Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for measuring ground stress by using rock core hysteretic elasticity recovery deformation

A technology of hysteretic elastic deformation and recovery of deformation, applied in the field of geological exploration, can solve the problems such as the difficulty of lowering the packer to the test section and the inability to implement the hydraulic fracturing method, achieving low cost, strong adaptability and strong adaptability Effect

Inactive Publication Date: 2020-12-25
CHINA RAILWAY ERYUAN ENG GRP CO LTD
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnitude and direction of in-situ stress can only be obtained through in-situ testing. At present, the most widely used methods include in-situ stress measurement by hydraulic fracturing method and in-situ stress measurement by stress relief method. Both methods have certain limitations. During the fracturing test, the packer is required to isolate the test section, so for ultra-deep holes and broken holes, it is difficult to lower the packer to the test section, making it impossible to implement the hydraulic fracturing method; while the stress relief method requires Drill holes to install strain gauges at the test site, so it is mostly used in construction projects

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for measuring ground stress by using rock core hysteretic elasticity recovery deformation
  • Method for measuring ground stress by using rock core hysteretic elasticity recovery deformation
  • Method for measuring ground stress by using rock core hysteretic elasticity recovery deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0120] (1) Introduction to Surveying Engineering

[0121] Coring depth: 890.3m-891m (vertical hole)

[0122] Coring length: 70 cm

[0123] Coring diameter: 47mm

[0124] (2) On-site collection of anelastic strain data

[0125] The duration of on-site collection and test of the time-sensitive strain of the core at the X measuring point is about 5-7 days. The time-sensitive strain data of the field core can be collected and stored by using the time-sensitive strain collector, and the time-sensitive strain data of each collector can be extracted for analysis and processing. Time-dependent strain-time curves, such as Figure 5 shown. The change trend of anelastic strain with time is basically consistent. After the core is lifted from the in-situ state, the time-dependent strain changes rapidly at the initial stage, and basically remains unchanged in the later stage of the test. The time-dependent strain reaches a stable peak within 3-7 days.

[0126] After the core is transpo...

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

No PUM Login to View More

Abstract

The invention provides a method for measuring ground stress by using rock core hysteretic elasticity recovery deformation. The method is used for effectively obtaining reliable ground stress data, andis higher in adaptability and efficiency. The method comprises the following steps of rock core drilling, strain gauge pasting, hysteretic elasticity deformation strain testing, temperature calibration, hysteretic elasticity flexibility measurement and data analysis processing. Compared with a traditional method, the method has higher adaptability and economic efficiency; particularly, under thecomplicated geological conditions of deep hole drilling and stratum crushing, when a stress relief method, a hydraulic fracturing method and the like are difficult to implement, the method can still possibly obtain the reliable ground stress data; and the adaptability is higher.

Description

technical field [0001] The invention relates to geological survey, in particular to a method for measuring ground stress by utilizing rock core hysteretic recovery deformation. Background technique [0002] In-situ stress is the natural stress existing in the formation without engineering disturbance. It is the fundamental force that causes the deformation and destruction of underground engineering, and it is the precondition for determining the mechanical properties of engineering rock mass, analyzing the stability of surrounding rock, realizing the optimization of underground engineering excavation design and scientific decision-making, and controlling the whole process of rock excavation. A large number of studies and in-situ stress measurements have shown that gravity and tectonic movement are the main causes of in-situ stress, especially the horizontal tectonic movement has the greatest impact on the formation of in-situ stress. The state of geostress at a certain loca...

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
no application Login to View More
IPC IPC(8): G01L5/16
CPCG01L5/16
Inventor 张广泽张小林刘毅应黎张延新王科韩康赵平吴俊猛赵鹏罗浩赵冬安刘博赖灿明吕泽君余行健张强边兆鑫江廷柱
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com