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通过对兰新铁路百里风区戈壁风沙流进行现场观测研究,提出风沙流密度的新概念,解决风沙流研究中如何利用现场定时观测研究风沙流动态变化特点的重大技术难题。根据现场实测资料分析,揭示风沙流密度沿高度变化的特点,不同高度风沙流密度与风速的关系,阐明临界风速的概念,认为风区建(构)筑物所承受的压强为净风压与沙粒冲击压之和。在自然风速超过临界风速情况下,风区建(构)筑物所承受风沙流压强以沙粒与建(构)筑物碰撞压力为主,这与传统设计中以净风压作为风荷载设计完全不同,解决了风区工程设计中遇到的技术难题,避免由于对戈壁风沙流的认识不足而造成的损失,对即将修建的兰新二线提供一定的借鉴和参考,对戈壁地区风沙流科学的完善也具有一定的意义。
Through the on-the-spot observation of the Gobi wind and sand flow in the Baili area of the Lan-Xin Railway, a new concept of wind-blown flow density is put forward to solve the major technical problems of how to make use of the on-site timed observation to study the dynamic characteristics of wind-blown sand flow in the research of wind-blown sand flow. According to the analysis of the measured data in the field, the relationship between wind flow density and wind speed at different heights is revealed, and the concept of critical wind speed is clarified. Sand impact pressure and the sum. When the natural wind speed exceeds the critical wind speed, the pressure of wind and sand flow in the wind building (structure) is mainly influenced by the collision pressure between the sand and the building (structure), which is the same as the traditional design with the net wind pressure as the wind load design Completely different, the technical problems encountered in the engineering design of the wind area are solved, the losses caused by the lack of understanding of the sand flow in the Gobi area are avoided, and certain reference and reference are made to the second line of the construction of the Lanxin Second Line. The perfect also has some significance.