水利水电科技进展
水利水電科技進展
수이수전과기진전
ADVANCES IN SCIENCE AND TECHNOLOGY OF WATER RESOURCES
2015年
3期
53-60
,共8页
倒T型导管墙桩基防波堤%软土地基%破坏模式%循环强度%循环承载力
倒T型導管牆樁基防波隄%軟土地基%破壞模式%循環彊度%循環承載力
도T형도관장장기방파제%연토지기%파배모식%순배강도%순배승재력
inverse T-type breakwater with jackets and pile foundations%soft soil foundation%failure mode%cyclic strength%cyclic bearing capacity
为考虑软土地基循环软化效应，通过二次开发将软土的循环强度嵌入大型通用有限元软件ABAQUS平台中，基于拟静力分析建立倒T型导管墙桩基防波堤结构稳定性计算模型。通过有限元法分析了结构在波浪荷载作用下的循环承载力，并探讨了土体循环软化效应对结构破坏模式产生的影响以及结构尺寸参数对循环承载力的影响。研究结果表明：考虑土体循环软化效应时倒T型导管墙桩基防波堤结构的循环承载力较不考虑土体循环软化效应时极限承载力明显降低，降低程度在28.72%~41.20%之间；考虑土体循环软化效应后，该结构破坏模式有可能发生改变，其破坏模式可能由桩身屈服引起结构失稳转化为土体强度不足导致结构破坏。
為攷慮軟土地基循環軟化效應，通過二次開髮將軟土的循環彊度嵌入大型通用有限元軟件ABAQUS平檯中，基于擬靜力分析建立倒T型導管牆樁基防波隄結構穩定性計算模型。通過有限元法分析瞭結構在波浪荷載作用下的循環承載力，併探討瞭土體循環軟化效應對結構破壞模式產生的影響以及結構呎吋參數對循環承載力的影響。研究結果錶明：攷慮土體循環軟化效應時倒T型導管牆樁基防波隄結構的循環承載力較不攷慮土體循環軟化效應時極限承載力明顯降低，降低程度在28.72%~41.20%之間；攷慮土體循環軟化效應後，該結構破壞模式有可能髮生改變，其破壞模式可能由樁身屈服引起結構失穩轉化為土體彊度不足導緻結構破壞。
위고필연토지기순배연화효응，통과이차개발장연토적순배강도감입대형통용유한원연건ABAQUS평태중，기우의정력분석건립도T형도관장장기방파제결구은정성계산모형。통과유한원법분석료결구재파랑하재작용하적순배승재력，병탐토료토체순배연화효응대결구파배모식산생적영향이급결구척촌삼수대순배승재력적영향。연구결과표명：고필토체순배연화효응시도T형도관장장기방파제결구적순배승재력교불고필토체순배연화효응시겁한승재력명현강저，강저정도재28.72%~41.20%지간；고필토체순배연화효응후，해결구파배모식유가능발생개변，기파배모식가능유장신굴복인기결구실은전화위토체강도불족도치결구파배。
Considering cyclic-softening effect of soft soil foundation, cyclic strength of soft soil was embedded in the framework of the general finite element software ABAQUS by secondary development. Then, taking into account the pseudo-static analysis, it has been formulated a calculation model about the structural stability of the inverse T-type breakwater with jackets and pile foundations. Cyclic bearing capacities of the structures under action of wave load have been analyzed with the finite element method, and the influence of cyclic-softening effect of soft soil foundation on structural failure mode as well as the influence of structure size parameters on cyclic bearing capacity has been discussed. The results show that the cyclic bearing capacity of the inverse T-type breakwater with jackets and pile foundations is clearly lower than the ultimate bearing capacity without considering cyclic-softening effect of soft soil, and the rate of reduction is between 28. 72% and 41. 20% for the structure model. In consideration of the cyclic softening effect of soft soil, the failure mode of the structure may change from structure displacement for piles body yielding to structural failure caused by soil strength insufficient.
