海底管线地基土体塑性及剪切破坏分析  

Soil Plasticity and Shear Failure Properties of Pipeline Foundation

作　　者：赵波[1] 高福平[1] 雒承才[1] 

机构地区：[1]中国科学院力学研究所,北京100080

出　　处：《船海工程》2008年第2期95-99,共5页Ship & Ocean Engineering

摘　　要：提出一种分析管线地基极限承载力的平面应变有限元模拟方法,采用自适应网格技术和接触对算法模拟管线嵌入土体的准静态过程,利用修正Drucker-Prager/Cap本构模型模拟土体塑性。研究不同土性和管土界面摩擦条件下,管线地基土体的塑性变形及位移场特性。利用载荷沉降曲线并结合地基塑性应变分布图和位移矢量图,可判别管线地基的剪切破坏型式、确定地基极限承载力。A plane-strain finite-element method is proposed for analysis of the bearing capacity of pipeline foundation. In this method, the adaptive grid technique and ＇contact pair＇ arithmetic are adopted to simulate the quasi-static process of the pipeline penetrating into seabed, and the modified Drucker-Prager /Cap model is used to model the soil plasticity. Based on the numerical results, the characteristics of plastic deformation and displacement vector fields are investigated for various soil material properties and pipe-soil interface friction conditions. According to the obtained self-weight/load-displacement curve, concurrently referring to the plastic strain field and soil displacement vector field, the shear failure type and the bearing capacity of pipeline foundations can be determined.

关 键 词：海底管线 海床 剪切破坏 极限承载力 

分 类 号：TV139.2[水利工程—水力学及河流动力学]