Huang Luyi, Lin Hang, Cao Ping, Zhao Qingxiong, Pang Yongkang, Yong Weixun
School of Resources and Safety Engineering, Central South University, Changsha 410083, China.
Materials (Basel). 2023 Oct 2;16(19):6536. doi: 10.3390/ma16196536.
The research aimed to examine the impact of different pH solutions on the tensile mechanical properties of saturated and natural sandstone specimens. The study utilized the WHY-300/10 microcomputer-controlled pressure testing machine to conduct Brazil splitting tests and employed acoustic emission and local dynamic strain testing techniques. The results indicated the tensile strength and split tensile modulus of the sandstone specimens gradually decreased with the polarisation of the solution pH, and the acoustic emission signal ring number monitoring values showed an increasing trend. The pH of the soaking solution followed an exponential decay pattern over time, eventually tending towards weak alkalinity. A new damage variable based on the cumulative ring count after chemical corrosion was defined to indirectly analyze the degree of corrosion degradation. It was discovered that in acidic or alkaline environments, the internal crystals of the rock are dissolved, weakening the mineral interconnections and causing a deterioration in tensile stress and strength. These findings can provide valuable insights for ensuring the safety and stability of the Denglou Mountain Tunnel in Yunnan Province.
该研究旨在考察不同pH值溶液对饱和及天然砂岩试件拉伸力学性能的影响。该研究利用WHY - 300/10微机控制压力试验机进行巴西劈裂试验，并采用声发射和局部动态应变测试技术。结果表明，砂岩试件的抗拉强度和劈裂抗拉模量随溶液pH值的极化而逐渐降低，声发射信号环数监测值呈上升趋势。浸泡溶液的pH值随时间呈指数衰减模式，最终趋于弱碱性。定义了一种基于化学腐蚀后累积环数的新损伤变量，以间接分析腐蚀降解程度。研究发现，在酸性或碱性环境中，岩石内部晶体溶解，削弱了矿物间的连接，导致拉应力和强度降低。这些研究结果可为确保云南省灯笼山隧道的安全与稳定提供有价值的见解。
