CN-122016104-A - Rock disturbance stress monitoring device and method with rigidity matching characteristic

CN122016104ACN 122016104 ACN122016104 ACN 122016104ACN-122016104-A

Abstract

The invention discloses a rock disturbance stress monitoring device and method with rigidity matching characteristics, and relates to the technical field of rock disturbance stress monitoring, wherein the device comprises a strain gauge, a strain gauge framework, a flexible air film, a temperature sensor and a data acquisition module; the flexible air film is fixed in the strain gauge framework in a concave shape, the back surface of the strain gauge is adhered to the flexible air film, the temperature sensor is adhered to the flexible air film and is close to the position of the strain gauge, the surface of the flexible air film is adhered with an adhesive material, the adhesive material is determined according to the elastic modulus of a rock mass to be measured, and the data acquisition module is electrically connected with the strain gauge and the temperature sensor. The invention relieves the technical problem of unmatched rigidity of the strain gauge and the rock in the prior art, and can accurately and effectively transfer rock disturbance stress to the monitoring element on the premise of ensuring that surrounding rock drilling does not collapse or deform greatly by selecting proper bonding materials and flexible media and matching with continuous support of a flexible air film.

Inventors

LI YUAN
MA HONGSU
LI DONGYUE
LI PENG
WANG CHUNXIAO
Luan Yawei
ZHOU JIAHAO
GUO YUANLONG
LI SHIQI
Zhao xingguang

Assignees

北京科技大学
核工业北京地质研究院

Dates

Publication Date: 20260512
Application Date: 20260128

Claims (10)

1. A rock disturbance stress monitoring device with rigidity matching characteristics is characterized by comprising a strain flower, a strain gauge framework, a flexible air film, a temperature sensor and a data acquisition module, wherein, The flexible air film is fixed inside the strain gauge framework in a concave shape, and is extruded outside the strain gauge framework after being inflated by filling flexible medium; the back surface of the strain gauge is stuck to the flexible air film, and the temperature sensor is stuck to the flexible air film and is close to the position of the strain gauge; the surface of the flexible air film is attached with an adhesive material, and the adhesive material is determined according to the elastic modulus of the rock mass to be measured; the data acquisition module is electrically connected with the strain gauge and the temperature sensor.
2. The rock mass disturbance stress monitoring device with the rigidity matching characteristic according to claim 1, wherein the ratio of the elastic modulus of the bonding material after solidification to the elastic modulus of the rock mass to be measured is 1/20-1/10.
3. The rock mass disturbance stress monitoring device with stiffness matching characteristics according to claim 1, wherein the bonding material comprises epoxy glue, flexible modified epoxy glue and polyurethane glue; When the elastic modulus of the rock mass to be measured is larger than a preset threshold value, the bonding material is the epoxy resin glue; And when the elastic modulus of the rock mass to be measured is smaller than or equal to the preset threshold value, the bonding material is the flexible modified epoxy glue or the polyurethane glue.
4. The rock mass disturbance stress monitoring device with rigidity matching characteristics according to claim 1, wherein the number of the strain flowers is plural, and the plurality of the strain flowers are distributed at equal intervals along the circumferential direction in the middle of the flexible air film; Each of the strain relief includes a plurality of differently angled strain gages.
5. The rock mass disturbance stress monitoring device with the rigidity matching characteristic according to claim 1, wherein one end of the strain gauge framework is provided with a positioning bolt and a hanging needle, The hanging needle is used for determining the rotation angle of the strain gauge framework; the positioning bolt is used for adjusting the installation direction of the rock mass disturbance stress monitoring device with the rigidity matching characteristic.
6. The rock mass disturbance stress monitoring device with stiffness matching characteristics according to claim 1, wherein a glue storage chamber is arranged inside the strain gauge skeleton, and the bonding material is stored in the glue storage chamber.
7. The rock mass disturbance stress monitoring device with the rigidity matching characteristic according to claim 1, wherein a valve is arranged at the filling port of the flexible air film; The flexible medium filled in the flexible air film comprises water or air.
8. The rock mass disturbance stress monitoring device with stiffness matching characteristics according to claim 1, wherein a plurality of lead holes are circumferentially equally spaced on the outer sidewall of the strain gauge skeleton, each lead hole passing through a corresponding strain-gauge wire.
9. A method of monitoring a rock mass disturbance stress monitoring device having stiffness matching characteristics according to any one of claims 1 to 8, the method comprising: drilling holes at points to be monitored on a rock mass to be tested, and taking out drill cores; Sticking a strain gauge on a drilling core of an installation point of the device, and placing the drilling core into an incubator for temperature calibration to obtain temperature compensation data; Measuring the elastic modulus of the drill core, and determining a bonding material based on the elastic modulus; Filling the adhesive material into a glue storage chamber of the strain gauge framework, and sending the rock disturbance stress monitoring device with the rigidity matching characteristic to a device installation point through an installation rod; Rotating the mounting rod according to the state of the hanging needle, ensuring that the mounting angle of the rock disturbance stress monitoring device with the rigidity matching characteristic is consistent with a preset mounting angle, and filling flexible medium into the flexible air film to enable the flexible air film to expand and extrude and cling to the inner wall of the drill hole at the point to be monitored; And collecting monitoring data after the bonding material is solidified, wherein the monitoring process always maintains a flexible gas film supporting structure filled with a flexible medium, and corrects the monitoring data based on the temperature compensation data to obtain disturbance stress of the rock mass to be measured, and the monitoring data comprises temperature data and stress data.
10. The method of claim 9, wherein the bonding material comprises an epoxy glue, a flexible modified epoxy glue, and a polyurethane glue, wherein determining the bonding material based on the modulus of elasticity comprises: When the elastic modulus is larger than a preset threshold value, determining that the bonding material is the epoxy resin adhesive; and when the elastic modulus is smaller than or equal to the preset threshold value, determining that the bonding material is the flexible modified epoxy adhesive or the polyurethane adhesive.

