复杂深基坑二次开挖支护结构设计与监测分析
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摘要
采用Midas GTS对二次开挖未加固的基坑开挖过程进行有限元模拟,通过对基坑破坏特征的深入分析,提出了基坑二次开挖的支护方案,并对不同方案模型做了数值模拟,结果表明桩前预留土台对基坑控制变形有较好的效果。考虑到土台自身变形较大、原桩施工质量及土台稳定性问题,最终选定土台前新增支护桩并采用连梁与原支护桩相连的方案;同时对基坑工程开挖进行了现场监测,并对监测数据进行了处理分析,结果表明支护桩及坡顶的变形在安全范围内,提出的加固方案科学可靠。
The Midas GTS was used to simulate the excavation of the foundation excavation without secondary excavation,and based on the deep analysis of the characteristics of foundation excavation failure,the support scheme of secondary excavation of foundation excavation was put forward,and the numerical simulation of different scheme models showed that the pre-pile soil table had good effect on the deformation control of foundation excavation. Taking the large deformation of the soil table into account,the construction quality of the original pile and the stability of the soil table,the final selection of the new support pile before the pile and the use of the beam and the original support pile connected to the program. At the same time,the site excavation of the foundation excavation was monitored and the monitoring data were analyzed. The results showed that the deformation of the supporting pile and the roof was within the safe range,and the proposed reinforcement scheme was scientific and reliable.
The Midas GTS was used to simulate the excavation of the foundation excavation without secondary excavation,and based on the deep analysis of the characteristics of foundation excavation failure,the support scheme of secondary excavation of foundation excavation was put forward,and the numerical simulation of different scheme models showed that the pre-pile soil table had good effect on the deformation control of foundation excavation. Taking the large deformation of the soil table into account,the construction quality of the original pile and the stability of the soil table,the final selection of the new support pile before the pile and the use of the beam and the original support pile connected to the program. At the same time,the site excavation of the foundation excavation was monitored and the monitoring data were analyzed. The results showed that the deformation of the supporting pile and the roof was within the safe range,and the proposed reinforcement scheme was scientific and reliable.
引文
[1]熊智彪,王启云.深基坑二次支护失稳与加固[J].安全与环境工程,2007,14(2):76-78.
[2]朱彦鹏,朱胜祥,叶帅华,等.某工程深基坑事故分析与二次加固设计[J].岩土工程学报,2014,36(S1):186-191.
[3]宫鹤,熊智彪,宋世豪,等.复杂周边环境深基坑支护设计及监测分析[J].地下空间与工程学报,2015,11(3):733-738.
[4]李贤军,张晓明,曾海柏.微型钢管桩在二次开挖厚层填土基坑中的应用[J].中国煤炭地质,2016,26(6):65-68.
[5]颜敬,方晓敏.支护结构前反压土计算方法回顾及一种新的简化分析方法[J].岩土力学,2014,35(1):167-174.
[6]中国建筑科学研究院.建筑基坑支护技术规程:JGJ120—2012[S].北京:中国建筑工业出版社,2012.
[7]济南大学,莱西市建筑总公司,山东省工程建设标准造价协会.建筑基坑工程监测技术规程:GB50497—2009[S].北京:中国建筑工业出版社,2009.
[2]朱彦鹏,朱胜祥,叶帅华,等.某工程深基坑事故分析与二次加固设计[J].岩土工程学报,2014,36(S1):186-191.
[3]宫鹤,熊智彪,宋世豪,等.复杂周边环境深基坑支护设计及监测分析[J].地下空间与工程学报,2015,11(3):733-738.
[4]李贤军,张晓明,曾海柏.微型钢管桩在二次开挖厚层填土基坑中的应用[J].中国煤炭地质,2016,26(6):65-68.
[5]颜敬,方晓敏.支护结构前反压土计算方法回顾及一种新的简化分析方法[J].岩土力学,2014,35(1):167-174.
[6]中国建筑科学研究院.建筑基坑支护技术规程:JGJ120—2012[S].北京:中国建筑工业出版社,2012.
[7]济南大学,莱西市建筑总公司,山东省工程建设标准造价协会.建筑基坑工程监测技术规程:GB50497—2009[S].北京:中国建筑工业出版社,2009.