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本文针对浅埋地下结构的顶板(简化成简支梁的单向板)用弹性理论分析和模型试验研究了复土对地下结构梁自振频率的影响。由计算与实验表明: 1.对于弹性模量较低的复土(如粘土),结构的自振频率随复土厚度增加而降低; 2.对于弹性模量较高的复土(如干砂),结构的自振频率在复土很薄时稍下降,但随着复土增加,结构频率却不断增加。由计算和实验还表明,不论何种复盖介质,当复土厚度超过结构跨度约2/3以后,结构的自振频率几乎不再变化。
In this paper, the elasticity theory analysis and model test of the shallow-buried underground structure roof (simply reduced to a simply-supported one-way slab) are used to study the influence of the complex soil on the natural vibration frequency of the underground structural beam. The calculations and experiments show that: 1. For complex soils with low elastic modulus (such as clay), the natural vibration frequency of the structure decreases with increasing thickness of the complex soil; 2. For complex soils with high elastic modulus (such as dry sand The frequency of the natural vibration of the structure is slightly decreased when the complex soil is thin, but the frequency of the structure increases as the complex soil increases. Calculations and experiments have also shown that regardless of the overlaying medium, the natural vibration frequency of the structure hardly changes when the thickness of the complex soil exceeds about 2/3 of the structural span.