TESTING RESEARCH ON THE STRUCTURAL CHARACTERISTICS OF A TYPE OF STEEL STRUCTURE OF COMPRESSIBLE LINING JOINT FOR SHAFTS

According to the fracture mechanism of the linings acted on by negative friction in a drilled shaft, a type of compressible lining joint installation, with a ring plate adding to rib plates, is presented. The physical simulation tests of this installation were finished under uniaxial and triaxial compression. The compressing characteristics, the vertical critical load, and the acting behavior between ring plate and rib plates were investigated. The test results prove that this kind of installation is of good waterproofing, and can unload vertical stress in shaft linings and then prevent the shaft lining fracture. Some opinions on the design methods and the values of parameters of this compressible joint are also put forward.