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滑坡变形带中的埋地排水管一旦开裂破坏,管道中的水将直接渗入坡体中,使坡体变形加速而破坏,因此,在进行滑坡变形带中埋地管的设计时必须考虑坡体变形对管道的影响。本文讨论牵引式滑坡和推移式滑坡两种不同形式下埋地管的纵向受力和变形特性,在一定的假设条件下,推导得出两种形式滑坡中管道的弯矩、剪力、位移以及最大应力。工程实例验证表明:由于推移式滑坡中的管道有被动土压力作支撑,在相同外力作用下,推移式滑坡中的管道应力明显高于牵引式滑坡中的管道;如果在滑坡变形带中采用PVC管,因其纵向伸长率较大,变形控制条件比较容易得到满足,需将强度指标作为设计考虑的主要因素,对最大应力超过管道许用应力的可采取更换强度较高的管材或增加管道壁厚的方法来达到强度要求。
Once the buried drainage pipe in the landslide deformation zone breaks down, the water in the pipe will directly infiltrate into the slope body, accelerating and destroying the deformation of the slope body. Therefore, during the design of the buried pipe in landslide deformation zone, the slope body must be considered Deformation on the pipeline. In this paper, the longitudinal stress and deformation characteristics of buried pipe under two different forms of traction landslide and sliding landslide are discussed. Under certain assumptions, the bending moment, shear force, displacement of pipelines in two types of landslides are deduced Maximum stress. The engineering example shows that the pipeline stress in the sliding type landslide is obviously higher than that in the traction type landslide due to the passive earth pressure of the pipeline in the sliding landslide. Under the same external force, Tube, because of its large longitudinal elongation, deformation control conditions are relatively easy to be satisfied, the strength index needs to be considered as a major factor in design considerations, the maximum stress exceeding the allowable stress of the pipe can be replaced by a higher strength pipe or pipe Wall thickness method to meet the strength requirements.