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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第47卷

期数:

2025年第04期

页码:

646-661

栏目:

黄河流域生态保护和高质量发展专刊(下)

出版日期:

2025-07-15

文章信息/Info

Title:

Response Law and Model of Electrical Resistivity of Cement-improved Loess in Ningxia, China

文章编号:

1672-6561(2025)04-0646-16

作者:

马永智¹; 韩方元²; 3; 李龙山¹; 王杰¹; 4; 高建强⁵; 张营⁵; 薛志佳^5*

(1. 宁夏海平高速公路管理有限公司,宁夏 中卫 755000; 2. 宁夏交通建设股份有限公司,宁夏 银川 750021; 3. 宁夏回族自治区道路养护工程技术研究中心,宁夏 银川 750021; 4. 宁夏大学 土木与水利工程学院,宁夏 银川 750021; 5. 长安大学 公路学院,陕西 西安 710064)

Author(s):

MA Yong-zhi¹; HAN Fang-yuan²; 3; LI Long-shan¹; WANG Jie¹; 4; GAO Jian-qiang⁵; ZHANG Ying⁵; XUE Zhi-jia^5*

(1. Ningxia Haiping Expressway Management Co., Ltd., Zhongwei 755000, Ningxia, China; 2. Ningxia Communications Construction Co., Ltd., Yinchuan 750021, Ningxia, China; 3. Ningxia Hui Autonomous Region Road Maintenance Engineering Technology Research Center, Yinchuan 750021, Ningxia, China; 4. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, Ningxia, China; 5. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)

关键词:

湿陷性黄土;  水泥黄土;  电阻率法;  挤密桩;  多因素表征模型;  含水率;  干密度

Keywords:

collapsible loess;  cement-improved loess;  resistivity method;  compaction pile;  multi-factor characterization model;  moisture;  dry density

分类号:

TU444

DOI:

10.19814/j.jese.2024.09042

文献标志码:

A

摘要:

研究水泥黄土挤密桩的电阻率响应规律,对提高湿陷性黄土地基质量检测效率、降低检测成本具有重要意义。以宁夏海原—甘肃平川高速公路宁夏段的水泥黄土挤密桩为研究对象,通过控制电流频率、干密度、含水率和养护龄期等变量,测定水泥黄土的电阻率变化规律,并建立多因素耦合电阻率模型,以期为宁夏水泥黄土挤密桩的无损检测提供理论依据。结果表明:①在干密度为1.62～1.81 g·cm^-3、含水率为8%～14%和养护龄期为1～28 d的试验条件下,水泥黄土内部颗粒的排列方式及胶结作用使其呈现明显的频率依赖性; 在电流频率低于50 kHz时,土体表现出显著的电容器效应,导致电阻率随电流频率变化明显; 而当电流频率超过50 kHz后,电容器效应减弱,电阻率趋于稳定; ②含水率与干密度的增加会增强土体的导电性,使电阻率逐渐降低; 但当含水率超过最优含水率(11.0%)后,自由水膜连通性趋于饱和,电阻率降幅减缓; 养护龄期的延长促使水泥水化产物填充孔隙,降低离子迁移效率,导致电阻率逐渐升高。基于试验数据建立了宁夏水泥黄土电阻率与含水率、干密度、养护龄期的多因素表征模型——多因素耦合电阻率模型,其相关性良好。敏感性分析表明,各因素对电阻率的影响程度从大到小依次为含水率、干密度、养护龄期。

Abstract:

Study on the resistivity response characteristics of cement-improved loess compaction piles is of great significance for improving the quality inspection efficiency and reducing the testing costs of collapsible loess foundations. Taking the cement-improved loess compaction piles in Ningxia section of Haiyuan-Pingchuan highway from Ningxia to Gansu as the research object, variables including current frequency, dry density, moisture, and curing age were used to measure the resistivity variation patterns of cement-improved loess and establish a multi-factor coupled resistivity model, aiming to provide theoretical basis for non-destructive testing of cement-improved loess compaction piles in Ningxia. The results show that ① within the experimental conditions of dry density(1.62-1.81 g·cm^-3), moisture(8%-14%)and curing age(1-28 d), the particle arrangement and cementation effects in cement-improved loess exhibit significant frequency dependence; when the current frequency is below 50 kHz, the soil demonstrates notable capacitor effects, causing obvious resistivity variations with current frequency changes; when the current frequency exceeds 50 kHz, the capacitor effects weaken and the resistivity stabilizes; ② the increase of moisture and dry density enhances the cement-improved loess conductivity, leading to gradual reduction of resistivity; however, when moisture exceeds the optimum moisture(11.0%), the connectivity of free water films approaches saturation and the decreasing trend of resistivity slows down; the extension of curing age promotes cement hydration products to fill pores, reducing ion migration efficiency and consequently increasing resistivity gradually. Based on experimental data, a multi-factor characterization model, named as multi-factor coupled resistivity model, was established according to the resistivity of cement-improved loess in Ningxia changing with moisture, dry density and curing age, showing good correlation. Sensitivity analysis reveals that the influencing factors on resistivity are moisture, dry density and curing age in descending order.

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备注/Memo

备注/Memo:

收稿日期:2024-09-24; 修回日期:2025-03-23
基金项目:国家自然科学基金项目(41902280); 宁夏回族自治区交通运输厅项目(202200192); 陕西省高校科协青年人才托举计划项目(20210422); 中国博士后科学基金项目(2022M710486); 陕西省自然科学基础研究计划项目(2023-JC-QN-0445); 长安大学中央高校基本科研业务费专项资金项目(300102212101)
*通信作者:薛志佳(1990-),男,辽宁义县人,副教授,工学博士,E-mail:xuegeneral@126.com。

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更新日期/Last Update: 2025-07-25