Abstract In coal mining roadway support design, the working resistance of rock bolt is key factor affecting its maximum load. Effective improvement great significance to support. Based on bolt’s tensile characteristics and surrounding deformation, a mechanical model for calculating was established solved. Taking 17102 (3) face at Panji No. 3 Coal Mine China as research site, with quadrilateral section roadway, influence pretension anchorage length high-strength ordinary bolts in middle...

With the increase in mining depth, problem of floor heave a roadway is becoming increasingly prominent. Solving this for deep high-stress key to ensure safe supply and utilization coal resources China. This study investigates horizontal transportation rock at depth 960 m Xieyi Mine. A four-way loading simulation test frame similar Mine was used reproduce environment by different pressures on roof, floor, two sides roadway. The experimental results show that after tunnel had been excavated,...

Monitoring the stress change of bolt and knowing anchoring condition in a reasonable effective way, accurately, can effectively prevent tunnel accident from breaking out.The rock mass around roadway is usually transferred to anchor rod form axial load, so it great significance study load bolt.In this paper, full size drawing experiment system was designed established, innovatively, which realized pull-out test 2.5 m prestressed end Anchorage full-length by using new resin anchorage agent...

To investigate the deformation and damage characteristics of internal coal bodies small pillars under different pressures, rock–coal–rock assemblage samples were subjected to conventional triaxial compression test analyze mechanical behavior pressures. The results showed that, with increase in peripheral pressure, peak strength modulus elasticity specimens increased, range fracture compaction stage gradually decreased, specimen was transformed from brittle ductile. With an residual decay...

In view of the influence mining stress on stability surrounding rock inclined roof roadways in deep mines, index is defined and solved based strength criterion distribution. The roadway 17102(3) working face Pansan Coal Mine used as engineering background example. rock’ stabilities under conditions no support bolt are analyzed according to rock’s deformation data. results show that areas low wall high instability 1.68 m 2 2.12 , respectively, more stable than wall; floor 0.33 0.35 two sides....

To study the evolution law of axial force and shear stress a full-length anchorage bolt in rectangular roadway during driving working face mining, based on analysis bolt, considering elastic parameters geometric size effect bearing plate surrounding rock, cross-section shape, deformation degree, parameters, mechanics mathematical methods were used to establish mechanical model describing interaction between formulas for calculating derived. Taking mining 1,131(1) Zhujidong coal mine Huainan...

Considering the periodical moisture variation in deep rock masses, cyclic wetting and drying under high geothermal condition is a vital issue for safety stability of engineering. To investigate coupled effect water temperature on dynamic mechanical characteristics sandstone, uniaxial compressive tests were carried out same loading sandstone specimens subjected to treatment. When was 60°C both processes, treatment presents detrimental tested sandstone. Both physical deteriorate an exponential...

Due to the influence of deep high stress, geothermal heat, and other factors, law desorption methane in coal seams is more complicated process mining seams, which prone over-limit, gas outburst, accidents. In order study characteristics coalbed under different loading temperature conditions, tests at deformation stages containing were carried out loading-adsorption-desorption-reloading until sample was destroyed by using seepage-adsorption-desorption test system on rock mass, programs...

A coal-rock system is a common combination form in coal mines. In order to explore the energy interchange law of combined body and interaction relationship between two bodies, loading tests bodies with different height ratios were carried out. The path rock was demonstrated by means single unloading test same-sized sample. Furthermore, method calculate proposed based on area curve. experimental results show that greater surrounding pressure is, smaller increase rate lateral volumetric strain...

In deep coal mines, before the working face is subjected to coupled high mining-induced stress and gas pressure. Such condition may facilitate crack formation propagation in seam, leading serious disasters. this study, mechanical properties (i.e., uniaxial compressive strength, tensile fracture toughness) of gas-containing with four levels initial pressure 0.0, 0.5, 1.0, 1.5 MPa) were investigated by compression, Brazilian disc, notched semicircular bending loading test. A newly developed...

Blasting engineering is a very comprehensive and practical curriculum. However, the traditional method of teaching this curriculum relatively simple emphasizes theory over practice teaching, introduction classical methods expansion new methods, training individual abilities cultivation team spirit. To address these problems, project-driven based on concept outcomes-based education (OBE) certified by specialty was explored in study. The goals were determined index points graduation...

Abstract In this study, the movement and failure law of working face overburden distribution characteristics mining stress are analyzed using laboratory test numerical calculation methods to address problems large deformation, instability, difficult maintenance soft rock roof roadways deep stope influenced by strong disturbance, gas comprehensive treatment roadway 17191 (1) Pansan mine China Huainan Mining Group was considered as engineering background. The deformation mechanisms surrounding...