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基于电阻率特性的非饱和土压实度定量评价方法

ISSN号：1671-8879
期刊名称：《长安大学学报：自然科学版》
时间：0
分类：U416.1[交通运输工程—道路与铁道工程] TU47[建筑科学—结构工程;建筑科学—土工工程]
作者机构：[1]山东大学岩土与结构工程研究中心,山东济南250061
相关基金：国家重点基础研究发展计划（973计划）项目（2013CB036002,2014CB046901,2015CB058101）; 国家重大科研仪器设备研制专项（51327802）; 国家自然科学基金重点项目（51139004）;国家自然科学基金面上项目（51479104）; 山东大学基本科研业务费资助项目（2014QY007,ZR2011EEQ013）;山东大学人才引进与培养专项资金项目（2014HW012）

作者：宋杰[1], 李术才[1], 刘斌[1], 许新骥[1], 王传武[1], 聂利超[1]

关键词：道路工程, 压实度, 电阻率特性, 定量评价, 电阻率层析成像, road engineering, compaction degree, resistivity property, quantitative assessment, electrical resistivity tomography

中文摘要：

为了得到土壤压实度深部信息与分布情况,实现大范围评价,将电阻率法引入到土壤压实度评价中。在原有电阻率模型的基础上通过理论推导初步得到了电阻率与压实度理论关系的基本模型,并通过系统的室内试验研究验证了电阻率随含水率增加呈幂指数减小的规律,揭示了电阻率随压实度增加而呈幂指数减小的规律,得到了电阻率与含水率、压实度的确定性关系表达式。同时在考虑土壤压实工艺的前提下,得到了电阻率与压实度的幂指数关系公式。利用该公式,在电阻率层析成像与不等式约束反演的基础上,提出了基于电阻率特性的非饱和土压实度快速定量评价方法及其实现流程。研究结果表明：电阻率法得到的土壤压实度结果与环刀法基本一致,并可得到整个区域内压实度的分布情况,方便快捷,有较好的应用前景。

英文摘要：

The resistivity method was introduced into the assessment of soil compaction degree to obtain deep information and distribution of soil compaction degree and to achieve large-scale evaluation.The basic model of theoretical relationship between resistivity and compaction degree was obtained through theoretical deducing based on the original resistivity model.The systematic laboratory experiment results proved that resistivity decreases at the exponent sign rule with the increase of moisture content,and revealed that resistivity decreases at the exponent sign rule with the increase of compaction degree.The definite relationship expression among resistivity,moisture content and compaction degree was also obtained.Besides,an exponent sign formula on relationship between resistivity and compaction degree was obtained under the premise of considering soil compaction technology.Using the formula,this paper proposed the quantitative assessment method and the implementation process of unsaturated soil compaction degree with resistivity property was proposed based on electrical resistivity tomography and inversion with inequality constraint.The experimental results show that the result of soil compaction degree by resistivity method is basically consistent with that by the cutting ring method,and thedistribution of soil compaction degree is obtained.The method is convenient and efficient,and has a bright prospect of generalization.4tabs,15 figs,21refs.

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