Numerical investigation on failure modes of bell-spigot jointed ductile iron pipelines subjected to dip-slip faults with different dip angles

Chen Q.; Ni P.; Qin X.

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Numerical investigation on failure modes of bell-spigot jointed ductile iron pipelines subjected to dip-slip faults with different dip angles

机译：Numerical investigation on failure modes of bell-spigot jointed ductile iron pipelines subjected to dip-slip faults with different dip angles

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? 2023 Elsevier LtdEffective identification of failure modes for buried pipes subjected to earthquake-induced fault movements is crucial in the design and assessment of underground water supply networks. For bell-spigot jointed ductile iron (DI) pipes, the relationship between pipe failure mode and dip angle is still unclear. In this study, a three-dimensional finite element model of buried DI pipelines crossing dip-slip faults perpendicularly is established, based on which the joint kinematics and mechanical responses of DI pipes subjected to dip-slip faults with a dip angle between 50° and 130° are systematically evaluated. Four failure modes controlling the joint sealing performance and structural integrity of DI pipes are identified, i.e., joint pull-out failure, joint rotation failure, joint compressive failure, and excessive local buckling in the pipe segment. The results reveal that joint self-locking induced by the action of horizontal compression can reduce the joint rotational capacity greatly, rendering a segmented pipeline to behave like a continuous pipeline. Upon the occurrence of joint self-locking, the pipe mode changes from kinematic-controlled failure (joint pull-out or rotation failure) to mechanical-controlled failure (joint compressive failure or excessive local buckling). Finally, the relationship between failure mode and allowable dip angle is derived for use in design.

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《Tunnelling and underground space technology》 |2023年第3期|104982.1-104982.16|共16页
作者
Chen Q.; Ni P.; Qin X.;
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作者单位

School of Civil Engineering Sun Yat-sen University||Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)||Guangdong Key Laboratory of Oceanic Civil Engineering||Guangdong Research Center for Underground Space Exploitation Technology;

School of Civil Engineering Sun Yat-sen UniversitySchool of Civil Engineering Sun Yat-sen UniversitySchool of Civil Engineering Sun Yat-sen UniversitySchool of Civil Engineering Sun Yat-sen University||Southern Marine Science and Engineering Guangdong Lab;

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正文语种英语
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Bell-spigot joint; Dip angle; Dip-slip fault; Ductile iron pipe; Failure mode; Joint self-locking;

Numerical investigation on failure modes of bell-spigot jointed ductile iron pipelines subjected to dip-slip faults with different dip angles

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