›› 2017, Vol. 38 ›› Issue (7): 1933-1942.doi: 10.16285/j.rsm.2017.07.012

• 基础理论与实验研究 • 上一篇    下一篇

层状盐岩石膏夹层在腐蚀条件下断裂韧度试验及其弱化机制研究

孟 涛1,胡耀青1,付庆楠2,冯 淦1,靳佩华1   

  1. 1. 太原理工大学 采煤工艺研究所,山西 太原 030024;2. 太原理工大学 力学学院,山西 太原 030024
  • 收稿日期:2015-08-28 出版日期:2017-07-10 发布日期:2018-06-05
  • 通讯作者: 胡耀青,男,1963年生,教授,主要从事岩石力学与工程的教学与研究工作。E-mail: huyaoqing_tyut@163.com E-mail: hjmt1987@qq.com
  • 作者简介:孟涛,男,1987年生,博士研究生,主要从事岩石力学的试验和模拟工作
  • 基金资助:

    国家自然科学基金项目(No. 51574173)。

Experimental study on fracture toughness of gypsum interlayer in bedded rock salt under corrosive environment and its weakening mechanisms

MENG Tao1, HU Yao-qing1, FU Qing-nan2, FENG Gan1, JIN Pei-hua1   

  1. 1. Mining Technology Institute, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China; 2. College of Mechanics, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
  • Received:2015-08-28 Online:2017-07-10 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51574173).

摘要: 国内盐岩矿床的典型特征是夹层多,其中云应、平顶山地区多为石膏夹层。盐岩储库在建造和运行过程中,夹层会浸泡在卤水和石油中。为了研究石膏夹层在腐蚀条件下的断裂韧度和弱化损伤机制,采用国际岩石力学学会建议的V形切槽巴西圆盘试验(CCNBD)试件,分别将其浸泡在淡水、半饱和卤水、饱和卤水和酸性石油中,温度分别为20 ℃、50 ℃、80 ℃,浸泡时间为1个月,并与干试件进行对比。研究结果表明:同一种液体浸泡后,石膏的断裂韧度随着温度的升高而急剧下降,而同一温度下,石膏的断裂韧度随着卤水的浓度增大基本不变。水和卤水浸泡后的石膏断裂韧度变化程度要大于酸性石油。石膏在水和卤水浸泡后的弱化机制是由于水-温度-氯离子的作用,其中水-温度的作用占主导,氯离子的侵蚀作用较小;酸性石油浸泡后的弱化机制是因为温度破坏了氢键及受热膨胀,同时另一原因是石膏和酸性石油(环烷酸)发生弱反应。环烷酸和石膏发生环烷酸钙,而环烷酸钙溶于油相有利于反应正向进行。上述研究对评估盐岩储库的稳定性及其密闭性具有重要意义。

关键词: 层状盐岩, 石膏夹层, 断裂韧度, 氯离子

Abstract: In China, rock salt deposits are typically characterized by interlayers, which are mostly distributed in Yunying and Pingdingshan areas. In the construction and operation processes of salt caverns, gypsum interlayers are soaked in corrosive solutions (e.g., brine and oil). To investigate fracture toughness and weakening mechanisms of gypsum interlayers under corrosive environment, we conducted a series of cracked chevron-notched Brazilian disk (CCNBD) tests. The CCNBD specimens suggested by ISRM were prepared in the laboratory and were soaked in four different liquids (i.e., water, half saturated brine, saturated brine and acidic oil) under three different temperatures (i.e., 20, 50 and 80 ℃). The soaking time for specimens was one month. Moreover, the results of soaked specimens are compared with those of dry ones. The results indicate that fracture toughness of gypsum significantly decreases with the increase of temperature when soaked in a given liquid. By contrast, the fracture toughness of gypsum approximately remains constant at the same temperature. The degree of fracture toughness of gypsum after water and brine immersion is greater than that of acidic oil. The weakening of gypsum soaked in water and brine is attributed to the combined effects of water, temperature, and chlorine ions. Specially, the effect of water-temperature contributes to a severe weakening, but the chlorine ions have little effect. The weakening mechanisms of gypsum soaked in acidic oil are chemical reactions and dehydration. Petroleum acid (naphthenic acid) reacts with gypsum to produce calcium naphthenate, which can be dissolved in the oil phase. During this process, the dissolution of calcium naphthenate in the oil phase promotes the forward reaction. Consequently, the study is significant for the evaluation of the leakage risk of storage caverns in bedded salt deposits.

Key words: bedded rock salt, gypsum interlayer, fracture toughness, chloride ions

中图分类号: 

  • TU 45

[1] 张 盛, 王龙飞, 常 旭, 王东坤, 王小良, 乔 洋, . 中心直裂纹半圆盘试样的石灰岩断裂韧度 尺寸效应试验研究[J]. 岩土力学, 2019, 40(5): 1740-1749.
[2] 姜德义, 李晓康, 陈 结, 李晓军, 刘 伟, 康燕飞, . 层状盐岩双井流场浓度场试验及数值计算[J]. 岩土力学, 2019, 40(1): 165-172.
[3] 赵子江,刘大安,崔振东,唐铁吾,韩伟歌,. 半圆盘三点弯曲法测定页岩断裂韧度(KIC) 的实验研究[J]. , 2018, 39(S1): 258-266.
[4] 曹 富,杨丽萍,李 炼,刘恩龙,王启智, . 压缩单裂纹圆孔板(SCDC)岩石动态断裂全过程研究[J]. , 2017, 38(6): 1573-1582.
[5] 郝铁生,耿毅德,陈跃都,. 含脆硬夹层盐岩力学特性试验研究[J]. , 2017, 38(11): 3119-3126.
[6] 郭俊志,谢其泰,王建力,. 边缘裂缝圆盘砂岩试体III型断裂韧度量测之研究[J]. , 2016, 37(S1): 263-266.
[7] 华 文,董世明,徐积刚. 复合型加载条件下锈岩断裂韧度试验研究[J]. , 2016, 37(3): 753-758.
[8] 戴 峰,魏明东,徐奴文,许 媛,赵 涛. 岩石断裂韧度CCNSCB方法渐进破坏机制与无量纲应力强度因子宽范围标定[J]. , 2016, 37(11): 3215-3223.
[9] 王兵武 ,李银平 ,杨春和 ,刘 伟 ,张桂民,. 界面倾角对复合层状物理模型材料力学特性的影响研究[J]. , 2015, 36(S2): 139-147.
[10] 任 松,吴建勋,陈 结,姜德义,文永江,邱华富. 层状盐岩造腔仿真软件开发及其实用性验证[J]. , 2014, 35(9): 2725-2730.
[11] 贾 超,张 凯,张强勇,徐 坤. 基于正交试验设计的层状盐岩地下储库群多因素优化研究[J]. , 2014, 35(6): 1718-1726.
[12] 苟小平 ,杨井瑞 ,王启智 . 基于P-CCNBD试样的岩石动态断裂韧度测试方法[J]. , 2013, 34(9): 2449-2459.
[13] 张 盛 ,李新文 ,杨向浩 . 动载确定方法对岩石动态断裂韧度测试的影响[J]. , 2013, 34(9): 2721-2726.
[14] 刘 伟、 李银平、霍永胜、施锡林、徐宝财、杨春和、林永杰、. 盐岩地下储库围岩界面变形与破损特性分析[J]. , 2013, 34(6): 1621-1628.
[15] 刘增利,李洪升,邢怀念,张小鹏. 冻土非线性断裂韧度的修正因子测试方法[J]. , 2013, 34(3): 908-912.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!