高土石围堰复合土工膜应变集中计算方法研究

doi:10.13722/j.cnki.jrme.2015.0121

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摘要复合土工膜是由高分子聚合物制成的一种平面柔性薄膜并在其侧面黏有织物的土工合成材料，因其具有良好的防渗性能及施工简便等优点而得到广泛应用。针对我国水电工程中大量运用复合土工膜快速修建高水头土石围堰过程中普遍存在拉断、撕裂等集中破坏渗漏现象，分析发现复合土工膜在刚性基础锚固或防渗墙接头等工程结构物的软硬交界区域因应变集中且超出其极限延伸率而导致结构性的损坏，而目前计算方法均难以反映该性状。从复合土工膜材料力学性能、复合膜与周围填料及锚固接头相互作用机制出发，参照面板坝周边缝单元有限元处理模式，建立反映复合土工膜应变集中的“周边膜”单元的几何与物理描述方法，并将其本构关系及位移模式植入三维有限元程序，计算获取了高度为85 m的白鹤滩水电站上游围堰复合土工膜应变集中部位的应变状态，为高水头、大变形等复杂受力条件下复合土工膜的安全利用和推广起到有益的理论支持作用。

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	王永明1
	邓渊1
	任金明1
	朱晟2
	蔡建国1
	梁现培1

关键词 ：土力学, 复合土工膜, 高土石围堰, 交界区域, 应变集中, 周边膜单元, 白鹤滩水电站

Abstract：Composite geomembrane is a type of geosynthetics with the main components of geomembrane at one side or both sides stuck with geotextile. Composite geomembrane has been widely applied in the field of water conservancy，transportation and disposal of nuclear waste landfill for its low permeability，strong deformation adaptability，convenient erection and dismantling. Aiming at the problem of centralized damage and leakage induced by tensile failure or tear of composite geomembrane in the extensive use of rapid construction of high water head rockfill cofferdam，some analysis were conducted and revealed that structural damages were induced by strain concentration which exceed the limit elongation of composite geomembrane located in these junctional zone between hard foundation and soft composite material. Based on the theoretical analysis of composite geomembrane material mechanical properties as well as microscopic mechanism interaction between the geomembrane and joint，the description method of geometry and physics of composite geomembrane strain concentration were suggested. The corresponding peripheral membrane element FEM prediction mode was also put forward based on the treatment method of Concrete Face Rockfill Dam peripheral joint. The constitutive relation and displacement model were planted in the 3D FEM program. The strain concentration behavior of geomembrane in Baihetan hydropower 85 m height earth-rock cofferdam was obtained. Valuable data and conclusions were obtained to guide the safe utilization and generalization of composite geomembrane in high water head condition and complex stress state.

Key words： soil mechanics composite geomembrane high earth-rock cofferdam junctional zone strain concentration peripheral membrane element Baihetan hydropower

引用本文:

王永明1，邓渊1，任金明1，朱晟2，蔡建国1，梁现培1. 高土石围堰复合土工膜应变集中计算方法研究[J]. 岩石力学与工程学报, 2016, 35(S1): 3299-3307.
WANG Yongming1，DENG Yuan1，REN Jinming1，ZHU Sheng2，CAI Jianguo1，LIANG Xianpei1. Study of calculation methods of composite geomembrane concentration in high earthrock cofferdam. , 2016, 35(S1): 3299-3307.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0121 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS1/3299

