筒仓贮料压力分析及其应用
发布时间：2019-06-26 08:37
【摘要】：筒仓是一种用来储存各种散体材料的筒状构筑物。由于其具有占地面积少、仓容量大、使用方便等优点,故在粮食,建筑、煤炭、水泥等行业被广泛应用。近几十年来,随着经济建设的发展,国内筒仓数量越来越多。在筒仓结构设计中,选取正确的贮料压力值是保证筒仓安全可靠的前提。现今,国内外筒仓规范对于贮料压力的计算都是以Janssen公式为基础的,但大量事实表明利用该公式得到的结果与实际情况有较大的出路。故选取合适的方法对筒仓贮料压力进行深入的研究很有必要。 到目前为止,国内外大量学者就这一问题进行了分析和研究,但由于散体材料自身的复杂性,使得筒仓贮料压力理论在很多地方难达到共识,从而导致大量的筒仓事故发生。 本文以武汉青山区“7.9”筒仓倒塌事故为背景,采用试验研究、理论分析和数值模拟相结合的方法,对筒仓各工况下的贮料压力进行研究,同时将结果运用到事故筒仓,对其进行事故分析,具体工作包括： 1.对筒仓进行了模型试验研究,得出筒仓在静止及卸料时的仓壁侧压力,并与规范结果进行对比发现利用规范计算得到的贮料压力值要比实际情况小。 2.在考虑筒仓内贮料产生土拱效应的基础上建立了筒仓贮料压力的计算公式；通过与试验数据及模拟结果对比,验证了该公式的正确性。 3.采用离散元软件对筒仓静止及卸料时的贮料压力进行了模拟,得到了筒仓在各工况下的压力分布规律,同时分析了各个参数对侧压力的影响。 4.通过观察筒仓卸料时颗粒的流动,得出贮料在卸料时由于流型转变而产生的散体拱是造成卸料超压的主要原因,同时由于贮料流动时的结拱-破拱导致筒仓卸料时仓壁侧压力会不断的上下波动。 5.对筒仓卸料时的模拟发现当筒仓孔球径比达到6.0左右是会出现闭塞现象,同时内摩擦系数越大越易发生卸料闭塞。 6.将离散元模拟与有限元分析相结合能很好的对筒仓进行结构研究,这样得出的结果将比以往分析方法更加精确,能为今后的筒仓设计提供新的思路。
[Abstract]:Silo is a cylindrical structure used to store all kinds of bulk materials. Because of its small area, large warehouse capacity, easy to use and other advantages, it is widely used in grain, construction, coal, cement and other industries. In recent decades, with the development of economic construction, the number of silos in China is increasing. In the structural design of silo, selecting the correct storage pressure value is the premise to ensure the safety and reliability of silo. Nowadays, the calculation of storage pressure in silo code at home and abroad is based on Janssen formula, but a large number of facts show that the results obtained by this formula have a great way out with the actual situation. Therefore, it is necessary to select the appropriate method to study the silo storage pressure. Up to now, a large number of scholars at home and abroad have analyzed and studied this problem, but because of the complexity of bulk materials themselves, it is difficult to reach a consensus on silo pressure theory in many places, which leads to a large number of silo accidents. Based on the collapse accident of "7.9" silo in Qingshan District of Wuhan, this paper studies the storage pressure of silo under various working conditions by means of experimental research, theoretical analysis and numerical simulation. At the same time, the results are applied to the accident silo and the accident analysis is carried out. The concrete work includes: 1. The model test of the silo is carried out, and the side pressure of the silo wall is obtained when the silo is static and unloaded, and compared with the code results, it is found that the storage pressure calculated by the code is smaller than the actual situation. two銆，
本文编号：2506065
[Abstract]:Silo is a cylindrical structure used to store all kinds of bulk materials. Because of its small area, large warehouse capacity, easy to use and other advantages, it is widely used in grain, construction, coal, cement and other industries. In recent decades, with the development of economic construction, the number of silos in China is increasing. In the structural design of silo, selecting the correct storage pressure value is the premise to ensure the safety and reliability of silo. Nowadays, the calculation of storage pressure in silo code at home and abroad is based on Janssen formula, but a large number of facts show that the results obtained by this formula have a great way out with the actual situation. Therefore, it is necessary to select the appropriate method to study the silo storage pressure. Up to now, a large number of scholars at home and abroad have analyzed and studied this problem, but because of the complexity of bulk materials themselves, it is difficult to reach a consensus on silo pressure theory in many places, which leads to a large number of silo accidents. Based on the collapse accident of "7.9" silo in Qingshan District of Wuhan, this paper studies the storage pressure of silo under various working conditions by means of experimental research, theoretical analysis and numerical simulation. At the same time, the results are applied to the accident silo and the accident analysis is carried out. The concrete work includes: 1. The model test of the silo is carried out, and the side pressure of the silo wall is obtained when the silo is static and unloaded, and compared with the code results, it is found that the storage pressure calculated by the code is smaller than the actual situation. two銆，
本文编号：2506065
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