CN-121994609-A - Device and method for actively monitoring in-situ multi-field performance of filling body and testing age-separated mechanics

CN121994609ACN 121994609 ACN121994609 ACN 121994609ACN-121994609-A

Abstract

The invention discloses an in-situ multi-field performance active monitoring and age-based mechanical testing device for a filling body, and relates to the technical field of in-situ tests and monitoring of mine filling engineering. The device comprises a device main body, a sample forming die array, a multi-field environment communication structure, an in-situ multi-field monitoring system and an age-divided mechanical testing system, wherein the device main body is used for being immersed in underground filling slurry, the sample forming die array is used for containing filling slurry in the same batch with underground to form filling body samples, the multi-field environment communication structure is used for enabling the filling slurry to be communicated with an external filling body in a thermal, water, force and chemical field mode, the in-situ multi-field monitoring system is used for synchronously monitoring a plurality of environmental parameters of the external filling body, and the age-divided mechanical testing system is used for carrying out in-situ uniaxial compression tests on the filling body samples in different curing ages. According to the invention, under the premise that the underground and the external filling body are kept in thermal-water-force-chemical communication and the pore pressure transmission condition is established, the sample curing maintenance is carried out, the demoulding can be completed in the same device without artificial coring/block taking, and the mechanical data such as single-axis compression and the like can be obtained in batches according to age.

Inventors

LIU LIYUAN
WANG TAO
LI YUNJIE

Assignees

北京科技大学

Dates

Publication Date: 20260508
Application Date: 20260320

Claims (10)

1. The utility model provides a pack body normal position multi-field performance initiative monitoring and age mechanical testing device which characterized in that includes: the device body is used for being immersed in the underground filling slurry; the sample forming die array is arranged in the device main body and is used for accommodating filling slurry in the same batch with the underground to form a filling body sample; the multi-field environment communication structure is arranged on the device main body and used for enabling filling slurry in the sample forming die array to be communicated with external filling bodies in a thermal, water, force and chemical field mode, wherein the multi-field environment communication structure comprises a permeable film, a transmission hole and a plurality of control units, wherein the permeable film is arranged on a circular boss which is arranged on the bottom shell of the device main body and has the same cross section size as the sample forming die, and the permeable film allows water molecules and ions to pass through; The in-situ multi-field monitoring system is arranged on the device main body and is used for synchronously monitoring a plurality of environmental parameters of the external filling body; The device comprises a device main body, an age-classified mechanical testing system, a small single-shaft compression device and a pressure sensor, wherein the age-classified mechanical testing system is arranged inside the device main body and is used for carrying out in-situ single-shaft compression tests on filling body samples in different curing ages, the age-classified mechanical testing system is provided with the small single-shaft compression device, the small single-shaft compression device comprises a compression rod, a driving unit for driving the compression rod to axially move and the pressure sensor for measuring pressure, and the age-classified mechanical testing system is used for simultaneously realizing filling body sample demoulding and single-shaft compression tests on the filling body samples in the same compression rod stroke.
2. The device for actively monitoring the in-situ multi-field performance and the age-based mechanical testing of the filling body according to claim 1 is characterized in that the whole device body is in a cube shape, structural reinforcing ribs are arranged on the outer surface of the device body, and the sample forming die array is a regular array of M multiplied by M, wherein M is a positive integer.
3. The device for actively monitoring the in-situ multi-field performance of the filling body and testing the age-related mechanics according to claim 1, wherein the age-related mechanics testing system further comprises an XY two-axis moving and positioning mechanism which is arranged at the upper side of the inside of the device main body; The small single-shaft compression device is fixedly connected with the XY two-shaft moving and positioning mechanism and can move to the position above any one of the dies in the sample forming die array through the XY two-shaft moving and positioning mechanism.
4. The device for actively monitoring and testing the in-situ multi-field performance of the filling body according to claim 1, wherein the driving unit comprises a hydraulic pump, a pressurizing oil pipe, a back-pressure oil pipe, a supporting gasket, a supporting rod and a compression sleeve, The hydraulic pump is fixedly arranged on the side surface of the device main body and is connected with the compression sleeve through a pressurizing oil pipe and a back-pressure oil pipe; The compression sleeve is fixedly connected with the XY two-axis moving and positioning mechanism; The compression rod is connected with the compression sleeve in a coaxial way, and the hydraulic pump controls the compression rod to stretch and retract through pressurization and pressure relief, so that demolding, uniaxial compression and pressure relief operations can be completed simultaneously; the other end face of the compression sleeve is fixedly provided with the supporting rod, the supporting rod is fixedly connected with the supporting gasket, the supporting gasket is in direct contact with the device main body shell, and lubricating oil is smeared between the supporting gasket and the device main body shell.
5. The device for actively monitoring the in-situ multi-field performance and the age-based mechanical testing of the filling body according to claim 1, wherein the sample forming die is composed of two separable shells in a butt joint mode, the two shells are locked and fixed on the bottom shell of the main body of the device through a locking mechanism, the locking mechanism is made of shape memory metal, and the austenite finishing temperature of the locking mechanism is higher than the highest temperature of the hydration process of the filling body.
6. The device for actively monitoring and testing the in-situ multi-field performance of the filling body according to claim 5, wherein the locking mechanism comprises a first locking buckle and a second locking buckle which are provided with magnetic guiding sheets; the two sides of the sample forming die are symmetrically provided with 4 lug plates, and the lug plates of the two shells are locked through the first lock catch, so that the two separable shells are formed into a whole; The lower part of the outer side of the sample forming die and the lower part of the round boss are respectively provided with a groove, and the sample forming die is fixed on the bottom shell of the device main body through the second lock catch.
7. The device for actively monitoring and testing the in-situ multi-field performance of the filler according to claim 6, further comprising a heating unit for selectively heating the locking mechanism to unlock the locking mechanism; The device is characterized in that an N multiplied by N array compartment is arranged in the device main body, N is a positive integer and used for accommodating the sample forming die, and strong magnets are fixedly arranged on the opposite inner walls of the compartment and used for absorbing and fixing the first lock catch and the second lock catch after the first lock catch and the second lock catch are unlocked and the two shells are separated.
8. The device for actively monitoring and testing the in-situ multi-field performance of the filling body according to claim 1, wherein the lower end of the pressure rod and the upper end of the sample forming die are respectively provided with a chamfer matched with each other, so that when the pressure rod contacts the sample forming die downwards, the generated axial pressure can decompose a lateral component force to promote the sample forming die to separate so as to be demolded, and meanwhile, the pressure rod can continuously load the filling body sample downwards to perform a uniaxial compression test.
9. The device for actively monitoring the in-situ multi-field performance and the age-based mechanical testing of the filling body according to claim 1, further comprising a visual monitoring unit, wherein the visual monitoring unit is fixed on the age-based mechanical testing system and is used for recording the damage form of the filling body sample in the uniaxial compression test process.
10. A testing method based on the in-situ multi-field performance active monitoring and age-based mechanical testing device of the filler according to any one of claims 1 to 9, characterized in that it comprises the following steps: Immersing the device main body in filling slurry to be measured underground; Through the multi-field environment communication structure, filling slurry in the sample forming die and an external filling body are synchronously solidified in a multi-field environment; Continuously collecting a plurality of environmental parameters of the external filling body through the in-situ multi-field monitoring system; Dividing the filling body samples molded by the sample molding die into a plurality of groups, wherein each group of filling body samples is not less than 3 so as to reduce errors, setting each group to be in different curing ages, operating the mechanical testing system in each curing age when reaching the preset curing age, and carrying out in-situ demolding and uniaxial compression test on the corresponding filling body samples to obtain mechanical performance parameters in the curing age; and establishing and analyzing association relations between the environmental parameters and the mechanical property parameters under different ages.

