土质地层中隧道上覆荷载计算研究

在隧道结构计算分析时，如何计算确定作用在隧道结构上的上覆荷载的大小及分布是设计的关键。对于土质地层中的隧道，埋深较浅时上覆荷载计算时常采用全部覆土重量，而当土层较厚，隧道埋深较大时通常会采用太沙基公式、普氏压力拱理论公式及隧道设计规范公式等，这些公式在选用时尚存在一些问题，通过对比隧道在土质地层中几种公式计算的上覆荷载规律，分析各计算公式存在的问题，加以改进推导出了隧道在土质地层中竖向荷载的建议计算公式，并通过全国各地区实测数据加以验证。研究结果可为类似条件下工程的设计提供借鉴和参考。

Study on Overburden Load Calculation of Tunnel in Soil Layer

Designing the size and distribution of loads on a segment in the calculation for tunnels is critical. For shallow tunnels in soil layers, the vertical earth pressure is the whole weight above tunnel. However, for deep-seated tunnels in thick soil, the pressure is calculated by the Terzaghi theory, Promojiyfakonov theory or code formula. Some issues exist in selecting a formula. The author compares and analyzes several calculation formula of overlying load in soil tunnels andputs forward a new calculation formula used for vertical load calculation of tunnels in the soil layer. The insights provided from this study can contribute to the engineering design for similar conditions.