长江科学院院报 ›› 2022, Vol. 39 ›› Issue (4): 111-115.DOI: 10.11988/ckyyb.20201244

• 岩土工程 • 上一篇    下一篇

不同铺设及联接型式的复合土工膜围堰应力变形特性

徐晗, 李波, 潘家军, 李浩民   

  1. 长江科学院 水利部岩土力学与工程重点实验室,武汉 430010
  • 收稿日期:2020-12-02 修回日期:2021-01-31 出版日期:2022-04-01 发布日期:2021-08-03
  • 作者简介:徐 晗(1978-),男,湖北公安人,正高级工程师,博士,研究方向为土工数值计算与分析。E-mail:mechanics007@aliyun.com
  • 基金资助:
    国家自然科学基金-雅砻江联合基金重点项目(U1765203);国家自然科学基金项目(51979009);长江科学院中央级公益性科研院所基本科研业务费项目(CKSF2019394/GC)

Stress and Deformation Characteristics of Composite Geomembrane Cofferdam with Different Patterns of Laying and Connection

XU Han, LI Bo, PAN Jia-jun, LI Hao-min   

  1. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China
  • Received:2020-12-02 Revised:2021-01-31 Online:2022-04-01 Published:2021-08-03

摘要: 改进复合土工膜的铺设和联接型式,增强其对堰体变形的适应性,是将复合土工膜作为防渗体系的土石围堰设计的关键。开展复合土工膜围堰的离心模型试验,得到蓄水期土工膜应变分布规律;采用ABAQUS软件提供的薄膜单元M3D4模拟了离心模型试验,获得不同铺设及联接型式复合土工膜应力变形空间分布特性,并将数值模拟结果与离心模型试验结果进行比较。结果表明:S型铺设的土工膜受力比直线型铺设的土工膜受力合理;S型铺设锚固联接土工膜起到了加筋作用,降低了围堰的沉降变形;土工膜在锚固联接处局部有应变集中部位,柔性联接介于锚固联接与无联接之间,变形协调性更强;采用的土工膜模拟算法能较好地反映离心模型试验的成果。

关键词: 复合土工膜围堰, 离心模型, 铺设型式, 联接型式, 薄膜单元

Abstract: To improve the laying and connection type of composite geomembrane and to enhance its adaptability to cofferdam deformation is the key to the design of earth-rock cofferdam with composite geomembrane as seepage control system. Centrifugal model test was carried out to obtain the strain distribution of geomembrane in water-storage period; numerical simulation of the centrifugal model test was also conducted by using the membrane unit M3D4 provided by ABAQUS to acquire the spatial distribution characteristics of stress and deformation of composite geomembrane with different laying and connection patterns. The numerical simulation results were compared with the centrifugal model test results, and the comparison illustrated that the stress of geomembrane laid in an S-shape was more reasonable than that in linear type as the S-shape plays a reinforcing role and reduces the settlement of cofferdam. Strain concentrated in the connection part of geomembrane and the restraint effect of flexible connection is between that of anchorage connection and unconstrained connection, implying stronger deformation compatibility. The results of centrifugal model test can be well reflected by the geomembrane simulation algorithm.

Key words: composite geomembrane cofferdam, centrifugal model, laying type, connection type, membrane element

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