Faults are usually surrounded by damaged zones of lower elastic moduli and seismic wave velocities than their host rocks. If the interface between the damaged rocks and host rocks is sharp enough, earthquakes happening inside the fault zone generate reflected waves and head waves, which can interact with earthquake ruptures and modulate rupture properties such as rupture speed, slip rate, and r...

W e present the measurement of the p ositron lif etime spectra in the subsurf ace zones in copp er samples with surf aces damaged in dry and lubric atio n condition s. W e observe that close to the damaged surf ace the single vacancies w ere present, but deep er in the sample treated in the dry conditio n the vacancy clusters w ere detected. A zone with dislo catio ns w as located deep er than ...

In the context of feasibility study for geological disposal radioactive waste, this work focuses on numerical modeling hydromechanical response and induced damage zones around an experimental gallery at underground research laboratory (URL) Bure in France. A new phase-field method is first proposed by considering two independent fields order to easily describe both tensile shear cracks. The ext...

Knowledge excavation is a new information processing technology. Nowadays, knowledge excavation has been widely applied to the university library management. Knowledge excavation in university library knowledge bases has already been playing an important role in improving the management of university libraries and inevitably will play a more profound role in the future. In this paper, the meani...

The Tek Ada Shipwreck was discovered during underwater surveys around Kekova Adası, which is located within the district of Demre in province Antalya. shipwreck, first detected 2015, had been damaged by illicit diggings 2017. As a result excavating some sand on it, timbers from shipwreck were exposed. This situation caused decomposition ship to increase rapidly. For this reason, understand char...

Rock failure during tunnel excavation is still a matter of concern. The influence groundwater generally taken into account along discontinuities or in “soil-like” formations. However, brittle saturated porous rocks can be subject to undrained conditions excavation. Negative effective stresses develop close the boundary. This study aims at identifying limit pore pressure rock around tunnel, whic...

Among various practical measures used for restriction of the ground surface settlement in such tunnels driven in soft ground, selection of an appropriate excavation method plays a significant role. In this paper, employing suggested diagram by Yu & Chern, corresponding values of Niayesh tunnel has been inserted into the diagram. Later, two excavation methods namely: central diaphragm and side d...

In order to study the mechanism of excavation and supporting process equivalent circular roadway, model soft roadway was established firstly. The elastoplastic solutions in were deduced based on Drucker-Prager strength criterion. Then, solution under condition obtained homogenization method rockbolts liner supporting. Lastly, an example analyzed effect different factors such as “space effect,” ...