随着城市化进程中对老城区的综合改造,出现越来越多复杂环境条件下的深基坑工程。单一支护形式在处理复杂环境下的深基坑工程很难同时满足使用要求和经济效益,复合支护形式成为解决这一难题的有效手段。针对郑州地区基坑工程中遇到的既有电力隧道、防空洞以及旧桩基复杂环境下,通过对工程所处地理环境、工程地质条件、基坑工程施工条件、周边建筑安全等方面的综合分析,采用桩锚/土钉复合支护结构方案进行处理。工程监测结果表明所采用方案能较好地解决基坑工程遇到既有电力隧道、防空洞以及旧桩基时的复杂环境条件下基坑支护的问题。
Abstract
An increasing number of deep foundation pit project in complex conditions has emerged with the comprehensive transformation of old urban area in the process of urbanization. Deep foundation pit projects with single sup-port could not easily meet the requirements of usage and economic benefit simultaneously, which, however, can be effectively addressed by composite support. In this research, a foundation pit project encountering existing power tunnel, air-raid shelter and old pile foundation in Zhengzhou city was taken as a case study of composite support form. Through analysis on geographical environment, engineering geological conditions, construction condition, and construction safety, a composite support plan integrating pile anchor and soil nailing structure is adopted. Monitoring results show that the composite support plan could well solve the problems posed by complex environment.
关键词
桩锚 /
土钉墙 /
复杂环境 /
复合支护 /
监测分析
Key words
pile-anchor /
soil-nailing /
complex environment /
composite support /
monitoring and analysis
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] JGJ 120—2012,建筑基坑支护技术规程[S].北京:中国建筑工业出版社,2012.
[2] 王文忠.复杂条件下基坑支护设计研究[J].吉林建筑工程学院学报,2012,29(3):9-12,44.
[3] 陈一也,张立丰,史 健.土钉墙与桩锚联合支护在某基坑中的应用[J].山西建筑,2010,36(12):80-81.
[4] 胡 瑞,颜海春.复合土钉与桩锚联合支护的应用研究[J].建筑施工,2005,27(6):29-32.
[5] 杨 帆.深基坑开挖条件下桩锚支护结构工程性状研究[D]. 长沙:长沙理工大学,2012.
[6] 陈帅强.桩锚支护结构受力特性研究[D]. 兰州:兰州理工大学,2014.
[7] 黄 睿.深基坑开挖中桩锚支护研究[J].黑龙江交通科技,2010,33(4):88-89.
[8] 许厚材.复杂条件下某深基坑工程联合支护技术[J].施工技术,2013,42(7):45-48.
[9] POH T Y, WONG I H, CHANDRASEKARAN B. Performance of Two Propped Diaphragm Walls in Stiff Residual Soils[J]. Journal of Performance of Constructed Facilities, 1997,11 (4): 190-199.
[10]LONG M. Database for Retaining Wall and Ground Movements due to Deep Excavations[J].Journal of Geotechnical and Geoenvironmental Engineering,2001,127(3):203-224.
[11]WONG K S, BORMS B B. Lateral Wall Deflections of Braced Excavations in Clay[J].Journal Geotechnical Engineering, 1989, 115(6): 853-870.
[12]郭院成,宋建学,周同和.桩锚与复合土钉联合支护结构的工程设计[J].建筑施工,2001,23(6):375-377.
[13]郑云刚,王自中,杨世相,等.城市复杂条件下超深基坑支护技术的研究与应用[J].施工技术,2014,43(1):73-77.
[14]杨海亭.周边复杂环境条件下的基坑支护设计[J].山西建筑, 2010,36(3):125-126.
[15]易丽丽,聂 俊,潘 泓.土钉墙在工程应用中的问题及改进方法的探讨[J].长江科学院院报,2012, 29(5):57-61.
[16]郭院成.基坑支护[M].郑州:黄河水利出版社,2012.
PDF(7322 KB)
