十字板剪切试验.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,十字板剪切试验,Testing equipment,Testing equipment includes:,1,、,punding host,2,、,cross plate splot,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 equipment,Picture14-1 principle of the vane shear test,a,）,cross plate leaf b,）,cylinder soil body made by cross plate leaf,Specification of the cross plate:,the,high,rectangle,the rectangle,the dwarfing rectangle,the diamond,Plate width,Plate height,Plate thickness,Edge angle,Axle diametre,Area ratio,Now there are two kinds of the cross plate,s,hear 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.,2,、,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.,The 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.,The 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.,