西安建筑科技大学学报(自然科学版)

通过对不同腐蚀阶段不同浓度硫酸溶液的pH值、阳离子浓度、砂岩质量等的变化进行监测,结合单轴压缩试验和CT扫描试验,对砂岩受酸腐蚀过程中的物理、化学及力学性质进行分析.基于引申的Lemaitre应变等效原理,建立受酸腐蚀砂岩的损伤本构模型.研究结果表明:(1)砂岩岩样在不同浓度硫酸溶液中浸泡的不同阶段,其质量变化及溶液的pH值变化都呈现出明显的阶段性特征;(2)阳离子溶蚀速率均在反应初期达到最大值,且Ca2+溶蚀速率最快,相同浸泡阶段,硫酸溶液浓度越强其阳离子的溶蚀速率越大;(3)随着浸泡时间的延长,砂岩单轴抗压强度减小,岩样从弹塑性阶段到破坏阶段的过程延长,岩样的损伤变量呈增大趋势.

Through monitoring the changes of pH value, cationic concentration and mass of sandstone in different concentrations of H2SO4 solution at different corrosion stages, and by combining with uniaxial compression test and CT scan test, the physical, chemical and mechanical properties of sandstone were analyzed. Based on the extended lemaitre strain equivalent principle, the damage constitutive model of acid-corroded sandstone is established. Results showed that:(1)The mass change of sandstone samples and the change of pH value of the solution immersed in different concentrations of H2SO4 solution show obvious phased characteristics at different stages.(2)The dissolution rate of the cationic solution reached the maximum at the initial stage of the reaction, and the dissolution rate of the Ca2+ was the fastest, and the higher the concentration of H2SO4 solution, the greater the rate of dissolution of the cation at the same soaking stage.(3)With the extension of immersion time, the uniaxial compressive strength of sandstone decreased, and the process of rock samples from elastic-plastic stage to failure stage was prolonged, and the damage variable of rock samples increased.

引言
1 试验材料与方法
2 结果和讨论
3 受酸腐蚀砂岩的损伤本构模型
4 结论

表1 溶液的配制<br/>Tab.1 Preparation of solution

表1 溶液的配制
Tab.1 Preparation of solution

图1 砂岩岩样的质量变化率曲线<br/>Fig.1 The mass change rate curve of sandstone samples

图1 砂岩岩样的质量变化率曲线
Fig.1 The mass change rate curve of sandstone samples

图2 硫酸溶液中不同腐蚀阶段pH值变化曲线<br/>Fig.2 pH value change curve of different corrosion stages in sulfuric acid solution

图2 硫酸溶液中不同腐蚀阶段pH值变化曲线
Fig.2 pH value change curve of different corrosion stages in sulfuric acid solution

图3 Na+溶解速率图<br/>Fig.3 Na+ dissolution rate diagram

图3 Na+溶解速率图
Fig.3 Na+ dissolution rate diagram

图4 K+溶解速率图<br/>Fig.4 K+ dissolution rate diagram

图4 K+溶解速率图
Fig.4 K+ dissolution rate diagram

图5 Mg2+溶解速率图 <br/>Fig.5 Mg2+ dissolution rate diagram

图5 Mg2+溶解速率图
Fig.5 Mg2+ dissolution rate diagram

图6 Ca2+溶解速率图<br/>Fig.6 Ca2+ dissolution rate diagram

图6 Ca2+溶解速率图
Fig.6 Ca2+ dissolution rate diagram

图7 浸泡30 d后岩样的应力-应变曲线<br/>Fig.7 Stress-strain curve of rock sample after soaking 30 d

图7 浸泡30 d后岩样的应力-应变曲线
Fig.7 Stress-strain curve of rock sample after soaking 30 d

图8 浸泡90 d后岩样的应力-应变曲线<br/>Fig.8 Stress-strain curve of rock sample after soaking 90 d

图8 浸泡90 d后岩样的应力-应变曲线
Fig.8 Stress-strain curve of rock sample after soaking 90 d

表2 同一扫描面不同腐蚀阶段的损伤变量<br/>Tab.2 Damage variables at different corrosion stages of the same scanning surface

表2 同一扫描面不同腐蚀阶段的损伤变量
Tab.2 Damage variables at different corrosion stages of the same scanning surface

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备注

引言

1 试验材料与方法

2 结果和讨论

3 受酸腐蚀砂岩的损伤本构模型

4 结论

期刊信息