全风化软岩填料电阻率特性影响因素试验研究

Experimental Study on Influencing Factors of Resistivity Characteristics of Fully Weathered Soft Rock Packing

为研究全风化软岩填料的电阻率特性,对其开展不同粒径和不同级配的室内试验,探明含水率、粒径和粗颗粒含量等因素对风化软岩填料电阻率特性的影响。试验结果表明:全风化软岩填料颗粒粒径越大、粗颗粒含量越多越不容易导电,全风化粉砂岩导电性略低于全风化泥质砂岩。总体来说电阻率随含水率的增大而减小,其下降趋势大致分为3个阶段,即快速下降、缓慢下降和平缓稳定阶段。全风化泥质砂岩填料的电阻率与其粗颗粒含量有关,当含水率小于14%时,粗颗粒含量对电阻率产生较大影响。土体电阻率与含水率之间呈幂指函数相关,并初步揭示了土体电阻率与干密度、含水率、粗颗粒含量之间的联系,为全风化软岩填料路基填筑及其压实质量检测提供理论依据。

In order to study the resistivity characteristics of fully weathered soft rock fillers,laboratory tests with different particle sizes and gradations are carried out to find out the influence of water content,particle size and coarse particle content on the resistivity characteristics of weathered soft rock fillers.The test results show that the larger the particle size and the more the content of coarse particles,the less conductive it is,and the conductivity of the weathered siltstone is slightly lower than that of the weathered argillaceous sandstone.In general,the resistivity decreases with the increase of water content,and the downward trend can be roughly divided into three stages,namely,the rapid decline,the slow decline and the gradual gradual and stable stage.The resistivity of fully weathered argillaceous sandstone filler is related to the content of coarse particles.When the water content is less than 14%,the content of coarse particles has a great influence on the resistivity.The correlation between the soil resistivity and water content is a power index function,and the relationship between the soil resistivity and dry density,water content and coarse particle content is preliminarily revealed,which provides a theoretical basis for the compaction quality detection of fully weathered clay soft rock filler.