超软地基排水板弯折特性与抗弯折结构  

Bending characteristics and anti-bending structure of drainage plate in super soft foundation

作　　者：王海鹏[1] 徐杨 唐彤芝[1] 吴月龙[1] WANG Haipeng;XU Yang;TANG Tongzhi;WU Yuelong(Geotechnical Engineering Department,Nanjing Hydraulic Research Institute,Nanjing 210024,China)

机构地区：[1]南京水利科学研究院岩土工程研究所,江苏南京210024

出　　处：《河海大学学报（自然科学版）》2022年第6期130-137,共8页Journal of Hohai University(Natural Sciences)

基　　金：水利部公益性行业科研专项(201201015);中央级公益性科研院所基本科研业务费专项(Y314012)。

摘　　要：采用理论计算与模型试验对超软地基中排水板的弯折特性及其影响进行了研究,基于废弃料的利用提出了一种新型肋板结构,并对其抗弯折能力进行了理论分析和现场试验研究。结果表明,排水板产生弯曲变形的欧拉临界力P很小,Z型弯折的通水量明显小于S型弯折;弯折率由10%增加到20%、由20%增加到30%,板芯真空度降低幅度分别为3~8 kPa和34~46 kPa,弯折率对真空度和超静孔隙水压力的影响是非线性的,弯折率达到30%时影响程度明显加剧;新型肋板结构的截面抗弯刚度是普通板的8倍,板体抗弯刚度可提高数倍以上;加固后吹填土十字板强度达到16~23 kPa,地基承载力特征值达到60~63 kPa,开挖显示板体基本呈直立状。肋板型排水板对于增强排水板抗弯折能力、改善排水固结功效具有一定的作用。The bending characteristics of drainage plate in super soft foundation and its influence are studied by the theoretical calculation and the model test. Based on the utilization of waste materials, a new type of ribbed structure is proposed, and its bending resistance is theoretically and experimentally analyzed. The results show that the Pof Euler critical force is very small, and the water flow of Z bend is obviously smaller than that of S bend. When the bending rate increases from 10% to 20%, the vacuum degree of drainage plate core will decrease by 3 to 8 kPa, while the vacuum degree of drainage plate core will decrease by 34 to 46 kPa when the bending rate increases from 20% to 30%. The influence of bending rate on the vacuum degree of plate core and the excess pore pressure of soil is nonlinear. The influence degree is obviously intensified when the bending rate reaches 30%. Based on the idea of waste utilization, the ribbed plate structure is proposed, and the section bending stiffness of ribbed plate structure is 8 times that of the common plate, and the bending resistance of plate body could be increased several times. After reinforcement, the cross-plate strength of dredger fill reaches 16-23 kPa, and the characteristic value of the bearing capacity of mud surface foundation reaches 60-63 kPa, with basically erect plate body after excavation. The ribbed drainage board plays a certain role in enhancing the bending resistance of drainage plate and improving the drainage consolidation effect.

关 键 词：超软地基 排水板 肋板结构 弯折 真空预压 

分 类 号：TU122[建筑科学—建筑理论]