components at both ends, and the guide hole on the shear base is not affected by the soft test. The sample sealing sleeve is covered, and the two ends of the soft sealing sleeve are tightened with hoop rings to make the soft sample sealing sleeve closely fit the shear base, and cut the installed sample containing the sample to be tested. The experimental device is placed in the place where the sample to be tested is placed on the ordinary three-axis experimental device;
    步骤2、在整个实验装置外部利用液压油施加围压,围压数值可等于待测试岩石所处原位地应力的平均值,一方面液压油通过软质试样密封套向试样外周施加侧向压力,并通过剪切基座向试样端部轴线一侧施加轴向压力,另一方面液压油通过剪切基座上的导孔进入围压自平衡体内部,通过围压自平衡体向试样两端施加等值于径向围压的轴向围压;Step 2. Use hydraulic oil to apply confining pressure outside the entire experimental device. The confining pressure value can be equal to the average value of the in-situ stress of the rock to be tested. On the one hand, the hydraulic oil is applied to the outer periphery of the sample through the soft sample sealing sleeve Axial pressure is applied to the end axis of the specimen through the shear base. On the other hand, hydraulic oil enters the confining pressure self-balancing body through the guide hole on the shear base, and passes through the confining pressure self-balancing body Apply an axial confining pressure equal to the radial confining pressure to both ends of the sample;
    步骤3、维持围压数值恒定,在两个剪切基座上同时逐步施加轴向剪切力直至试样破坏,并记录试样破坏过程中的剪切力和变形,即得到试样三轴剪切破坏过程的应力应变曲线,并获取试样的三轴剪切强度。Step 3. Keep the confining pressure constant, apply axial shear force on the two shear bases at the same time until the sample is broken, and record the shear force and deformation during the destruction of the sample, that is, the sample triaxial The stress-strain curve of the shear failure process, and obtain the triaxial shear strength of the sample.
PCT/CN2019/084898 2019-04-26 2019-04-29 Rock triaxial direct shear test apparatus and method WO2020215346A1 (en)

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CN105203411A (en) * 2015-11-06 2015-12-30 武汉大学 Slit shear-seepage coupling test system of triaxial cell and test method
CN106442172A (en) * 2016-11-09 2017-02-22 中国科学院武汉岩土力学研究所 Multiphase flow-stress coupling rock-core shearing test device and method thereof
CN107748110A (en) * 2017-09-19 2018-03-02 太原理工大学 The axle dynamic shearing seepage flow of microcomputer controlled electro-hydraulic servo rock three couples multifunction test method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5817946A (en) * 1996-10-28 1998-10-06 Test Quip, Inc. Gyratory compaction apparatus for creating compression and shear forces in a sample material
CN102901676A (en) * 2012-10-31 2013-01-30 河海大学 Vertical direct shear test device
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