库水位骤降后面板缺陷坝体渗漏量和坝坡稳定性分析
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摘要
为研究库水位变动情况下面板不同缺陷的面板堆石坝渗透稳定特性,利用著名岩土分析软件Geo-studio的Seep/w与Slope/w模块,以浙江省临海市西部括苍镇境内某面板堆石坝为例,对不同土工膜缺陷及库水位变动工况的组合进行了渗流特性及稳定性的数值模拟分析,得到了浸润线,渗漏量及稳定性系数的变化曲线,计算结果表明:(1)面板一旦发生缺陷,静库水位下坝体的浸润线有一个明显的抬升,缺陷尺寸越大,浸润线高程越高,但是差异不大。库水位高程越高,静库水位下坝体内部的浸润线高程也就越高;(2)库水位水平越高,缺陷尺寸越大,坝体渗漏量也就越大;(3)库水位骤降下面板坝内部浸润线呈现先疏后密的规律,库水位下降速率越大,上游坝体浸润线疏的部分则越疏。在库水位骤降经过面板坝缺陷高程时,有一个浸润线突降的过程;(4)从整体上看,上游坝坡的稳定性系数要大于下游坝坡的稳定性系数;静库水位下,库水位水平越高,上游坝坡稳定性系数越大,而下游坝坡稳定性系数则越小,缺陷位置越高,稳定性系数越低;库水位骤降情况下上游坝坡稳定性系数随库水位下降呈现先下降后上升的趋势,下游坝坡则呈现一直上升的规律,一旦面板发生缺陷,稳定性系数较完整面板来说有一个较大幅度的下降,面板缺陷尺寸越大,稳定性系数整体上越小。
In order to study the seepage stability characteristics of face rockfill dam with different face slab defects under the condition of reservoir water level change,the Seep/w and Slope/w modules of the famous geotechnical analysis software Geo-studio are used. Taking a face rockfill dam in Jiecang Town,west of Linhai City,Zhejiang Province as an example,the seepage characteristics and stability of different geomembrane defects and reservoir water level are analyzed by numerical silulation,and the infiltration line is obtained. The results show that:( 1) once the defect occurs in the face slab,there is an obvious uplift of the seepage line of the dam body under the static reservoir water level. And the size of the defect is larger. The higher the height of the infiltrating line,the smaller the difference. The higher the water level,the higher the height of the infiltration line inside the dam body under the static reservoir water level;( 2) the higher the water level,the larger the defect size,the greater the leakage of the dam body;( 3) under the sudden drop of reservoir water level,the inner soakage line of concrete face rockfill dam shows the law of thinning first and then dense. The larger the falling rate of reservoir water level is,the less the sparse part of the infiltration line of upstream dam body is. When the reservoir water level suddenly drops through the defective elevation of the face slab dam,there is a process of sudden decline of the infiltrating line;( 4) the safety factor of the upstream dam slope is larger than that of the downstream dam slope as a whole; under the static reservoir water level,the higher the reservoir water level is,the higher the upstream water level is. The higher the safety factor of dam slope,the smaller the safety factor of downstream dam slope,the higher the defect location and the lower the safety factor. In the case of sudden drop of reservoir water level,the safety factor of upstream dam slope decreases first and then increases with the decrease of reservoir water level,and the downstream dam slope shows the law of rising all the time,once the face slab is defective,the safety factor is lower than that of the whole panel,and the larger the defect size,the smaller the safety factor as a whole.
In order to study the seepage stability characteristics of face rockfill dam with different face slab defects under the condition of reservoir water level change,the Seep/w and Slope/w modules of the famous geotechnical analysis software Geo-studio are used. Taking a face rockfill dam in Jiecang Town,west of Linhai City,Zhejiang Province as an example,the seepage characteristics and stability of different geomembrane defects and reservoir water level are analyzed by numerical silulation,and the infiltration line is obtained. The results show that:( 1) once the defect occurs in the face slab,there is an obvious uplift of the seepage line of the dam body under the static reservoir water level. And the size of the defect is larger. The higher the height of the infiltrating line,the smaller the difference. The higher the water level,the higher the height of the infiltration line inside the dam body under the static reservoir water level;( 2) the higher the water level,the larger the defect size,the greater the leakage of the dam body;( 3) under the sudden drop of reservoir water level,the inner soakage line of concrete face rockfill dam shows the law of thinning first and then dense. The larger the falling rate of reservoir water level is,the less the sparse part of the infiltration line of upstream dam body is. When the reservoir water level suddenly drops through the defective elevation of the face slab dam,there is a process of sudden decline of the infiltrating line;( 4) the safety factor of the upstream dam slope is larger than that of the downstream dam slope as a whole; under the static reservoir water level,the higher the reservoir water level is,the higher the upstream water level is. The higher the safety factor of dam slope,the smaller the safety factor of downstream dam slope,the higher the defect location and the lower the safety factor. In the case of sudden drop of reservoir water level,the safety factor of upstream dam slope decreases first and then increases with the decrease of reservoir water level,and the downstream dam slope shows the law of rising all the time,once the face slab is defective,the safety factor is lower than that of the whole panel,and the larger the defect size,the smaller the safety factor as a whole.
