【摘要】：護(hù)坡不護(hù)底的天然水墊塘常具有優(yōu)越的下游水墊條件,相對(duì)于底部基巖,護(hù)坡的運(yùn)行安全更加需要關(guān)注.而且,水墊塘護(hù)坡破壞的工程事故時(shí)有發(fā)生.依托烏東德水彈性模型,模擬了護(hù)坡板塊止水局部破壞的最不利情況,考慮不排水、封閉自排、封閉抽排和透水板塊等4種結(jié)構(gòu)型式,對(duì)板塊與基巖間隙和板塊靠水墊塘一側(cè)表面的時(shí)均及脈動(dòng)壓強(qiáng)差進(jìn)行了研究,并通過(guò)加密測(cè)點(diǎn)、控制縫隙、板塊開(kāi)槽及傾斜鉆孔等手段保證結(jié)果與實(shí)際相符.設(shè)計(jì)工況下,不排水板塊受到的瞬時(shí)壓強(qiáng)差峰值較大,嚴(yán)重威脅護(hù)坡運(yùn)行安全,封閉自排和透水板塊能夠有效平衡間隙內(nèi)外壓強(qiáng),受力條件較好;透水板塊間隙內(nèi)外脈壓相關(guān)性最高,不排水板塊最低,封閉自排板塊相關(guān)性與測(cè)點(diǎn)到排水孔距離成反比,與實(shí)際相符.運(yùn)用隨機(jī)過(guò)程時(shí)空相關(guān)函數(shù),闡明了護(hù)坡板塊破壞主要是由于間隙內(nèi)外水位差產(chǎn)生的時(shí)均壓強(qiáng)和背/迎水面脈動(dòng)不相關(guān)性導(dǎo)致,與背/迎水面流速和相位差無(wú)關(guān).綜合考慮各種板塊結(jié)構(gòu)的特點(diǎn),提出了護(hù)坡板塊優(yōu)化型式推薦方案.
[Abstract]:Natural water cushion ponds without bottom protection often have superior downstream water cushion conditions, and the operational safety of slope protection is more important than that of bottom bedrock. Moreover, the water cushion pond slope protection damage engineering accident has occurred from time to time. Based on the hydroelastic model of Wudong Germany, this paper simulates the most disadvantageous condition of the local damage of the slope protection plate, considering the four structural patterns of non-drainage, closed self-drainage, closed drainage and permeable plate. The time average and pulsating pressure difference between the plate and the bedrock and the side surface of the plate against the water cushion pond are studied. The results are in agreement with the practice by means of infilling the measuring points, controlling the gap, slotting the plate and drilling the slant hole. Under the design condition, the peak value of instantaneous pressure difference of undrained plate is larger, which seriously threatens the safety of slope protection. The closed self-discharge and permeable plate can effectively balance the pressure inside and outside the clearance, and the stress condition is better. The correlation of pulse pressure inside and outside the gap of permeable plate is the highest, and the undrained plate is the lowest. The correlation of closed self-draining plate is inversely proportional to the distance from the measuring point to the drainage hole, which is consistent with the actual situation. By using the time-space correlation function of stochastic process, it is shown that the failure of slope protection plate is mainly due to the non-correlation between the time-averaged pressure and the back / water pulsation caused by the water level difference inside and outside the gap, and is independent of the back / water velocity and phase difference. Considering the characteristics of various plate structures, a recommended scheme for slope protection plate optimization is put forward.
【作者單位】： 天津大學(xué)水利工程仿真與安全國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃資助項(xiàng)目(2016YFC0401707) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51579173,51309177,51509180) 國(guó)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(lèi)號(hào)】：TV32;TV861

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