Novel device for pseudo tri-axial creep of rock and earth engineering test block and using method of device

Abstract

The invention relates to a novel device for pseudo tri-axial creep of a rock and earth engineering test block and a using method of the device. The novel device comprises a plurality of surrounding steel plates which surround a rock-earth test block, wherein each surrounding steel plate is connected with a spring vertical compression device with adjustable pressure; a longitudinal loading device with adjustable pressure is arranged at the top part of the rock-earth test block; a pressure sensor is arranged between the spring vertical compression device and the surrounding steel plates; the pressure sensor and the loading device are connected with a control device; and the spring vertical compression device is connected with the longitudinal loading device. By adopting the novel device, a plurality of inconveniences in experiments in the prior art are avoided; and the spring pressure is simple, is easy to achieve and is convenient to adjust; through compressing the spring by a rotary screw, a large amount of complex mechanical control of the current devices are avoided, and therefore the experiment efficiency is greatly improved; the deformation in a creep process is relatively slow, the light error caused by the slight extension of the spring is avoided by adjusting the rotary screw in time, and therefore the experiment accuracy is guaranteed; and by adopting the pressure sensor, the creep ambient pressure is kept constant, and therefore the accuracy of a low-intensity pseudo tri-axial creep test is guaranteed.

Description

technical field [0001] The invention relates to a novel device for pseudo-triaxial creep of geotechnical engineering test block and its application method. Background technique [0002] Creep refers to the phenomenon that the strain of a solid material increases with time under the condition of keeping the stress constant. It is different from plastic deformation, which usually occurs after the stress exceeds the elastic limit, and creep can occur when the stress is less than the elastic limit, as long as the stress is applied for a long time. [0003] Creep phenomenon is very common in geotechnical engineering, and many geotechnical engineering disasters are also closely related to rock and soil creep, such as landslides, landslides, foundation settlements, etc. Important guarantee. [0004] At present, the creep phenomenon of rock and soil has been deeply studied at home and abroad, and corresponding experimental devices have emerged. Uniaxial creep experimental devices ...

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Problems solved by technology

[0004] At present, the creep phenomenon of rock and soil has been deeply studied at home and abroad, and corresponding experimental devices have emerged. Uniaxial creep experimental devices are more common, but they cannot accurately describe the actual stress state of the specimen. Triaxial experimental devices There are relatively few, such as hydraulic creep testing machines, pneumatic testing machines, etc., but most of them are suitable for the research of high-strength creep experiments. Although experiments on low-strength specimens can be carried out, the operation is too cumbersome and inefficient; Low-strength creep test devices are relatively rare. The experimental devices developed by predecessors are too complicated and fully electronically controlled. Although they basically meet the requirements of accuracy, there are major problems in experimental efficiency and experimental operation, and it is increasingly difficult to meet the requirements of geotechnical engineering. development needs

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