非稳定状态下土石坝渗流及坝坡稳定分析
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摘要
以云南省鱼龙水库为例,基于达西定律与渗流理论,并结合Geo-Studio有限元模块分析了上游正常蓄水位分别在10、15、20d内降落至死水位时坝体内部渗流场及临水坡面安全系数变化情况。结果表明,库水位在10、15、20d由正常蓄水位降落至死水位时,20d降落工况的坝体内部渗流场对坝坡稳定影响最小,坝体内部浸润线的降落速率与库水位下降速率密切相关,其浸润线分布密集变化缓慢,且该工况安全稳定系数最大为1.80,说明坝体内部渗流场变化越缓慢,土石坝坝坡安全稳定性越好。
Taking Yulong Reservoir in Yunnan Province as an example,based on the Darcy's law and seepage theory,combined with Geo-Studio finite element module,the variation of seepage field and safety factor of slope surface in the upper reaches of the dam were analyzed when the normal storage level falls to the dead water level within 10,15 and 20 days,respectively.The results show that when the reservoir water level falls from the normal storage level to the dead level in 10,15 and 20 days,the seepage field inside the dam at the 20 days falling operation condition has the smallest impact on the stability of the dam slope.The falling rate of the infiltration line inside the dam is closely related to the falling rate of the reservoir water level.The distribution of the infiltration line changes slowly,and the maximum safety and stability factor is 1.80,which indicates that the slower the change of seepage field inside dam body is,the better the safety and stability of earth-rock dam slope is.
Taking Yulong Reservoir in Yunnan Province as an example,based on the Darcy's law and seepage theory,combined with Geo-Studio finite element module,the variation of seepage field and safety factor of slope surface in the upper reaches of the dam were analyzed when the normal storage level falls to the dead water level within 10,15 and 20 days,respectively.The results show that when the reservoir water level falls from the normal storage level to the dead level in 10,15 and 20 days,the seepage field inside the dam at the 20 days falling operation condition has the smallest impact on the stability of the dam slope.The falling rate of the infiltration line inside the dam is closely related to the falling rate of the reservoir water level.The distribution of the infiltration line changes slowly,and the maximum safety and stability factor is 1.80,which indicates that the slower the change of seepage field inside dam body is,the better the safety and stability of earth-rock dam slope is.
引文
[1]付成华,陈敏林,周洪波.基于有限元法的土石坝非稳定渗流坝体浸润线简化计算条件分析[J].长江科学院院报,2004(4):60-62.
[2]岳庆河,刘福胜.非稳定渗流作用下土石坝边坡稳定分析[J].中国农村水利水电,2008(11):66-68.
[3]周志杰,沈振中.超高心墙坝渗流随机场的建模及其特性分析[J].水电能源科学,2016,34(9):80-83.
[4]刘桃溪,辛全才,解晓峰,等.张沟均质土石坝渗流和坝坡稳定分析[J].人民黄河,2012,34(3):120-122.
[5]王科,王常明,王彬,等.基于Morgenstern-Price法和强度折减法的边坡稳定性对比分析[J].吉林大学学报:地球科学版,2013,43(3):902-907.
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[2]岳庆河,刘福胜.非稳定渗流作用下土石坝边坡稳定分析[J].中国农村水利水电,2008(11):66-68.
[3]周志杰,沈振中.超高心墙坝渗流随机场的建模及其特性分析[J].水电能源科学,2016,34(9):80-83.
[4]刘桃溪,辛全才,解晓峰,等.张沟均质土石坝渗流和坝坡稳定分析[J].人民黄河,2012,34(3):120-122.
[5]王科,王常明,王彬,等.基于Morgenstern-Price法和强度折减法的边坡稳定性对比分析[J].吉林大学学报:地球科学版,2013,43(3):902-907.
[6]韩瑜,李松德.土石坝心墙内浸润线的逸出高度[J].西安理工大学学报,2000(2):204-206.
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