Long weekly hours of keyboard use may lead to or aggravate carpal tunnel syndrome. The effects of typing on fluid pressure in the carpal tunnel, a possible mediator of carpal tunnel syndrome, are unknown. Twenty healthy subjects participated in a laboratory study to investigate the effects of typing at different wrist postures on carpal tunnel pressure of the right hand. Changes in wrist flexio...

the hydraulic pressure is one of the most important factors in the design of pressure intake tunnels. since the surrounding media cannot usually resist the high internal pressure of these tunnels, they are usually finished with an adequate lining mostly of reinforced concrete, which is an interaction problem between water, soil or rock and concrete lining. although reinforcing the concrete lini...

Piezocone penetration test device imported from the Netherlands was used to conduct pore pressure dissipation tests at 4 measuring points in 2 holes water area of Sutong GIL utility tunnel project. After dissipation, stable analyse groundwater and further obtain height head. This method provides a successful solution for in-situ stratification testing parameters engineering, reliable hydrologic...

Seismic liquefaction affects badly the safety of underground structures. For dynamic responses tunnel in liquefied watered sandy stratum one rail transit projects Shanghai, this paper proposes a tunnel-foundation shaking table model test and analyses electrolytic desaturation technology on surrounding soil, which provides some theoretical guidance for seismic designs Shanghai projects. The resu...

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...

The hydraulic pressure is one of the most important factors in the design of pressure intake tunnels. Since the surrounding media cannot usually resist the high internal pressure of these tunnels, they are usually finished with an adequate lining mostly of reinforced concrete, which is an interaction problem between water, soil or rock and concrete lining. Although reinforcing the concrete lini...

To investigate the changes in soil dynamic response around tunnel periphery under vibration loads generated by train operation on curved sections, field measurements were carried out to observe void water pressure, level, and settlement ground. Additionally, simulation modeling using MIDAS was employed simulate analyze soil’s impact of loads. Based track stress diagram combined with axle weight...

The safety factor of rock mass surrounding tunnel can be determined using the strength reduction method (SRM), furthermore, it is very important to solve criterion critical state. For stability estimation tunnel, there need discuss that preferable use same criteria for slope stability, such as non-convergence finite element calculation, penetration plastic strain and sudden change horizontal di...

The utilization of the lining type in pressure tunnels is highly dependent on the geological and hydraulic conditions. There are two types of lining, namely concrete and steel lining but steel lining is one of the most expensive arrangements. To decrease the length of steel lining in these tunnels, the concrete lining, which prevents water seepage from the surrounding rock mass, is the appropri...

pore pressure could be estimated prior to drilling using seismic velocities. applying this approach, the final calculated pore pressure is highly affected by accuracy of the obtained velocity data. in order to generate an accurate velocity cube with proper resolution, velocities from well logs and post-stack 3-d seismic inversion are used along with stacking velocities from velocity analysis of...