SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Disclosed is a pre-split roof caving method based on the collaboration of foam fracturing and blasting for coal mines, including: S1, construction of a borehole; S2, preparation of a foam fracturing fluid; S3, fracturing; and S4, roof caving by blasting. Foam fracturing and blasting are combined, and a great many of fractures are generated in a roof rock stratum by foam fracturing, such that the strength of the roof rock stratum is reduced, a blasting space is provided for blasting, pre-caving of a roof is realized, and safety problems caused by difficult caving of a tight roof in a goaf are avoided.

The present disclosure provides a method and device for monitoring generation of coal mine vibration and its response to vibration wave, the device comprises a frame, a vibration triggering device, an surface building model, an surface monitoring system, and an underground monitoring system. The present disclosure can simulate the mechanical process and phenomenon of high-energy and strong vibrations triggered by the fracture of the high-level thick-hard rock layers.

The present disclosure relates to the technical field of mine mining simulation, and discloses a simulation test system for multi-scale overlying strata spatial structure evolution and disaster response and a working method thereof. The system includes a loading test host, a hydraulic station, a power distribution cabinet, and an industrial control computer. The loading test host includes a base, a main framework, a first top loading unit, a second top loading unit, a bottom excavation unit, a buffering energy release device, a telescopic rod group, and rock plate stamping device. The present disclosure has multiple working modes to achieve two-dimensional/three-dimensional simulation of the movement and response characteristics of overlying strata under conditions of large burial depth, strong mining vibration, and continuous mining of multiple working faces, and to simulate the entire process of coal mine vibration and seismogenic-triggering process of coal mine earthquakes.

measuring scattering properties of a particulate matter. The experimental device includes a detachably arranged laser device, an incident light passage, a scattered light passage, a photodetector and a spherical scattering cavity, wherein the laser device, the incident light passage and the scattered light passage can rotate 360 degrees around the spherical scattering cavity for any angle adjustment. The invention can perform multi-light-source and multi-angle laser incidence and multi-angle detector detection so as to obtain scattering information of particulate matters in various samples to be measured.

Provided is a method for identifying and monitoring a water-conducting path of a water inrush source based on a similarity simulation test. The method includes: collecting mining area data, determining lithology and a laying thickness of each rock stratum in a mining area, and performing similar material proportioning for the determined lithology of each rock stratum; and using an exothermic material as a layered material for the similarity simulation test. According to the method for identifying and monitoring a water-conducting path of a water inrush source based on a similarity simulation test, the exothermic material is used in the similarity simulation test, to enhance a temperature response capability of various rock strata in a test environment. Subtle temperature changes in the rock strata can be reflected more accurately in a water inrush process, and therefore, monitoring precision is improved.

Disclosed are an underground engineering rock mass shear simulation test device, a test method and a test machine. The test method includes: setting different test conditions by a controller to perform cyclic shear test at high temperature, fracture shear seepage test, granite uniaxial compression test at high temperature and granite fracture shear test under constant normal stiffness boundary conditions at room temperature. The electric heating wire assembly, the fan assembly and the environmental box are combined to flexibly and uniformly heat the samples placed in the upper shear box and the lower shear box. In terms of shear-seepage test, this scheme proposes a second sample placing mechanism that realizes sealing through sealing capsule and sealing capsule pressing plate. It realizes stable sealing and facilitates monitoring and debugging of seepage parameters.

An intelligent automatic coal powder receiving device based on prevention and control of rock burst in coal mines includes a driving vehicle. Wheels with a moving function and a central processor are set on the driving vehicle, supporting mechanisms are set symmetrically on both sides of the driving vehicle, a coal powder storage box and a cross double frame positioning mechanism are set at the top of the driving vehicle, a coal powder receiving pipe is set on the cross double frame positioning mechanism, a binocular camera is set at the coal powder receiving pipe, and one end of the coal powder receiving pipe is a coal powder inlet, the other end of the coal powder receiving pipe is connected to the coal powder storage box through a connecting pipe, and the cross double frame positioning mechanism is connected to the driving vehicle through a telescopic mechanism.

Provided is a steam jet multifunctional aircraft deicing vehicle with steam jet, includes a vehicle body, where a steam generating assembly is arranged in the vehicle body, and the steam generating assembly is connected with a steam conveying assembly. A moving assembly is rotatably connected above the vehicle body, and the moving assembly is rotatably connected with an execution assembly. The execution assembly includes a first spray head assembly and a second spray head assembly. The steam conveying assembly includes a first supercharger and a second supercharger arranged side by side, where an air outlet end of the first supercharger is communicated with one end of a first air outlet pipe, and an other end of the first air outlet pipe is communicated with spray heads of the second spray head assembly through a first air pipeline.

A multifunctional teaching demonstration device for economic management is provided. It includes a folding device the back of the folding device is provided with multiple folding components, the front of the folding device is provided with a display, the front of the display is flexibly connected to a transparent board, the left side of the display is flexibly connected to the first demonstration module, the right side of the display is flexibly connected to the second demonstration module, there are two first teaching aid cabinets under the first demonstration module and the second demonstration module, the bottom of the first teaching aid cabinets is flexibly connected to the second teaching aid cabinet.

Provided are a precise concentration generating device and a dust generation simulation method for dust particles, wherein the device includes a smoke cake particle generator and a water tank. The top of the smoke cake particle generator is equipped with a feeding port, and the bottom is equipped with a discharging port. The discharging port is connected to a material conveying pipeline, and the initial end of the material conveying pipeline is connected to a material conveying fan. The end of the material conveying pipeline is connected to the cyclone chamber of the cyclone cylinder, and a high-temperature heating tube is set at the bottom of the cyclone chamber. The top of the cyclone cylinder is equipped with a dust outlet, and the bottom of the cyclone cylinder is equipped with a slag discharge port.