侧压系数是用来描述地应力状态的一个物理量，它是指某点两个水平主应力的平均值和垂直应力的比值，即(σh1+σh2)/ 2σv。在浅部地层，侧压系数较大，变化范围也较大。越往深部，侧压系数持续减小，波动范围也变小，总体上呈向静水压力过渡的趋势。
因为人们对初始地应力的了解有限，分析设计中往往用侧压系数来控制初始地应力的作用范围。
Because of limited knowledge, people usually use side pressure coefficient to control the scale of the geostatic stress in the analysis and design.
以膨胀石墨模压成型填料、石棉线浸渍聚四氟乙烯编织填料和碳素纤维编织填料为试验样品，实验确定了单圈填料的侧压系数。
The graphite molded packing, the asbestos thread PTFE-greased braided packing and the carbon-fibre braided packing were tested and the coefficients of a cycle ring were experimentally determined.
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