【摘要】：水墊塘護(hù)坡板塊破壞的工程事故近年來時(shí)有發(fā)生,依托烏東德水彈性模型,考慮護(hù)坡板塊處于排水失效且止水局部破壞的最不利工況,對護(hù)坡靠基巖一側(cè)表面(背水面)和靠水墊塘一側(cè)表面(迎水面)的時(shí)均及脈動壓強(qiáng)差進(jìn)行試驗(yàn)研究,結(jié)果表明板塊背水面和迎水面的水位差導(dǎo)致的滲流壓力與脈動壓力不相關(guān)性所產(chǎn)生的瞬時(shí)脈壓差共同構(gòu)成了導(dǎo)致護(hù)坡破壞的上舉力,滲流壓力主要受水墊塘內(nèi)波面高度的影響。因此,對水墊塘內(nèi)波面高度的空間和概率分布進(jìn)行試驗(yàn)研究。從空間分布上來說,不同工況下,普遍具有水舌落水點(diǎn)附近波面高度最大,與水舌落水點(diǎn)樁號相近的邊坡處波面高度次之,隨著樁號向壩下靜水區(qū)和二道壩方向變化,則波面高度逐漸減小的特點(diǎn)。從概率分布上來說,借鑒海浪統(tǒng)計(jì)學(xué)的研究,采用Gram-Charlier級數(shù)型函數(shù)描述其概率分布,通過數(shù)據(jù)擬合發(fā)現(xiàn),該函數(shù)相比正態(tài)分布能更好地符合滲流壓力(波面高度)的實(shí)際概率分布。對于迎、背水面所受的脈動壓力,認(rèn)為其服從正態(tài)分布。因此,護(hù)坡板塊的破壞是一列服從Gram-Charlier級數(shù)型分布的隨機(jī)過程(滲流壓力)和兩列相互獨(dú)立的服從正態(tài)分布的隨機(jī)過程(迎、背水面脈動壓力)共同作用的結(jié)果�？紤]護(hù)坡板塊的受力特點(diǎn)和破壞機(jī)理,分析了傳統(tǒng)的水墊塘安全監(jiān)控指標(biāo)的適用性及可能產(chǎn)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.
【作者單位】： 天津大學(xué)水利工程仿真與安全國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家重點(diǎn)研發(fā)計(jì)劃資助項(xiàng)目(2016YFC0401707) 國家自然科學(xué)基金創(chuàng)新研究群體科學(xué)基金資助項(xiàng)目(51021004);國家自然科學(xué)基金資助項(xiàng)目(51579173;51309177;51779167;51509180) 國家自然基金委創(chuàng)新團(tuán)隊(duì)資助項(xiàng)目(51621092) 科技部重點(diǎn)領(lǐng)域創(chuàng)新團(tuán)隊(duì)資助項(xiàng)目(2014RA4031) 高等學(xué)校學(xué)科創(chuàng)新引智計(jì)劃資助項(xiàng)目(B14012) 天津市重點(diǎn)領(lǐng)域創(chuàng)新團(tuán)隊(duì)資助項(xiàng)目(2014TDA001)
【分類號】：TV86

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