基于EDEM的混凝土垂直溜送研究
Research on Concrete Vertical Transport Based on EDEM

垂直溜送是大断面、大深度竖井施工中大体量混凝土的主要输送方式，具有重力输送低能耗低成本、连续入仓高效快捷、地面场地易布置等突出优点。但由于落差大、落速高，易发生混凝土离析，严重影响混凝土输送效果和浇筑质量。上述问题的基本解决思路是在溜管中安装缓冲装置，进而控制混凝土落速。本文通过离散元软件EDEM对混凝土颗粒进行参数标定，使用JKR接触模型来对混凝土的骨料颗粒进行建模，以颗粒表面能的大小来表征混凝土颗粒之间的黏结度，模拟混凝土颗粒在垂直溜送中的动态变化，分析不同角度的挡板缓冲装置对其速度变化的影响，为混凝土垂直溜送技术提供理论依据。
Vertical transportation is the main transportation method of large-volume concrete in the construction of large-section and large-depth vertical shaft. It has such outstanding advantages as low energy consumption and low cost of gravity transportation, efficient and quick continuous warehousing, and easy layout of ground and site. However, due to the large drop and high falling speed, concrete segregation is easy to occur, which seriously affects the concrete conveying effect and pouring quality. The basic solution to the above problem is to install a buffer device in the pipeline to control the concrete speed. In this paper, the discrete element software EDEM is used to carry out parameter calibration of concrete particles, and the JKR contact model is used to model the aggregate particles of concrete. The surface energy of particles is used to characterize the bonding degree between concrete particles, simulate the dynamic changes of concrete particles in vertical transportation, and analyze the influence of different angle baffle buffering devices on their velocity changes. It provides theoretical basis for concrete vertical transportation technology.