考虑井阻时效的非线性单井地基径向固结解答  

Radical consolidation solution of non-linear single sand-drained foundation considering well resistance changing with time

作　　者：夏高翔 周峰 刘加才[1] 

机构地区：[1]南京工业大学岩土工程研究所,江苏南京210009 [2]无锡民用设计研究院,江苏无锡214061

出　　处：《南京工业大学学报（自然科学版）》2016年第4期105-113,共9页Journal of Nanjing Tech University(Natural Science Edition)

摘　　要：对塑料排水板通水量展开了有土模型试验,提出了与实际较契合的通水量双曲线衰减模型,并考虑土体的非线性固结特性、影响区内土体水平向渗透系数沿径向分别呈线性分布和抛物线分布,建立了瞬时加载条件下的单井地基固结方程且给出了更趋于实际的固结解答。总结了井阻时效对非线性单井地基固结过程的影响规律。结果表明:塑料排水板通水量在固结前期衰减明显,后期衰减趋缓,改进解较实际地反映了不同时间、不同深度下径向平均固结度U_r和径向平均超静孔压u_r,以往解其固结效率被高估。An experiment about the discharge capacity of PVD was carried out. An attenuation model of the hyperbola coincident with the actual fact was put forward. Considering the nonlinear consolidation characteristics and the horizontal permeability coefficient of the foundation in Affected zone as linear and parabola distribution,a mathematical equation of single sand-drained foundation under the condition that Instantaneous loading was set up. Given a analytical solution,the rule about the consolidation degree influenced by the well resistance changing with time was summarized. Results showed that the discharge capacity of PVD decayed quickly in the preliminary consolidation process and slowly in the upper consolidation process,the improved solution could reflect the radial average consolidation degree U_r and the excess pore water pressure u_r,the past solution was overestimated on the consolidation efficiency.

关 键 词：井阻时效 单井地基 固结度 通水量 非线性 

分 类 号：TU4[建筑科学—土工工程]