独乐寺观音像细泥层修复材料的性能  

Properties of repair material for the fine clay layer on the Avalokitesvara statue of Dule Temple

作　　者：秦立科[1,2] 刘海峰 甄刚 贾甲 QIN Li-ke;LIU Hai-feng;ZHEN Gang;JIA Jia(Institute for the Protection of Geotechnical Relics and Monuments,School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an,710054,China;Key Scientific Research Base of Conservation on Stone and Brick Materials of National Cultural Heritage Administration,Shaanxi Institute for the Preservation of Cultural Heritage,Xi'an 710075,China;Strategic Business and Industrial Planning System,Mingyang Smart Energy Group Co.,Ltd.,Zhongshan 528400,Guangdong,China)

机构地区：[1]西安科技大学建筑与土木工程学院,岩土文物与遗迹保护研究所,西安710054 [2]陕西省文物保护研究院砖石质文物保护国家文物局重点科研基地,西安710075 [3]明阳智慧能源集团股份公司战略业务与产业规划系统,广东中山528400

出　　处：《兰州大学学报（自然科学版）》2023年第6期803-811,共9页Journal of Lanzhou University(Natural Sciences)

基　　金：陕西省自然科学基础研究计划项目(2017JQ5069);国家重点研发计划项目(2019YFC1521000)。

摘　　要：独乐寺十一面观音像表面开裂严重且部分细泥层脱落,在修补之前需对泥塑修补材料的合理成分进行确定.通过收缩试验和间接拉伸试验(巴西劈裂试验),分析修补材料中各成分对土样性能的影响,对影响机理进行分析.结果表明,砂子和麻丝能有效改善土的干缩性能,试样的线缩率随着含砂量和含麻量的增加而减小;麻纤维能有效改善土的拉伸力学性能,使土的破坏模式由脆性破坏转为韧性破坏;土样的抗拉强度随麻纤维含量的增加先升后降,1%的麻含量可提高抗拉强度68%以上;麻丝含量不超过2%时,其在土中分布较均匀,与土体黏结密实,可显著增强土的抗拉强度;麻丝过量时因成团现象导致与土体的黏结面积减少,削弱了试样的抗拉强度.建议细泥层的修补土样配比约为含砂30%,含麻2%.The surface of the eleven-faced Avalokitesvara statue of Dule Temple is seriously cracked and some fine mud layers have fallen off.A reasonable content of the composition of the clay repair materials should be determined before repair.The influence of various components of materials on soil properties was analyzed through shrinkage test and indirect tensile test(Brazilian splitting test),and the mechanism analyzed too.The results showed that the sand and oakum fiber could effectively improve the shrinkage properties of soil,and the linear shrinkage rate of sample decreased with the increase of sand and oakum content;oakum fiber could effectively improve the tensile mechanical properties of soil and change the failure mode from brittle to ductile failure;the tensile strength of soil samples increased first and decreased with the increase of the oakum fiber content,and 1% oakum content could increase the tensile strength by more than 68%;the oakum fiber was evenly distributed and tightly bonded with soil when the content was less than 2%,which could significantly enhance the tensile strength of soil.Excessive oakum fiber would reduce the bonding area between the oakum fiber and soil due to clustering,thus weakening the tensile strength of the sample.According to the test results,the optimal proportion of the fine mud layer repair soil samples was about 30% in sand content and 2% in oakum content.

关 键 词：泥塑 砂子 麻丝纤维 收缩 巴西劈裂试验 

分 类 号：TU411[建筑科学—岩土工程]