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| RESEARCH ON HIGH EARTH-ROCK COFFERDAM IMPERVIOUS WALL SECURITY BASED ON MULTIAXIAL STRENGTH OF CONCRETE |
| WANG Yongming，REN Jinming，CHEN Yonghong，CAI Jianguo |
| (HydroChina Huadong Engineering Corporation，Hangzhou，Zhejiang 310014，China) |
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Abstract Plastic concrete was widely used in foundation impermeability treatment，especially in impervious wall of high earth rock cofferdam. There were no special guiding regulation and standard about testing method and corresponding structure calculation security evaluation criteria for this material. The triaxial compression test of rock earth material was utilized to obtain the deformation and strength parameters of plastic concrete and stress level was used to measure the safety of concrete impervious wall. But stress level was introduced in triaxial shear state of soil. It adapts for Mohr-Coulomb friction strength theory of granular material safe state. Complex stress state of deep concrete impervious wall material safety check should be carried out through the concrete strength theory. Security criterion which contains multiaxial strength of concrete was introduced. The Baihetan high earth-rock cofferdam whose impervious wall reaches 50 m is taken as an example. Comprehensive three- dimensional finite element calculation was conducted to analyze the safety state of cofferdam. The differences of safety index based on stress level and safety criterion were found. It show that the safety criterion than the stress level can be more sensitive to reflect the impervious wall security state. Stress level could reflect the safety status of the wall when the element positioned in three-dimensional compressed state. The security criterion should be used for safety check when the tensile stress region is obvious.
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Received: 27 May 2013
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| [1] 中华人民共和国行业标准编写组 SD128—86土工试验规程[S]. 北京：中国水利水电出版社，1986.(The Professional Standard Compilation Group of People?s Republic of China. SD128—86. Specification of soil test[S]. Beijing：China Water Power Press，1986.(in Chinese))
[2] 张小平，包承纲，施 斌. 柔性混凝土的长期特性及对三峡二期围堰运行的影响[J]. 岩土工程学报，2001，23(6)：677–681.(ZHANG Xiaoping，BAO Chenggang，SHI Bin. Long term characteristic of flexible concrete and its effect on phase-cofferdam in Three Gorges[J]. Chinese Journal of Geotechnical Engineering，2001，23(6)：677–681.(in Chinese))
[3] 包承纲. 包承纲岩土工程研究文集[M]. 武汉：长江出版社，2007：46–57.(Bao Chenggang. Bao Chenggang selected papers on study of geotechnical engineering[M]. Wuhan：Changjiang Press，2007：46–57. (in Chinese))
[4] 中华人民共和国国家标准编写组. GB 50010—2010混凝土结构设计规范[S]. 北京：中国建筑工业出版社，2010.(The National Standard Compilation Group of People?s Republic of China. GB 50010—2010 Code for deign of concrete structure[S]. Beijing：China Architecture and Building Press，2010.(in Chinese))
[5] 中国水电顾问集团华东勘测设计研究院. 金沙江白鹤水电站可行性研究报告[R]. 杭州：华东勘测设计院，2011.(HydroChina Huadong Engineering Corporation. Feasibility study report of Jinsha river Baihetan hydropower station[R]. Hanzhou：HydroChina Huadong Engineering Corporation，2011.(in Chinese))
[6] 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))
[7] 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.
[8] DUNCAN J M，BYRNE P，WONG K，et al. Strength，stress-strain and bulk modulus parameters for finite element analysis of stresses and movements in soil masses[R]. Berkrly：University of California，1980.
[9] 包承纲，刘松涛. 长江三峡工程关键技术研究[M]. 广州：广东科技出版社，2002：363–387.(BAO Chenggang，LIU Songtao. Research on key technology of Three Gorges Engineering[M]. Guangzhou：Guangdong Science Press，2002：363–387.(in Chinese))
[10] 包承纲，刘松涛，龚壁卫. 长江三峡围堰混凝土防渗墙方案应力应变非线性有限元分析综合报告[J]. 长江科学院院报，1986，1(1)：21–33. BAO Chenggang，LIU Songtao，GONG Biwei. Report on the non-linear finite element analysis of stress and strain in the cutoff concrete walls of the Three Gorge Cofferdam Project[J]. Journal of Yangtze River Scientific Research Institute，1986，1(1)：21–33.(in Chinese))
[11] 张小平，包承纲，施 斌，等. 柔性混凝土的抗拉特性试验研究[J]. 水利水电技术，2001，32(7)：39–43.(ZHANG Xiaoping，BAO Chenggang，SHI Bin. et all. Experimental study on tension of flexible concrete[J].Water Resource and Hydropower Engineering，2001，32(7)：39–43.(in Chinese))
[12] 郑守仁，王世华，夏仲平. 导截流及围堰工程[M]. 北京：中国水利电力出版社，2004：882–890. (ZHEN Shouren，WANG Shihua，XIA Zhongpin. River diversion，closure and cofferdam engineering[M]. Beijing：China Water Power Press，2004：882–890.(in Chinese))
[13] 朱俊高，李 飞，胡永胜，等. 不同破坏准则下防渗墙安全度比较分析[J]. 水利水电科技进展，2012，32(3)：19–23.(ZHU Jungao，LI Fei，HU Yongsheng，et al. Analysis of safety factor of diaphragm wall with different failure criteria[J]. Advances in Science and Technology of Water Resources，2012，32(3)：19–23.(in Chinese)) |
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2014, Vol. 33 
