Application of Transient Electromagnetic Method in Subsidence Area
of Collapsible Loess: Case Study of Chang-Yan Separate Overpass

doi:10.3969/j.issn.1674-0696.2014.02.09

Abstract

Abstract: For the specialties of subsidence problems of collapsible loess in West Henan，the transient electromagnetic method was applied to explore the resistivity response characteristics of the non-layered system in loess areas，including the chasm，fracture and collapse body of water． A program which could make a direct and dynamic query of soil moisture according to a visible resistivity ρ value was designed to realize the quick conversion of soil moisture information from the electric information． According to the case studies，10 percent of water content was the criterion of judging the collapsible area． The geophysical interpretation and prediction methods were proposed to deal with loess collapsibility problems in West Henan，and the exploration engineering was used to verify the effect of detection，which is a good example for the similar complex project．

Key words: bridge engineering, collapsible loess, transient electromagnetic method, cavity detection

摘要： 针对豫西湿陷性黄土塌陷问题的特殊性，利用瞬变电磁法探讨了黄土区陷坑、裂隙以及含水塌陷体等非层状体系的电阻率响应特征; 设计出根据土壤视电阻率ρ 值即能直接动态查询相应含水量的程序，从而实现了土壤由电性信息向含水量信息的快速转换。结合工程实例，以10% 界限含水量为场地塌陷的判别依据，提出了适合豫西黄土湿陷特点的物探解译方法和超前预报方法，并运用钻探工程验证了探测效果，为同类复杂工程提供了范例。

关键词: 桥梁工程, 湿陷性黄土, 瞬变电磁法, 空穴探测

CLC Number:

P631.325

Jiang Bo，Wang Zhirong，Jia Yakun，Zhang Limin. Application of Transient Electromagnetic Method in Subsidence Area of Collapsible Loess: Case Study of Chang-Yan Separate Overpass[J]. Journal of Chongqing Jiaotong University(Natural Science), 2014, 33(2): 40-43.

蒋博，王志荣，郏亚坤，张利民. 基于瞬变电磁法探测湿陷性黄土塌陷区 ———以常闫分离式立交桥为例[J]. 重庆交通大学学报（自然科学版）, 2014, 33(2): 40-43.

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Application of Transient Electromagnetic Method in Subsidence Area of Collapsible Loess: Case Study of Chang-Yan Separate Overpass

基于瞬变电磁法探测湿陷性黄土塌陷区 ———以常闫分离式立交桥为例

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