地铁车站深基坑开挖对围护结构和周围环境的影响分析

针对常州北站深基坑工程,开展了数值模拟和现场监测工作,研究了深基坑开挖对围护结构和周围环境的影响。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,数值模拟采用硬化土小应变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;数值模拟结果还表明对管线变形影响最大的因素是管线距基坑的距离,而管线埋深和材质因素影响较小。

Aiming at the deep foundation pit of Changzhou North Railway Station, numerical simulation and field monitoring were carried out to study the influence of deep foundation pit excavation on the retaining structure and surrounding environment. The results show that the regularity of numerical simulation results conforms to the field practice and engineering experience;compared with the results of Mohr-Coulomb model, the results of numerical simulation using the small strain model of hardened soil are more close to the field monitoring values and more reasonable, so the small strain model of soil is used to predict the enclosure of deep foundation pit excavation. The numerical simulation also shows that the distance between the pipeline and the foundation pit is the most important factor affecting the deformation of the pipeline, while the depth of the pipeline and the material factor have little influence.