干湿循环作用下砂岩溶蚀的孔隙度演化规律

刘新荣; 袁文; 傅晏; 王子娟; 缪露莉; 谢文博

doi:10.11779/CJGE201803017

干湿循环作用下砂岩溶蚀的孔隙度演化规律 English Version

1. 重庆大学土木工程学院,重庆 400045;
2. 重庆大学山地城镇建设与新技术教育部重点实验室,重庆 400045;
3. 重庆大学建设管理与房地产学院,重庆 400045

基金项目: 国家自然科学基金青年基金项目（51308567）

详细信息

作者简介:
刘新荣(1969-),男,教授,博士生导师,主要从事岩土工程等方面的教学和科研。E-mail:liuxrong@126.com。

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出版历程
- 收稿日期: 2016-11-30
- 发布日期: 2018-03-24

Porosity evolution of sandstone dissolution under wetting and drying cycles

1. College of Civil Engineering, Chongqing University, Chongqing 400045, China;
2 Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education, Chongqing University, Chongqing 400045, China;
3. Faculty of Construction Management and Real Estate, Chongqing University, Chongqing 400045, China

摘要

摘要: 针对干湿循环作用下岩石劣化机理的复杂性,以砂岩为研究对象,通过对砂岩浸泡溶液离子浓度的测试,定量反分析砂岩矿物的溶解,得到砂岩孔隙度的演化规律,分析干湿循环作用下砂岩的劣化机制。结果表明：浸泡溶液中Ca²⁺的生成速率比K⁺、Na⁺、SiO₂高一个数量级,Fe²⁺的生成速率最低。每阶段循环后,方解石的体积减少量最多,其次是钾长石和钠长石,黑云母和石英的体积减少量最小。干湿循环作用后,微小的孔隙度变化,会导致抗压强度的大幅度降低,各阶段孔隙度变化值与劣化度成正相关。干湿循环侵蚀后,砂岩各种矿物的溶解流失,使得自身胶结物量减少,孔隙度增大,产生各种空洞与微裂缝,最终反映为强度的降低,是为干湿循环导致砂岩劣化的重要原因。
- 干湿循环 /
- 孔隙度 /
- 矿物 /
- 离子浓度 /
- 劣化度
Abstract: The deterioration mechanism of rock under wetting and drying cycles is complex. Taking sandstone as the research object, based on the ion concentration in immersion solution, the dissolution of sandstone minerals is quantitatively analyzed, and the evolution laws of sandstone porosity are obtained. Finally, the deterioration mechanism of sandstone under the effect of wetting and drying cycles is analyzed. The results show that the formation rate of Ca²⁺ is one order higher than that of K⁺, Na⁺ and SiO₂, and the formation rate of Fe²⁺ is the lowest. After each cycle phase, the volume reduction of calcite is the most, followed by that of potash feldspar and soda feldspar, while the volume reduction of black mica and quartz is the smallest. After wetting and drying cycles, the micro porosity changes, which will lead to a significant reduction in compressive strength, and the porosity change rate is positively correlated with the deterioration degree in each stage. After erosion of wetting and drying cycles, various minerals are dissolved in sandstone, leading to the decrease of cements and the increase of porosity, producing a variety of voids and micro cracks, and ultimately reflected in the decrease of the strength, which is the main cause of deterioration of sandstone after wetting and drying cycles.
- wetting and drying cycle /
- porosity /
- mineral /
- ion concentration /
- deterioration degree

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