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[3]	GIROUDJP，TISSEAU B，SODERMAN KL，et al. Analysis of strain concentration next to geomembrane seams[J]. Geosynthetics International，1995，2(6)：255-276.
[4]	GIROUDJP，SODERMANKL.Design of structure connected to geomembranes[J]. Geosynthetics International，1995，2(2)：379-428.
[5]	GIROUDJP，SODERMANKL.Comparison of geomembranes subjected to differential settlement[J]. Geosynthetics International，1995，2(6)：953-968.
[6]	KODIKARAJ. Analysis of tension development in geomembrane placed on landfill slopes[J]. Geotextiles and Geomembranes，2000，18：47-61.
[7]	TOGNONR，MOOREID. Geomembrane strain observed in large-scale testing of protection layers[J]. Journalof Geotechnical and Geo-enviromental Engineering，ASCE，2000，126(12)：1194-1208.
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[10]	岑威钧，沈长松，李星，等.堤坝中防渗(复合)土工膜的布置型式及计算理论研究[J]. 红水河，2004，23(3)：70-74.(CEN Weijun，SHEN Changsong，LI Xing，et al. Study on layout pattern and computation theory of impervious(composite) geomembrane in dike and dam[J]. Hongshui River，2004，23(3)：70-74.(in Chinese))
[11]	中国水电顾问集团华东勘测设计研究院. 金沙江白鹤水电站施工导流专题研究报告[R]. 杭州：中国水电顾问集团华东勘测设计研究院，2011.(HydroChina Huadong Engineering Corporation. A special report on construction diversion of Jinsha river Baihetan hydropower[R].Hanzhou：HydroChina Huadong Engineering Corporation，2011.(in Chinese))
[12]	顾淦臣，束一鸣，沈长松. 土石坝工程经验与创新[M]. 北京：中国电力出版社，2004：247-248.(GUGancheng，SHU Yiming，SHEN Changsong. Experience and innovation of Earth rock-fill dam Engineering[M].Beijing：China Electric Power Press，2004：247-248.(in Chinese))
[13]	岑威钧，沈长松，童建文. 深厚覆盖层上复合土工膜防渗堆石坝筑坝特性研究[J].岩土力学，2009，30(1)：175-180.(CEN Weijun，SHEN Changsong，TONG Jianwen. Study of construction behavior of composite geomembrane rockfill dam on thick alluvium deposit[J].Rock and Soil Mechanics，2009，30(1)：175-180.(in Chinese))
[14]	王永明，任金明，陈永红，等. 基于混凝土多轴强度的高土石围堰防渗墙安全性研究[J].岩石力学与工程学报，2014，33(增1)：2 662-2 669.(WANGYongming，REN Jinming，CHENYonghong，et al. Research on high earth rock cofferdam impervious wall security based on multi-axial strength of concrete[J].Chinese Journal ofRock Mechanics and Engineering，2014，33(Supp.1)：2 662-2669.(in Chinese))
[15]	DUNCAN J M，CHANG G Y. Non-linear analysis of stresses and strain in soils[J]. Journal of the Soil Mechanics and Foundations Division，1970，96(5)：1 629-1 652.
[16]	李青云，程展林. 三峡工程二期围堰运行后性状分析[J].岩土工程学报，2005，27(4)：410-413.(LI Qingyun，CHENG Zhanlin. Analysis of the behavior of stage II of cofferdam of TGP[J].Chinese Journal ofGeotechnical Engineering，2005，27(4)：410-413.(in Chinese))
[17]	刘斯宏，徐永福.粒状体直剪试验的数值模拟与微观考察[J].岩石力学与工程学报，2001，20(3)：288-292.(LIUSihong，XU Yongfu. Numerical simulation for a direct box shear test on granular material and microscopicand microscopicconsideration[J].Chinese Journal ofRock Mechanics and Engineering，2001，20(3)：288-292.(in Chinese))
[1]	花加凤，束一鸣，张贵科，等. 土石坝坝面防渗膜中的夹具效应[J].水利水电科技进展，2007，27(2)：66-68.(HUA Jiafeng，SHU Yiming，ZHANGGuike，et al. Clamping effect in geomembranes used for seepage control of upstream surface of earth rock dam[J].Advances in Science and Technology of water Resources，2007，27(2)：66-68.(in Chinese))
