多级线性加载作用下软基超静孔压变化规律  

Variation law of excess pore pressure of soft foundation under multi-stage linear loading

作　　者：杜明芳[1] 李俊昊 郑旭阳 陆玲玲 DU Mingfang;LI Junhao;ZHENG Xuyang;LU Lingling(College of Civil Engineering and Architecture,Henan University of Technology,Zhengzhou450001,China)

机构地区：[1]河南工业大学土木建筑学院,郑州450001

出　　处：《中国科技论文》2022年第8期851-856,共6页China Sciencepaper

摘　　要：为明确多级加载作用下的软基固结变形规律,基于太沙基固结理论求解了多级线性加载、任意加载速率下的固结解析解。结果表明:多级线性加载下超静孔压处于波动状态;加载级数的准确拟合是了解多级加载下超静孔压真实变化的前提;超静孔压极值及变化路径受加载速率影响最大、分级加载间隔期影响次之,加载级数影响最弱;多级加载间隔期最优、最佳加载时间分别对应超静孔压消散60%、80%时。最后结合工程实例对软基多级线性加载下超静孔压及沉降变化规律进行对比分析,发现一级线性固结解在解决多级线性加载问题时具有不适用性;基于实际荷载加载级数得到的超静孔压、沉降理论值及变化规律与实测值有较好的吻合性。In order to clarify the consolidation deformation law of soft foundation under multi-stage loading,the analytical solution of consolidation under multi-stage linear loading and arbitrary loading rate was solved based on Terzaghi’s consolidation theory.The results show that the excess pore pressure fluctuates under multi-stage linear loading.Accurate fitting of loading order is the premise of understanding the real change of excess pore pressure under multi-stage loading.The maximum value and path of ex-cess pore pressure are most affected by the loading rate.The interval between loading stages is the second,and the loading order is the last one.The optimal multi-stage loading interval and loading time correspond to 60%and 80%dissipation of excess pore pressure,respectively.Finally,the variation law of excess pore pressure and settlement under multi-stage linear loading of soft foundation was compared and analyzed with engineering examples.It is found that the first-stage linear consolidation solution is not applicable to solve the multi-stage linear loading problem.The theoretical values and variation rules of excess pore pressure and settlement obtained based on the actual loading order are in good agreement with the measured values.

关 键 词：岩土工程 多级 线性加载 固结理论 超静孔压 

分 类 号：TU411.99[建筑科学—岩土工程]