沉入式大圆筒防波堤稳定性分析的有限元强度折减法  

Stability analysis of the embedded large cylinder breakwater by strength reduction FEM

作　　者：王元战[1] 蔡雅慧[1] 

机构地区：[1]天津大学建筑工程学院天津市港口与海岸工程重点实验室,天津300072

出　　处：《交通科学与工程》2012年第3期47-53,共7页Journal of Transport Science and Engineering

基　　金：国家自然科学基金项目(50979069);天津市科技支撑计划重点项目(10JCYBJC03400);天津市自然科学基金项目(10SYSYJC27300)

摘　　要：沉入式大圆筒结构的抗滑、抗倾稳定性是靠地基土的嵌固作用来维持的,可通过弱化土体强度来实现对结构极限破坏状态的模拟.在该假设的基础上,建立了沉入式大圆筒防波堤稳定性分析的有限元强度折减法.结合某工程实例,利用有限元强度折减法,分析了沉入式大圆筒防波堤结构的稳定性,并与加载系数法计算结果进行了比较.分析结果表明:用强度折减法与加载系数法计算所得的结构稳定性安全系数吻合得很好,适用于防波堤结构的稳定性分析.强度折减法只需对土体的强度进行弱化,操作方便,并克服了加载系数法的缺点,适用于作用荷载复杂的结构物稳定性分析.Embedded large cylinder structure maintains its stability against sliding and overturning by the embedded effect of the foundation soil,and it is feasible to simulate the structural limit failure state by weakening the strength of the soil.On the basis of this assumption,the strength reduction FEM for the stability analysis of the embedded large cylinder breakwater is developed.Combining with an engineering practice,the strength reduction FEM is used for the stability analysis of embedded large cylinder breakwater structure,and the calculated results are compared with the loading coefficient method.The results show that the stability safety factor calculated by the strength reduction FEM is consistent with the results from the loading coefficient method,and the strength reduction method is suitable for the structural stability analysis of the breakwater.Strength reduction method is easy for application because it is only needed to weaken the soil strength,effectively overcomes the disadvantages of the loading coefficient method,and is suitable for stability analysis of structures with complex external loads.

关 键 词：强度折减法 加载系数法 沉入式大圆筒防波堤 稳定性分析 

分 类 号：U656.24[交通运输工程—港口、海岸及近海工程]