摘要
以洛阳龙门石窟灰岩为研究对象,考虑石窟区灰岩渗水溶液的侵蚀和冬季冻融损伤的影响,进行不同水化学溶液及冻融耦合作用下的力学试验,研究龙门石窟灰岩在水化学溶液及冻融耦合作用下的力学损伤特征。试验表明,水化学溶液及冻融耦合侵蚀作用下,随着冻融循环次数的增多,灰岩的损伤逐渐增大;与水化学溶液单一的侵蚀作用相比,水化学溶液及冻融耦合侵蚀作用对岩石的损伤程度要大,如在相同的冻融循环次数(90次)的情况下,在蒸馏水、龙门水、NaCl溶液与冻融耦合作用下,试件的强度比自然状态分别下降了50.73%,54.92%,57.67%,而仅受上述溶液作用没有经历冻融的试件强度则分别下降了21.58%,22.88%和28.72%。在试验研究范围内,龙门石窟灰岩的冻融劣化模式均为颗粒损失模式。分析指出,水化学溶液及冻融耦合侵蚀作用下,溶液中凝结核的丰度和溶液的pH值是影响灰岩损伤程度的重要因素。在对试验结果分析的基础上,建立水化学溶液及冻融耦合作用下龙门石窟灰岩的侵蚀损伤方程。研究结果将为石质文物及岩石工程的长期保护提供重要的理论基础,具有广泛的实际工程应用价值和应用前景。
Mechanical experiments of the limestone samples from Longmen grottoes under the action of coupled chemical solutions and freezing-thawing processes were carried out to investigate the infiltrated water erosion and freezing-thawing damage on the surrounding rocks in Longmen grottoes. The results of the experiments demonstrated that the mechanical damage of limestone was increased gradually as with increasing freezingthawing cycles under the coupled chemical solution and freezing-thawing processes and the damage was greater than that under the erosion of chemical solutions only. For example,for the cases of the freezing-thawing cycles of 90 under the coupled chemical solution and freezing-thawing processes,the strengths of the specimens soaked in the distilled water,Longmen water and NaCl solution dropped 50.73%,54.92% and 57.67% respectively compared with the specimen strength in the natural state. While under the erosion of chemical solutions without freezing-thawing,the strengths was dropped only 21.58%,22.88% and 28.72% respectively. The freezing-thawing deterioration model of limestone under investigation was found to be all due to the particle loss model. The abundance of the condensation nuclei and the pH value of water solution were found to be the important factors affecting the degree of damage to the limestone under the coupled chemical solution and freezing-thawing processes. An equation describing the erosion damage to limestone under coupled action was established.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第5期979-985,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51279073
51179187)
河南省科技创新人才杰出青年基金资助项目(114100510016)
关键词
岩石力学
水化学溶液侵蚀
冻融损伤
力学试验
耦合作用
灰岩
rock mechanics
chemical solution erosion
freezing-thawing damage
mechanical experiments
coupling interaction
limestone
