溶蚀作用下岩盐塑性力学模型研究

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摘要基于溶蚀作用下岩盐力学性质发生改变机制分析，建立溶蚀作用下岩盐塑性力学模型。研究结果表明，溶蚀作用下岩盐力学性质发生改变机制在于溶蚀作用使得岩盐宏观力学参数发生了变化，但岩盐力学破坏机制并没有本质上的改变；采用应变硬化–软化模型来描述无溶蚀作用下岩盐塑性力学行为，并结合常规三轴压缩试验结果，得出无溶蚀作用下黏聚力和内摩擦角与等效塑性应变之间的关系式；基于溶蚀作用下岩盐力学性质发生改变机制以及无溶蚀作用下岩盐塑性力学模型，在考虑黏聚力随溶蚀作用发生变化的前提下，建立岩盐塑性力学模型；结合单轴压缩条件下岩盐应力–溶解耦合效应的细观力学试验结果，采用FLAC–遗传算法联合求解方法对溶解阶段黏聚力随溶解时间的变化规律进行计算，确定溶解后再加载阶段黏聚力计算公式，并归纳出溶蚀作用下岩盐塑性力学模型中黏聚力的变化规律。

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	汤艳春1
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关键词 ：岩石力学, 岩盐, 溶蚀作用, 塑性力学模型, 黏聚力

Abstract：Through analysis of mechanism of variation for rock salt mechanical properties with dissolving effect，rock salt plastic mechanical model with dissolving effect has been established. The analysis results show that mechanism of variation for rock salt mechanical properties with dissolving effect is because that macro- mechanical parameters of rock salt，such as cohesion，have been varied with dissolving effect；but rock salt failure mechanism has been unchanged essentially. With strain harding-softing model which can be used to reasonably describe rock salt mechanical behavior，rock salt plastic mechanical model without dissolving effect has been established；and associated with the conventional triaxial compression test results，the expressions between cohesion and internal friction angle without dissolving effect and equivalent plastic strain have been obtained. Based on mechanism of variation for rock salt mechanical properties with dissolving effect and rock salt plastic mechanical model without dissolving effect，and under the premise that with dissolving effect，the value of cohesion has been changed，the rock salt plastic mechanical model with dissolving effect has been established. At last，based on the uniaxial compression meso-mechanical test results of rock salt with coupled stress-dissolving effect，the variation rule of cohesion on dissolving phase with dissolving time is calculated by combined FLAC-Genetic Algorithms. The formula of cohesion on reloading phase after dissolving is obtained；and the variation rule of cohesion of rock salt plastic mechanical model with dissolving effect has also been obtained.

Key words： rock mechanics rock salt dissolving effect plastic mechanical model cohesion

引用本文:

汤艳春1，2，周辉1. 溶蚀作用下岩盐塑性力学模型研究[J]. 岩石力学与工程学报, 2012, 31(S1): 3031-3037.
TANG Yanchun1，2，ZHOU Hui1. STUDY OF PLASTIC MECHANICAL MODEL OF ROCK SALT WITH DISSOLVING EFFECT. , 2012, 31(S1): 3031-3037.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2012/V31/IS1/3031

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