塑料排水板外土体淤堵的试验与固结计算方法研究  

Test and Consolidation Calculation Method of Soil Clogging Outside Prefabricated Vertical Drain

作　　者：苏若宾 陈庚[1,2] 林民国 孙贝贝[1,2] SU Ruo-bin;CHEN Geng;LIN Min-guo;SUN Bei-bei(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;Suzhou Research Institute,Hohai University,Suzhou 215004,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学苏州研究院,苏州215004

出　　处：《科学技术与工程》2023年第12期5210-5216,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51708176);江苏省研究生科研与实践创新计划项目(KYCX22_0620);苏州市科技计划项目(2022SS57)。

摘　　要：塑料排水板(prefabricated vertical drain,PVD)处理深厚软基的固结计算是工程设计中的关键问题。为改进现有固结理论未能考虑长期排水固结过程中滤膜周围附土淤堵作用的不足,通过室内模型试验得到了塑料排水板长期固结过程中淤堵区渗透系数的自然对数与时间的线性关系,并在此基础之上推导了考虑密切影响区及普通影响区渗透系数随时间变化的等应变固结解。最后基于现场实测的固结度数据,对比了传统计算方法和改进方法的计算结果,发现改进方法的计算值的精度在固结后期比传统方法高了11.16%,论证了改进方法的有效性。Effective calculation and analysis of the consolidation are key issues considered in the design of prefabricated vertical drain(PVD)-improved grounds.Current theories of long-term drainage consolidation of foundations treated with prefabricated vertical drains fail to consider the clogging effect of the soil around the PVD filters.To improve the current consolidation theory,a laboratory model test was used to obtain the linear relationship between the natural logarithm of the permeability coefficient and time.Based on this,an improved consolidation solution was derived considering the changing of the permeability coefficient in the zone of close and ordinary influence with time.Compared to the improved calculation method with the traditional one by the measured consolidation data from the field tests,the accuracy of the calculated values of the improved method is 11.16%better than the conventional method in the later stages,demonstrating the effectiveness of improved method.

关 键 词：深厚软基 塑料排水板(PVD) 长期排水固结 室内模型试验 淤堵作用 

分 类 号：TU472.6[建筑科学—结构工程]