A waterproof side leakage device for multi-field coupling test specimens

Abstract

The invention discloses a waterproof side leakage device for a multi-field coupling test specimen, which comprises an upper water hole pressure plate, a lower water hole pressure plate, an inner thermoplastic pipe and an outer thermoplastic pipe, and the upper water hole pressure plate and the lower water hole pressure plate have the same shape , the pressure plate of the upper water hole is buckled upside down on the top of the rock test piece, the pressure plate of the lower water hole is supported upwards on the bottom of the rock test piece, the inner thermoplastic tube is sleeved in the middle of the rock test piece, and the hygroscopic resistor is installed on the inner thermoplastic tube. The outer thermoplastic tube wraps the entire rock specimen and the top of the pressure plate of the upper water hole and the pressure plate of the lower water hole. The wrapped area of ​​the outer thermoplastic tube, the pressure plate of the upper water hole and the pressure plate of the lower water hole is wrapped with tape, and the outside of the tape is covered with iron wire , the outer surface of the outer thermoplastic pipe is provided with an axial displacement extensometer and a circumferential displacement extensometer. The invention adopts the inner thermoplastic tube and the outer thermoplastic tube to seal the entire side leakage device, realizes the complete sealing of the test piece, prevents the intermixing of pore water and silicone oil, and ensures the stability of the confining pressure and osmotic pressure loading system.

Description

technical field [0001] The invention relates to the technical field of geology, and relates to a waterproof side leakage device for a multi-field coupling test specimen. Background technique [0002] Jointed and fractured rock mass is an engineering medium widely encountered in hydraulic engineering, transportation engineering, mining engineering, oil exploitation, underground tunnel engineering, nuclear waste underground deep burial engineering, national defense underground construction engineering, etc. Different temperatures and seepage pressure differences and surrounding rock stress have an important influence on the deformation and seepage characteristics of the fractured rock mass. The seepage mechanics and deformation characteristics of the fractured rock mass are understood through the rock temperature-seepage-stress coupling experiment. Construction provides an important basis. [0003] Engineering rock mass is generally in a state of triaxial stress. Therefore, s...

AI Technical Summary

Problems solved by technology

Conventional triaxial tests are commonly used at present, but the defects of traditional devices: (1) Since there is no unified rock temperature-seepage-stress coupling test standard, the rock stress test standard is generally used to seal the test piece

(2) Traditional devices are either simple or cumbersome, very inconvenient to operate, and the test data is distorted, not suitable for large-scale and stable production and application

(3) The outstanding problem of the traditional device is that when it is used in the penetration-stress coupling experiment, the problem of the tight sealing of the thermoplastic tube will appear

When a higher osmotic pressure is applied, the water flow overflows from the upper contact surface between the pressure plate of the upper water hole and the test piece, and is directly mixed into the silicone oil, resulting in instability of confining pressure, distortion of osmotic pressure and waste of silicone oil

Due to the huge osmotic pressure difference, the water flow can easily pass through the side gap between the thermoplastic pipe and the specimen, forming a water flow path and causing the false seepage of the rock; rheological circular displacement distortion

Therefore, the current rock stress test specimen sealing standard is not suitable for studying the seepage characteristics of rock temperature-seepage-stress coupling test rocks.

(4) In addition, many experiments at present have not involved the research on the sealing device and method of rock specimens under different temperature conditions

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