This paper analyzes various schemes for the Euler-Poisson-Boltzmann (EPB) model of plasma physics. This model consists of the pressureless gas dynamics equations coupled with the Poisson equation and where the Boltzmann relation relates the potential to the electron density. If the quasi-neutral assumption is made, the Poisson equation is replaced by the constraint of zero local charge and the ...

During earth pressure balance (EPB) shield tunnelling in sandy ground, not only foam but also other conditioning agents need to be injected reduce the permeability of muck and avoid water spewing out screw conveyor. Permeability tests were carried study characteristics conditioned sand under high hydraulic gradients. A low bentonite slurry injection ratio (BIR) enhanced workability foam-conditi...

In practice, asymmetric formation disturbance occurs due to the sequence of excavation though parallel double-track tunnel is a typical symmetrical engineering. Based on shield tunneling project section Suzhou Rail Transit under subgrade Shanghai–Nanjing Expressway, finite element model was established obtain numerical solution that validated by measured data guarantee reliability. According co...

This paper presents a study on the influence of construction an ultralarge-diameter shield tunnel undercrossing existing high-speed railway using empirical method, numerical analysis and geotechnical centrifuge model experiment based Wuhan Lianghu Highway Tunnel project. The comparison results obtained from three methods shows first, that simulation match well with method for worst-case scenari...

In response to the sustainable development goal of agriculture put forward by United Nations, countries have introduced a series agricultural environmental protection policies. However, effectiveness these policies has been hindered insufficient responses from farmers. This study begins with fundamental logic farmers’ production behavior and first introduces family place identities into theoret...