基床系数静载试验取值方法与应用
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摘要
对具有完整加载段、不完整、不规则或缺乏明确临塑荷载的静载试验非线性p-s曲线,提出了估算其地基土层基床系数的方法。通过对非洲大陆4个工程项目静载试验的实例分析,说明对粉细砂土、碎石土层,曲线拟合估算的基床系数比静载试验测试点直接计算的数值低,比现有文献的参考数值高。基床系数对基础结构性状分析存在较大影响,利用静载试验方法估算基床系数对实际工程十分重要。
This paper puts forward the methods of calculating modulus of subgrade reaction,based on static loading test which contains full load segments,incomplete,irregular,or lack of clear ultimate load curves.According to static load tests instance in 4 project testing in African continent,the modulus of subgrade reaction on silty sand soil,gravelly soil,testing result based on static loading test is higher than curve fitting,and lower than existing literature.The modulus of subgrade reaction has bigger influence on infrastructure character analysis,get modulus of subgrade reaction from static loading test was important in the actual projects.
This paper puts forward the methods of calculating modulus of subgrade reaction,based on static loading test which contains full load segments,incomplete,irregular,or lack of clear ultimate load curves.According to static load tests instance in 4 project testing in African continent,the modulus of subgrade reaction on silty sand soil,gravelly soil,testing result based on static loading test is higher than curve fitting,and lower than existing literature.The modulus of subgrade reaction has bigger influence on infrastructure character analysis,get modulus of subgrade reaction from static loading test was important in the actual projects.
引文
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[2]GB 50021—2001岩土工程勘察规范(2009年版)[S].北京:中国建筑工业出版社,2009.
[3]周景星,李广信,虞石民,等.基础工程[M].北京:清华大学出版社,2007.
[4]MH/T5025—2011民用机场勘测规范[S].北京:中国民用航空局,2011.
[5]MH/T5004—2011民用机场水泥混凝土道面设计规范[S].北京:中国民用航空局,2009.
[6]Joseph.E.Bowles.FOUNDATION ANALYSIS AND DESIGN(Fifth Edition)[M].The McGraw-Hill Companies,Inc.1997.
[7]刘建航,侯学渊.基坑工程手册[M].北京:中国建筑工业出版社,1997.
[8]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.
[9]高大钊.实用土力学[M].北京:人民交通出版社股份有限公司,2014.
[10]《工程地质手册》编委会.工程地质手册(第四版)[M].北京:中国建筑工业出版社,2007.
[11]JGJ 72—2004高层建筑岩土工程勘察规程[S].北京:中国建筑工业出版社,2004.
[12]周宏磊,张在明.基床系数的试验与取值[J].工程勘察,2004(2):11-14.