大足大佛湾石刻岩石微观与力学特性研究  

Microscopic and mechanical characteristics of rocks near Big Buddha Bay Rock Carvings in Dazu

作　　者：张鑫鑫[1,2] 任伟中[1,2] 吴习文 刘海康 符贵军[1,2] Zhang Xinxin Ren Weizhong Wu Xiwen Liu Haikang Fu Guijun(State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China University of Chinese Academy of Sciences, Beijing 100049, China Highway Administration of Xingshan County, Xingshan 443700, China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]中国科学院大学,北京100049 [3]兴山县公路管理局,湖北兴山443700

出　　处：《武汉科技大学学报》2017年第4期314-320,共7页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(51379201);国家自然科学基金青年科学基金项目(51404239)

摘　　要：为了给大佛湾石刻造像的病害治理提供依据,采用X射线衍射、光学显微镜、扫描电镜和岩石力学试验系统等对该区域内岩样的矿物成分、微观结构和力学特性进行分析。结果表明,石刻区域内岩石的矿物成分以石英、钠长石、方解石、黏土矿物为主,且由于黏土矿物和方解石的含量与分布不同,造成了砂岩外观颜色的差异;区域内岩层没有变形改造,砂岩内部存在较多微孔隙而泥质砂岩、泥岩的结构较为致密,且水对岩石的结构有溶蚀、淋滤等破坏;区域内岩石的力学性质受黏土矿物的影响较大,通过力学试验得出的基本力学参数显示,与天然状态相比,岩样在饱水状态下的强度明显降低。In order to provide reference for disease management of the stone statues in Big Buddha Bay,mineral composition,microstructure and mechanical properties of the rock samples were analyzed by X-ray diffraction,optical microscopy,scanning electron microscopy and rock mechanics test system.The results show that mineral composition of the rocks in the stone carving area mainly includes quartz,albite,calcite and clay minerals,and different contents and distribution of the clay minerals and calcite result in different appearances and colors of the sandstone samples.There is no deformation in the rook strata in this area.Many micro-pores exist in sandstone and the structures of argillaceous sandstone and mudstone are denser.Corrosion and leaching by water damage the structure of the rocks.Clay minerals have a great influence on the mechanical properties of the rocks in this region.Basic mechanical parameters obtained by mechanical tests indicate that strength of water-saturated rock samples is significantly lower than that of rock samples in the natural state.

关 键 词：大足石刻 大佛湾 岩石 矿物成分 微观结构 力学性质 黏土矿物 

分 类 号：TU45[建筑科学—岩土工程]