平原水库运行条件下的土工膜气胀试验研究

发布时间：2018-05-19 17:32

本文选题：平原水库 + 土工膜　；参考：《河海大学学报(自然科学版)》2017年06期

【摘要】：为研究土工膜气胀及其与地下水位上升、水库蓄水及库水位骤降等影响因素的关系,研制了土工膜气胀模型试验装置,并对不同模拟工况下的土工膜位移、膜下气压、吸力、孔隙水压力以及竖向土压力的变化规律进行了试验研究。结果表明:膜下气压和孔隙水压力均随地下水位上升而增大,其大小由地下水位上升幅度决定;当地下水位与土工膜之间的非饱和区域较小时,膜下孔隙压力受库水荷载作用增加显著,在蓄水初期极易引发土工膜气胀变形,建议在膜上设置一定压重防止土工膜被顶起;膜下孔隙压力变化滞后于膜上荷载,库水位骤降时,膜下气压将大于膜上荷载,从而引起土工膜气胀破坏。
[Abstract]:In order to study the relationship between geomembrane inflation and its influence factors, such as the rise of groundwater level, reservoir water storage and sudden drop of reservoir water level, a geomembrane model test device was developed, and the geomembrane displacement, pressure and suction under different simulated conditions were studied. The variation of pore water pressure and vertical earth pressure is studied experimentally. The results show that the pressure and pore water pressure increase with the increase of groundwater level, which is determined by the increase of groundwater level, and when the unsaturated area between groundwater level and geomembrane is small, The pore pressure under the film is obviously increased by the water load, and it is easy to cause the geomembrane to inflate and deform in the early stage of water storage. It is suggested that a certain pressure should be set on the membrane to prevent the film from topping, and the change of the pore pressure under the membrane is lagging behind the load on the film. When the reservoir water level drops suddenly, the pressure under the film will be larger than the load on the membrane, which will cause the geomembrane to inflate and destroy.
【作者单位】：河海大学水利水电学院;中国电建华东勘测设计研究院有限公司;
【基金】：国家科技支撑计划(2015BAB07B05) 国家青年科学基金(51509077) 浙江省港航局科技计划(2015-2-42) 中央高校基本科研业务费专项(2016B03514,SJLX16_0205)
【分类号】：TV41

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