循环作用对马蹄寺石窟群岩体性能的影响  

Cycling Effect on Rock Mass Properties of Mati Temple Grottoes

作　　者：乔榛 王逢睿 王捷[1] 朱多彦 QIAO Zhen;WANG Feng-rui;WANG Jie;ZHU Duo-yan(Northwest Research Institute Co.Ltd.of China Railway Engineering Corporation,Grottoes Protection Technology Base of State Administration of Cultural Heritage,Geotechnical Cultural Relics Protection Research Center of Gansu Province;School of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]中铁西北科学研究院有限公司,国家文物局石窟保护技术重点科研基地,甘肃省岩土文物保护工程技术研究中心 [2]兰州大学土木工程与力学学院,兰州730000

出　　处：《科学技术与工程》2019年第28期64-70,共7页Science Technology and Engineering

基　　金：中铁科学研究院重点创新项目(2018-KJ005-Z005-XB)资助

摘　　要：马蹄寺石窟群地处河西走廊中部,气候条件十分恶劣。由于常年受到温度、湿度、酸碱盐等作用的影响,石窟岩体性能出现了不同程度的劣化现象。通过开展室内模拟试验,研究以上多种恶劣环境的循环作用对于岩体抗压强度、波速、质量的影响规律,同时使用X射线衍射仪(X-ray diffraction,XRD)、X射线荧光光谱(X-ray fluorescence,XRF)和扫描电子显微镜(scanning electron microscope,SEM)对循环作用过程中样品的矿物组分、元素含量和微观形貌进行分析研究。研究结果表明,循环作用使样品中的长石类矿物和方解石含量降低,黏土类矿物含量增加,胶结程度下降,孔隙逐渐发展成为横向微裂隙,导致样品的性能出现不同程度的劣化现象。循环作用对岩体性能的影响程度从大到小依次为冻融循环、耐盐循环、耐碱循环、耐酸循环和温湿循环。Mati temple grottoes located in Gansu Corridor,the weather conditions of this area are harsh. The properties of rock mass get to worse due to several effects such as temperature,humidity,acid,alkali and salt.Simulation tests were used to study the relationship between the properties of rock mass and cycling tests,and X-ray diffraction( XRD),X-ray fluorescence( XRF) and scanning electron microscope( SEM) were also used to study the composition and morphology of the samples. The results show that the properties of samples get weakened due to the changes of mineral contents and micro-structure during the cycling tests. The influences from greatest to least are free-thawing cycles,salt resistance cycles,acid resistance cycles,alkali resistance cycles and temperature-humidity cycles.

关 键 词：循环作用 模拟试验 岩体性能 岩体成分 

分 类 号：P642[天文地球—工程地质学]