溶浸–应力耦合作用下钙芒硝盐岩蠕变特性研究

doi:10.13722/j.cnki.jrme.2016.0827

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摘要为了研究钙芒硝岩在原位溶浸开采过程中的蠕变力学特性，采用自主研发的多功能岩石力学试验机，进行了轴压5 MPa、围压4 MPa条件下，不同渗透压(3，2，1 MPa)作用下的三轴蠕变力学试验。模拟溶浸开采生产过程，将钙芒硝蠕变过程分为溶浸连通蠕变阶段、饱水蠕变阶段、排水蠕变阶段和轴压20 MPa蠕变阶段4个阶段，对比分析了上述4个阶段的钙芒硝盐岩的蠕变特性差异。研究结果表明：在溶浸连通蠕变阶段，渗透压力越大，溶解连通时间越短；反之，则时间越长。在溶浸连通蠕变阶段和饱水蠕变阶段，不断演化的矿物溶解与相对恒定的有效应力对钙芒硝盐岩的蠕变变形起主要影响；在排水蠕变阶段和轴压20 MPa高压变形阶段，溶浸作用历史过程及其对钙芒硝盐岩固体骨架力学性能的弱化程度决定了钙芒硝盐岩的变形特性。曲线拟合结果表明，广义Kelvin模型能够较好地描述溶浸渗透加载作用下钙芒硝盐岩的三维压缩蠕变力学特性。该研究结果不仅揭示了钙芒硝盐岩在特殊的溶浸–应力耦合作用条件下的蠕变特性，同时，也可为钙芒硝盐矿溶浸过程中矿体稳定性分析提供一定参考依据。

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	梁卫国1
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	曹孟涛1
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	杨晓琴1
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	张传达1
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	徐素国1
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关键词 ：岩石力学, 钙芒硝盐岩, 蠕变, 溶浸作用

Abstract：To investigate the creep properties of in-situ glauberite salt rock during the process of solution mining，the mutifunctional rock testing machine was used to conduct the tri-axial creep tests under the confining pressure of 4 MPa，the axial pressure of 5 MPa and the infiltration pressure of 3，2 and 1 MPa，respectively. To simulate the processes of solution mining，the creep process of glauberite salt rock was divided into four stages including the creep stage of hydraulic connection(CSHC)，the creep stage with pore water pressure(CSPWP)，the creep stage after drainage (CSAD) and the creep stage under axial pressure of 20 MPa(CSAP). The creep behaviors of four stages were compared. The results show that the hydraulic connection time for galuberite salt rock increases with decreasing infiltration pressure. At CSHC and CSPWP，continual dissolution of the minerals and the effective stress have signifacant effect on the creep deformations of specimens. The deformations of glauberite salt rock at CSAD and CSAP are dominated by the loading history of dissolution and the softening degree of mechanical properties of solid skeleton. Finally，the generalized Kelvin model was used to fit the creep curves at different creep stages，and it can describe the triaxial creep behavior of glauberite salt rock under coupled effect of dissolution and infiltration pressure.

Key words： rock mechanics glauberite salt rock creep dissolution effect

引用本文:

梁卫国1，2，曹孟涛1，2，杨晓琴1，2，张传达1，2，徐素国1，2. 溶浸–应力耦合作用下钙芒硝盐岩蠕变特性研究[J]. 岩石力学与工程学报, 2016, 35(12): 2461-2470.
LIANG Weiguo1，2，CAO Mengtao1，2，YANG Xiaoqin1，2，ZHANG Chuanda1，2，XU Suguo1，2. Experimental study on creep of glauberite salt rock under coupled compression and dissolution. , 2016, 35(12): 2461-2470.

链接本文:

http://rockmech.org/CN/10.13722/j.cnki.jrme.2016.0827 或 http://rockmech.org/CN/Y2016/V35/I12/2461

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