Shenzhen University

Sichuan University

Jianbo Zhu

Heping Xie

Tao Zhou

Mingzhong Gao

Cunbao Li

Zhiyi Liao

Ling Chen

Shiwei Zhang

Junyan Li

Zhuo Cen

Weiyue Bao

Chengcheng Xie

Zhiqiang He

Jun Guo

Cong Li

Tao Suo

Zhongbin Tang

Yulong Li

Kai Zhang

Linsheng Liang

Jian Zhao

Jun Wang

Yao Wang

Jianan Li

Wenbin Sun

Guoqing Zhang

Furun Zheng

Binwen Ma

Changtai Zhou

Jiaxin Sun

Weiguo Gong

Tianqi Zhai

Junfeng Tan

The invention provides a method for preparing a porous rock and a method for quantitatively researching low-amplitude wave propagation by using the porous rock. The invention also provides a method for testing a low-amplitude ultrasonic wave propagation law of the rock by quantitatively researching a pore characteristic of the rock sample prepared by the method for preparing the porous rock. The invention solves a problem that high-precision, repeated and batch customization of rock-like porous medium samples is difficult, and improves precision of quantitatively researching the porous characteristic of the low-amplitude ultrasonic wave propagation law of the rock.

Method for preparing porous rock and method for quantitatively researching low-amplitude wave propagation by using the porous rock

Provided is a fixture applied to sticking a strain gauge on a Hopkinson square bar and a use method of the fixture. The invention is specially designed for a square waveguide bar, and the fixture further ensures consistency of the same group of strain gauges along a cross-section position of the bar. The fixture has important practical value in application in a dynamic true triaxial electromagnetic Hopkinson bar test, especially in a high-end material testing field requiring high-precision and high-reliability test data.

Fixture applied to sticking strain gauge on Hopkinson square bar and use method thereof

Provided are an energy absorbing and buffering device applied to a dynamic true triaxial electromagnetic Hopkinson bar and a testing and using method thereof. The device comprises an energy absorbing and buffering ring, an exhaust pipe and an inert gas storage bin. According to the testing and using method, the energy absorbing and buffering device is utilized and connected with a waveguide bar through a middle hollow structure; and a rear end of the energy absorbing and buffering ring is tightly attached to a baffle at a confining pressure loading end. The energy absorbing and buffering device provides energy absorbing and buffering for the waveguide bar, which prolongs a service life of the waveguide bar under an impact load.

Energy absorbing and buffering device applied to dynamic true triaxial electromagnetic Hopkinson bar and method

Provided is a dynamic true triaxial electromagnetic Hopkinson bar leveling and centering system and method. The system comprises a supporting base, a micrometer adjusting knob, a sliding platform, an auxiliary supporting plate, a fixing groove, at least two auxiliary centering targets and a lamp source. According to the auxiliary centering system, a principle that light rays are straight lines and two points form one line is adopted, and adjacent perpendicularity and coaxial centering leveling of a bar piece are determined by respectively adjusting a center of a loading end surface of the bar piece and an upper surface of the bar piece.

Dynamic true triaxial electromagnetic Hopkinson bar leveling and centering system and method

Provided is a stress blank angle eliminating device and method for a dynamic true triaxial electromagnetic Hopkinson bar. Objectives of eliminating influence of a stress blank angle in a sample in a test and preventing permanent deformation caused by mutual collision between the Hopkinson bars are achieved. The adjustable test device for eliminating the stress blank angle eliminates influence of the stress blank angle generated by the sample in a triaxial six-direction dynamic impact test process, and is convenient for obtaining real dynamic failure parameters of the sample.

Stress blank angle eliminating device and method for dynamic true triaxial electromagnetic Hopkinson bar

Disclosed are a dynamic disturbance-induced rock burst test device and a test method. The test device comprise a supporting platform, a plurality of loading plates, an electromagnetic pulse emitting system, an acoustic emission monitoring system, a high-speed camera, an electromagnetic radiation detecting system and a confining pressure servo control loading system. The plurality of loading plates are arranged on a side wall of a coal rock sample and are placed inside a square chest, the electromagnetic pulse emitting system and the confining pressure servo control loading system are arranged inside a bar system, and an acoustic emission probe is arranged inside the loading plate. A three-dimensional real stress environment of the coal rock is simulated by simulating a shear stress through friction between the loading plate and the sample, as well as dynamic and static combined loading of multi-axial and multi-directional static confining pressure and stress wave disturbance.

Dynamic disturbance-induced rock burst test device and test method

The present disclosure provides a dynamic true triaxial electromagnetic Hopkinson bar system, including a central cubic box, a horizontal cruciform support platform, and a central support platform, wherein the central cubic box is disposed in the center of the upper surface of the central support platform; the central cubic box and the horizontal cruciform support platform form an orthogonal coordinate system for precisely positioning and centering the dynamic true triaxial electromagnetic Hopkinson bar system; the confining-pressure loading systems, electromagnetic pulse generators, circular bulges, square bars, and self-lubricating square bar fixation and support frames in the directions X, Y, and Z are respectively symmetrically arranged by taking the central cubic box as a symmetric center; and the systems in the directions X, Y, and Z together construct the dynamic true triaxial electromagnetic Hopkinson bar system.