Description

Device and method for actively monitoring in-situ multi-field performance of filling body and testing age-separated mechanics Technical Field The invention relates to the technical field of in-situ test and monitoring of mine filling engineering, in particular to an in-situ multi-field performance active monitoring and age-based mechanical testing device and method for a filling body. Background With the development of mine toward deep mining, goaf filling, stope stoping and surrounding rock stable control have higher requirements on early and long-term performance of the filling body. After underground pouring, the strength, deformation, permeation and other engineering properties of the filling body (such as cementing filling slurry, cementing paste filling and the like) are not evolved under the action of a single factor, but are controlled by multiple fields of temperature-hydraulic-mechanical-chemical together, for example, the hydration and heat release of a cement-based cementing material lead to the change of a temperature field, the temperature in turn influences the hydration rate and the pore structure, and the effective stress and the structural densification are influenced by the pore water pressure and the seepage process. Thus, the evolution of the properties of the filler curing process has significant time-variability and spatial non-uniformity, and must be characterized and evaluated in a multi-field environment. The existing engineering mainly relies on two modes of acquiring the solidification performance of the filling body, namely, a laboratory uniaxial compression test after manual coring/blocking to acquire parameters such as compressive strength at different ages, and the like, and a underground embedded sensor to perform single-field or small-field monitoring (such as temperature, stress, pore pressure, and the like). However, the method has the common defects that the sampling and recovering process often causes disturbance to the sample, the sampling position, the sampling time and the underground actual solidification environment are difficult to be completely consistent, the mechanical property evolution of the filling body under the underground multi-field effect is difficult to be truly reflected, continuous data can be obtained by simply monitoring by a sensor, but the mapping relation between the monitored quantity and the mechanical property is greatly influenced by the proportion, the temperature gradient, the pore pressure condition and the chemical environment difference, and the strength and the deformation parameter of the filling body are difficult to be reliably inverted. Meanwhile, the existing laboratory maintenance and multi-field coupling test device generally simulates temperature and humidity or pressure conditions in a controlled container, but still is difficult to meet the requirements of (1) slurry and solidification process in the same batch with underground, (2) pore water pressure and ion exchange communication with an external filling body, (3) demolding and in-situ acquisition of mechanical parameters in the different ages can be realized in the same device without artificial coring/blocking, and (4) structural sealing, anti-blocking, anti-abrasion and long-term stable operation are maintained in the measuring process. Therefore, deviation often exists between a laboratory simulation result and an underground actual working condition, so that high credibility basis is lacked in quality evaluation, support/stoping time judgment and safety risk early warning of the filler curing process. In view of the foregoing, there is a strong need for an apparatus and method for in-situ testing and multi-parameter continuous monitoring in a multi-field environment during curing of a downhole filler. Disclosure of Invention The invention aims to solve the problem that the performance acquisition means of the existing mine filling body curing process is difficult to truly reflect the influence of underground multi-field environments. Therefore, the invention provides an in-situ multi-field performance active monitoring and age-based mechanical testing device and method for a filling body, which can carry out sample curing maintenance on the premise that the underground and external filling bodies are kept in thermal-water-force-chemical communication and a pore pressure transmission condition is established, can finish demolding in the same device without manual coring/block taking, can acquire mechanical data such as single-shaft compression in batches according to the age, and synchronously acquire parameters such as temperature, stress, pore water pressure, pH, resistivity and the like, so that more reliable in-situ characterization and evaluation of the performance evolution of the filling body curing process are realized. In addition, the device can form standardized samples under the condition that the films and the transmission holes are communicated with an e