8.5.1 With load as abscissa and settlement as ordinate, plot therelation curve of load and settlement and identify load characteristicvalue therein. If the curve has straight-line section and inflectionpoint, set the pressure corresponding to the terminal...[继续阅读]

    9.1.1 Pressurizing equipment: jack, piezometer, oil pump, highpressure oil pipe, etc.9.1.2 Shear box: square or round shape, the ratio between sidelength or diameter of shear box and the maximum particle size ofroller compacted mass should be no less than...[继续阅读]

    9.2.1 The number of specimens in each direct shear test shall be 4to 5. Spacing between specimens shall be no less than their sidelength or diameter. The same group test shall be performed within thesame test block.9.2.2 In specimen preparation, ensure no...[继续阅读]

    9.3.1 Place a base plate on the top surface of specimen. The baseplate shall have a size slightly less than the internal diameter or sidelength of shear box, and a height 3 cm to 5 cm higher than the upperedge of shear box. Level with a level ruler. In ca...[继续阅读]

    9.4.1 The vertical load should be applied according to arithmeticprogression or geometric progression respectively. The maximumvertical pressure should be 1.2 times of the design value.9.4.2 For specimen without consolidation requirement, applyvertical lo...[继续阅读]

    9.5.1 Adjust horizontal displacement meter and measure its initialreading. Whether the axis of horizontal jack needs to be adjusted shallbe determined by settlement.9.5.2 Apply horizontal shear load in 8 to 10 levels based on themaximum estimated shear lo...[继续阅读]

    9.6.1 Unload shear load first.9.6.2 Dismantle the vertical and horizontal displacement measuringdevices.9.6.3 Dismantle the horizontal load applying device.9.6.4 Unload vertical load and dismantle the vertical load applyingdevice.9.6.5 Dismantle the shear...[继续阅读]

    9.7.1 The vertical stress and shear stress are calculated by Equation(9.7.1-1) and Equation (9.7.1-2):Where:σ=vertical stress, kPa.p=total vertical load, kN.A=area of shearing surface of specimen, m2.τ=shear stress, kPa.Q=total shear load, kN.9.7.2 With h...[继续阅读]