The roadway driving along the roof for large embedded depth often had irregular failure in inclined coal seam at one coalmine, in order to analyze the failure law of roadway, this paper adopted the method of elastic-plastic analysis and numerical simulation to study the stress, plastic zone and deformation...

With the rapid development of science and technology, the ratio of accidents that caused by human unsafe behavior is getting higher and higher in complex industrial systems. Aiming at the situation of lacking the basic theory research about human safety behavior, taking the construction of overall model...

In order to solve the problem that when using gob-side entry retaining, the overall cost of roadside support was expensive, the construction technology was very complicated and the stability of roof rock destroyed easily, gob-side entry retaining without roadside support that based upon the roof control...

The principle and test method of drilling strata movement detection is introduced. The failure law of stope drilling strata movement was analyzed and judged by useing the swell character of compresspoed wood when it met upon the water and moves along with surrounding rock. The height of caving zone and...

In order to obtain the influence law of mining depth on floor coupled stress-seepage characteristics, the coupled stress-seepage characteristics were studied by numerical simululation. The results showed that when the mining depth increases, the floor failure range progressively increase with expansion...

According to the appeared incident dynamic pressure of 1304 working face in a mine, the characteristics of electromagnetic emission signal were analyzed before the dynamic pressure occurred; FLAC3D was used to simulate the impact on pressure relief effect under the conditions of different borehole diameter,...

At present, over coring method by using hollow inclusion strain cells are applied widely for geostress measurement. But there are some errors in measurement accuracy. In order to improve the measurement precision and reliability of stress relief method, the paper analyzed the influence of drilling aperture...

Coal roadway tunneling could result in redistribution of stresses in the coal body around the roadway, and cause the spatially uneven distribution of permeability in the coal body around roadway both in the radial direction and the axial direction. Considering this engineering fact and using the lattice...

Cyclonic duster has become the mainstream in fully mechanized workface, better than any other kinds of dusters in dust removal efficiency, sewage discharge, disassembly and assembly, moving with the boring machine etc. This paper reveals the effect that the opening of the throttle plate significantly...

According to the fact that the coal seam in our country is soft and the traditional sampling equipment is difficult to achieve the required sampling depth, speed, integrity and so on, integrative jumbo of deep hole sampling is designed and built, this jumbo has the properties of large power and small...

This article was based on the serious water inrush accident of Kunlun Mine, Kunlun Town, Zichuan County, Zibo City. According to the old gob water inrush mechanism, combining with the results of the numerical simulation, it analyzes the causation and the conditions of this accident, discloses the evil...

In the paper, the comprehensive research was composed of main controlling factors of floor water inrush in deep mine, method of floor water inrush risk assessment and risk assessment system, which was carried on three aspects of the deep seam mining floor water inrush factors analysis, the mathematical...

The key to prevent coal mine water disaster is finding out the "three elements" which is separately named source, channel and strength. Only by figuring out the "three elements", can the coal mine water-disaster prevention and control work achieve its target. Through analyzing the inrush source, influence...

An coal mine belongs to the coal mining under medium aquifer, under which there is no stable clay aquifuge.To demonstrate the safety and reliability of coal and rock pillars, study and analysis of the failure and movement feature of overlying strata are conducted in the condition of the mine’s geology...

In order to make inrush coefficient method more accurate and effective in the coal floor water bursting evaluation, taking into account the interaction between the mine floor and the fault under the influence of mining, establishing the model of hanging wall tilting resisting key strata, solving the...

Aiming at the disadvantages of being unable to detect the comprehensive and reliable acoustic emission(AE) signals with acoustic emission detector installed outside the triaxial chamber, reasonable test method is realized with the AE detector installed inside the triaxial chamber based on the communication...

Heterogeneity of rocks has a great influence on macroscopic mechanical behaviors. So in rock mechanics research, the heterogeneity should be described properly. This paper presents Weibull distribution, which can describe the microstructure parameters heterogeneity, and sums up heterogeneous parameter’s...

This paper simulated the effects of faults on mine pressure distributions in coal mining process by using UDEC4.0 numerical simulation software. The rock burst mechanisms of normal faults and thrust faults were analyzed first. After that, the working face of front abutment pressure peak values and distributions...

Based on the analysis of the hard roofs movement law in the a mine short wall stope, a kind of caving technology combining the deep hole blasting and the shallow hole blasting is put forward. The advantage of this technology is to set deep hole blastholes in connection drifts so that the blasting down...

The article proposed equation criteria specifying the interaction force field with the medium. Based on the proposed regularities we suggested the medium parameters changes dependences and momentum and energy characteristics, the resistance of the medium on which the formation hazards equation were made....

Therein there is formation of algorithms database of stress-strain state of reinforced soil foundations and optimizing the main parameters of the computer model. The analysis of the results of calculations for the foundation strip, slab and columar type on homogeneous and layered the basis

The properties of the inert compositions obtained by liquid nitrogen and water co-spraying are shown. The high performance of inert compositions made of gas-borne ice particles to extinguish underground in worked-out mine area is demonstrated. A reduction in coal reactivity after treatment with inert...

The main differences of coal bed methane from other unconventional hydrocarbon resources are shown. Characteristics features of hydraulic fracture operation of coal seams are analyzed. The factors, affecting the permeability of reinforced crack of hydraulic fracture are marked. And the modeling peculiarities...