不同温度环境下加肋土工膜与砂土界面拉拔试验的颗粒流数值模拟

doi:10.12066/j.issn.1007-2861.2128

摘要/Abstract

摘要：

为了研究垃圾填埋场衬垫系统中加肋土工膜与砂土界面特性, 通过对比室内拉拔试验, 运用离散单元法的二维颗粒流程序(2D particle flow code, PFC$^{\rm 2D})$, 模拟了不同加肋高度和温度组合下的加肋土工膜与砂土界面拉拔试验, 得到了加肋土工膜与砂土界面的宏观应力-应变曲线、细观颗粒间位移场和应力场的变化规律. 研究结果表明: 加肋土工膜与砂土界面的拉拔应力明显优于光面土工膜($h=0$ mm)与砂土界面; 界面极限拉拔应力随着加肋高度的增加而增大, 随着温度的升高而减小; 界面摩擦系数随着温度的升高而减小. 还从细观角度(颗粒位移和内部接触力)模拟研究了加肋土工膜与砂土界面拉拔试验. 研究结果表明: 加肋土工膜与砂土界面附近砂土颗粒的位移较大, 颗粒整体向左上方移动, 而肋块后部上方的砂土由于法向应力作用向下运动; 随着温度的升高或者加肋高度的减小, 加肋土工膜与砂土界面附近的颗粒位移变大, 稳定性变差; 拉拔模型内部左侧的接触力较大, 加肋土工膜附近的接触力也较大, 并向上下两边逐渐减小; 随着加肋高度的增加或者温度的降低, 加肋土工膜与砂土界面附近土体内部的接触力明显增大. 研究结果从宏观到细观较全面地描述了加肋土工膜与砂土界面拉拔试验的全过程.

关键词: 数值模拟, 加肋土工膜, 拉拔试验, 位移, 接触力

Abstract:

The features of a ribbed geomembrane and sandy soil interface in a landfill liner system were studied by comparing the results of an indoor experiment and a two-dimensional particle flow code (PFC$^{\rm 2D})$ simulation using the discrete element method. An interface drawing test of the ribbed geomembrane and sandy soil interface was conducted under different combinations of ribbed heights and temperatures. Then, the macroscopic stress-strain curves of the ribbed geomembrane and sandy soil interface, the changing rule of the displacement field of microscopic particles, and the stress field were investigated. The results showed that the tensile stress of the ribbed geomembrane and sandy soil interface was superior to that of the smooth geomembrane ($h =0$ mm) and sandy soil interface. The drawing stress limit of the interface increased with the increase in rib height, and decreased with the increase in temperature. In addition, the friction coefficient of the interface decreased with the increase in temperature. Simulation of the microscopic aspects (particle displacement and internal contact force) also corresponded with the results of the ribbed geomembrane and sandy soil interface drawing experiment. The soil particle displacement near the ribbed geomembrane and sandy soil interface was larger, and the overall particles moved to the top left. The sandy soil at the top after the rib had downward movement owing to the normal stress. With an increase in temperature or decrease in rib height, the displacement of sand particles near the ribbed geomembrane and sandy soil interface increased, and the interface stability between the ribbed geomembrane and sandy soil became negligible. The contact forces on the left side of the drawing model and near the ribbed geomembrane were larger, and gradually decreased to the upper and lower sides. With an increase in rib height or a decrease in temperature, the contact force around the interface between the ribbed geomembrane and sandy soil increased. The entire process of drawing the ribbed geomembrane and sandy soil interface from macroscopic to microscopic was described.

Key words: numerical simulation, ribbed geomembrane, drawing test, displacement, contact force

中图分类号:

TU411.6

高俊丽, 徐宏飞, 袁川, 曹威. 不同温度环境下加肋土工膜与砂土界面拉拔试验的颗粒流数值模拟[J]. 上海大学学报(自然科学版), 2021, 27(2): 336-346.

GAO Junli, XU Hongfei, YUAN Chuan, CAO Wei. Numerical simulation of particle flow during a drawing test of a ribbed geomembrane and sandy soil interface under different temperatures[J]. Journal of Shanghai University（Natural Science Edition）, 2021, 27(2): 336-346.

