立方排列水泥球体通风性能及参数试验研究

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摘要由于块石层具有较好的通风换热特性，使得块石护坡和块石路基在青藏铁路建设中得到广泛的应用，并起到良好的降温效果。块石层中的空气流动规律已成为目前研究的热点问题，但块石的大小、形状和堆砌方式的随机性使得直接进行块石通风试验时，得到的结果具有很大的偶然性和不确定性。为解决这一问题，采用风洞室内模型试验对不同直径立方排列水泥球体层的渗透率及惯性阻力系数进行研究，试验选用的水泥球体直径为0.15，0.20，0.25，0.30 m，立方排列球体的孔隙率均为0.476。风洞试验结果表明：水泥球体层内部压力梯度与渗流速度之间存在良好的二次非线性关系；随着球体直径的增大，渗透率随之增大，而惯性阻力系数随之减小。

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关键词 ：岩石力学, 立方排列水泥球体, 渗透率, 惯性阻力系数, 试验研究

Abstract：The block stones are widely used in Qinghai—Tibet railway construction due to the characteristics of good ventilation and heat transfer ability. It plays a positive effect on cooling permafrost. The air flow law inside the block stone layer has become a hot issue. But the particle size and shape of block stones are all irregular，and the packing methods are also random. Therefore，if directly conducting the ventilation experiment with block stone layer，the results obtained are accidentally and uncertainly. In order to avoid all above disadvantages，the permeability and inertial resistance coefficient of layer of cubic arranged cement ball with different diameters are studied by using wind tunnel tests. The diameters of balls are 0.15，0.20，0.25 and 0.30 m，respectively，and the porosities of cubic arranged cement balls were all 0.476. Results of the wind tunnel tests show that the internal pressure gradient of the cement ball layer has a good nonlinear quadratic curve relationship with the seepage velocity. The permeability and the inertial resistance coefficient are related to the diameter of cement balls. With the increase in the diameter of cement balls，the permeability increases and the inertial resistance coefficient decreases.

Key words： rock mechanics cubic arranged cement balls permeability inertial resistance coefficient experimental study

收稿日期: 2010-02-08

引用本文:

童刚强，李东庆，张明义. 立方排列水泥球体通风性能及参数试验研究[J]. 岩石力学与工程学报, 2011, 30(S1): 2798-2802.
TONG Gangqiang，LI Dongqing，ZHANG Mingyi. EXPERIMENTAL STUDY OF VENTILATION PROPERTY AND PARAMETERS OF CUBIC ARRANGED CEMENT BALLS. , 2011, 30(S1): 2798-2802.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS1/2798

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