發(fā)布時間：2018-09-09 15:30

【摘要】：護坡不護底的天然水墊塘常具有優(yōu)越的下游水墊條件,相對于底部基巖,護坡的運行安全更加需要關(guān)注.而且,水墊塘護坡破壞的工程事故時有發(fā)生.依托烏東德水彈性模型,模擬了護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,對板塊與基巖間隙和板塊靠水墊塘一側(cè)表面的時均及脈動壓強差進行了研究,并通過加密測點、控制縫隙、板塊開槽及傾斜鉆孔等手段保證結(jié)果與實際相符.設(shè)計工況下,不排水板塊受到的瞬時壓強差峰值較大,嚴重威脅護坡運行安全,封閉自排和透水板塊能夠有效平衡間隙內(nèi)外壓強,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)性與測點到排水孔距離成反比,與實際相符.運用隨機過程時空相關(guān)函數(shù),闡明了護坡板塊破壞主要是由于間隙內(nèi)外水位差產(chǎn)生的時均壓強和背/迎水面脈動不相關(guān)性導(dǎo)致,與背/迎水面流速和相位差無關(guān).綜合考慮各種板塊結(jié)構(gòu)的特點,提出了護坡板塊優(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家重點實驗室;
【基金】：國家重點研發(fā)計劃資助項目(2016YFC0401707) 國家自然科學(xué)基金資助項目(51579173,51309177,51509180) 國家自然基金委創(chuàng)新團隊資助項目(51621092) 科技部重點領(lǐng)域創(chuàng)新團隊資助項目(2014RA4031) 高等學(xué)校學(xué)科創(chuàng)新引智計劃資助項目(B14012) 天津市重點領(lǐng)域創(chuàng)新團隊資助項目(2014TDA001)~~
【分類號】：TV32;TV861

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