Dynamic true triaxial electromagnetic Hopkinson bar system

The present disclosure provides a thermal-stress-pore pressure coupled electromagnetic loading triaxial Hopkinson bar system and test method, the system mainly consists of an electromagnetic pulse generation system, a servo-controlled axial pressure loading system, a servo-controlled confining pressure loading system, a thermal control system, a pore pressure loading system, a bar system, and a data monitoring and acquisition system. Based on the conventional Hopkinson bar, the present disclosure creatively introduces a real-time loading and control system for confining pressure, thermal, and pore pressure, aiming to solve the technical problem that the existing test apparatus cannot be used to study dynamic response of deep rock mass under the coupling effect of thermal-stress-pore pressure and dynamic disturbance during dynamic impact loading.

Thermal-stress-pore pressure coupled electromagnetic loading triaxial Hopkinson bar system and test method

A uniaxial bidirectional synchronous control electromagnetic loaded dynamic shear test system and method, a test apparatus thereof including a support platform, a loading bar system, an electromagnetic pulse generation system, a servo-controlled normal pressure loading system, and a data monitoring and acquisition system. The test apparatus can be used to conduct a dynamic shear test research on a rock-like material under a constant normal pressure close to an actual operating condition, and can also be applied to carry out dynamic shear tests on intact rock-like test specimens in various sizes or jointed rock-like test specimens containing a single structural surface to study dynamic shear mechanical property and shear failure behavior under strain rate of 10−10s, thereby providing an important theoretical and technical support for the design, construction, protection, and safety and stability evaluation of geotechnical engineering, structural engineering.

Uniaxial bidirectional synchronous control electromagnetic loaded dynamic shear test system and method

A core sampling and preservation system comprises the following sequentially connected modules: a drive module (), a preservation module () and a core sampling module (). The core sampling module () comprises a core drilling tool and a core sample storage compartment. The preservation module () comprises a core sample preservation container. The drive module comprises a core drill having a liquid channel. The core sample preservation container comprises an inner core barrel (), an outer core barrel () and an energy storage device (). The outer core barrel () is sleeved onto the inner core barrel (). An upper end of the inner core barrel () is in communication with a liquid nitrogen storage tank (). The liquid nitrogen storage tank () is positioned inside the outer core barrel (). The energy storage device () is in communication with the outer core barrel (). The outer core barrel () is provided with a butterfly valve (). The system facilitates preserving a core at in-situ conditions, and has an increased drilling speed, thereby enhancing core sampling efficiency.

Core sampling and preservation system

A system for the in-situ retained coring of a rock sample has a driving module (), a retaining module (), and a coring module () which are connected in sequence. The coring module () includes a rock core drilling tool and a rock core sample storage cylinder, the retaining module () includes a rock core sample retaining compartment. The driving module includes a coring drill machine that has a drill machine outer cylinder unlocking mechanism. The rock core drilling tool includes a coring drill tool, a core catcher (), and an inner core pipe (). The coring drill tool has an outer core pipe () and a hollow drill bit (). The rock core sample retaining compartment has an inner coring cylinder (), an outer coring cylinder (), and an energy accumulator ().

System for in-situ retained coring of rock sample

A moon-based in-situ condition-preserved coring multi-stage large-depth drilling system and method therefor. The system includes a rotary plate provided inside a lander, an in-situ condition-preserved coring tool provided on a surface of the rotary plate, a space frame provided on a surface of the rotary plate, a working platform provided on a top of the space frame, a mechanical arm provided on a bottom surface of the working platform, and a camera provided on the bottom surface of the working platform, the mechanical arm is fixedly connected to the working platform, and the camera is fixedly connected to the working platform. By controlling the mechanical arm to place the in-situ condition-preserved coring tool on the moon surface, and using the in-situ condition-preserved coring tool to sample the lunar soil on the moon surface, the coring operation problem of the lunar soil is solved.

Moon-based in-situ condition-preserved coring multi-stage large-depth drilling system and method therefor

A fidelity retaining type coring device for a rock sample, comprising a rock core drilling tool, a rock core sample storage barrel, and a rock core sample fidelity retaining cabin. The rock core drilling tool comprises a coring drilling tool, a core catcher (), and an inner core pipe (); the coring drilling tool comprises an outer core pipe () and a hollow drill bit (), and the drill bit () is connected to the lower end of the outer core pipe (); the lower end of the inner core pipe () extends to the bottom of the outer core pipe (), and the inner core pipe () is in clearance fit with the outer core pipe (); the rock core sample fidelity retaining cabin comprises an inner coring barrel (), an outer coring barrel (), and an energy accumulator (); the outer coring barrel () is sleeved on the inner coring barrel (); the upper end of the inner coring barrel () is communicated with a liquid nitrogen storage tank (), and the liquid nitrogen storage tank () is located in the outer coring barrel (); the energy accumulator () is communicated with the outer coring barrel (); the outer coring barrel () is provided with a flap valve (). According to the device, a rock core can maintain its state in an in-situ environment; in addition, the drilling speed can be increased, and the coring efficiency can be improved.

Fidelity retaining type coring device for rock sample

The present disclosure provides a dynamic true triaxial electromagnetic Hopkinson bar system and testing method, the method including: firstly, before applying a static prestress and an impact load, recording and storing complete ultrasonic signals in the directions X, Y, and Z without application of the static prestress and the impact load; secondly, applying the static prestress; thirdly, recording and storing complete ultrasonic signals in the directions X, Y, and Z under the static prestress; fourthly, applying the impact load, and utilizing an triaxial and six-directional synchronous-coordinated-control electromagnetic loading system to apply a dynamic impact load to a test specimen; and fifthly, after completing the dynamic impact loading test, recording and storing once again complete ultrasonic signals in the directions X, Y, and Z without releasing the static prestress after application of the static prestress and the dynamic impact load.

Growing community of inventors

Shenzhen, China

Jianbo Zhu