利用简化曲线交会法初步确定HDPE 土工膜厚度
Preliminary Determination of HDPE Geomembrane Thickness Using Simplified Curve Intersection Method
薛霞 1汪万升 2李旺林 2王波雷 3卢岳4
作者信息
- 1. 济南大学水利与环境学院,济南 250002;山东省水利科学研究院,济南 250013
- 2. 济南大学水利与环境学院,济南 250002
- 3. 中国电建集团西北勘测设计研究院有限公司,西安 710065
- 4. 青岛市水利勘测设计研究院有限公司,济南 250013
- 折叠
摘要
采用曲线交会法确定平原水库库盘土工膜厚度时,存在材料特性曲线难获得、需多次读图取数、重复试验次数多、可选择性小等不便之处.为此,基于曲线交会法的基本原理和材料弹性阶段的线弹性与双曲线应力-应变本构关系,推导了初步确定高密度聚乙烯(HDPE)土工膜厚度的简化曲线交会法(包括简化线弹性法和简化双曲线法),并对新疆某平原水库HDPE 土工膜厚度的选取进行了计算分析.结果表明:①与曲线交会法相比,简化曲线交会法计算误差较小,拉应力安全系数误差平均约为2.22％,应变安全系数误差平均约为-4.24％,说明该方法较为准确合理;②当其他条件相同时,正方形孔隙拉应力安全系数最低,以其为该工程安全运用的判断基准;③对同一孔隙条件,安全系数随土工膜厚度增加而增加,且呈近似线性关系;④通过计算得到满足安全系数要求的HDPE 土工膜厚度范围为≥0.5 mm.简化曲线交会法有助于土工膜厚度确定时的便捷计算,可以满足工程设计阶段初步确定HDPE 土工膜厚度的要求.
Abstract
Some inconveniences arise in determining the thickness of geomembrane in plain reservoir basins using the curve intersection method.Such inconveniences include the difficulty in obtaining material's characteristic curves,the need for multiple readings of figures and curves,repeated tension tests,and limited selectivity.To ad-dress these challenges,we present a simplified curve intersection method(comprising a simplified linear elastic method and a simplified hyperbolic method)for determining the thickness of HDPE geomembrane based on the fun-damental principle of the curve intersection method and the linear elastic and hyperbolic stress-strain constitutive re-lationships observed during the elastic stage of materials.As a case study,we calculated the thickness of HDPE geomembrane in a plain reservoir in Xinjiang using the proposed method.The results indicated the following:1)compared to the curve intersection method,the proposed simplified curve intersection method demonstrated a slight calculation error.The average error of the safety factor of tensile stress was approximately 2.22％,while that of strain safety factor was around-4.24％.These findings suggest that the proposed method is reasonably accurate.2)In identical conditions,square pores exhibited the lowest safety factor of tensile stress,which can be taken as the criterion for determining the safe operation of projects.3)Under the same pore conditions,the safety factor in-creased approximately linearly with the thickness of geomembrane.4)The calculated thickness range of HDPE geomembrane satisfying the safety factor requirements was not less than 0.5 mm.The simplified curve intersection method enables convenient calculation of geomembrane thickness,meeting the demands of determining HDPE geomembrane thickness during the engineering design phase.
关键词
土工膜厚度/曲线交会法/简化线弹性法/简化双曲线法/安全系数/平原水库Key words
geomembrane thickness/curve intersection method/simplified linear elastic method/simplified hyper-bolic method/safety factor/reservoir in plain region引用本文复制引用
基金项目
山东省自然科学基金(ZR2019MEE106)
出版年
2024
国家科技期刊平台
NSTL
万方数据