基于土石混合体随机重构的路基空洞地质雷达响应特征OA
Response characteristics of ground-penetrating radar for subgrade void based on random reconstruction of soil-rock mixture
为研究土石混填路基空洞对地质雷达波的响应特征,考虑土石混合体的随机性和非均性,提出以椭圆伸缩变形法构造碎石颗粒,以随机投放和随机生长算法重构含孔隙的土石混合体细观模型,借助GprMax软件开展了土石混填路基空洞的地质雷达正演模拟,基于等效介电常数对模型的适用性进行了验证,进一步研究了路基碎石含量、孔隙率、含水率对空洞反射信号的影响规律.结果表明:电磁波传播至空洞时会强烈反射,土石混填路基中电磁波散射明显,波形模糊且波面不光滑,碎石粒径越大,反射波波形畸变越严重,可辨识度越低;碎石是引起电磁波散射的主要原因,适当的碎石含量可以增强空洞信号振幅,超过一定含量后,会造成信号衰减;孔隙率和含水率主要通过介电常数影响空洞反射信号特征.该研究可为土石混填路基空洞的地质雷达图像识别提供理论依据.
In order to study the response characteristics of geological radar waves to soil-rock mixed subgrade void,a microscopic model of soil-rock mixture with pores is built with considering the randomness and non-uniformity of soil-rock mixtures.The random placement method together with the random growth method are employed for the model,in which the gravel particle model is built by the elliptical expansion deformation method.The geological radar forward simulations of soil-rock mixed subgrade void are carried out by using GprMax software.And the applicability of the model is verified by the equivalent dielectric constant.Furthermore,the influence of subgrade roadbed gravel content,porosity,and moisture content on the reflection signal of voids are simulated.The results show that the electromagnetic waves will be strongly reflected when it propagates to the void.The electromagnetic wave scattering in the soil-rock mixed subgrade is obvious,the waveform is blurry,and the wave surface is not smooth.The larger the particle size of the gravel particle,the more severe the distortion of the reflected wave,and the lower the distinguishability.Gravel is the main cause of electromagnetic wave scattering,and an appropriate amount of gravel can enhance the amplitude of cavity signals.If it exceeds a certain amount,the signal will attenuate.The porosity and moisture content mainly affect the reflection signal characteristics of void through the dielectric constant.This study can provide a theoretical basis for the recognition of geological radar images of void in soil-rock mixed subgrade.
SHI Wenhao;WU Yifeng;ZHANG Yonghui;ZHU Xiaodan;FAN Lüye
School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China||Anhui Province Key Laboratory of Intelligent and Green Mining of Deep Coal Resources,Anhui University of Science and Technology,Huainan 232001,China||Kunshan Underground Space Technology Research Institute Co.,Ltd.,Suzhou 215337,ChinaSchool of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China||Kunshan Underground Space Technology Research Institute Co.,Ltd.,Suzhou 215337,ChinaKunshan Underground Space Technology Research Institute Co.,Ltd.,Suzhou 215337,ChinaKunshan Underground Space Technology Research Institute Co.,Ltd.,Suzhou 215337,ChinaKunshan Underground Space Technology Research Institute Co.,Ltd.,Suzhou 215337,China||Kunshan Construction Engineering Quality Inspection Center Co.,Ltd.,Suzhou 215337,China
建筑与水利
非均匀土石混合体路基空洞电磁波正演模拟
heterogeneoussoil-rock mixturesubgrade voidelectromagnetic waveforward modeling
《岩土工程学报》 2026 (1)
96-104,9
国家自然科学基金项目(42202306)苏州市科技计划(基础研究)项目(SJC2023002)深部煤炭资源智能绿色开采安徽省联合共建学科重点实验室开放课题(IGMDCR202406)This work was supported by National Natural Science Foundation of China(Grant No.42202306),Suzhou Science and Technology Plan(Basic Research)Project(Grant No.SJC2023002),Open Project of Anhui Province Key Laboratory of Intelligent and Green Mining of Deep Coal Resources,Anhui University of Science and Technology(Grant No.IGMDCR202406).
评论