图/表 16

图1

图2

图3

表1

图4

表2

表3

图5

图6

表4

图7

图8

图9

图10

图11

图12

参考文献 12

[1]	Bely V, Sviridenok A, Petrokovets M. Friction and wear in polymer-based materials[J]. Tribology International, 1982,15(5):272.
[2]	Osswald T, Menges G. Material science of polymers for engineers[M]. 3rd Ed. Munich: Carl Hanser Verlag, 2012.
[3]	Irsyam M, Hryciw R D. Friction and passive resistance in soil reinforced by plane ribbed inclusions[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1991,41(4):485-498.
[4]	许四法, 王国才, 王哲. 温度和填埋高度引起的垃圾填埋场边坡部土工膜张拉力评价[J]. 岩土力学, 2010(10):3120-3124.
	Xu S F, Wang G C, Wang Z. Evaluation of tensile forces of geomembrane placed on waste landfill slope due to temperature variation and filling height[J]. Rock and Soil Mechanics, 2010(10):3120-3124.
[5]	景苏明. 土工格栅拉拔试验界面等效摩擦力研究[D]. 天津: 天津大学, 2014.
	Jing S M. Study on interaction equivalent friction of geogrid pullout test[D]. Tianjin: Tianjin University, 2014.
[6]	高俊丽, 张孟喜, 林永亮, 等. 加肋土工膜与砂性土界面相互作用机制分析[J]. 岩土力学, 2012,33(8):2465-2471.
	Gao J L, Zhang M X, Lin Y L, et al. Analysis of interaction mechanism of reinforced geomembrane and sandy soil interface[J]. Rock and Soil Mechanics, 2012,33(8):2465-2471.
[7]	高俊丽, 张孟喜, 张文杰. 加肋土工膜与砂土界面特性研究[J]. 岩土力学, 2011,32(11):3225-3230.
	Gao J L, Zhang M X, Zhang W J. Interface property between sand and reinforced geomembrane[J]. Rock and Soil Mechanics, 2011,32(11):3225-3230.
[8]	张孟喜, 张石磊. H-V 加筋土性状的颗粒流细观模拟[J]. 岩土工程学报, 2008(5):625-631.
	Zhang M X, Zhang S L. Behaviour of soil reinforced with H-V inclusions by PFC$^{\rm 2D}$[L]. Chinese Journal of Geotechnical Engineering, 2008(5):625-631.
[9]	周健, 池毓蔚, 池永, 等. 砂土双轴试验的颗粒流模拟[J]. 岩土工程学报, 2000(6):701-704.
	Zhou J, Chi Y W, Chi Y, et al. Simulation of biaxial test on sand by particle flow code[J]. Chinese Journal of Geotechnical Engineering, 2000(6):701-704.
[10]	郑俊杰, 苗晨曦, 张军, 等. 土工格栅与砂土接触界面细观特性离散元研究[J]. 华中科技大学学报(自然科学版), 2013,41(7):5-9.
	Zheng J J, Miao C X, Zhang J, et al. Study on mesoscopical properties of interface between geogrid and sand by DEM[J]. Journal of Huazhong Unversity of Science and Technology (Nature Science), 2013,41(7):5-9.
[11]	林永亮, 张波, 张孟喜, 等. 网格状带齿加筋体界面特性的宏细观力学机制研究[J]. 岩土力学, 2013,34(10):2863-2868.
	Lin Y L, Zhang B, Zhang M X, et al. Micro and meso-mechanism study of interface behavior of earth reinforced with denti-inclusions[J]. Rock and Soil Mechanics, 2013,34(10):2863-2868.
[12]	Dyer M R. Observation of the stress distribution in crushed glass with applications to soil reinforcement[D]. Oxford: University of Oxford, 1985.

[1]	邓放, 韩桂来, 刘美宽, 丁珏, 翁培奋, 姜宗林. 不同飞行高度下超声速来流/射流及其相互作用的数值模拟[J]. 上海大学学报(自然科学版), 2021, 27(2): 307-324.
[2]	赵慧玲, 王振江. 预应力工字型围护桩接头的抗剪性能[J]. 上海大学学报(自然科学版), 2020, 26(4): 640-650.
[3]	狄勤丰, 王楠, 陈锋, 王文昌, 牛新明, 张金成. 油井管螺纹接头力学特性的研究进展[J]. 上海大学学报(自然科学版), 2020, 26(2): 163-180.
[4]	陈博, 何幼桦. 缺失数据下滑动平均模型的估计方法[J]. 上海大学学报(自然科学版), 2020, 26(2): 181-188.
[5]	刘迪, 肖依, 江旭伟, 李红, 俞鸣明, 任慕苏, 孙晋良. SiC/UHMWPE 复合装甲板抗侵彻性能的试验与数值模拟[J]. 上海大学学报(自然科学版), 2020, 26(2): 234-243.
[6]	顾婕, 张孟喜. 基于强度折减理论的加筋土边坡稳定性分析[J]. 上海大学学报(自然科学版), 2019, 25(6): 990-1002.
[7]	刘旭, 徐金明, 刘绍峰. 基于正交试验的围护结构变形影响因素[J]. 上海大学学报(自然科学版), 2019, 25(6): 1003-1012.
[8]	高俊丽, 李厚伟, 曹威. 加肋土工膜与土工布界面模型试验与数值模拟[J]. 上海大学学报(自然科学版), 2019, 25(2): 317-327.
[9]	曹耀中, 姚文娟, 程泽坤. 吹填淤泥下桶式基础结构土压力及位移分析[J]. 上海大学学报(自然科学版), 2019, 25(2): 328-336.
[10]	陆烨, 孙汉清, 李航. 改进型 DIC 技术在静压桩模型试验中的应用[J]. 上海大学学报(自然科学版), 2018, 24(6): 993-1001.
[11]	郝军利, 赵静, 仲红刚, 徐智帅, 李仁兴, 翟启杰. PMO作用下连铸二冷区电磁场-流场-温度场的数值模拟[J]. 上海大学学报(自然科学版), 2018, 24(3): 412-421.
[12]	朱宏达, 雷作胜, 郭加宏. 高频调幅交变电磁场中金属液滴悬浮振荡特性的数值模拟分析[J]. 上海大学学报(自然科学版), 2018, 24(2): 249-256.
[13]	张亚辉1, 张孟喜1, 陈强2, 王东2, 罗康军2. 典型松散体边坡滚石运动距离的运动学分析[J]. 上海大学学报(自然科学版), 2017, 23(6): 949-.
[14]	李航, 陆烨, 孙康. 标准砂直剪试验的PFC 数值模拟[J]. 上海大学学报(自然科学版), 2017, 23(5): 780-788.
[15]	张曙梅1, 徐向荣1, 徐浩2, 周涛1, 李双1, 李妍1. 基于多元相场理论的细菌生物膜生长动力学建模及其数值模拟[J]. 上海大学学报(自然科学版), 2017, 23(4): 563-574.