三轴压力下水与砂岩反应的实验研究

地震 ›› 2009, Vol. 29 ›› Issue (2): 73-80.

三轴压力下水与砂岩反应的实验研究

江岳¹, 杜建国¹, 易丽¹, 罗丽², 王富宽³, 陈志¹

1.中国地震局地震预测研究所, 北京 100036;
2.中国地震局地质研究所, 北京 100029;
3.内蒙古自治区地质工程有限责任公司, 内蒙古呼和浩特 010051

收稿日期:2008-04-30 修回日期:2008-06-16 出版日期:2009-05-31 发布日期:2021-10-18
作者简介:江岳(1982-), 男, 北京市人, 2005年在读硕士研究生, 主要从事地震水化前兆的机理等研究。
基金资助:
地震预测研究所行业科研专项基金(02076902-33)和中国地震局地质研究所地震动力学国家重点实验室开放基金(LED0703)资助

Experimental Study of Water-sandstone Reaction under Triaxial Stress

JIANG Yue¹, DU Jian-guo¹, YI Li¹, LUO Li², WANG Fu-kuan³, CHEN Zhi¹

1. Institute of Earthquake Science, CEA, Beijing 100036, China;
2. Institute of Geology, CEA, Beijing 100029, China;
3. Inner Mongolia Corporation Ltd. of Geological Engineering, Hohhot 010051, China

Received:2008-04-30 Revised:2008-06-16 Online:2009-05-31 Published:2021-10-18

摘要/Abstract

摘要： 通过饱水砂岩的三轴压缩实验, 研究了含水层砂岩的破裂过程及其伴随的水化学变化, 并探讨了砂岩在蠕变和剪切破裂过程中地震水化异常现象的形成机理。用离子色谱仪(IC)和等离子原子发射光谱仪(ICP-OES)测定了不同压力条件下实验溶液的F^-、 Cl^-、 NO^-₃、 SO^2-₄、 Ca²⁺、 Mg²⁺、 Na⁺浓度。饱水砂岩在差应力作用下, 随着蠕变时间延长和剪切作用的强化实验, 溶液中主要离子的浓度均有不同程度的增大, 仅Mg²⁺浓度是降低的。 F^-和Cl^-浓度变化最明显, 在2~12小时的蠕变时间内分别增大约10倍和4倍, 而随剪切作用的强化分别增大约5倍和3倍。这种变化主要与矿物的溶解和流体包裹体的混入有关。实验结果表明, F^-、 Cl^-和Ca²⁺可作为砂岩含水层地震水化前兆监测的灵敏组分。

关键词: 砂岩, 差应力, 水岩反应, 离子浓度, 地震前兆

Abstract: Hydrochemical variations associated with the creeping and shearing deformation of saturated sandstone under triaxial compression were experimentally investigated, and genetic mechanism of hydrochemical anomalies related to earthquake was discussed. Concentrations of F^-, Cl^-, NO^-₃, SO^2-₄, Ca²⁺, Mg²⁺ and Na⁺ in the produced solutions under different stresses were measured by IC and ICP-OES. With the time of creeping increasing and the differential stresses on the saturated sandstone, the concentrations of different ions in the produced solution increased to different extents,only the concentration of Mg²⁺ decreased. Concentrations of F^- and Cl^-, which varied most obviously, increased by 10 and 4 times with creeping from 2 to 12 hours,and 5 and 3 times with the shearing stress increases respectively. These phenomena are mainly caused by the dissolution of minerals and mixture of fluid inclusions. The experiment results indicate that F^-, Cl^- and Ca²⁺ can be considered as sensitive components for monitoring earthquake in sandstone aquifers.

Key words: Sandstone, Differential stress, Water-rock reaction, Ion concentration, Earthquake precursor

中图分类号:

P315.7

江岳, 杜建国, 易丽, 罗丽, 王富宽, 陈志. 三轴压力下水与砂岩反应的实验研究[J]. 地震, 2009, 29(2): 73-80.

JIANG Yue, DU Jian-guo, YI Li, LUO Li, WANG Fu-kuan, CHEN Zhi. Experimental Study of Water-sandstone Reaction under Triaxial Stress[J]. EARTHQUAKE, 2009, 29(2): 73-80.

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