Dong Wushu, Li Ze, Shen Linfang, Liu Wenlian, Guo Yakun, Xu Hanhua, Yong Rui
Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, 650500, Yunnan, China.
Kunming Prospecting Design Institute of China Nonferrous Metals Industry Co., Ltd, Kunming, 650051, China.
Sci Rep. 2024 Mar 4;14(1):5278. doi: 10.1038/s41598-024-56038-w.
The long-term erosion of rock by solution can induce a series of karst problems. Therefore, this study focused on limestone and conducted dynamic dissolution experiments under deionized water and CO solution conditions to study the deterioration mechanism of limestone under nonequilibrium conditions. The results showed that the degree of degradation of the mechanical properties of the samples in a CO solution was obviously greater. In a deionized water environment, the degradation of the mechanical properties of the sample is mainly controlled by the physical softening action of the solution. In the CO solution environment, the degradation process can be divided into two stages. In the early stage of the experiment (10 days to 20 days), the degradation of mechanical properties of the sample is also controlled by the physical softening action of the solution. With increasing soaking time, the main rock-forming minerals of limestone gradually react with the CO solution, the degradation of the sample is controlled mainly by the chemical corrosion of the CO solution, and its degradation rate is much greater than that of physical softening. The results can be used as a reference for assessing the long-term stability of underground engineering in limestone karst development areas.
长期的岩石溶解侵蚀会引发一系列岩溶问题。因此，本研究聚焦于石灰岩，在去离子水和CO₂溶液条件下进行了动态溶解实验，以研究非平衡条件下石灰岩的劣化机制。结果表明，样品在CO₂溶液中的力学性能降解程度明显更大。在去离子水环境中，样品力学性能的降解主要受溶液的物理软化作用控制。在CO₂溶液环境中，降解过程可分为两个阶段。在实验初期（10天至20天），样品力学性能的降解也受溶液的物理软化作用控制。随着浸泡时间的增加，石灰岩的主要造岩矿物逐渐与CO₂溶液发生反应，样品的降解主要受CO₂溶液的化学腐蚀控制，其降解速率远大于物理软化速率。该结果可为评估石灰岩岩溶发育地区地下工程的长期稳定性提供参考。
