抛填饱和软粘土围堰模型试验相似材料研究  

Study on Similar Materials for Model Test of Dumped Saturated Soft Clay Cofferdam

作　　者：章立辰 黄北圪 黄勇 祝俊华 罗伟[2,3] 朱碧堂 Zhang Lichen;Huang Beige;Huang Yong;Zhu Junhua;Luo Wei;Zhu Bitang(Port and Waterway Construction Investment Group Shihutang Navigation and Power Hub Branch of Jiangxi Province,Nanchang 330008,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;Engineering Research and Development Centre for Underground Technology of Jiangxi Province,East China Jiaotong University,Nanchang 330013,China;Road and Port Engineering Co.,Ltd.of Jiangxi Province,Nanchang 330299,China)

机构地区：[1]江西省港航建设投资集团石虎塘航电枢纽分公司,江西南昌330008 [2]华东交通大学土木建筑学院,江西南昌330013 [3]华东交通大学江西省地下空间技术开发工程研究中心,江西南昌330013 [4]江西省路港工程有限公司,江西南昌330299

出　　处：《华东交通大学学报》2021年第6期20-28,共9页Journal of East China Jiaotong University

基　　金：江西省交通运输厅重点工程科技项目(2019C0010,2019C0011);江西省岩土工程基础设施安全与控制重点实验室资助项目(20161BCD40010)。

摘　　要：基于相似理论与正交试验,以江西信江双港航电枢纽工程上下游围堰工程为背景,借鉴盾构隧道中渣土改良试验,根据泡沫能够有效降低相似材料的粘聚力和内摩擦角的原理,以滑石粉、重晶石粉、粉细砂、钠基膨润土和泡沫为原材料,配制抛填饱和粉质粘土夹淤泥质土围堰模型试验相似材料。通过密度试验、十字板剪切试验与渗透试验,获得不同配比相似材料的密度、不排水抗剪强度和渗透系数等指标。试验结果表明:该材料的不排水抗剪强度较低,其余参数调节范围较广,能够满足大部分模型试验对土质相似材料的要求且特别适合用来模拟模型试验中水环境下的软弱土质,研究成果可为类似土质相似材料的配比提供参考。During the construction of Shuanggang navigation and power junction project along the Xinjiang River,the cofferdam filling has the characteristics of low strength and low permeability. Because of the large scale of the cofferdam on site, considering the size of the model slot, the similarity of this model test is large, and the shear strength index and permeability coefficient of the corresponding analogous materials are very low. Talc, barite powder, silty sand, sodium bentonite and foams were used as raw materials. Based on orthogonal test, analogous materials were prepared for model test of the cofferdam. The density, undrained shear strength and permeability coefficient of analogous materials with different ratios were obtained through density test, vane shear test and penetration test. The results show that the undrained shear strength of the material is low, and the other parameters are widely adjusted, which can meet the requirements of most model tests on analogous soil materials and is especially suitable for simulating soft soil under water environment in model tests. The outcome can provide reference for the selection of analogous materials in other model tests.

关 键 词：围堰 抛填 粉质粘土夹淤泥质土 相似材料 正交试验 

分 类 号：U414[交通运输工程—道路与铁道工程] TU411[建筑科学—岩土工程]