基于双曲线拟合法的超载预压卸荷沉降速率标准研究  

Research on Settlement Rate Standard for Determining Surcharge Removal Time Based on Hyperbolic Fitting Method

作　　者：杨涛[1] 张文彦[1] 李国维[2] 韩东晓[1] 

机构地区：[1]上海理工大学土木工程系,上海200093 [2]河海大学岩土工程研究所,江苏南京210098

出　　处：《中国公路学报》2010年第3期10-14,28,共6页China Journal of Highway and Transport

基　　金：广东省交通厅科技项目(200502)

摘　　要：基于双曲线拟合法,推导出恒载下地基沉降速率与剩余沉降之间的关系式、剩余沉降与工后沉降之间的关系式,据此建立了超载预压卸荷沉降速率标准的计算公式,并给出公式中相关参数的确定方法,最后对一个工程实例进行了分析。结果表明:沉降速率标准不仅取决于允许的工后沉降,还与土体固结性质、路面设计使用年限和超载量引起的地基最终沉降有关;超载预压时按该建议的沉降速率标准卸荷,控制的工后沉降非常接近允许值,证明了该沉降速率标准公式的正确性。Based on hyperbolic fitting method,two equations about the relation between the settlement rate and the residual settlement and relation between the residual settlement and the post-construction settlement were deduced under constant load.The calculated equation of settlement rate standard for determining surcharge removal time was proposed,and the fitting method of determing the parameters in the standard was presented.Results show that the settlement rate standard depends on not only allowed post-construction settlement,but also consolidation rate of soil,design working life of pavement and final settlement due to surcharge itself.The proposed settlement rate standard is applied to surcharge removal.The controlled post-construction settlements recommended by the settlement rate standard are very close to the allowed values.It verifies the correctness of the proposed settlement rate standard equation.

关 键 词：道路工程 沉降速率标准 双曲线拟合法 超载卸荷时间 工后沉降 

分 类 号：U416.12[交通运输工程—道路与铁道工程]