水垫塘波面高度对不利工况下护坡安全的影响
发布时间：2018-11-25 10:04
【摘要】：水垫塘护坡板块破坏的工程事故近年来时有发生,依托乌东德水弹性模型,考虑护坡板块处于排水失效且止水局部破坏的最不利工况,对护坡靠基岩一侧表面(背水面)和靠水垫塘一侧表面(迎水面)的时均及脉动压强差进行试验研究,结果表明板块背水面和迎水面的水位差导致的渗流压力与脉动压力不相关性所产生的瞬时脉压差共同构成了导致护坡破坏的上举力,渗流压力主要受水垫塘内波面高度的影响。因此,对水垫塘内波面高度的空间和概率分布进行试验研究。从空间分布上来说,不同工况下,普遍具有水舌落水点附近波面高度最大,与水舌落水点桩号相近的边坡处波面高度次之,随着桩号向坝下静水区和二道坝方向变化,则波面高度逐渐减小的特点。从概率分布上来说,借鉴海浪统计学的研究,采用Gram-Charlier级数型函数描述其概率分布,通过数据拟合发现,该函数相比正态分布能更好地符合渗流压力(波面高度)的实际概率分布。对于迎、背水面所受的脉动压力,认为其服从正态分布。因此,护坡板块的破坏是一列服从Gram-Charlier级数型分布的随机过程(渗流压力)和两列相互独立的服从正态分布的随机过程(迎、背水面脉动压力)共同作用的结果。考虑护坡板块的受力特点和破坏机理,分析了传统的水垫塘安全监控指标的适用性及可能产生的偏差。
[Abstract]:In recent years, engineering accidents of slope protection plate damage in water cushion ponds have occurred from time to time. Relying on the hydroelastic model of Wudong Germany, the slope protection plate is considered to be in the most unfavorable condition of drainage failure and local damage of water stop. The time average and pulsating pressure difference of the side surface of the slope against the bedrock (back surface) and the side surface of the water cushion pond (towards the water surface) are studied experimentally. The results show that the instantaneous pulse pressure difference caused by the water level difference between the plate back water surface and the water face is not related to the pulsating pressure, which constitutes the upward lift force which leads to the slope protection failure. The seepage pressure is mainly affected by the height of the wave surface in the water cushion pond. Therefore, the spatial and probability distribution of wave surface height in water cushion pond is studied experimentally. In terms of spatial distribution, under different working conditions, the wave surface height near the water tongue drop point is the largest, and the wave surface height at the slope near the water tongue drop point pile number is the second, which changes with the change of the pile number in the hydrostatic zone under the dam and in the direction of the second dam. Then the wave surface height decreases gradually. In terms of probability distribution, the probability distribution is described by using Gram-Charlier series function for reference to the study of ocean wave statistics, and it is found by data fitting. Compared with normal distribution, this function is more suitable for the actual probability distribution of seepage pressure (wave surface height). The pulsating pressure on the back water surface is considered to be normal distribution. Therefore, the failure of slope protection plate is the result of a series of random processes (seepage pressure) distributed from Gram-Charlier series and two independent sequences of random processes of normal distribution (welcome, back water pulsation pressure). Considering the stress characteristics and failure mechanism of slope protection plate, the applicability and possible deviation of the traditional water cushion pond safety monitoring index are analyzed.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家重点研发计划资助项目(2016YFC0401707) 国家自然科学基金创新研究群体科学基金资助项目(51021004);国家自然科学基金资助项目(51579173;51309177;51779167;51509180) 国家自然基金委创新团队资助项目(51621092) 科技部重点领域创新团队资助项目(2014RA4031) 高等学校学科创新引智计划资助项目(B14012) 天津市重点领域创新团队资助项目(2014TDA001)
【分类号】：TV86
[Abstract]:In recent years, engineering accidents of slope protection plate damage in water cushion ponds have occurred from time to time. Relying on the hydroelastic model of Wudong Germany, the slope protection plate is considered to be in the most unfavorable condition of drainage failure and local damage of water stop. The time average and pulsating pressure difference of the side surface of the slope against the bedrock (back surface) and the side surface of the water cushion pond (towards the water surface) are studied experimentally. The results show that the instantaneous pulse pressure difference caused by the water level difference between the plate back water surface and the water face is not related to the pulsating pressure, which constitutes the upward lift force which leads to the slope protection failure. The seepage pressure is mainly affected by the height of the wave surface in the water cushion pond. Therefore, the spatial and probability distribution of wave surface height in water cushion pond is studied experimentally. In terms of spatial distribution, under different working conditions, the wave surface height near the water tongue drop point is the largest, and the wave surface height at the slope near the water tongue drop point pile number is the second, which changes with the change of the pile number in the hydrostatic zone under the dam and in the direction of the second dam. Then the wave surface height decreases gradually. In terms of probability distribution, the probability distribution is described by using Gram-Charlier series function for reference to the study of ocean wave statistics, and it is found by data fitting. Compared with normal distribution, this function is more suitable for the actual probability distribution of seepage pressure (wave surface height). The pulsating pressure on the back water surface is considered to be normal distribution. Therefore, the failure of slope protection plate is the result of a series of random processes (seepage pressure) distributed from Gram-Charlier series and two independent sequences of random processes of normal distribution (welcome, back water pulsation pressure). Considering the stress characteristics and failure mechanism of slope protection plate, the applicability and possible deviation of the traditional water cushion pond safety monitoring index are analyzed.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家重点研发计划资助项目(2016YFC0401707) 国家自然科学基金创新研究群体科学基金资助项目(51021004);国家自然科学基金资助项目(51579173;51309177;51779167;51509180) 国家自然基金委创新团队资助项目(51621092) 科技部重点领域创新团队资助项目(2014RA4031) 高等学校学科创新引智计划资助项目(B14012) 天津市重点领域创新团队资助项目(2014TDA001)
【分类号】：TV86
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