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direction of point D. The Rankine’s coefficient of lateral active earth pressure Ka is: (2) The vertical force dV at point D... of the coefficient of lateral active earth pressure Kawn is: (6) where is the average vertical stress and σawn is the active lateral stress. Figure 9 shows the stress state......
coatings were observed by using a JSM-5600LV SEM. 2.2 Principles The general solution for the complex coefficient of acoustic pressure at normal incidence to a single layer has been given as[19]  ... Ultrasonic characterization of modified Cr2O3 coatings by reflection coefficient spectroscopy LI Ji-cheng(李继承)1, LIN Li (林 莉)1, LI Xi-meng(李喜孟)1, LI Guang(李 光)2, LEI Ming-kai(雷明凯)3 1......
. Then, the crack angle that is most prone to hydraulic fracturing is determined. The relationships between crack direction and both lateral pressure coefficient and friction angle of the fracture surface... stationary lateral pressure coefficient is equal to 1.0. Under composite tensile-shear fracture, the crack parallel to the direction of the main stress is the most prone to hydraulic fracturing. Under......
; (7) Referring to Rankine’s theory, the coefficient (KD) of lateral earth pressure at the quasi-Rankine state... pressure; cohesionless soil 1 Introduction Retaining walls are mainly designed to resist lateral earth pressures. Traditionally, the forces acting on the wall are typically determined by using......
, the lateral active earth pressure on the tunnel face decreases rapidly to a residual value, and the lateral pressure distribution can be categorized into three stages during the failure process: 1... pressure for face stability usually appears at δ/D=0.2%-0.5% (ratio of face displacement to tunnel diameter). Key words: face stability; trap-door test; lateral earth pressure; failure zone; soil arching......
Effects of lubricant’s friction coefficient on warm compaction powder metallurgy LI Yuan-yuan(李元元), NGAI Tungwai Leo(倪东惠), WANG Shang-lin(王尚林), ZHU Min(朱 敏), CHEN Wei-ping(陈维平) (College... produce different lubrication effects and their optimal application temperature will be different. Three different lubricants were used to study the effects of friction coefficient on warm compaction......
the microscopic view. Based on the DEM, the influence of granule diameter, surface friction coefficient, normal pressure and shear velocity on the internal friction coefficient of the granular system were studied.... 4(a). As can be seen, when a certain normal pressure is applied on the granule sample, with the shear proceeding, the internal friction coefficient gradually increases from zero, and the variation......
that the vertical effective consolidation pressure on soil sample was and the static lateral pressure coefficient was K0, the effective consolidation confining pressure would be . The sample...) where k is a correction coefficient and reflects the influence degree of the equivalent dynamic stress level on the pore water pressure at the first cycle; k3 is a coefficient representing......
buckling of the pipelines under high temperature and pressure. The factors influencing the lateral buckling of pipelines are further studied. Based upon some actual engineering projects, the finite element...Global lateral buckling analysis of idealized subsea pipelinesLIU Run(刘润)1, LIU Wen-bin(刘文彬)1 , WU Xin-li(吴新利)2, YAN Shu-wang(闫澍旺)1(1. State Key Laboratory of Hydraulic Engineering Simulation......
direction and vertical, h is the tunnel height, B is the tunnel span, and λ is the lateral pressure coefficient. Thus, the vertical support pressure can be obtained as: (4) (5) (6) The horizontal support pressure can be obtained as: (7) (8) (9) (10) The lateral pressure coefficient can be obtained as: (11) 3.2.2 Analysis of rock mass class In order to eliminate the influence of tunnel......