Device for simulating and testing deformation of drill hole

• Main Authors: CAI GUANNAN, LOU QUAN, NIU YUE, LI ZHONGHUI
• Format: Patent
• Language: English
• Published: 10.06.2015
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PHYSICS; TESTING

A device for simulating and testing deformation of a drill hole comprises a simulation box internally provided with a material similar to a coal and rock mass and an upper press plate arranged on the simulation box; round holes are symmetrically formed in front and rear side plates of the simulation box; the round holes in the front and rear side plates are communicated by a drilling die to form a drill hole simulation environment. A capsule pressure sensor connected with a pressure guide pipe is arranged in the simulation drill hole and the outer end of the pressure guide pipe is connected with a one way valve and a pressure meter respectively by a tee. A testing method comprises the steps of feeding the capsule pressure sensor in the drill hole in the box body, applying stress to the drill hole, synchronously recording deformation of the drill hole and reading of the pressure meter, dynamically recording a deformation and development rule of the drill hole to obtain a change relation, and calculating the deformation of the drill hole by such actually tested capsule pressure. The device is simple in structure, easy to operate and good in simulation effect.