循环荷载作用下饱和土体的固结沉降探析  

Consolidation settlement analysis of saturated soil under cyclic loading

作　　者：陈敏[1] 黄明[2] 

机构地区：[1]福州大学经济管理学院,福州350116 [2]福州大学土木工程学院,福州350116

出　　处：《有色金属（矿山部分）》2018年第1期55-58,63,共5页NONFERROUS METALS(Mining Section）

基　　金：福建省自然科学基金项目(2012J05090)

摘　　要：交通荷载作用下滨海高水位饱和土层的沉降一直是长期关注的热点。基于轴对称Biot固结理论,针对循环荷载作用下轴对称饱和弹性地基的平面固结特性进行了分析。通过引入正弦波动荷载,计算得到轴对称饱和弹性地基的状态方程组,并采用Cayley-Hamilton数学方法以及Laplace变换和Hankel变换,对动荷载作用下饱和弹性土体的地表沉降和超孔隙水压力变化进行了求解。在此基础上,通过编制相应的求解程序并结合工程算例,对不同参数变化对地表沉降量和超孔隙水压力的影响规律进行了系统分析,结果表明,随着与荷载距离的增大,动荷载引起的地表沉降逐渐减小,相邻计算点的差异沉降及影响范围随着弹性模量的增大而减小,随渗透系数的增大而增大。研究结论可为滨海城市地铁工程的建设提供理论依据。The settlement of the high water level saturated soil layer under traffic load has been a hot topic of long-term concern in the coastal region.For the purpose,based on axisymmetric Biot＇s consolidation theory,the plane consolidation properties of the axisymmetric saturated elastic foundation under cyclic load need to be discussed.The state equations of the axisymmetric saturated elastic foundation is derived by introducing sine wave load.Considering the action of the dynamic load,the surface settlement and the change of excess pore water pressure of saturated elastic soil are obtained by using the Cayley-Hamilton method,Laplace Transformation and Hankel Transformation.On this basis,by providing the relevant computer program and combining with the engineering example,and the influence of different parameters on the surface settlement and pore water pressure are systematically analyzed.It shows that,surface settlement caused by dynamic load decreases with the increase of distance of the position from load.Both the differential settlement among the adjacent points and the influence scope decrease with the increase of elastic modulus,however,they increase with the increase of the permeability coefficient.The research conclusions can provide theoretical basis for the design and construction of the subway in coastal city.

关 键 词：循环荷载 弹性地基 BIOT固结理论 超孔隙水压力 沉降 

分 类 号：TD853.399[矿业工程—金属矿开采]