大圆筒与旋喷桩组合式围堰结构稳定性有限元分析  

Finite element analysis on stability of large cylindrical cofferdam structure combined with jet grouting piles

作　　者：肖忠[1,2] 温洪涌 张文忠[2,4] 黄宣军[2,4] 王元战[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津市港口与海洋工程重点试验室,天津300072 [2]中国交建海岸工程水动力重点实验室,天津300222 [3]深圳中广核工程设计有限公司,广东深圳518124 [4]中交天津港湾工程研究院有限公司,天津300222

出　　处：《中国港湾建设》2014年第10期9-13,共5页China Harbour Engineering

基　　金：国家自然科学基金项目(51109157);天津市应用基础与前沿技术研究计划项目(12JCQNJC04900);高等学校博士学科点专项科研基金项目(20110032120049);大连理工大学海岸和近海工程国家重点实验室开放基金项目(LP1106)

摘　　要：通过三维弹塑性有限元计算得出在施工期围堰内外侧土压力和水压力差的共同作用下大圆筒结构的稳定性安全系数最小。大圆筒底部进行高压旋喷桩施工后,结构稳定性大幅提高。大圆筒围堰在内外侧土压力和水压力差的共同作用下,结构的变位模式主要为平动,并伴随一定的转动,转动点位于大圆筒筒底以下,筒壁与海侧土体间发生了分离现象,并且无旋喷桩时筒土分离的区域比较大。研究成果可为这种结构的设计和应用提供借鉴和参考。3D elastic-plastic finite element models were established for analysis of the structure stability. The results show that the stability safety factor of the large cylindrical structure have the minimum value under soil and water pressures difference inside and outside the cofferdam structure in construction period. When the jet grouting piles were constructed under the large cylindrical cofferdam structure, its stability increased sharply. In addition, it was obtained that the displacement mode of this structure under soil and water pressures difference in construction period was mostly translation with a certain rotation of some point under the bottom of large cylindrical structure. And separations were formed between cylinder wall and the seaside soil.Furthermore, separations become larger when there was no jet grouting piles. The present research can be a reference for the design and application of the structure.

关 键 词：大圆筒结构 人工岛 稳定性 旋喷桩 有限元法 

分 类 号：U656.6[交通运输工程—港口、海岸及近海工程]