Numerical simulation of pressure-type anchor based on energy principle

According to the energy principle, the formulae for axial force and displacement are derived. The shear stress between grout and soil is computed by use of the elastic-plastic shear displacement model, and soil unloading because of large displacement is taken into consideration. An application method of the principle of the minimun potential energy in pressure-type anchor problem is presented. The solution to the energy equation is given. Through a case, the distribution of axial force, shear stress and displacement of pressure-type anchor under various load levels is analyzed, load-displacement curve is discussed, and the ultimate anchorage length is computed. The conclusion are: ① the pressure-type anchor is mainly in elastic state under most load levels, and it will soon reach the ultimate bearing capacity once it enters the plastic state; ② the anchorage body energy transfer theory, which takes soil unloading into consideration, gives an explanation of the ultimate anchorage length of pressure-type anchor.