Study of rock NMR experiment and damage mechanism analysis under freeze-thaw condition

XU Yu-juan; ZHOU Ke-ping; LI Jie-lin; ZHANG Ya-min

English Version Journal Login

您当前的位置：

首页 >

文章列表页 >

Study of rock NMR experiment and damage mechanism analysis under freeze-thaw condition

更新时间：2026-06-25

- Study of rock NMR experiment and damage mechanism analysis under freeze-thaw condition
- Vol. 33, Issue 10, (2012)
- 作者机构：
  
  中南大学资源与安全工程学院,长沙,410083
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU452
- Online First：19 October 2012，
  
  Published：2012
- 稿件说明：
移动端阅览
XU Yu-juan, ZHOU Ke-ping, LI Jie-lin, et al. Study of rock NMR experiment and damage mechanism analysis under freeze-thaw condition[J]. 2012, 33(10).
DOI：

XU Yu-juan, ZHOU Ke-ping, LI Jie-lin, et al. Study of rock NMR experiment and damage mechanism analysis under freeze-thaw condition[J]. 2012, 33(10). DOI：

摘要

以花岗岩为岩样在最低冻结温度为-40 ℃、融化温度为20 ℃的条件下对5组岩样开展了冻融循环试验，最高累积冻融循环次数为100次，并采用核磁共振（NMR）技术检测岩样内部损伤变化。试验结果表明，冻融作用会对岩石内部造成损伤，循环次数达到一定值时岩样表面产生明显裂纹；NMR T2谱图和成像结果表明，冻融作用使岩样孔隙结构重新分布，孔隙数量随循环次数增加而增加，产生裂纹后T2曲线信号幅度发生显著变化。最后使用损伤力学原理对花岗岩冻融损伤机制进行探讨，得到材料连续性与孔隙率的损伤关系、有效应力与孔隙率的关系表达式，并以岩样核磁共振结果为基础，得出其有效应力与循环次数的表达式。

Abstract

Taking granite as samples

a freeze-thaw cycle experiment (with the temperature ranged from -40℃ to 20℃) is conducted. The highest cycles are 100. Nuclear magnetic resonance (NMR) technology is employed to observe the rock damage changes. The results show that freeze-thaw cycle action will produce damages to the sample. Some samples crack after a certain cycles. Both the T2 spectrum and NMR image indicate that the action of freezing and thawing cycle redistributes the inner structure of sample. The T2 curves change greatly after the cracks emerged. Finally

damage mechanism is adopted to analyze granite damage principle in condition of freeze-thaw. An equation of material continuity and porosity is obtained. Then an equation between effective stress and porosity is established. Taking N-4 for example

the relationship between effective stress and cycles is obtained.

关键词

Keywords

references

Views

2979

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Experiment study of rock porous structure damage under cryogenic nitrogen freezing

Deterioration characteristics of mechanical properties of heterogeneous accumulation of iron tailings sand under the action of freeze-thaw cycles

Fracture coalescence mechanism of single flaw rock specimen due to freeze-thaw under triaxial compression

Experimental study of dynamic parameters of silty soil subjected to repeated freeze-thaw

Experimental study of repeated frost heave and thaw settlement properties of silty sand

Related Author

CAI Cheng-zheng

LI Gen-sheng

HUANG Zhong-wei

SHEN Zhong-hou

王海柱

田守嶒

位江巍

ZHANG Hong-yue

Related Institution

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum

School of Civil Engineering, Liaoning Technical University

School of Urban Construction, Hubei University of Technology

Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology

School of Civil Engineering, Beijing Jiaotong University

AI问答

⁰