直槽沟埋式管道的垂直土压力计算模型

针对沟埋式管道中的钢塑转换结构件受到土壤载荷作用,容易发生断裂与变形而导致结构件失效,进而导致管道发生泄漏的问题,运用双剪切统一强度理论,推导并建立了适用于刚、柔性埋地管道的垂直土压力计算模型,通过算例对所建模型的有效性进行了分析与验证.研究结果表明:该模型考虑了主应力和回填土的影响,相较于马斯顿理论,该模型计算的压力降低了40%,为直槽沟埋式管道的垂直土压力计算提供一种新方法.

Vertical earth pressure calculation model for buried pipelines with straight grooves

In order to solve the problem that the steel-plastic conversion structure parts in the trench pipeline, which are subject to the soil loading, are easy to deform and fracture, leading further to the failure of the structure parts and the leakage of the pipeline, a soil-caused vertical pressure calculation model, which is based on the theory of double shear unified strength, for rigid/flexible buried pipeline has been derived and established in this paper. The validity of the model is analyzed and verified by our examples calculated. The proposed model takes effects of main stress as well as back-filling soil into account. It is therefore shown that compared with Marston's theory the pressure value calculated by our model is reduced by 40%, which provides a new method for soil-caused vertical pressure calculation for straight groove buried pipeline.