考虑稻秸秆束加筋效应的地基承载力研究  

Study on bearing capacity of foundation considering the effect of straw stalk rope reinforcement

作　　者：冯旭松 徐桂中[3] 吉锋 张丹[3] 丁宇轩 FENG Xusong;XU Guizhong;JI Feng;ZHANG Dan;DING Yuxuan(Jiangsu Water Resources Co.,Ltd.,East Route of South to NorthWater Transfer Project,Nanjing 210029,China;Jiangsu Pump Station Engineering Technology Research Center,Nanjing 210029,China;School of Civil Engineering,Yancheng Institute of Technology,Yancheng 224051,China)

机构地区：[1]南水北调东线江苏水源有限责任公司,江苏南京210029 [2]江苏省泵站工程技术研究中心,江苏南京210029 [3]盐城工学院土木工程学院,江苏盐城224051

出　　处：《四川建筑科学研究》2020年第1期57-64,共8页Sichuan Building Science

基　　金：住房和城乡建设部科研项目(2018-K7-011);江苏省水利厅科技项目(2018012)

摘　　要：农作物秸秆是一种可再生资源,常常作为排水体及加筋体加固吹填地基。为了探讨稻秸秆束对吹填地基的加筋效应,本文开展了稻秸秆束的拉伸、拉拔试验,推导了考虑稻秸秆束加筋效应的地基承载力计算公式,分析了稻秸秆束的打设间距、打设深度等5个因素对地基承载力的影响。结果表明:稻秸秆束的拉伸力随拉伸位移的增加而增加;稻秸秆束与疏浚淤泥的界面抗剪强度曲线符合M-C准则;减小打设间距或增加基础宽度,在保证足够的嵌固长度时,地基承载力会提高;增加打设深度、界面摩擦强度以及稻秸秆束抗拉强度可以提高地基承载力,但地基承载力存在上限值。Crop straw is a renewable resource that is often used as a drainage body and a reinforcement to reinforce the foundation.In order to investigate the reinforcement effect of rice straw rope on the dredger foundation,the tensile and pull-out tests of rice straw rope were carried out,and the calculation formula of foundation bearing capacity considering the reinforcement effect of rice straw rope was derived,and the calculation formula of foundation bearing capacity considering the reinforcement effect of rice straw rope was deduced.The influences of five factors such as the spacing and depth of the straw straw rope on the bearing capacity of the foundation were analyzed.The results show that the tensile strength of straw stalk rope increases with the increase of tensile displacement;the interface shear strength curve of straw stalk rope and dredged sludge meets the M-C criterion;reduce the spacing of the installation or increase the foundation width,the ground bearing capacity will be improved when sufficient embedded length is ensured;increasing the depth of the installation,the interface friction strength and the tensile strength of the straw rope can increase the bearing capacity of the foundation,but the upper limit of the foundation bearing capacity exists.

关 键 词：稻秸秆束 筋土界面摩擦特性 地基承载力 

分 类 号：TU431[建筑科学—岩土工程]