摘要
针对重庆大足北山石刻不同类型渗水病害,提出了各类渗水病害分级评估方法及细分标准。基于流量—等效开度立方定律总结了不同水力梯度下滴水\流水病害分级临界条件;利用热重法研究了重庆大足紫红色砂岩和灰白色砂岩结合水含量及结合水水膜厚度,提出基于浸水面积的浸水病害分级标准;通过吸湿试验考察不同湿度环境下砂岩吸湿动力学特性,基于Fick定律计算得到不同湿度环境下砂岩水分扩散系数,明确了壁挂水病害的产生条件并提出基于接触角的壁挂水病害分级标准;借助色差仪测量了重庆大足紫红色砂岩和灰白色砂岩干燥状态和湿润状态下CIE-L^(*)a^(*)b^(*)色度坐标,提出了基于不同饱水程度(含水量)砂岩色差值ΔEn的潮湿\湿润病害分级标准。
This study addresses various types of water seepage diseases affecting the Dazu Beishan Rock Carvings in Chongqing,proposing grading evaluation methods and criteria for these water-related diseases.Utilizing the cubic law of flow-equivalent opening,critical conditions for grading drip/flow water diseases under different hydraulic gradients were established.The content and film thickness of bound water in the purple-red and gray-white sandstones of Dazu were evaluated by means of thermo-gravimetric analysis,leading to the formulation of immersion disease grading based on immersed area.Hygroscopic dynamic characteristics of the sandstones were examined under varying relative humidity(RH)through hygroscopic testing,and water diffusion coefficients were calculated based on Fick’s law.Wall hanging water disease conditions were defined,and grading standards taking into account contact angle were proposed.Additionally,the CIE-L^(*)a^(*)b^(*)chromaticity coordinates of the sandstones from Dazu were measured in both dry and wet states,establishing wet/humid disease grading criteria based on the color difference valueΔEn corresponding to different saturation levels(water content).
作者
王军霞
任伟中
WANG Junxia;REN Weizhong(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,P.R.China)
出处
《重庆大学学报》
CAS
CSCD
北大核心
2024年第10期99-109,共11页
Journal of Chongqing University
基金
国家重点研发计划项目(2021YFC1523400)。
关键词
渗水病害
分级评估
结合水
吸湿动力学
色差分析
water seepage diseases
grading evaluation
bound water
hygroscopic dynamics
color difference analysis
