基于短期室内试验推导长期稳态蠕变率的盐岩本构模型
Rock Salt Creep Constitutive Model to Predict the Long-term Stationary Creep Rate with Short-term Laboratory Experimental Data
作者：李梦瑶(四川大学 建筑与环境学院, 四川 成都 610065)；苟杨(德国克劳斯塔尔工业大学 石油天然气工程研究所, 克劳斯塔尔 38678;德国下萨克森州能源研究中心, 哥斯拉尔 38640)；侯正猛(四川大学 建筑与环境学院, 四川 成都 610065;德国克劳斯塔尔工业大学 石油天然气工程研究所, 克劳斯塔尔 38678;德国下萨克森州能源研究中心, 哥斯拉尔 38640)
Author：LI Mengyao(College of Architectural and Environment, Sichuan Univ., Chengdu 610065, China)；GOU Yang(Inst. of Petroleum Eng., Clausthal Univ. of Technol., Clausthal 38678, Germany;Energy Research Center of Lower Saxony (EFZN), Goslar 38640, Germany)；HOU Zhengmeng(College of Architectural and Environment, Sichuan Univ., Chengdu 610065, China;Inst. of Petroleum Eng., Clausthal Univ. of Technol., Clausthal 38678, Germany;Energy Research Center of Lower Saxony (EFZN), Goslar 38640, Germany)
收稿日期：2018-03-23 年卷（期）页码：2018,50(5):138-144
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：盐岩蠕变;本构模型;稳态蠕变率;Lubby2;IfG-G&S;Lubby2_Ⅰ-Ⅱ模型
Key words：creep of rock salt;constitutive model;stationary creep rate;Lubby2;IfG-G&S;Lubby2_Ⅰ-Ⅱ model
基金项目：国家自然科学基金国际重大合作项目资助（51120145001）
中文摘要
由于试验时间的限制，短期室内试验测得的稳态蠕变速率往往为现场实测的5~50倍，故如何通过持续时间较短的蠕变试验结果推求出盐岩长期稳态蠕变率是盐岩蠕变特性研究中的一大难点。基于盐岩蠕变特性的现有理论研究，提出利用新的本构模型解决上述难题。结合典型盐岩蠕变本构模型Lubby2和IfG-G&S的优点，提出能够描述盐岩从一期自动进入二期蠕变全过程，且能够进一步发展为考虑蠕变损伤和失稳的Lubby2_Ⅰ-Ⅱ模型。基于江苏金坛盐岩的试验数据，求得3个蠕变本构模型的参数，并用以计算盐样的稳态蠕变率和金坛储气库的变形量。结果表明：Lubby2_Ⅰ-Ⅱ模型不仅能够较好地描述盐样的实测蠕变曲线，且与金坛储气库二期稳态蠕变率的反演现场值接近。这一结果很好地验证了Lubby2_Ⅰ-Ⅱ模型基于短期室内试验推导现场条件下的盐岩长期稳态蠕变率的可靠性。
英文摘要
Due to the time limitation of creep tests in laboratories, the derived stationary creep rate is usually 5 to 50 times as large as it measured in-situ. Estimation of the long-term stationary creep rate from creep experiments with a short duration is a difficulty issue in salt mechanics. Based on the existing theoretical research on the creep behavior of rock salt, a new constitutive model was proposed to solve the above problem. By combining the advantages of two typical rock salt creep constitutive models of Lubby2 and IfG-G&S, a new Lubby2_Ⅰ-Ⅱ model was developed. This new model can describe the automatic transform of the rock salt behavior from the transient creep into the stationary creep, and be further developed into a creep damage model. Based on the experimental data of the rock salt in Jintan, Jiangsu, the parameters of the above three creep models were determined. In addition, the stationary creep rate and deformation were calculated by using the obtained parameters, and then compared with the experimental data and the convergence of the rock salt cavern in Jintan. The results showed that the Lubby2_Ⅰ-Ⅱ model can not only describe the creep experimental curve of the salt sample well, but also estimate the back analyzed long-term stationary creep rate of the rock salt in Jintan much better and more reliable. This good agreement confirms the reliability of the Lubby2_Ⅰ-Ⅱ model for estimating the long-term stationary creep rate from short-term laboratory experimental data.
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