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Failure analysis of directional crossing pipeline and design of a protective device

机译：定向穿越管道故障分析及防护装置设计

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Failure analysis of crossing pipelines in the operation process after the completion of construction was investigated. Dent and collapse are the common failure modes of crossing pipelines in bad geological strata. The deformation processes of dent behaviour and collapse behaviour of crossing pipelines were simulated. The results show that high stress distribution extends along the axial and circumferential directions under the boulder load, and the maximum equivalent plastic strain appears at the centre of the dent. The collapse process of the crossing pipeline can be divided into six phases. The cross-section changes from an oval shape to a "gourd" shape and then to an "8"shape as the external load increases. Before buckling appears, the decrease in the cross-section area of the crossing pipeline is small. However, the cross-section area increases as the surrounding soil pressure increases after buckling appears. When the cross-section shape reaches the "8", the decrease in the cross-section area reaches a maximum value of 88.1%. To reduce the failure probability and improve the service life of the crossing pipeline, a protective device was designed for preventing damage. For the protective device, the dent rate of the protective pipeline decreases as the annulus pressure increases under the action of boulders. However, the dent rate of the crossing pipeline increases as the annulus pressure increases. Under the same stratum movement, the deformation of the crossing pipeline with the protective device is smaller than without the protective device. Therefore, the protective device can effectively protect the crossing pipeline and prevent a collapse accident. The protective device can be effectively used on any parts of the crossing pipeline in different locations due to its simple structure and convenient installation in bad geological strata. (C) 2016 Elsevier Ltd. All rights reserved.
机译：对施工结束后运营过程中交叉管道的失效进行了分析。凹坑和坍塌是不良地质层中穿越管道的常见破坏方式。模拟了交叉管道的凹痕行为和坍塌行为的变形过程。结果表明，在巨石载荷下，高应力分布沿轴向和周向分布，并且最大等效塑性应变出现在凹痕的中心。穿越管道的坍塌过程可以分为六个阶段。随着外部载荷的增加，横截面从椭圆形变为“咕gou”形，然后变为“ 8”形。在屈曲出现之前，交叉管道横截面积的减小很小。但是，横截面面积随屈曲后周围土壤压力的增加而增加。当横截面形状达到“ 8”时，横截面面积的减小达到最大值88.1％。为了降低故障概率并提高交叉管道的使用寿命，设计了一种防止损坏的保护装置。对于保护装置，在圆石的作用下，随着环空压力的增加，保护管道的凹陷率会降低。然而，随着环空压力的增加，交叉管道的凹痕率增加。在相同的地层运动下，具有保护装置的交叉管道的变形小于没有保护装置的情况。因此，该保护装置可以有效地保护交叉管道并防止倒塌事故。该保护装置结构简单，便于在不良地质层中安装，可有效地用于穿越管线不同部位的任何部位。 （C）2016 Elsevier Ltd.保留所有权利。

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