三峡库区红层泥岩、粗(细)砂岩干燥过程电阻率特性试验  

Experimental on Resistivity Characteristics of Red-bed Mudstone and Grit(fine)Sandstone During the Drying Process in the Three Gorges Reservoir Region

作　　者：宋健 闫磊 李辉 周裔波 程龙飞[2] 孙岩[2] SONG Jian;YAN Lei;LI Hui;ZHOU Yibo;CHENG Longfei;SUN Yan(CCCC First Highway Chongqing Wangzhou Expressway Co Ltd,Chongqing 404188,China;School of Civil Engineering,Chongqing Three Gorges University,Chongqing 404020,China)

机构地区：[1]中交一公局重庆万州高速公路有限公司,重庆404188 [2]重庆三峡学院土木工程学院,重庆404020

出　　处：《土木工程与管理学报》2021年第5期98-103,117,共7页Journal of Civil Engineering and Management

基　　金：中国博士后科学基金(2019M663442);重庆市科委、教委研究项目(cstc2018jscx-msybX0167;KJQN201901219;KJQN202001210)。

摘　　要：红层泥岩、粗砂岩和细砂岩广泛分布于三峡库区,其电阻率能表征岩石的重要物理参数。为探明岩石干燥过程中的电阻率特性,开展室内干燥试验,测得温度、岩石质量、各频率下的电阻率等参数。研究表明:岩石干燥蒸发过程可划分为三个阶段,分别为快速、减速率及稳定蒸发阶段,蒸发速率依次递减。红层泥岩、粗砂岩和细砂岩质量分别降低0.99%,1.6%,1.11%,平均蒸发速度为0.1,0.174,0.113 g/h;红层泥岩、粗砂岩、细砂岩的电阻率在干燥过程中上下波动,在低频段波动较大,在高频段波动较小;总体呈增大趋势,分别增大45.55%~84.13%,915.25%~1472.53%,25.86%~66.27%。电阻率由高至低排序为粗砂岩、细砂岩和红层泥岩。此外,电阻率随岩石孔隙率增大而增大,随电流频率的增大而降低。Red-bed mudstone,coarse sandstone and fine sandstone are widely distributed in the Three Gorges reservoir area,and their resistivity can represent important physical parameters of the rock.In order to ascertain the resistivity characteristics of the rock during the drying process,an indoor drying test was carried out,and parameters such as temperature,rock quality,and resistivity at various frequencies were measured.Research shows that the drying and evaporation process of rock can be divided into three stages,namely,rapid,deceleration rate and stable evaporation stages,with the evaporation rate decreasing successively;the quality of red-bed mudstone,coarse sandstone and fine sandstone decreased by 0.99%,1.6%and 1.11%respectively,The average evaporation rate is 0.1,0.174 and 0.113 g/h.The resistivity of red-bed mudstone,coarse sandstone,and fine sandstone fluctuates up and down during the drying process,with greater fluctuations in the low-frequency range,and less fluctuation in the high-frequency range;the overall trend is increasing,increasing by 45.55%to 84.13%,915.25%~1472.53%and 25.86%~66.27%.The resistivity is sorted from high to low into coarse sandstone,fine sandstone and red mudstone.In addition,the resistivity increases with the increase of rock porosity,and the resistivity decreases with the increase of current frequency.

关 键 词：红层泥岩 粗砂岩 细砂岩 电阻率 质量 干燥 

分 类 号：P584[天文地球—岩石学]