[1]张 飞,王 燕,李志远.邻近超载状态下软土深基坑变形时间特性研究[J].吉林建筑大学学报,2019,(05):5-11.
 ZHANG Fei,WANG Yan,LI Zhi-yuan.Study on time characteristics of soft soil deep foundation pit deformation under the condition of overload[J].Journal of Jilin Jianzhu University,2019,(05):5-11.
点击复制

邻近超载状态下软土深基坑变形时间特性研究(/HTML)
分享到:

《吉林建筑大学学报》[ISSN:2095-8919/CN:22-1413/TU]

卷:
期数:
2019年05期
页码:
5-11
栏目:
工程科技
出版日期:
2019-10-25

文章信息/Info

Title:
Study on time characteristics of soft soil deep foundation pit deformation under the condition of overload
文章编号:
2095-8919(2019)05-0005-07
作者:
张 飞王 燕李志远
福建江夏学院,福州 350108
Author(s):
ZHANG FeiWANG YanLI Zhi-yuan
ZHANG Fei,WANG Yan,LI Zhi-yuanFujian Jiangxia college,Fuzhou 350108,China
关键词:
超载软土深基坑数值模拟时间特性
Keywords:
overloadsoft soildeep foundation pitnumerical simulationtime characteristics
分类号:
U 442
文献标志码:
A
摘要:
邻近超载对软土深基坑变形影响显著,同时软土地区基坑工程施工具有明显的时间效应,而经典弹性及弹塑性模型无法反映这一点.通过建立考虑土体蠕变-固结耦合效应的有限元模型,对不同超载值引起的深基坑工程变形特性进行了分析,并与实测值对比验证.结果表明,超载作用会减少因开挖卸载而在周边土体中产生的负超静孔隙水压力,坑外土体主要表现为流变效应,土体固结效应几乎可忽略,而坑内土体则出现流变-固结耦合效应.超载作用对地下连续墙水平位移影响显著,超载值越大,地下连续墙水平位移越大.邻近基坑超载加大了墙后地表沉降最大值,超载作用使墙后地表沉降最大值作用位置更加靠近挡墙.
Abstract:
Adjacent overload has a significant effect on the deformation of deep foundation pits in soft soil areas.At the same time,the construction of foundation pits in soft soil areas has obvious time effects,while the classical elastic and elastoplastic models can not reflect this.By establishing a finite element model considering the creep-consolidation coupling effect of soil,the deformation characteristics of deep foundation pit caused by different overload sizes are analyzed and verified by comparison with measured data.The results show that the overloading will reduce the negative excess pore water pressure generated in the surrounding soil due to excavation and unloading.The soil outside the pit is mainly rheological,and the consolidation effect of the soil is almost negligible,while the soil in the pit shows the coupling effect of rheology and consolidation.The effect of overloading on the horizontal displacement of the underground continuous wall is significant.The larger the overload value,the larger the horizontal displacement of the underground continuous wall.The near-overload of the foundation pit increases the maximum settlement of the ground surface behind the wall.The overload action causes the maximum surface settlement of the wall behind the wall to be closer to the retaining wall.

参考文献/References:

[1] 谢秀栋,王燕.深基坑超挖施工围护结构变形分析[J].岩土工程技术,2011,25(6):300-303. [2] 郑素苹.排桩内支撑支护体系在软土深基坑中的应用与研究[J].三明学院学报,2017,34(2):83-88. [3] 王雪妮,韩国锋.地铁车站深基坑的变形预测及稳定性研究[J].长江科学院院报,2018,35(10):77-81+87. [4] 刘小丽,彭晶.邻近建筑物超载深度对土岩组合基坑开挖变形影响的研究[J].工业建筑, 2015,45(4):107-112+47 [5] 李志伟.邻近建筑物对软土地基深基坑变形的影响分析[J].地下空间与工程学报,2015,11(3):720-725. [6] 黄珏皓,陈健,柯文汇,黄祥国.基于时间效应理论的软土深基坑变形分析[J].长江科学院院报,2017,34(5):75-80. [7] 喻卫华.软土地区深基坑设计与施工技术探讨[J].建筑结构,2018,48(11):118-122. [8] 李夕林,魏祥,梁志荣.软土地区深基坑变形控制设计实践与分析[J].岩土工程学报,2014,36(S1):160-164. [9] 李玉岐,周健,谢康和.考虑渗流与变形耦合作用的基坑工程时间效应[J].水利学报,2006(6):694-698. [10] SighA,Mitchell,J.K.General stress-strain-time function for soils[J].Journal of Mechanics and Foundation Division,ASCE,1968,94(1):21-46. [11] Mesri G,Febres-Cordero E,Shields D,R,Castro A.Shea:Stress-strain-time behavior of clays[J].Geo technique,1981,31(4):537-552. [12] 郭海柱,张庆贺,郭健.时间硬化与Druker-Prager耦合蠕变模型的应用研究[J].结构工程师,2008(3):117-121.

备注/Memo

备注/Memo:
收稿日期:2019-09-10
基金项目:福建省自然科学基金项目(2018J01631); 福建省教育厅中青年教师科研项目(JT180571); 福建江夏学院青年科研人才培育基金项目(JXZ2017007).
作者简介:张 飞(1987~),男,河南省南阳市人,讲师,硕士.E-mail:597586597@qq.com.

更新日期/Last Update: 2019-10-25