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泥石流灾害是震后危害最大的次生山地灾害,已成为山区防灾减灾和制约当地社会经济发展的突出问题。快速科学地计算震后泥石流淤埋强度和宽度,并在此基础上进行淤埋强度评估,对灾后重大工程选址重建和保障公共安全具有重要意义。以震区汶川县映秀镇红椿沟泥石流为研究对象,在野外考察、试验研究和计算分析的基础上,建立了泥石流淤埋厚度、宽度和强度评估模型,进行红椿沟泥石流淤埋强度评估。研究表明:(1)红椿沟泥石流淤埋厚度评估结果为11.07 m,实测结果为10.5 m,绝对误差为+0.57 m、相对误差5.1%;(2)泥石流淤埋宽度评估结果为174.66 m,实测结果为180.3 m,绝对误差为-5.64 m、相对误差3.2%;(3)泥石流淤埋强度指数为4.6,为极高强度,具有极高的冲淤能力和危险性;(4)建立的评估模型具有较高的精度,但还需要在野外考察和实验分析的基础上,对重要参数作进一步的修正。研究结果为震区都汶公路及其跨沟桥梁设计施工和防治工程优化设计提供了科学依据和技术支持。
Debris flow disaster is the most serious secondary mountain disaster after the earthquake. It has become a prominent problem in disaster prevention and mitigation in mountain area and restricting local social and economic development. Quickly and scientifically calculating the strength and width of the debris flow after the earthquake and evaluating the strength of the silt on this basis is of great significance to the rebuilding of major projects and the protection of public safety after the disaster. Taking the debris flow of Hongchungou Gully in Yingxiu town of Wenchuan County as the research object, based on field investigation, experimental study and calculation, the evaluation model of thickness, width and strength of debris flow in debris flow was established, . The results show that: (1) The results of the evaluation of the muddy silt thickness in Hongchungou Gully are 11.07 m, the measured result is 10.5 m, the absolute error is +0.57 m and the relative error is 5.1%; (2) The measured result is 180.3 m, the absolute error is -5.64 m, and the relative error is 3.2%. (3) The muddy silt silt intensity index is 4.6, which is extremely high strength and has extremely high scouring and silting ability and danger. (4) The evaluation model has higher accuracy, but also needs to be further amended on the basis of field investigation and experimental analysis. The research results provide scientific basis and technical support for the design optimization and design of Du-Wen Highway and its Gou-Gou Bridge.