CN-116804608-B - Triaxial coupling test active deformation testing device and testing method

CN116804608BCN 116804608 BCN116804608 BCN 116804608BCN-116804608-B

Abstract

The invention relates to an active deformation testing device and method for a triaxial coupling test, wherein the device comprises a rack, two cylindrical test cylinders, a confining pressure power mechanism and a hydraulic pump station are symmetrically arranged on the rack, flanges are respectively arranged at two ends of each test cylinder, the two test cylinders are detachably connected through the flanges, a sealed complete test cylinder is formed after the two test cylinders are in butt joint, and a displacement pressing mechanism is arranged at one end of each test cylinder. The testing device provided by the invention is an active deformation testing device which is filled interactively under the current deep mining conditions, namely, different confining pressure conditions, different water content conditions and different mediums. And (3) researching the fiber-soil coupling deformation mechanical characterization under the multi-medium replacement interaction condition through an active deformation test.

Inventors

XU SHIANG
ZHANG PINGSONG
WU HAIBO
HU HUAXUAN
YU HONGQING
YANG SHAOWEN
CHENG JINQUAN
SHI GUOJIE

Assignees

安徽理工大学

Dates

Publication Date: 20260512
Application Date: 20230329

Claims (9)

1. The active deformation testing device for the triaxial coupling test is characterized by comprising a frame, wherein a confining pressure power mechanism, a hydraulic pump station and two cylindrical test cylinders are arranged on the frame, the two test cylinders are symmetrically arranged, a first flange and a second flange are respectively arranged at two ends of each test cylinder, the two test cylinders are detachably connected through the second flange, a sealed complete test cylinder is formed after the two test cylinders are butted, the first flange is fixedly connected with a blind flange, a displacement pressing mechanism is fixedly arranged on the blind flange, the displacement pressing mechanism comprises a hydraulic cylinder fixedly arranged on the blind flange and a piston mechanism fixedly arranged at the end part of a telescopic rod of the hydraulic cylinder, the hydraulic cylinder is arranged on the outer side of the blind flange, a sealing ring is arranged between the piston mechanism and the inner wall of each test cylinder, through holes penetrating through test fibers are respectively formed in the blind flange and the piston mechanism, a sealing plug is arranged between the sealing plug and the test fibers, the hydraulic cylinder is connected with the hydraulic cylinder in a sealing way, the hydraulic cylinder comprises a hydraulic cylinder fixedly arranged on the blind flange and a water pump, and the displacement pressing mechanism comprises a water pump and at least one displacement sensing cylinder device arranged on the water pump; The piston mechanism comprises a mounting plate and a protective cover, wherein the mounting plate is fixedly arranged at the end part of the telescopic rod, two guide pulleys used for guiding the test optical fiber are fixedly arranged on the mounting plate, the two guide pulleys are a first guide pulley and a second guide pulley respectively, the protective cover is fixed on the mounting plate through bolts, the guide pulleys are arranged in the protective cover, and a plurality of O-shaped protective cover sealing rings are arranged on the side wall of the protective cover; When the test optical fiber is penetrated, the test optical fiber enters the inner side of the blind flange through the sealing plug on the blind flange, and then penetrates through the sealing plug, the second guide wheel and the first guide wheel on the mounting plate in turn around the telescopic rod, and then penetrates out of the sealing plug in the middle of the protective cover.
2. The triaxial coupling test active deformation testing device according to claim 1, wherein at least one test cylinder is provided with a drain valve.
3. The triaxial coupling test active deformation testing device according to claim 1, wherein at least one test cylinder is provided with an exhaust valve.
4. The device for testing the active deformation of the triaxial coupling test according to claim 3, wherein the filtering component for blocking the filling soil is fixedly arranged on the inner wall of the test cylinder corresponding to the exhaust valve.
5. The triaxial coupling test active deformation testing device is characterized in that the frame comprises a base, two test cylinder mounting seats are slidably arranged on the base, test cylinder fixing mechanisms are arranged on the test cylinder mounting seats, and turning mechanisms for enabling the test cylinders to turn over in horizontal positions and vertical positions are arranged in the test cylinder fixing mechanisms.
6. The device for testing the active deformation of the triaxial coupling test according to claim 5, wherein the turnover mechanism comprises a pneumatic telescopic rod, a fixed seat fixedly arranged on the test cylinder mounting seat and a test cylinder fixing frame with one end hinged on the fixed seat, one end of the pneumatic telescopic rod is hinged with the fixed seat, and the other end of the pneumatic telescopic rod is hinged with the test cylinder fixing frame.
7. The triaxial coupling test active deformation testing device according to claim 1, further comprising a blank holder, wherein the blank holder comprises two parallel circular partition boards, at least three support columns are fixedly arranged between the two partition boards, a through hole penetrating through a test optical fiber is formed in the center of the partition board, and the diameter of the partition board is matched with the inner diameter of the test cylinder barrel.
8. The triaxial coupling test active deformation testing device is characterized in that an annular groove is formed in the blind flange, a rubber sealing gasket is arranged in the annular groove, and an annular boss matched with the annular groove is arranged on the first flange of the test cylinder barrel.
9. The device for testing the active deformation of the triaxial coupling test according to claim 1, wherein the displacement sensing device is arranged in the hydraulic cylinder.

