天然水垫塘护坡板块优化结构型式实验研究
发布时间：2018-09-09 15:30
【摘要】：护坡不护底的天然水垫塘常具有优越的下游水垫条件,相对于底部基岩,护坡的运行安全更加需要关注.而且,水垫塘护坡破坏的工程事故时有发生.依托乌东德水弹性模型,模拟了护坡板块止水局部破坏的最不利情况,考虑不排水、封闭自排、封闭抽排和透水板块等4种结构型式,对板块与基岩间隙和板块靠水垫塘一侧表面的时均及脉动压强差进行了研究,并通过加密测点、控制缝隙、板块开槽及倾斜钻孔等手段保证结果与实际相符.设计工况下,不排水板块受到的瞬时压强差峰值较大,严重威胁护坡运行安全,封闭自排和透水板块能够有效平衡间隙内外压强,受力条件较好;透水板块间隙内外脉压相关性最高,不排水板块最低,封闭自排板块相关性与测点到排水孔距离成反比,与实际相符.运用随机过程时空相关函数,阐明了护坡板块破坏主要是由于间隙内外水位差产生的时均压强和背/迎水面脉动不相关性导致,与背/迎水面流速和相位差无关.综合考虑各种板块结构的特点,提出了护坡板块优化型式推荐方案.
[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) 国家自然科学基金资助项目(51579173,51309177,51509180) 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】：TV32;TV861
[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) 国家自然科学基金资助项目(51579173,51309177,51509180) 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】：TV32;TV861
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