长河坝坝基廊道应力变形特性研究

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (335 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要深厚覆盖层上的长河坝心墙堆石坝坝高 240 m ，坝基防渗墙采用顶部设置灌浆廊道的方式与坝体心墙相连接，廊道受力条件复杂，已有类似工程出现廊道破坏导致漏水的现象。采用基于子模型法的三维非线性有限元对该部位结构进行重点研究，以薄层单元模拟各种接触面，坝体材料及覆盖层采用 Duncan 双曲线 <> E -<>μ 模型，考虑大坝实际填筑施工过程和水库蓄水过程，对坝基廊道与防渗墙的应力变形状况进行分析。计算结果表明，由于在河床段沿坝轴线均不设横缝，廊道横河向正应力值较大，且极值出现在左右岸 1/4 跨的位置；廊道底板顺河向拉应力较大，将导致底板产生纵向裂缝；廊道与两岸灌浆平洞的结构缝三向变形形态复杂，止水设计困难。应对廊道的结构型式进行调整以及采取一定的工程措施以保障防渗系统的安全性。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	熊堃
	何蕴龙
	伍小玉
	董园林

关键词 ：长河坝水电站, 心墙堆石坝, 廊道, 防渗墙, 子模型法

Abstract：Changheba core wall rockfill dam 240 m in height is located on thick alluvium deposit. A grouting gallery is arranged at the top of the underground cut-off wall to connect the foundation diaphragm with the impervious dam core. This kind of gallery is subject to complicated loads, and some galleries have already been cracked and leaked in actual similar projects. Based on the sub-model method, three-dimensional nonlinear finite element analysis is performed to study the stress and deformation behaviors of the foundation gallery and cut-off wall. The thin-l ayer element is used to simulate the contact surfaces. The filling material s of this dam and alluvium deposit are simulated by means of the Duncan hyperbola <>E-<>μ constitutive model. Meanwhile the actual dam construction process and reservoir impounding process are considered as well. The results demonstrate that the longitudinal stress of the gallery is quite high for the lack of transverse joint along the riverbed sections and the stress extremum appears on the one-fourth section at both sides. The high transverse tensile stress will cause longitudinal cracks at the bottom of gallery. The structural joints between the galleries in riverbed and abutments have complex relative deformations in three directions and as a result, it's difficult to design the joint seal. Therefore the structural style of the gallery should be improved and some engineering measures need to be adopted to ensure the safety of the seepage control system of the dam.

Key words： Changheba Hydropower Station core wall rockfill dam gallery cut-off wall sub-mode method

收稿日期: 2012-01-06

:	TV641.1
	TV640.35

作者简介: 熊堃 (1984 – ) ，男，湖北谷城人，博士，从事水工结构研究。

引用本文:

熊堃，何蕴龙，伍小玉，董园林. 长河坝坝基廊道应力变形特性研究[J]. 岩土工程学报, 2011, 33(11): 1767-1774. XIONG Kun, HE Yun-long, WU Xiao-yu, DONG Yuan-lin. Stress and deformation behavior of foundation gallery of Changheba Hydropower Station. Chinese J. Geot. Eng., 2011, 33(11): 1767-1774.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2011/V33/I11/1767