[2]	曹克明，汪易森，徐建军，等. 混凝土面板堆石坝[M].北京：中国水利水电出版社，2008：312-313.(CAO Keming，WANGYisen，XUJiangjun，et al. Concreteface rockfill dam[M].Beijing：China Waterand Power，2008：312-313.(in Chinese))
[3]	GIROUDJP，TISSEAU B，SODERMAN KL，et al. Analysis of strain concentration next to geomembrane seams[J]. Geosynthetics International，1995，2(6)：255-276.
[4]	GIROUDJP，SODERMANKL.Design of structure connected to geomembranes[J]. Geosynthetics International，1995，2(2)：379-428.
[5]	GIROUDJP，SODERMANKL.Comparison of geomembranes subjected to differential settlement[J]. Geosynthetics International，1995，2(6)：953-968.
[6]	KODIKARAJ. Analysis of tension development in geomembrane placed on landfill slopes[J]. Geotextiles and Geomembranes，2000，18：47-61.
[7]	TOGNONR，MOOREID. Geomembrane strain observed in large-scale testing of protection layers[J]. Journalof Geotechnical and Geo-enviromental Engineering，ASCE，2000，126(12)：1194-1208.
[8]	ZHU B，GAO D，CHEN YM. Geomembrane tensions and strains resulting from differential settlement around rigid circular structures[J]. Geotexts and Geomembranes，2009，27：53-62.
[9]	沈长松，顾淦臣.复合土工膜厚度计算方法研究[J].河海大学学报. 2004，32(4)：395-398.(SHEN Changsong，GUGancheng. Calculationmethod for thickness of composite geomembrane[J]..Journal of Hohai University，2004，32(4)：395-398.(in Chinese))
[10]	岑威钧，沈长松，李星，等.堤坝中防渗(复合)土工膜的布置型式及计算理论研究[J]. 红水河，2004，23(3)：70-74.(CEN Weijun，SHEN Changsong，LI Xing，et al. Study on layout pattern and computation theory of impervious(composite) geomembrane in dike and dam[J]. Hongshui River，2004，23(3)：70-74.(in Chinese))
[11]	中国水电顾问集团华东勘测设计研究院. 金沙江白鹤水电站施工导流专题研究报告[R]. 杭州：中国水电顾问集团华东勘测设计研究院，2011.(HydroChina Huadong Engineering Corporation. A special report on construction diversion of Jinsha river Baihetan hydropower[R].Hanzhou：HydroChina Huadong Engineering Corporation，2011.(in Chinese))
[12]	顾淦臣，束一鸣，沈长松. 土石坝工程经验与创新[M]. 北京：中国电力出版社，2004：247-248.(GUGancheng，SHU Yiming，SHEN Changsong. Experience and innovation of Earth rock-fill dam Engineering[M].Beijing：China Electric Power Press，2004：247-248.(in Chinese))
[13]	岑威钧，沈长松，童建文. 深厚覆盖层上复合土工膜防渗堆石坝筑坝特性研究[J].岩土力学，2009，30(1)：175-180.(CEN Weijun，SHEN Changsong，TONG Jianwen. Study of construction behavior of composite geomembrane rockfill dam on thick alluvium deposit[J].Rock and Soil Mechanics，2009，30(1)：175-180.(in Chinese))
[14]	王永明，任金明，陈永红，等. 基于混凝土多轴强度的高土石围堰防渗墙安全性研究[J].岩石力学与工程学报，2014，33(增1)：2 662-2 669.(WANGYongming，REN Jinming，CHENYonghong，et al. Research on high earth rock cofferdam impervious wall security based on multi-axial strength of concrete[J].Chinese Journal ofRock Mechanics and Engineering，2014，33(Supp.1)：2 662-2669.(in Chinese))
[15]	DUNCAN J M，CHANG G Y. Non-linear analysis of stresses and strain in soils[J]. Journal of the Soil Mechanics and Foundations Division，1970，96(5)：1 629-1 652.
[16]	李青云，程展林. 三峡工程二期围堰运行后性状分析[J].岩土工程学报，2005，27(4)：410-413.(LI Qingyun，CHENG Zhanlin. Analysis of the behavior of stage II of cofferdam of TGP[J].Chinese Journal ofGeotechnical Engineering，2005，27(4)：410-413.(in Chinese))
[17]	刘斯宏，徐永福.粒状体直剪试验的数值模拟与微观考察[J].岩石力学与工程学报，2001，20(3)：288-292.(LIUSihong，XU Yongfu. Numerical simulation for a direct box shear test on granular material and microscopicand microscopicconsideration[J].Chinese Journal ofRock Mechanics and Engineering，2001，20(3)：288-292.(in Chinese))