Anchor cables often break in various forms. Tensile failure can be resisted by using high-strength materials, while there is no good solution for shear failure. A new supporting structure called Cable and C-shaped tube that bear the transverse force was invented a preliminary introduction to mechanism of given. Field investigations in-situ stress tests were carried out on panel 3210 Nanguan Min...

In order to solve the support problem of deep soft crushed coal roadway, a concentrated cavern in mining station mine is taken as test object. Based on analysis and summary field observation data law rock pressure appearance, new technology relief anchoring with main body “initiative + borehole relief” proposed. This will carry out strong active shallow part surrounding excavate row low-density...

Artificial water pumping and rainfall will induce groundwater level fluctuations, leading to large-scale karst collapse. Therefore, the combination of physical model test FLAC3D numerical simulation is adopted simulate soil cave collapse caused by three different initial fluctuations in this paper. The influence various heights on variation water-gas pressure, pressure overlying layer, deformat...

Rock slopes have the characteristics of complex geological conditions, weak structural surface development, steep slope, and great damage. In this study, Sujiaba overpass slope in Chongqing was selected as evaluation object, main stability methods rock were analyzed. Combined with special conditions geographical location through a survey, qualitatively analyzed based on stereographic projection...

Stope with variable length is formed by change of mining face due to the irregular distribution geological rock pillars, which a typical representative complex coal seam mining. According geometric characteristics and mechanical boundaries each stage stope length, roof structure models four boundary conditions were established solved successively using small deflection thin plate bending theory...

The technology described as gob-side entry driving was adopted in the Zhaogu No. 1 mine to resolve issues pertinent mining succession tension, serious roadway deformation, and support difficulties. key parameters of coal columns must be studied ensure stable effect along-air tunneling under high stress. A calculation for vertical stress a pillar is proposed, location breaking line top plate hol...

The Himalayan region has enormous potential for hydropower development. However, variations in geological and geotechnical conditions pose challenging tasks the designers. If these are not tackled a timely manner during underground excavations, especially caverns, instabilities may occur, resulting time cost over-runs. For sustainable development, minimizing over-runs is necessary. modulus of d...

Abstract As one of the most common disasters in deep mine roadway, floor heave has caused serious obstacles to transportation and normal production activities. The third section winch roadway mining area Qitaihe Longhu coal a due large buried depths semicoal rock maximum is 750 mm. For problem stability, this paper establishes mechanical model analyze stability by analogy with basement foundati...

Evaluations of the risk fault-induced water inrush hazard is an important issue for mining engineering applications. According to characteristics seam floor during advancing, a mechanical model fault activation built obtain equations normal stress and shear on surface fault, as well mechanics criterion activation. Furthermore, using FLAC3D numerical software, variation under two different advan...

Hard rock pillar is a crucial mass structure to maintain the stability of underground mine. It needs special attention analyze its from point quality. In this paper, geological strength index (GSI) representing quality hard examined as new influence factor stability, and combined with conventional parameters (uniaxial compressive (UCS) intact mass, width (w), height (h), ratio (w/h)) complete s...