引文
[1]张嘎,张建民,洪镝.面板堆石坝面板出现裂缝工况下的渗流分析[J].水利学报,2005,36(4):420-425.ZHANG Ga, ZHANG Jianmin, HONG Di. The seepage analysis of the face-faced rockfill dam in the condition of fracture[J]. Water Resources Journal,2005,36(4):420-425.
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[3]许光祥,张永兴,哈秋舲.粗糙裂隙渗流的超立方和次立方定律及其试验研究[J].水利学报,2003,34(3):74-79.XU Guangxiang, ZHANG Yongxing, HA Qiuling.Hypercubic and subcubic laws of rough fracture seepage and their experimental study[J]. Journal of Water Conservancy,2003,34(3):74-79.
[4]毛昶熙.渗流计算分析与控制[M].北京:水利电力出版社,1990.MAO Changxi. Analysis and control of seepage calculation[M]. Beijing:Water Conservancy and Electric Power Press,1990.
[5]周志芳,李艳.清江隔河岩水利工程河间地块渗估算[J].河海大学学报(自然科学版),1996(5):101-104.ZHOU Zhifang, LI Yan. Infiltration estimation of interriver block in Geheyan water conservancy project of Qingjiang River[J]. Journal of Hehai University(Natural Science),1996(5):101-104.
[6]高俊,党发宁,王振华.混凝土面板堆石坝局部止水缝失效渗透稳定分析[J].西安理工大学学报,2015(2):220-224.GAO Jun,DANG Faning,WANG Zhenhua. Failure seepage stability analysis of local sealing joints of concrete faced rockfill dam[J]. Journal of Xi’an University of Technology,2015(2):220-224.
[7]李炎隆,王瑞骏,李守义,等.混凝土面板堆石坝面板缝隙渗流计算模型研究[J].应用力学学报,2010,27(1):145-150.LI Yanlong,WANG Ruijun,LI Shouyi,et al. Study on the seepage model of concrete face slab of rockfill dam[J]. Journal of Applied Mechanics,2010,27(1):145-150.
[8]吕高峰,王玉洁,朱锦杰.某面板堆石坝垂直缝破损渗漏量估算方法的适用性分析[J].水电能源科学,2015(5):65-68.LYU Gaofeng,WANG Yujie,ZHU Jinjie. Analysis on the applicability of the method for estimating the damage and leakage of vertical joints in a face rockfill dam[J]. Hydro Energy Science,2015(5):65-68.
[9]岑威钧,和浩楠,温朗昇.防渗土工膜的缺陷特性与缺陷渗漏研究进展[J].河海大学学报(自然科学版),2017(1):36-44.CEN Weijun,HE Haonan,WEN Langsheng. Research progress on defect characteristics and defect leakage of impermeable geomembrane[J]. Journal of Hehai University(Natural Science Edition),2017(1):36-44.
[10]岑威钧,王蒙,杨志祥.(复合)土工膜防渗土石坝饱和-非饱和渗流特性[J].水利水电科技进展,2012(3):6-9.CEN Weijun, WANG Meng, YANG Zhixiang.Saturated-unsaturated seepage characteristics of geomembrane impervious earth-rock dam[J]. Progress in Science and Technology of Water Conservancy and Hydropower,2012(3):6-9.
[11]孙丹,沈振中,崔健健.土工膜缺陷引起的土工膜防渗砂砾石坝渗漏数值模拟[J].水电能源科学,2013(4):69-73.SUN Dan,SHEN Zhenzhong,CUI Jianjian. Numerical simulation of geomembrane impermeable sand-gravel dam leakage caused by geomembrane defect[J]. Hydro Energy Science,2013(4):69-73.
[12]李传奇,李超超,王帅,等.平原水库土工膜防渗特性分析[J].长江科学院院报,2016(4):135-139.LI Chuanqi, LI Chaochao, WANG Shuai, et al.Analysis of impervious characteristics of geomembrane in plain reservoir[J]. Journal of the Yangtze Academy of Sciences,2016(4):135-139.
