十字板剪切试验

null十字板剪切试验十字板剪切试验Testing equipment Testing equipment includes: 1、punding host 2、cross plate splot null Testing equipment： Testing equipment includes: 1、punding host 2、cross plate splot 3、 purpose torsion sensor 4、mesurement torsion instrument 5、machine which apply torsion and other assistant equipmentnull Picture14-1 principle of the vane shear test a） cross plate leaf b）cylinder soil body made by cross plate leafnullSpecification of the cross plate: the high rectangle the rectangle the dwarfing rectangle the diamond nullPlate width Plate heightPlate thickness Edge angleAxle diametreArea rationullNow there are two kinds of the cross plate shear instrument: the open steel ring type and the electric measurement type. 1、The open steel ring cross shearing instrument can also be called the mechanical type cross type shearing instrument.It is a cross plate head which use rotating worm wheel to insert in the soil layers and measure the resistance moment by open steel ring which can be used to calculate the shear strength of the soil.null2、The main difference between the elastic measurement cross shearing instrument and the open steel ring ones is that they have different force measuring equipment.the It use resistance strain gauge 、digital force measurement unit and electronic potentiometer to measure the shear torsion moment . It has been proved that the elastic measurement cross shearing instrument is portable flexible and easy operation the result of the experiment is stable too.nullnullThe main point of the experiment : 1、For the open steel ring cross shearing instrument ,the steel ring should be checked twice a year. 2、 For the elastic measurement cross shearing instrument checking the sensor.nullThe application of the vane shear strenth in engineering: 1、Measuring the sensitivity of the saturated clay. 2、Comfirming the location of the sliding surface in the slope or foundation. 3、Measuring the change law of the foundation strenth.