Northeastern University

Jun Tian

Xiating Feng

Chengxiang Yang

Xia Ting Feng

Xi Wei Zhang

Shuai Peng

Cheng Xiang Yang

Rui Kong

Dong Hui Ma

Feng Lin

Xiwei Zhang

Lei Shi

Tianyang Tong

Shiping Li

Yanhua Gong

Mian Tian

Zhengwei Li

Zhibin Yao

Jianyu Peng

Qiang Wang

Jun Zhao

Yuemao Zhao

Jikai Gao

Jianqing Jiang

Zhi Bin Yao

Xiaojun Yu

Fengpeng Zhang

He Benguo

Jiangqing Jiang

The invention relates to a low-power microwave coring machine suitable for lunar rocks and a use method. The low-power microwave coring machine suitable for lunar rocks comprises an equipment platform, wherein the support framework front plate and the support framework rear plate are mounted on the equipment platform in a sliding manner, a rear end surface of the support framework rear plate is connected with a front end of the microwave generator mounted on the equipment platform, a rear end of the microwave generator is sequentially connected with the fixed waveguide, the rotary waveguide, the power divider and the drill drum, the high-precision slip ring structure is mounted on the drill drum, the gear ferrules are arranged on an outer wall of the rotary waveguide and an outer wall of the drill drum.

Low-power microwave coring machine suitable for lunar rocks and method of using the same

The invention relates to a one-way rapid electromagnetic unloading device suitable for a true triaxial testing machine, comprising a first electromagnet, a second electromagnet, a first electromagnet mounting base, a second electromagnet mounting base and a restraining disc. A frame of the true triaxial testing machine is provided with a mounting hole for the unloading device. The first electromagnet mounting base is fixedly mounted in the mounting hole for the unloading device, and the first electromagnet is fixedly mounted on the first electromagnet mounting base. The restraining disc is fixedly mounted at an opening of the mounting hole for the unloading device, and the second electromagnet mounting base is located between the restraining disc and the first electromagnet. The second electromagnet is fixedly mounted on the second electromagnet mounting base and is opposite to the first electromagnet.

One-way rapid electromagnetic unloading device suitable for true triaxial testing machine

The invention provides a multi-functional true triaxial shear test device and method for hard rocks, the device comprises a hydraulic system, a left-end combination tangential loading oil cylinder, a right-end combination tangential loading oil cylinder, a front-end combination lateral loading oil cylinder, a rear-end combination lateral loading oil cylinder, an upper normal loading oil cylinder, a lower normal loading oil cylinder, an annular framework, a lateral auxiliary push-and-pull framework, an annular framework support platform, a horizontal support platform and a test chamber. The stiffness of the device is improved, and besides, a total section stress covering loading manner of the rock samples in a shear process is guaranteed. Through improving a temperature reduction manner of front ends of the oil cylinders, the situation that high temperature does not enable the temperature of hydraulic oil in the oil cylinders to rise to affect normal motion of the actuator can be guaranteed.

Multi-functional true triaxial shear test device and method for hard rocks with high temperature and high pressure

A true triaxial testing system for disturbance experiment with broadband and low amplitude of a high pressure hard rock includes a low-frequency disturbance true triaxial mechanism, a variable-frequency low-speed disturbance rod mechanism and a rapid single-side unloading type specimen box. The low-frequency disturbance true triaxial mechanism and the variable-frequency low-speed disturbance rod mechanism are distributed along a straight line. The low-frequency disturbance true triaxial mechanism is independently used or cooperates with the variable-frequency low-speed disturbance rod mechanism for use. The rapid single-side unloading type specimen box cooperates with the low-frequency disturbance true triaxial mechanism for use.

True triaxial testing system for disturbance experiment with broadband and low amplitude of high pressure hard rock

A large-scale three-dimensional physical model test system for a deep cavern group comprises a base, an anti-deformation prestressed loading frame assembly, a load applying assembly, a model sample preparation and transportation assembly and a multifunctional hydraulic loading system assembly. The anti-deformation prestressed loading frame assembly and the model sample preparation and transportation assembly are both arranged on the base. The load applying assembly is arranged on the anti-deformation prestressed loading frame assembly, and the load applying assembly is connected with the multifunctional hydraulic loading system assembly. A model sample is subjected to long-time load holding, dynamic disturbance and displacement control overload under multi-surface multi-point cooperative control through cooperation between the load applying assembly and the multifunctional hydraulic loading system assembly.

Large-scale three-dimensional physical model test system and method for deep cavern group

An apparatus and method for determining time-dependence failure under constant temperature through high pressure true triaxial loading for hard rock, includes a pressure chamber and four actuators, wherein a sample bearing platform is arranged in a center of the pressure chamber, a sample bearing and containing chamber is arranged in a center of the sample bearing platform, and a confining pressure loading oil supply hole is formed in the sample bearing platform, and communicates with a confining pressure loading injection pump; each actuator includes a sealing cover, an annular end cover, a counter-force cylinder barrel, a piston, a piston rod, a sealing flange and a stress loading injection pump; a heating coil is arranged in the pressure chamber; a force sensor is fixedly mounted at the end part of the piston rod; and a pressure sensor is mounted in the sample bearing platform.

Test apparatus and method for determining time-dependence failure under constant temperature through high pressure true triaxial loading for hard rock

A high-pressure true triaxial test apparatus with capacity of low-frequency disturbance and high-speed impact includes static and dynamic loading frames, four static loading actuators, two dynamic loading actuators and an SHPB mechanism, wherein all actuators are connected with a hydraulic station system; a hollow way is formed in the axial center of each piston shaft of the dynamic loading actuators, a dynamic pressure sensor adopting a hollow ring structure is mounted at the end part of each piston shaft, and the SHPB mechanism applies a high-speed impact load on a rock sample through the dynamic pressure sensors respectively; and the dynamic loading actuators adopt a static pressure oilway balance support sealing manner and are connected with the hydraulic station system, each oilway is provided with an energy accumulator, and flow is increased by the servo valves to drive pistons to perform dynamic response.

Low-frequency disturbance and high-speed impact type high-pressure true triaxial test apparatus and method

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Shenyang, China

Jun Tian