The non-Gaussian property and its influence on peak factors extreme wind pressures the long-span cylindrical roof are studied in this paper. Firstly, moment-based Hermite polynomial model (HPM), which is used to determine of processes, briefly introduced. Then, tunnel tests for scaled rigid carried out measure surface. statistical spatial distribution properties pressure demonstrated. Regions a...

According to field observation and theoretical analysis, the failure of 1523103 reserved roadway is mainly affected by lateral support pressure, rock mass strength, mode. With mining 152309 working face, pressure coal pillars on both sides increases, since lithology two floor weak, experiences spalling heave. Through numerical simulation, distribution law surrounding stress displacement are obt...

Excavating tunnels in sandy cobble strata carries a high risk of ground collapse caused by instability the tunnel face. In order to prevent at face during excavation, this paper focuses on studying effects various pre-reinforcement method stability sand-cobble strata. Firstly, projects suitable for these are proposed. Then, using FLAC3D established numerical models, then simulate excavation pro...

The Rogun hydropower plant is being constructed in Tajikistan, the valley of Vakhsh River. construction site located a narrow gorge separating and Surkh-Ku ridges. Most hydroelectric complex structures are within single tectonic block, which bounded by two faults - Ionakhsh Gulizindan, proximal to regional fault. study stress distribution around diversion tunnel was carried out numerical simula...

Youth gangs are on the rise. Today they threaten virtually every major city, many small communities, and even rural areas. The Office of Juvenile Justice and Delinquency Prevention (OJJDP) is committed to helping communities overcome this problem, and an essential first step is understanding the factors that contribute to the growth of youth gangs and the relationship of gang membership to deli...

Abstract To obtain rockburst characteristics at rock engineering, the event, in situ stress characteristics, and proneness are studied a deep gold mine. The severity of increases with cover depth main locations spalling events include roof sidewall. measurement results show this area that is controlled by horizontal constructional pressure, self-weight also has an important influence. mechanism...

BACKGROUND Transtibial drilling techniques are widely used for arthroscopic reconstruction of the anterior cruciate ligament, most likely because they simplify femoral tunnel placement and reduce surgical time. Recently, however, there has been concern that this technique results in nonanatomically positioned bone tunnels, which may cause abnormal knee function. The purpose of this study was to...