Measuring device and testing method for influence of local heating on adhesiveforce

Abstract

The invention discloses a measuring device and a testing method for influence of local heating on adhesive force, and the measuring device is together composed of a glass tube, a ring, a stop block, awooden frame, a miniature camera, a wiring plug, a sling, metal sheets, a thermally conductive post, a resistance wire, current clamps, current wires, current connectors, a soil body, a soil box, a power supply and a tension meter, wherein the metal sheets are arranged symmetrically at the bottom of the glass tube. Before the test, the current clamps of the two current wires are clamped on the resistance wire, the current connectors at the other ends of the current wires are connected to both poles of the power supply, and the change in adhesive force of the soil body is measured by locally heating the soil body by separating the glass tube from the soil body through the tensile force applied by the tension meter after a specific time of current. The device realizes the function of locally heating the soil body. The use of resistance wires as heating materials can facilitate the control of different heating times or heating intensities, which is an effective method to study the effectof local heating on the formation of mud cakes and the adhesive force to the soil body.

Description

technical field [0001] The invention belongs to the technical field of tunnel and underground engineering test instruments, in particular to a measuring device and a testing method for the influence of local heating on adhesion. Background technique [0002] In recent years, with the improvement of the economic level and the acceleration of the urbanization process, the shield construction technology in my country has gradually developed and matured. During the shield tunneling process of the shield machine, the cutter on the shield cutter head and the soil on the excavation surface continue to interact, which will generate a large amount of heat, which will be quickly transferred to the entire cutter head in the form of conduction. During the normal excavation process of the shield cutter head, the heat can be dissipated through the shield system or the surrounding soil, and will not have a great impact on the cutter head. However, with the advancement of the shield, the m...

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Problems solved by technology

However, the research on these adhesion measuring devices cannot effectively test the change of adhesion force under the influence of different heating times and heating intensities, nor does it involve the use of resistance wires to heat the bottom of special curved surfaces, and the use of energization time and energization intensity. Change the temperature, test the adhesion force value and the change rule of the adhesion force with the heating of the resistance wire under different heating times and heating intensities

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