Description

Rock disturbance stress monitoring device and method with rigidity matching characteristic Technical Field The invention relates to the technical field of rock disturbance stress monitoring, in particular to a rock disturbance stress monitoring device and method with rigidity matching characteristics. Background Disturbance stress is a cause of damage and instability of underground engineering rock mass, and although the stress measurement and monitoring technology for rock mass at home and abroad is relatively mature at present, the rock stress monitoring method commonly used at present comprises a hollow inclusion strain gauge, a borehole stress meter, a fiber grating and the like, in the actual measurement process, the strain gauge can limit deformation of the rock due to mismatching with the rigidity of the rock, so that the measurement precision is affected. The fiber bragg grating is high in price, so that the monitoring cost of disturbance stress with fewer measuring points is low. Disclosure of Invention In order to solve the technical problems in the prior art, the embodiment of the invention provides a rock disturbance stress monitoring device and method with rigidity matching characteristics. The technical scheme is as follows: The rock mass disturbance stress monitoring device with the rigidity matching characteristic comprises a strain flower, a strain gauge framework, a flexible air film, a temperature sensor and a data acquisition module, wherein the flexible air film is fixed inside the strain gauge framework in a concave shape, flexible medium is filled in the flexible air film and expanded, the flexible air film is extruded out of the strain gauge framework, the back surface of the strain flower is adhered to the flexible air film, the temperature sensor is adhered to the flexible air film and is close to the position of the strain flower, an adhesive material is adhered to the surface of the flexible air film, the adhesive material is determined according to the elastic modulus of a rock mass to be measured, and the data acquisition module is connected with the strain flower and the temperature sensor through a cable. Optionally, the ratio of the elastic modulus of the bonding material after curing to the elastic modulus of the rock mass to be measured is 1/20-1/10. Optionally, the bonding material comprises epoxy resin glue, flexible modified epoxy glue and polyurethane glue, wherein when the elastic modulus of the rock mass to be tested is greater than a preset threshold value, the bonding material is the epoxy resin glue, and when the elastic modulus of the rock mass to be tested is less than or equal to the preset threshold value, the bonding material is the flexible modified epoxy glue or the polyurethane glue. Optionally, the number of the strain flowers is multiple, the strain flowers are distributed at equal intervals in the circumferential direction in the middle of the flexible air film, and each strain flower comprises a plurality of strain gauges with different angles. Optionally, one end of the strain gauge framework is provided with a positioning bolt and a hanging needle, wherein the hanging needle is used for determining the rotation angle of the strain gauge framework, and the positioning bolt is used for adjusting the installation direction of the rock disturbance stress monitoring device with the rigidity matching characteristic. Optionally, a glue storage chamber is arranged inside the strain gauge framework, and the bonding material is stored in the glue storage chamber. Optionally, a valve is arranged at the filling opening of the flexible air film, and the flexible medium filled in the flexible air film comprises water or air. Optionally, a plurality of lead holes are arranged on the outer side wall of the strain gauge framework at equal intervals along the circumferential direction, and each lead hole is penetrated by a corresponding lead wire of the strain gauge. On the other hand, the method comprises the steps of drilling holes in points to be monitored on a rock to be monitored, taking out drill cores, sticking strain flowers on the drill cores of the installation points of the device, placing the drill cores into a constant temperature box for temperature calibration to obtain temperature compensation data, measuring the elastic modulus of the drill cores, determining adhesive materials based on the elastic modulus, filling the adhesive materials into a rubber storage chamber of a strain gauge framework, sending the rock disturbance stress monitoring device with the rigidity matching characteristics to the installation points of the device through a mounting rod, coating the adhesive materials on the surface of a flexible air film by rotating the rock disturbance stress monitoring device with the rigidity matching characteristics, rotating the mounting rod according to the state of a hanging needle, guaranteeing that the installation angle of the rock disturba