In Sichuan Province, China, most coal seams that are mined steeply inclined; their roadways’ surrounding rocks asymmetric, with non-equilibrium deformations and unstable anchorage structures, thus making major safety hazards highly likely. Using field observations a universal distinct element code (UDEC) numerical simulation method, this paper analyzed the time-dependent failure of ventilation ...

Abstract Rock anchors are used to stabilise large-scale infrastructure such as the foundations of high buildings or road cuts, and their failure could lead severe economic social consequences. A rock anchor can fail in one more following four modes; breakage tendon steel, tendon-grout bond failure, grout-rock mass failure. In current design, knowledge for first two modes is satisfactorily known...

Due to the challenge of measuring rock bridges in field and negligence progressive damage changes stresses within a mass when defining bridges, it is questionable evaluate mechanical properties using only geometric parameters. A demonstration scale effects because same parameter may refer different sizes numbers leading erroneous equivalent responses. In this context, in-plane slope engineering...

Under the engineering background of a + 144-m mining platform on an open pit slope Xinqiao Mining Corporation, eigenvalue distribution function joints was acquired based massive statistics field joints. Next, orthogonal random joint model constructed using Monte Carlo method UDEC software platform. Subsequently, representative elementary volume (REV) size and occurrence effects equivalent elast...

Longwall backfill mining effectively mitigates the height of water-conductive fractured zone (HWCFZ), preventing it from reaching overlying aquifer and thus preserving groundwater. However, has disadvantages insufficient filling time space as well mutual constraints between mining. A novel continuous extraction partial (CEPB) water-preserving method was therefore proposed. The analytic hierarch...

Coal gangue slurry filling is an important technical means for harmless and large-scale disposal of under low-interference conditions, one the most ways to achieve green mining, which in line with national concept development. This paper systematically expounds background scientific connotations birth filling, clarifies key technology process principles constructs lag distance optimization meth...