坡前水位降落对边坡稳定性影响试验  

The Experiment of the Influence of Water Level Drop on Slope Stability

作　　者：曾万福 ZENG Wan-fu(Hezhang County Water Affairs Bureau,Bijie 553200,Guizhou,China)

机构地区：[1]赫章县水务局,贵州毕节553200

出　　处：《水利科技与经济》2021年第9期68-73,共6页Water Conservancy Science and Technology and Economy

摘　　要：基于室内模型试验模拟水位降落过程中边坡渗流场变化,得到不同坡形、降落速度、土体材料和降落差对边坡渗流场及稳定的影响。研究表明,边坡水位下降初期,边坡内外孔隙水压力差值随着边坡水位的下降逐渐增大;边坡水位下降后期,边坡前缘水位趋于稳定,边坡内外孔隙水压力差值逐渐减小,边坡渗流场接近稳定状态。渗透性能好的土体,当边坡前缘水位处于稳定状态后,边坡内部孔隙水压力衰减速度较渗透性差的土体快,水位下降对边坡稳定性的不利影响更显著、时间也更久。水位降落速率、落差和坡形均对边坡有显著影响,随着水位降落速率增大、落差增大和坡比增大,边坡更易失稳发生破坏。Based on the indoor model test,this paper simulates the change of slope seepage field in the process of water level falling,and obtains the influence of different slope shape,falling velocity,soil material and falling difference on the slope seepage field and stability.The results show that the difference of pore water pressure inside and outside the slope increases with the decrease of slope water level in the initial stage of slope water level decline.In the later stage of slope water level decline,the front edge water level of slope tends to be stable,the difference of pore water pressure inside and outside the slope gradually decreases,and the seepage field of slope is close to the stable state.When the water level at the front edge of the slope is stable,the attenuation speed of pore water pressure in the soil with good permeability is faster than that in the soil with poor permeability,and the adverse effect of water level drop on the stability of the slope is more significant and longer.With the increase of water level falling rate,fall and slope ratio,the slope is more prone to failure.

关 键 词：室内试验 水位降落 边坡稳定性 渗流场 

分 类 号：TU432[建筑科学—岩土工程]