Measuring method of in-situ stress of rock mass and measuring method of tensile strength uniformity
A measurement method and tensile strength technology, applied in the field of rock mass geostress measurement method and tensile strength uniformity measurement, can solve the problems of difficulty in accurate identification of closure pressure and tension pressure, inaccurate determination of principal stress direction, etc.
Active Publication Date: 2021-08-03
CENT SOUTH UNIV
View PDF20 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Among them, hydraulic fracturing is the most accurate method for measuring in-situ stress, but hydraulic fracturing has problems such as the difficulty in accurately identifying closure pressure and tensional pressure, and inaccurate determination of the principal stress direction.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0046] This ground stress measuring method disclosed in the present embodiment is specifically as follows:
[0047] Step 1. Fabricate the fracturing device 1. The fracturing device 1 includes a fracturing disc 11 and a hydraulic cylinder 12; Relatively arranged to form a fracturing ring, the splicing surface of the two fracturing discs is the fracturing direction; a pair of hydraulic cylinders are placed side by side in the fracturing ring, the piston end is connected to the same fracturing disc, and the cylinder end is connected to the other The fracturing discs are connected, and the two hydraulic cylinders are connected to the same hydraulic station, which can be driven by the same hydraulic station to ensure synchronous expansion and contraction.
[0048] Step 2: Pre-construct a horizontal borehole 3 at the position of the rock mass 2 where the ground stress is to be measured, the inner diameter of which is slightly larger than the outer diameter of the fracturing device, ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for measuring ground stress of a rock mass and a method for measuring the uniformity of tensile strength. In the ground stress measuring method, a horizontal borehole is constructed at the test position, and then several fracturing devices are placed in the horizontal borehole, and each fracturing The fracturing direction of the device is different, and then control each fracturing device to work sequentially from the inside of the hole to the outside of the hole, fracturing the rock mass, and record the applied pressure; then according to the opening pressure recorded when the cracks of each fracturing device are opened in the horizontal drilling Solve the horizontal principal stress, vertical principal stress and horizontal principal stress direction; then construct vertical drilling at the test position; finally repeat fracturing to measure the minimum horizontal principal stress, maximum horizontal principal stress and minimum horizontal principal stress in the plane perpendicular to the drilling direction The direction of the horizontal principal stress. It only needs to be placed once to measure the pressure in the hole required for multiple directions of fracturing, avoiding the measurement error caused by multiple placement devices; the fracturing position of the rock mass in the hole can be preset and flexibly controlled, which improves the orientation of the measurement sex and pertinence.
Description
technical field [0001] The invention belongs to the technical fields of geomechanics, rock mechanics and engineering, and in particular relates to a method for measuring in-situ stress of a rock mass and a method for measuring the uniformity of tensile strength. Background technique [0002] Rock is the material on the surface of the earth. During the long geological time, due to geological tectonic movement and other reasons, the crustal material has an internal stress effect, which is called in-situ stress. The stress activity in the crust is the reason for the crust to overcome resistance and continue to move and develop; all deformations in the crust, such as folds and fractures, are the result of the action of ground stress. [0003] In-situ stress is the fundamental force that causes deformation and destruction of various underground or open-pit rock excavation projects. Therefore, the determination of in-situ stress is a necessary prerequisite for determining the mec...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/02G01N3/12G01N3/08
CPCG01N3/02G01N3/08G01N3/12
Inventor 王少锋景岳李夕兵孙立成唐宇
Owner CENT SOUTH UNIV