Description

Triaxial coupling test active deformation testing device and testing method Technical Field The patent relates to a device and a method for evaluating strain transmissibility of an optical fiber-soil body coupling test in the field of geology and rock soil. In particular to an active deformation testing device for a multi-parameter multi-medium interaction triaxial coupling test. Background The optical fiber testing technology is a perception testing technology which is raised in recent years and is widely popularized and applied, and particularly the distributed optical fiber testing technology plays an irreplaceable important role in the fields of landslide, ground subsidence, overburden damage, ancient building protection, large bridges, infrastructure and the like, and has the advantages of linear measurement and long-distance measurement. However, there is a troublesome problem in the application process of the optical fiber testing technology, namely, the tested object and the optical fiber cooperatively deform, and particularly, the coupling deformation of the rock-soil body and the optical fiber occurs. Because only when the deformation of the two is consistent, an accurate test result can be obtained through the optical fiber test, and the deformation condition of the tested object and the surrounding test environment condition are reflected, which is also a difficult problem for developing the optical fiber test. Many workers have also developed many experiments, developed different devices to test them, such as: in the research of optical fiber coupling and transmission consistency, most of optical cables are directly drawn to calibrate the strain coefficient, but the deformation content of the optical cables cannot be well characterized for medium coupling. (1) A drawing test device based on a ring cutter sample box is disclosed in test study of mechanical properties of a sensing optical fiber-sandy soil interface, and related test study is completed by changing an overlying weight of a tester and adjusting the overlying pressure. (2) A sand tank coupling device is disclosed in a distributed sensing test study of the coupling performance of an optical fiber and sand soil interface, simulates the problem of the interface effect between the optical fiber and the soil body, and further studies the related transfer rule of the optical fiber-soil coupling under the drawing action. (3) The patent with the application number 201711431938.9 discloses a sensing optical cable and soil deformation coupling testing device which is used for testing the coupling effect of fiber-soil under different confining pressure conditions in an optical fiber drawing test. (4) The patent application numbers 201620526576.6 and 201910432429.0 disclose a soil mass distributed sensing optical cable and an upper interface mechanical property transparent test device, and the device realizes confining pressure adjustment by adding a counterweight on the upper part of a model. (5) The patent with the application number 202010660679.2 and the optical fiber-sand deformation coordination test research for ground subsidence monitoring disclose a direct-buried sensing optical cable and soil deformation coordination device which consists of a pressure chamber, a loading rod, a pressure cap, a water filling valve, a water draining pipe and the like, and can realize the coupling test of a small-size sample and an optical fiber measuring line. (6) A controllable confining pressure optical cable-soil body interaction characteristic test device is disclosed in drilling backfill and direct-buried strain sensing optical cable coupling research, and optical cable-soil body interface coupling test and research under the drawing condition are carried out. (7) Patent application number 202020004728.2 discloses a temperature control optical fiber-soil body drawing test device, which can obtain differential data of optical fiber-soil body interface mechanical properties under different temperature conditions. The fiber-soil body coupling evaluation test is carried out through the test and the device, a certain result is obtained, and the reliability of test data is verified. The simulation device is simple in structure, poor in adaptability to rock and soil parameters, capable of only meeting the requirement of partial rock and soil test, small in model scale, simple in simulation environment simulation, multiple in parameter acquisition, multiple in auxiliary form, and low in integrated cooperative data, and is difficult to realize high-confining pressure dynamic sectional test due to limitations of device scale, device tightness and a power system, errors exist in test results, and devices and equipment for driving optical fiber deformation by soil deformation are few. The simulation environment parameters are dispersed, different sensors are needed to be additionally arranged outside the device manually, data acquisition is asynchronous, a smal