土体小应变硬化模型的深基坑变形特性数值分析
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摘要
针对常州青枫公园地铁车站深基坑工程,研究了深基坑开挖对围护结构和周围土体变形的影响,并对比了数值模拟和现场监测结果。研究表明:数值模拟结果的规律性符合现场实际和工程经验;相比于采用莫尔库伦模型计算结果,数值模拟采用小应变硬化土模型的计算结果与现场监测值更为接近,也更为合理,因此利用硬化土小应变模型预测深基坑开挖对围护结构及周围环境的变形是可行的。
Aiming at the deep foundation pit project of Changzhou Qingfeng Park Metro Station, the influence of deep foundation pit excavation on retaining structure and surrounding soil deformation was studied, and the numerical simulation and field monitoring results were compared. The results show that the regularity of the numerical simulation results is in line with the field practice and engineering experience; compared with the results calculated by the MohrCoulomb model, the results calculated by the small strain hardened soil model are closer and more reasonable to the field monitoring values. Therefore, it is feasible to predict the deformation of the retaining structure and surrounding environment of deep foundation pit excavation by using the small strain model of hardened soil.
Aiming at the deep foundation pit project of Changzhou Qingfeng Park Metro Station, the influence of deep foundation pit excavation on retaining structure and surrounding soil deformation was studied, and the numerical simulation and field monitoring results were compared. The results show that the regularity of the numerical simulation results is in line with the field practice and engineering experience; compared with the results calculated by the MohrCoulomb model, the results calculated by the small strain hardened soil model are closer and more reasonable to the field monitoring values. Therefore, it is feasible to predict the deformation of the retaining structure and surrounding environment of deep foundation pit excavation by using the small strain model of hardened soil.
引文
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[2]建筑基坑支护技术规程:JGJ 120—2012[S].北京:中国建筑工业出版社,2012.
[3]赵国强.宁波深厚淤泥地层地铁深基坑变形特征与控制研究[D].长春:吉林大学,2012.
[4]徐中华,王卫东.敏感环境下基坑数值分析中土体本构模型的选择[J].岩土力学,2010,31(1):258.
[5]贾堤,石峰,郑刚,等.深基坑工程数值模拟土体弹性模量取值的探讨[J].岩土工程学报,2008,30(增刊1).155-158.
[6]白成生.佛山东平广场坑边逆作深基坑变形数值分析[J].岩土工程学报,2012,34(增刊1):139-154.
[7]刘畅.考虑土体不同强度与变形参数及基坑支护空间影响的基坑支护变形与内力研究[D].天津:天津大学,2008.
[8]王卫东,王浩然,徐中华.基坑开挖数值分析中土体硬化模型参数的试验研究[J].岩土力学,2012,33(8):2283.