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5.12汶川大地震造成了大量山体震裂变形,形成了众多次生潜在灾害。这类震裂变形的深部特征是控制斜坡稳定性和发展演化规律的关键。本文以探地雷达为主要手段,结合探槽开挖验证对比,选择实例震裂边坡,对震裂变形的深部特征及探地雷达图像显示特点进行了研究。研究结果认为,斜坡震裂变形破坏深度一般不超过2m,裂缝近垂直向下发育,少数微倾坡外,探地雷达反射图像显示为双曲线特征,总体构成封口状“八”字形。研究成果为快速、有效探测震裂裂缝,尤其是垂向裂缝的深部扩展特征提供了有效参考方法,同时也为防灾减灾提供了技术支撑。
5.12 Wenchuan earthquake caused a large number of mountain fissure deformation, the formation of a number of secondary potential disaster. The deep features of such deformation are the keys to control the stability and development of the slope. In this paper, ground penetrating radar is taken as the main method. Combined with the verification of trench excavation, a case study of shattering slopes is selected to study the deep features of the deformation and the image display characteristics of ground penetrating radar. The results show that the depth of deformation of the slope is not more than 2m, the fractures develop nearly vertically, and the reflected images of ground penetrating radar show hyperbolic characteristics except for a few slopes. The research results provide an effective reference method for rapid and effective detection of deep fractures, especially for vertical fractures, and provide technical support for disaster prevention and mitigation.