Series of probes for measuring undrained shear strength of soft clay and test method

The invention provides a series of probes for measuring undrained shear strength of soft clay. Each probe comprises a traction part and a cone head main body part. The probes are characterized in that the cone head main body parts are divided into a conical cone head, a spherical cone head and a solid cylindrical cone head according to the shape of the cone head main body part, and depth scales are arranged on the side walls of the three cone heads. Specifically, the total weight of the conical cone head is 60g, the taper angle is 60 degrees, and the height of the cone head is 25mm; the total weight of the spherical cone head is 60g, and the radius of the sphere is 22mm; and the total weight of the solid cylindrical cone head is 60g, and the radius of the solid cylinder is 22mm. The invention also provides a test method for measuring the undrained shear strength of soft clay by using the series of probes, and the test method is named as a drop cone method. The method has the advantages of being convenient in