探地雷达在山区铁路隧道衬砌质量工程检测应用
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摘要
探地雷达广泛用于公路路面、铁道隧道衬砌质量和地下管线探测等工程检测领域。在铁道隧道衬砌质量检测中,可以检测衬砌厚度、脱空和空洞、渗漏带、回填欠实、围岩扰动等,检测厚度精度可达厘米级。探地雷达资料的解释主要依据波相三要素:振幅、相位和频率。隧道衬砌脱空区和含水带的波形基本特征表现为衬砌带空洞同相轴连续异常区,多次波反射衰减弱;含水时表现为同相轴连续异常区,多次波强反射,且随水饱和程度振幅变化;破碎和围岩扰动带表现为同相轴不连续异常区。
Ground penetrating radar(GPR)is widely used in the engineering detection field of the road surface,the lining quality of railway tunnel,and the underground pipeline detection and so on.It is possible to detect the lining thickness,void and empty,leakage,less backfill,and disturbance of the surrounding rock in the railway tunnel lining quality inspection,with the accuracy up to centimeter level of the thickness detection.The GPR explain is based on the three characteristics of waveform:amplitude,phase and frequency.The basic waveform characteristics of tunnel lining void area and the aqueous zone is shown as fellow.The void area is of the continue anomalous reflections with the same phase,and weak attenuating of multiple reflections.The water saturated zone is of the continue anomalous reflections with the same phase,strong multiple reflections,whose amplitude is changed with the water contains.The fracture and disturbed surrounding rock is of the discontinue reflection anomalous zone.
引文
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