浅析基坑支护工程中土体抗剪强度的影响因素
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摘要
基坑支护虽是临时工程,但其贯穿基坑开挖及基础施工的整个过程,其安全与否不仅直接关系着基坑本身,还可能对周边临近的建筑物或管线等造成危害,甚至对人民生命财产安全构成威胁。因此,基坑支护工作不容小觑,而其首要工作是设计,所以,更要重视基坑支护设计。基坑支护设计中首要关注的是土体的抗剪强度,而影响土体抗剪强度的因素很多,结合具体工程实例,仅从地下水、冻融作用及土方开挖三个方面简单探讨其分别对土体抗剪强度的影响,同时,根据对具体实例的分析,简单总结了基坑支护设计中需注意的特殊情况及其应对措施,以期为今后相关的设计工作提供一定的参考建议。
Although the deep excavation support is a temporary project,the safety of the excavated area throughout the entire foundation excavation and construction is not only directly related to the excavation support itself,but also may result in the damage to adjacent buildings and/or utilities.Further,it might pose a threat to the loss of properties and even public and construction workers lives.Therefore,the importance of the deep excavation support design should be properly recognized by the designers as well as the owners.The shear strength is the most critical factor in the deep excavation support design.The three factors,such as,groundwater level,freeze-thaw effect and earth excavation sequence,that could impact the shear strength are evaluated in this paper based on a practical project.Typical issues that encountered in the foundation excavation and correspondent countermeasures are analyzed in the paper.
Although the deep excavation support is a temporary project,the safety of the excavated area throughout the entire foundation excavation and construction is not only directly related to the excavation support itself,but also may result in the damage to adjacent buildings and/or utilities.Further,it might pose a threat to the loss of properties and even public and construction workers lives.Therefore,the importance of the deep excavation support design should be properly recognized by the designers as well as the owners.The shear strength is the most critical factor in the deep excavation support design.The three factors,such as,groundwater level,freeze-thaw effect and earth excavation sequence,that could impact the shear strength are evaluated in this paper based on a practical project.Typical issues that encountered in the foundation excavation and correspondent countermeasures are analyzed in the paper.
引文
[1]建筑基坑支护技术规程(JGJ120-99)[S].北京:中国建筑工业出版社,2012(2).
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[6]齐吉琳,张建明,朱元林.冻融作用对土结构性影响的土力学意义[J].岩石力学与工程学报,2003,22(增2):2690-2694.
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[8]崔宏环,张立群.基坑开挖卸载过程中考虑应力路径的抗剪强度指标的确定[J].建筑科学,2011,27(5):41-45.
[2]李金玉,杨庆,孟长江.非饱和抗剪强度指标c,φ值与含水率ω的关系[J].岩土工程技术,2010,24(5):243-247.
[3]孙晓东,王丹.土的粘聚力取值分析[J].辽宁建材,2010(3):39-41.
[4]陈肖柏,刘建坤,刘鸿绪,等.土的冻结作用与地基[M].北京:科学出版社,2006:3-4.
[5]赵延凯,彭然,周加伟,等.季节性冻土深基坑支护研究[J].建筑结构,2011,41(7):119-122.
[6]齐吉琳,张建明,朱元林.冻融作用对土结构性影响的土力学意义[J].岩石力学与工程学报,2003,22(增2):2690-2694.
[7]王永忠,刘雄军,艾传井,等.南方短时冻土抗剪强度指标c、φ值的试验研究[J].武汉大学学报(工学版),2010,43(2):198-202.
[8]崔宏环,张立群.基坑开挖卸载过程中考虑应力路径的抗剪强度指标的确定[J].建筑科学,2011,27(5):41-45.