[1]张建华 , 严军 , 吴基昌 , 等 . 瀑布沟水电站枢纽工程关键技术综述 [J]. 四川水力发电 , 2006, 25 (3): 8 – 11. (ZHANG Jian-hua, YAN Jun, WU Ji-chang, et al. Summary of key technology for pubugou hydropower project[J]. Sichuan Water Power, 2006, 25 (3): 8 – 11. (in Chinese))
[2] 王平 , 李浩伟 . 硗碛水电站砾石土心墙堆石坝基础处理设计 [C]// 现代堆石坝技术进展 : 2009—— 第一届堆石坝国际研讨会论文集 . 北京 : 中国水利水电出版社 , 2009: 226 – 232. ( WANG Ping, LI Wei-hao. Foundation treatment design of the rockfill dam with gravel-soil core in Qiaoqi hydropower station[C]// Modern Rockfill Dams: 2009 ——Proceeding of the First International Symposium on Rockfill Dam. Beijing: China WaterPower Press, 2009 . 226 – 232. (in Chinese) )
[3] 窦向贤 , 庞家麟 , 陈钰鑫 . 四川省杂谷脑河狮子坪水电站深厚覆盖层坝基处理设计 [C]// 利用覆盖层建坝的实践与发展 . 北京 : 中国水利水电出版社 , 2009: 116 – 120. ( DOU Xiang-xian, PANG Jia-lin, CHEN Yu-xing. Deep cover layer foundation treatment design of Shiziping hydropower station on Zagunao river in Sichuan provice[C]// Practice and development of constructing dams on deep cover layer foundation. Beijing: China WaterPower Press, 2009: 116 – 120. (in Chinese) )
[4] 肖白云 . 混凝土防渗墙墙体材料及接头型式的研究 [J]. 水力发电 , 1998(3): 29 – 31. ( XIAO Bai-yun. Study on material and connector type of concrete cut-off wall [J]. Water Power, 1998(3): 29 – 31. (in Chinese) )
[5] 陈刚 , 马光文 , 付兴友 , 等 . 瀑布沟大坝基础防渗墙廊道连接型式研究 [J]. 四川大学学报 ( 工程科学版 ), 2005, 37 (3): 32 – 36. (CHEN Gang, MA Guang-wen, FU Xing-you, et al. Research for the joint type by gallery between dam imperious wall and core wall of pubugou project[J]. Journal of Sichuan University (Engineering Science Edition), 2005, 37 (3): 32 – 36. (in Chinese))
[6] 吴秋军 , 傅少君 . 子模型方法研究瀑布沟土石坝防渗结构 [J]. 武汉大学学报 ( 工学版 ), 2006, 39 (3): 55 – 59. (WU Qiu-jun, FU Shao-jun. Study on seepage prevention structure for Pubugou earth-rock dam by sub-model method[J]. Engineering Journal of Wuhan University, 2006, 39 (3): 55 – 59. (in Chinese))
[7] 祁月 , 崔会东 , 熊春发 . 硗碛坝基廊道 0+168.12 m 结构缝变形及渗漏分析与评价 [C]// 现代堆石坝技术进展 : 2009—— 第一届堆石坝国际研讨会论文集 . 北京 : 中国水利水电出版社 , 2009: 638 – 642. (QI Yue, CUI Hui-dong, XI ONG Chun-fa. Analysis and evaluation of the gallery 0+168.12m structural joint’s deformation and leakage in Qiaoqi dam [C]// Modern Rockfill Dams: 2009 ——Proceeding of the First International Symposium on Rockfill Dam. Beijing: China WaterPower Press, 2009: 638 – 642. (in Chinese))
[8] 姚福海 . 深厚覆盖层上土石坝基础廊道的结构形式探讨 [J]. 水力发电 , 2010, 36 (6): 54 – 55, 59. (YAO Fu-hai. Study on foundation gallery structure and type of embankment dam on heavy overburden[J]. Water Power, 2010, 36 (6): 54 – 55, 59. (in Chinese))
[9] 万彪 , 何蕴龙 , 熊堃 . 有厚度节理单元开发与应用 [J]. 水电能源科学 , 2008, 26 (4): 63 – 66. (WAN Biao, HE Yun-long, XIONG Kun. Development of joint element with thickness and its application [J]. Water Resources and Power , 2008, 26 (4): 63 – 66. (in Chinese))
[10] 熊堃 , 何蕴龙 , 曹学兴 . 观音岩水电站混合坝插入式接头抗震性能研究 [J]. 天津大学学报 , 2010, 43 (7): 583 – 592. (XIONG Kun, HE Yun-long, CAO Xue-xing. Earthquake- resistant characteristics of inserted junction in composite dam of Guanyinyan hydropower station [J]. 2010, 43 (7): 583 – 592. (in Chinese))
[11] BANDIS S C, LUMSDEN A C, BARTON N R. Fundamentals of rock joint deformation[J]. International Journal of Rock Mechanics and Mining Sciences , 1983, 20 (6): 249 – 268 .
[12] CLOUGH G W, DUNCAN J M. Finite element analysis of retaining wall behavior[J]. Journal of Soil Mechanics and Foundation Engineering Division, ASCE , 1971, 97 (12): 1657 – 1673.
[13] DUNCAN J M, ZHANG C Y. Nonlinear analysis of stress and strain6 in soils[J]. Journal of Soil Mechanics and Foundation Division , 1970, 9 6(SM5): 1629 – 1653.