聚苯乙烯泡沫材料与不同土体间的接触面剪切特性  

Interface Shear Characteristics between EPS and Different Soils

作　　者：刘鑫喜 高洪梅 徐琪尔 梁波 樊宝云 黄舒淇 卢广 Liu Xinxi;Gao Hongmei;Xu Qier;Liang Bo;Fan Baoyun;Huang Shuqi;Lu Guang(School of Transportation Engineering,Nanjing Tech University Nanjing 211816,China)

机构地区：[1]南京工业大学交通运输工程学院,南京211816

出　　处：《广东土木与建筑》2020年第7期107-111,共5页Guangdong Architecture Civil Engineering

基　　金：国家自然科学基金(51578286);江苏省大学生创新创业训练计划项目(201910291160Y)。

摘　　要：聚苯乙烯泡沫(expanded polystyrene,EPS)颗粒轻质混合土作为一种新型轻质填土材料,在软土地基处理中发挥了重要现E作P用S材。料通-过砂常土规接直触剪面试相验比,探EP究S了材E料P-S黏材土料(接包触括面颗,前粒者和粘板聚)分力别小与而黏摩土擦、角砂大土;以随及着不水同泥配含比量的增水加泥,E土PS之板间-接水触泥面土的接剪触切面特的性粘,发聚力析E和P摩S板擦分角别均与增黏大土,而、砂EP土S颗以粒及-不水同泥配土比接水触泥面土粘之聚间力的较抗小剪,摩糙擦度角变随化水,发泥现含各量接的触增面加对先E减PS小板而的后抗增剪大糙。度引均入大"于抗1剪,糙说度明"E概PS念板,分与参考与依据。Expanded polystyrene(hereafter EPS)bead light-weight mixed soil,as a new kind of light filling material,plays an important role in soft soil foundation treatment.In this paper,through conventional direct shear test,the shear characteristics of the contact surfaces between EPS material(including EPS beads and plates)and different soils(including clay,sand and cemented soil with different proportions)were investigated.It is found that the interface between EPS material and sand has a smaller cohesive and a larger friction angle compared to the interface between EPS material and clay.With the increase of cement content,the cohesion and friction angle of the interface between EPS plate and cemented soil were increased.However,the cohesion of the interface between EPS particle and cemented soil was relatively smaller,and its friction angle first reduced and then increased with the increase of cement content.The concept of shear-resistant roughness was introduced to discuss its variation with regard to the interface between EPS plate and clay,sand or cemented soil.It is found that the friction angles of all contact surfaces compared to EPS plate were greater than 1,which indicates that when the shear occurs along the interface between EPS plate and clay,sand or cement soil,the EPS plate is the first one to be damaged.This study provides a reference and basis for the further study on the internal mechanism of the shear strength of EPS bead light-weight mixed soil.

关 键 词：EPS材料 接触面剪切特性 直剪试验 抗剪糙度 

分 类 号：TU431[建筑科学—岩土工程]