Model parameters of conditioned soils in head chamber of shield machine are determined based on tri-axial compression tests in laboratory. The loads acting on tunneling face are estimated according to static earth pressure principle. Based on Duncan-Chang nonlinear elastic constitutive model, the earth pressures on head chamber of shield machine are simulated. The variation of earth pressure on...

The surface properties of fatty acid and fatty acid-alcohol mixtures were examined at 22-24 degrees C. At pH 12, sodium stearate forms a rigid surface film that generates an equilibrium spreading pressure of 16.5 dynes/cm. At pH 12, stearate-alkaline earth cation films collapse at the air-water interface and do not generate significant equilibrium spreading pressures. The rate of film collapse ...

Pressure-grouted helical pile (PGHP) is an innovative piling system that allows a significant increase in capacity with relatively low additional cost. The constructed by applying pressurized grout during the installation of conventional piles. injected into ground through two nozzles welded to hollow shaft. This paper presents comprehensive laboratory study investigate effect three different n...

Expanded polystyrene (EPS) geofoam is a lightweight compressible material that has been widely used in various civil engineering projects. One interesting application of EPS geotechnical to reduce the lateral earth pressure on rigid non-yielding retaining walls. The nature allows for shear strength backfill soil be mobilized, which leads reduction acting wall. In this study, finite element mode...

Shallow landslides on steep slopes often mobilize as debris flows. The size of the landslide controls the initial size of the debris flows, defines the sediment discharge to the channel network, affects rates and scales of landform development, and influences the relative hazard potential. Currently the common practice in digital terrain-based models is to set the landslide size equal to an arb...

A series of centrifuge tests was conducted to explore the earth pressures mobilised in loose and dense sand for a complete set active movement modes rigid retaining wall: rotation about base, translation top. Earth behind wall were measured by Tekscan pressure mapping system. This paper reveals that at all depths decrease simultaneously with while those shallow layers can increase linkage betwe...

The relationship of an AGN to its host galaxy is a crucial question in the study of galaxy evolution. We perform stellar population synthesis in the central regions of galaxies of different activity levels. A large number of stellar features are measured both in the optical and near-infrared. We find the nuclear stellar population to be related to the level of activity. These differences are no...