土石复合介质电阻率变化特性研究
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摘要
在最佳含水率条件下制备了土石质量比分别为9∶1,7∶3,5∶5,4∶6,压实度分别为90%,92%,95%,98%,100%的20个多相土石复合介质试件,通过测定各试件在吸水饱和过程中的电阻率变化,明确了其变化过程与土石比、压实度等物理参数间的响应规律及产生原因,同时将饱水过程中压实度与饱和度指标进行关联,最后采用非饱和岩石电阻率-饱和度关系模型对土石复合介质电阻率随饱和度变化规律进行了拟合,拟合结果总体良好.所得结果可为利用电阻率来检测土石坝坝体材料吸水饱和形成的渗漏通道提供数据支撑.
The 20 soil-rock composite media test specimens with soil-rock ratio of 9∶1,7∶3,5∶5,4∶6, and the compaction degrees of 90%,92%,95%,98%,100% were prepared in the condition of optimum water content. Through measuring the variations of resistivity during the water absorption process, the variable relationship between the resistivity and soil-rock ratio, compaction degree as well as their causes were clarified, moreover,the compaction degree and saturation index were correlated during the saturation process, finally, the unsaturated model of resistivity-saturation was used to fit the variation law of soil-rock composite media resistivity with saturation, the generally fitting results are good. This study can provide data support for the use of resistivity to detect seepage channels formed by water absorption and saturation of soil-rock dam materials.
The 20 soil-rock composite media test specimens with soil-rock ratio of 9∶1,7∶3,5∶5,4∶6, and the compaction degrees of 90%,92%,95%,98%,100% were prepared in the condition of optimum water content. Through measuring the variations of resistivity during the water absorption process, the variable relationship between the resistivity and soil-rock ratio, compaction degree as well as their causes were clarified, moreover,the compaction degree and saturation index were correlated during the saturation process, finally, the unsaturated model of resistivity-saturation was used to fit the variation law of soil-rock composite media resistivity with saturation, the generally fitting results are good. This study can provide data support for the use of resistivity to detect seepage channels formed by water absorption and saturation of soil-rock dam materials.
引文
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1)本文所涉及的比值、含水量,压实度等均为质量比或质量分数.
[2] 周启友,杭悦宇,刘汉乐,等.饱水和排水过程中岩石电阻率各向异性特征的电阻率成像法研究[J].地球物理学报,2009,52(1):281-288.ZHOU Qiyou,HANG Yueyu,LIU Hanle,et al.Study on resistivity imaging of rock resistivity anisotropy in saturated water and drainage process[J].Chinese Journal of Geophysics,2009,52(1):281-288.(in Chinese)
[3] 孙树林,李方,谌军.掺石灰黏土电阻率试验研究[J].岩土力学,2010,31(1):51-55.SUN Shulin,LI Fang,CHEN Jun.Experimental study on resistivity of lime-clay[J].Rock-Soil Mechanics,2010,31(1):51-55.(in Chinese)
[4] 付伟,汪稔,胡明鉴,等.不同温度下冻土单轴抗压强度与电阻率关系研究[J].岩土力学,2009,30(1):73-78.FU Wei,WANG Ren,HU Mingjian,et al.Study on relationship between uniaxial compressive strength and resistivity of frozen soil at different temperatures[J].Rock-Soil Mechanics,2009,30(1):73-78.(in Chinese)
[5] 付伟,汪稔.饱和粉质黏土反复冻融电阻率及变形特性试验研究[J].岩土力学,2010,31(3):769-774.FU Wei,WANG Ren.Experimental study on resistivity and deformation characteristics of saturated silty clay under repeated freeze-thaw cycles[J].Rock-Soil Mechanics,2010,31(1):769-774.(in Chinese)
[6] 查甫生,刘松玉,杜延军,等.非饱和黏性土的电阻率特性及其试验研究[J].岩土力学,2007,28(8):1671-1676.ZHA Fusheng,LIU Songyu,DU Yanjun,et al.Resistivity properties and experimental study of unsaturated cohesive soil[J].Rock-Soil Mechanics,2007,28(8):1671-1676.(in Chinese)
[7] 汪魁.多相土石复合介质电阻率特性理论及应用研究[D].重庆:重庆交通大学,2013.WANG Kui.Study on the theory and application of resistivity characteristics of multiphase soil-rock composite media[D].Chongqing:Chongqing Jiaotong University,2013.(in Chinese)
[8] SAVA D,HARDAGE B A.Rock physics characterization of hydrate-bearing deepwater sediments[J].The Leading Edge,2006,25(5):616-619.
[9] 刘洋.基于波电场成像的陆域填方压实质量评价方法研究及应用[D].重庆:重庆交通大学,2012.LIU Yang.Research and application of compaction quality evaluation method of land filling based on wave electric field imaging[D].Chongqing:Chongqing Jiaotong University,2012.(in Chinese)
[10] 朱俊高,李翔,徐佳成,等.粗粒土浸水饱和时间试验研究[J].重庆交通大学学报(自然科学版),2016,35(1):85-89.ZHU Jungao,LI Xiang,XU Jiacheng,et al.Experimental study of saturation time of coarse-grained soil[J].Journal of Chongqing Jiaotong University(Natural Science),2016,35(1):85-89.(in Chinese)
[11] 于小军.电阻率结构模型理论的土力学应用研究[D].南京:东南大学,2004.YU Xiaojun.Resistivity structure model theory of soil mechanics application research[D].Nanjing:Southeast University,2004.(in Chinese)
[12] 袁聚云,钱建固,张宏鸣,等.土质学与土力学[M].4版.北京:人民交通出版社,2014:13-16.YUAN Juyun,QIAN Jianguo,ZHANG Hongming,et al.Soil science and soil mechanics[M].4th Edition.Beijing:People's Communications Press,2014:13-16.(in Chinese)
[13] ARICHIE G E.The electrical resistivity log as an aid in determining some reservoir characteristics[J].Transaction of American Institute of Mining Engineers,1942,146:54-62.
1)本文所涉及的比值、含水量,压实度等均为质量比或质量分数.