Study on the Prediction Method for Brittle Failure of Hard Rock Based on Acoustic Emission Test

2014

AMM

Self Cite

The phenomenon of spalling at Baihetan Hydropower Station is influenced by such factors as the stress redistribution in surrounding rock, the local stress concentration and also poor properties of disturbed belt. In this paper, a series of numerical simulation were carried out and some beneficial conclusions were gained as follows: 1) the ratio of maximum shear stress and uniaxial compressive strength is more rational in the prediction of spalling and can give confident explanation for “V” shape pits; 2) the in-situ geo-stress direction is in accordance with NNE and NE.

Section: Analysis and Conclusionmentioning

confidence: 99%

Geo-Stress Direction Evaluation Method Based on Numerical Simulation

2014

AMM

Self Cite

“…In the mechanical analysis, "loads-structure" model can be adopted. Numerous work had been done by researchers [1][2][3][4][5][6][7] , there is still much work to do in this field. In this paper, Hongshigou tunnel is taken as an example with stress and deformation analysis using FlAC 3D .…”

Section: Introductionmentioning

confidence: 99%

Study on Stability of Surrounding Rock in Shallow Tunnel under Unsymmetrical Pressure

Liu²,

2013

AMM

Both of the stress field and deformation are unsymmetrical for shallow tunnel under unsymmetrical pressure and geological disaster such as collapse is easily to take place. This brings about troubling problems to both design and construction. In this paper, a case of Hongshigou tunnel is studied. Aiming at dealing with the problem of low buried and unsymmetrical pressure situation of tunnel entrance, a series of numerical studies has been done based on Flac3D, after analyzing the characterization of stress field, displacement field and plastic zones, conclusions are gained as follows:1) 2) These conclusions can provide beneficial reference to design and construction for tunnel engineering.

“…It is generally acknowledged that the concentrated release of energy is a key factor which makes severe dynamic disasters especially for the hard brittle rock-mass and high geo-stresses condition. For this problem, plenty of work had been done [1][2][3][4][5] , however, there is still numerous work worth to do. In this paper, we first introduce the energy index (LERR) used in the analysis below by comparing the characteristics between results of in-door test and elastic-brittle-plastic model used in the simulation.…”

Section: Introductionmentioning

confidence: 99%

Geological Hazard Tendency Analysis of Room and Pillar Mining Method Based on Energy Index

Jiang

2013

AMM

Geological hazards especially for the dynamic disasters are proven to be the most difficult problems encountered in the deep underground projects. This paper attempts to deal with the geological problem faced by Shizhuyuan multi-ploy metallic mine base on the results of mechanics tests and numerical simulation. In order to understand the mechanism dynamic disasters, a new energy index, the Local Energy Release Rate (LERR), is put forward in the simulating process. By tracking the peak and valley values of elastic strain energy intensity before and after brittle failure, the LERR is set as an index to ascertain the scope of the high dangerous region. The results showed that LERR can satisfactorily predict the dangerous region, and it will be more accurate with some necessary monitoring method. The study indicates the potential of LERR for evaluating geological hazards in deep underground excavations.