School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, China.
Department of Civil Engineering, Nanchang Institute of Technology, Nanchang, China.
PLoS One. 2024 Nov 18;19(11):e0313359. doi: 10.1371/journal.pone.0313359. eCollection 2024.
The main factors affecting the safety of underground structures are groundwater chemical corrosion and water level fluctuations. To investigate the mechanical properties of marble and the energy evolution pattern during the failure process under the coupled effects of chemical corrosion and dry-wet cycling, samples were subjected to 5, 10 and 20 cycles of dry-wet ageing in chemical solutions with pH values of 4, 7 and 10, respectively, followed by mechanical property testing. The energy evolution pattern during the failure process of the specimens was also studied. It was found that there is a strong correlation between number of dry-wet cycles and pH value of chemical solution. Chemical corrosion at the early stage of dry-wet cycling has the greatest effect on the deterioration of the rock. As the number of dry-wet cycles increases, the degree of corrosion in acidic solutions is most evident, with the uniaxial compressive strength and elastic modulus decreasing by 27.88% and 33.52% respectively, followed by alkaline solutions, and the degree of corrosion in neutral solutions is the lowest. In addition, dry-wet cycling and chemical corrosion lead to an increase in the internal pores of the rock samples and a decrease in the energy storage capacity. Nevertheless, the proportion of energy loss increases with the number of dry and wet cycles, with the proportion of energy loss in acidic media increasing from 35.61% to 41.63%, indicating that the plastic deformability of marble increases under the action of chemical corrosion and dry and wet cycles. The research results have certain guiding significance for the design, construction and maintenance reinforcement of underground structures under the conditions of chemical corrosion and dry-wet cycling.
影响地下结构安全的主要因素是地下水的化学腐蚀和水位波动。为了研究化学腐蚀和干湿循环耦合作用下大理石的力学性能和破坏过程中的能量演化模式，对样品进行了 pH 值分别为 4、7 和 10 的化学溶液中 5、10 和 20 次干湿老化循环，然后进行力学性能测试。还研究了试样破坏过程中的能量演化模式。结果表明，干湿循环次数与化学溶液 pH 值之间存在很强的相关性。干湿循环早期的化学腐蚀对岩石劣化的影响最大。随着干湿循环次数的增加，酸性溶液中的腐蚀程度最为明显，单轴抗压强度和弹性模量分别降低了 27.88%和 33.52%，其次是碱性溶液，中性溶液中的腐蚀程度最低。此外，干湿循环和化学腐蚀导致岩石样品内部孔隙增加，储能能力降低。然而，随着干湿循环次数的增加，能量损失的比例增加，酸性介质中能量损失的比例从 35.61%增加到 41.63%，表明在化学腐蚀和干湿循环作用下，大理石的塑性变形能力增加。研究结果对化学腐蚀和干湿循环条件下地下结构的设计、施工和维护加固具有一定的指导意义。
