Part of the chambers of the coalmine roadway in Western Inner Mongolia and Eastern Ningxia of China are in weakly consolidated soft rock formation. Taking the horse head engineering in Maiduoshan coal mine in the main level as an example, a new scheme was put forward to optimize the original supporting scheme. A three-dimensional numerical model of the project of horse head was set up. Accordin...

The Chamshir water conveyance tunnel (CWCT) with a length of 7.4 km and boring diameter of 5.3 m is excavated using a refurbished single shield TBM, initially designed to work in hard rock formations. This study focuses on engineering geological issues, which are important for checking the suitability of this machine and proposing required modifications for improving its performance in soft roc...

this study is an attempt to evaluate the biomonitoring capabilities of rock oyster, saccostrea cucullata, for mercury (hg) pollution. the oyster and sediment samples were collected from 10 rocky habitats of qeshm and hormoz islands in the persian gulf. the concentration of mercury in the shell and soft tissues of the oysters and sediments were analyzed using an advanced mercury analyzer. biota-...

[1] We present a methodology to obtain frequencydependent relative site amplification factors using ambient seismic noise. We treat a seismic network or array as a forced damped harmonic oscillator system where each station responds to a forcing function obtained from frequencywavenumber beams of the ambient noise field. A network or array beam is necessary to estimate the forcing function. Tak...

We study the structural instability mechanism and effect of a multi-echelon support in very-deep roadways. We conduct a scale model test for analysing the structural failure mechanism and the effect of multi-echelon support of roadways under high horizontal stress. Mechanical bearing structures are classified according to their secondary stress distribution and the strength degradation of the s...