[13]FREDLUND D G,XING A. Equations for the soilwater characteristic curve[J]. Canadian Geotechnical Journal,1994,31(4):521-532.广告
[2]王瑞骏,吕海东,李炎隆.堆石坝混凝土面板裂缝的渗流形态及计算模型[J].水资源与水工程学报,2008,19(1):15-18.WANG Ruijun,LYU Haidong,LI Yanlong. Seepage pattern and calculation model of concrete slab cracks in rockfill dam[J]. Journal of Water Resources and Water Engineering,2008,19(1):15-18.
[3]许光祥,张永兴,哈秋舲.粗糙裂隙渗流的超立方和次立方定律及其试验研究[J].水利学报,2003,34(3):74-79.XU Guangxiang, ZHANG Yongxing, HA Qiuling.Hypercubic and subcubic laws of rough fracture seepage and their experimental study[J]. Journal of Water Conservancy,2003,34(3):74-79.
[4]毛昶熙.渗流计算分析与控制[M].北京:水利电力出版社,1990.MAO Changxi. Analysis and control of seepage calculation[M]. Beijing:Water Conservancy and Electric Power Press,1990.
[5]周志芳,李艳.清江隔河岩水利工程河间地块渗估算[J].河海大学学报(自然科学版),1996(5):101-104.ZHOU Zhifang, LI Yan. Infiltration estimation of interriver block in Geheyan water conservancy project of Qingjiang River[J]. Journal of Hehai University(Natural Science),1996(5):101-104.
[6]高俊,党发宁,王振华.混凝土面板堆石坝局部止水缝失效渗透稳定分析[J].西安理工大学学报,2015(2):220-224.GAO Jun,DANG Faning,WANG Zhenhua. Failure seepage stability analysis of local sealing joints of concrete faced rockfill dam[J]. Journal of Xi’an University of Technology,2015(2):220-224.
[7]李炎隆,王瑞骏,李守义,等.混凝土面板堆石坝面板缝隙渗流计算模型研究[J].应用力学学报,2010,27(1):145-150.LI Yanlong,WANG Ruijun,LI Shouyi,et al. Study on the seepage model of concrete face slab of rockfill dam[J]. Journal of Applied Mechanics,2010,27(1):145-150.
[8]吕高峰,王玉洁,朱锦杰.某面板堆石坝垂直缝破损渗漏量估算方法的适用性分析[J].水电能源科学,2015(5):65-68.LYU Gaofeng,WANG Yujie,ZHU Jinjie. Analysis on the applicability of the method for estimating the damage and leakage of vertical joints in a face rockfill dam[J]. Hydro Energy Science,2015(5):65-68.
[9]岑威钧,和浩楠,温朗昇.防渗土工膜的缺陷特性与缺陷渗漏研究进展[J].河海大学学报(自然科学版),2017(1):36-44.CEN Weijun,HE Haonan,WEN Langsheng. Research progress on defect characteristics and defect leakage of impermeable geomembrane[J]. Journal of Hehai University(Natural Science Edition),2017(1):36-44.
[10]岑威钧,王蒙,杨志祥.(复合)土工膜防渗土石坝饱和-非饱和渗流特性[J].水利水电科技进展,2012(3):6-9.CEN Weijun, WANG Meng, YANG Zhixiang.Saturated-unsaturated seepage characteristics of geomembrane impervious earth-rock dam[J]. Progress in Science and Technology of Water Conservancy and Hydropower,2012(3):6-9.
[11]孙丹,沈振中,崔健健.土工膜缺陷引起的土工膜防渗砂砾石坝渗漏数值模拟[J].水电能源科学,2013(4):69-73.SUN Dan,SHEN Zhenzhong,CUI Jianjian. Numerical simulation of geomembrane impermeable sand-gravel dam leakage caused by geomembrane defect[J]. Hydro Energy Science,2013(4):69-73.
[12]李传奇,李超超,王帅,等.平原水库土工膜防渗特性分析[J].长江科学院院报,2016(4):135-139.LI Chuanqi, LI Chaochao, WANG Shuai, et al.Analysis of impervious characteristics of geomembrane in plain reservoir[J]. Journal of the Yangtze Academy of Sciences,2016(4):135-139.
[13]FREDLUND D G,XING A. Equations for the soilwater characteristic curve[J]. Canadian Geotechnical Journal,1994,31(4):521-532.广告
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