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对库盘铺膜平原水库的气胀现象产生机制进行了理论探讨和现场试验研究。分析指出围坝填筑、库水位快速下降及地下水位上升等因素是导致膜下产生气胀的主要原因。在德州大屯水库进行了现场试验,模拟了不同膜上荷重、不同地下水位上升幅度和速率等试验工况,对膜下地层不同埋深处孔隙压力和膜下气胀现象进行了观测,分析了各因素对膜下气胀变化规律影响。试验结果表明,地下水位快速上升能够引起膜下气胀压力加大,地下水位上升幅度影响膜下气胀压力的大小;不同地下水位上升速率对膜下气场影响较小,在膜上设置一定荷载可较好地防止膜顶托或胀破。
The mechanism of the inflation phenomenon in reservoir reservoir plains reservoir was discussed theoretically and field experiment. The analysis shows that filling of dam, rapid decline of reservoir water level and rise of groundwater level are the main reasons leading to inflation under membrane. Field experiments were carried out in Datun reservoir of Dezhou to simulate the test conditions such as the load on different membranes, the rate and rate of rise of groundwater table, and the pore pressure and membrane swell at different depths were observed and analyzed The various factors on the inflatable membrane changes in the law. The experimental results show that the rapid rise of groundwater level can cause the pressure of gas expansion under the membrane to increase, and the increase of groundwater level affects the pressure of the gas expansion under the membrane. The rate of rise of different groundwater levels has little effect on the gas field under the membrane. Loading can be better to prevent the top of the film or bursting.