| 一种快速制备不同含水饱和度岩石试样的方法 |
| |
| 引用本文： | 巢志明,王环玲,徐卫亚,贾朝军,赵恺.一种快速制备不同含水饱和度岩石试样的方法[J].岩土力学,2018,39(3):1109-1114. |
| |
| 作者姓名： | 巢志明 王环玲 徐卫亚 贾朝军 赵恺 |
| |
| 作者单位： | 1. 河海大学 港口海岸与近海工程学院，江苏 南京 210098；2. 河海大学 岩土工程科学研究所，江苏 南京 210098 |
| |
| 基金项目： | 国家重点研发计划(2017YFC1501100)；国家自然科学基金项目（No.11772116，No.11572110）；中央高校基本科研业务费专项资金项目（No.2016B05314）。 |
| |
| 摘 要： | 岩石的含水饱和度对其力学参数有着较大的影响，针对目前关于制备不同含水饱和度岩样普遍存在着精度低、时间长、岩样含水分布不均匀等问题，根据化学-热力学原理，提出一种快速有效制备不同含水饱和度岩样的方法。该方法通过调节放置有岩样的恒湿负压环境的湿度，从而精确控制岩样最终稳定时组分水的逸度，以致控制岩样最终的含水饱和度。由于恒湿环境中水蒸气的逸度是恒定的，当环境中水蒸气的逸度与岩样中组分水的逸度不同时，外界恒湿环境中的水蒸气与岩样中组分水形成逸度差，当环境中水蒸气逸度小于岩样中组分水的逸度时，岩样中组分水渗出；反之，则水渗入岩样，最终岩样中组分水的逸度达到与外界恒湿环境相同的状态，制得相应含水饱和度的岩样。岩样是放置在负压环境中制备的，在负压环境中岩样孔隙中的空气减少，水蒸气在岩样中的渗透加快，从而缩短了岩样达到稳定的时间。根据气液平衡原理，岩样稳定时，岩样各个部分组分水的逸度相同，因此，制得的岩样含水分布均匀。
|
| 关 键 词： | 含水饱和度 逸度 恒湿环境 负压 气液平衡 化学热力学 |
| 收稿时间： | 2016-04-11 |
A rapid method for preparing rock samples with different water saturation levels |
| |
| CHAO Zhi-ming,WANG Huan-ling,XU Wei-ya,JIA Chao-jun,ZHAO Kai.A rapid method for preparing rock samples with different water saturation levels[J].Rock and Soil Mechanics,2018,39(3):1109-1114. |
| |
| Authors: | CHAO Zhi-ming WANG Huan-ling XU Wei-ya JIA Chao-jun ZHAO Kai |
| |
| Institution: | 1. College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing, Jiangsu 210098, China |
| |
| Abstract: | Water saturation in rock significantly affects its mechanical parameters. However, the existing methods for preparing rock specimens with different water saturation levels have some common problems, such as low accuracy, long time, and uneven distribution of water. This paper proposed a rapid and efficient procedure to prepare rock samples with different water saturation degrees based on chemical thermodynamic principles. This method can control water saturation of rock specimens precisely by adjusting the humidity of environment with a negative pressure, which governs the fugacity of water in rock samples. Since the fugacity of water vapour in constant humidity environment is identical, the water vapour and the content water in rock samples would form a fugacity difference when the fugacity of the water vapour and the content water are different. Content water in rock samples would escape from rock samples when the fugacity of water vapour in the environment is less than that of content water in rock specimens. Otherwise, water vapour would infiltrate into rock samples. Eventually, rock specimens with certain water saturation levels are obtained when the fugacity of content water in rock specimens and water vapour in the environment are equal. Rock specimens were prepared in a negative pressure environment. Air in the porosity of rock specimens would decrease and the seepage velocity of water vapour in rock samples increases in this kind of environment, which can shorten the time of rock specimens to reach the steady state. The fugacity of content water in every component of rock specimen is equal when rock specimen reaches the steady state, according to vapour-liquid equilibrium principles. Therefore, the distribution of water in rock specimens is even. |
| |
| Keywords: | water saturation fugacity constant humidity environment negative pressure gas-liquid equilibrium chemical thermodynamics |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
