摘要
由于计算方法不合理,岩土参数取用不准确,地基沉降的理论计算和数值分析结果往往与实际情况存在较大差异。在掌握大量沉降观测数据的基础上,运用曲线拟合推算方法来预测沉降发展趋势和最终沉降量相对切合实际,具有一定优势。这些推算方法多不需要室内试验资料,推算过程简便,易于被工程技术人员接受。考虑到海积软土地基沉降曲线在主、次固结阶段的不同特征和次固结沉降的有限性,本文对Buisuman公式的次固结计算模型进行了改进,提出了一个针对次固结阶段沉降的推算新方法,并通过工程实例对该方法的可行性和合理性进行了验证。实例证明,所提出的次固结沉降推算方法简便实用,参数较易于获取,具有很好的推广应用价值。
Because of unreasonable calculation methods and inexactness of soil parameters chosen,the ground settlement calculation results from both theoretical and numerical analysis are quite inaccurate with comparison to the actual situations.Based on the sufficient settlement observational data obtained,it is more practical and advantageous to forecast the developing trend and final values of ground settlement by using curve fitting methods.Those forecasting methods are easier to be accepted by engineers for mainly not requiring laboratory testing data and its simple calculating process.The calculation model of Buisuman＇ s secondary consolidation formula is revised with considering the different characteristics of the foundation settlement curves of soft marine clay during primary and secondary consolidating stage and the limitation of secondary consolidation.A new settlement forecasting method for secondary consolidating stage is put forward,and the feasibility and rationality of the method is substantiated through the actual project example.The suggested settlement forecasting method of secondary consolidation is simple and convenient,which has the easier way to get the calculation parameters needed,and possesses better popularization and application value.
出处
《工程勘察》
2013年第1期14-19,共6页
Geotechnical Investigation & Surveying
关键词
海积软土
沉降预测
次固结
曲线拟合
marine clay
settlement forecasting
secondary consolidation
curve fitting
