|Table of Contents|

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

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

Issue:
2025年第04期
Page:
646-661
Research Field:
黄河流域生态保护和高质量发展专刊(下)
Publishing date:

Info

Title:
Response Law and Model of Electrical Resistivity of Cement-improved Loess in Ningxia, China
Author(s):
MA Yong-zhi1HAN Fang-yuan23LI Long-shan1WANG Jie14GAO Jian-qiang5ZHANG Ying5XUE Zhi-jia5*
(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)
Keywords:
collapsible loess cement-improved loess resistivity method compaction pile multi-factor characterization model moisture dry density
PACS:
TU444
DOI:
10.19814/j.jese.2024.09042
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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Last Update: 2025-07-25