考虑流固耦合的水位降雨共同作用下荆江岸坡应力位移场分析
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摘要
为了研究水位升降与降雨共同作用下荆江高滩岸坡应力位移的变化规律,根据该河段的地质水文条件,应用Geo-Studio软件对岸坡进行了流固耦合数值模拟。结果表明,岸坡最大剪应力分布由坡面向坡底逐渐增大;水位上升,同一岸坡点所受剪应力随之减小,岸坡位移指向坡内;水位下降,同一岸坡点所受剪应力随之增大,岸坡位移指向坡外,此时叠加降雨作用将导致坡顶向外位移进一步增大,对岸坡稳定非常不利,需重点监控;水位升降对坡脚位移的影响较大,降雨主要引起坡顶向外不利位移,需分别加强岸坡坡脚和坡顶的位移监测工作。
In order to study the variation laws of the stress and displacement fields of the bank slope under the joint effects of water level variation and rainfall,according to the geological and hydrological characteristics of Jingjiang reaches,the fluid-solid coupling numerical analysis of bank slope was carried out by using software Geo-Studio.The results show that the maximum shear stress of slope increases gradually from the slope surface to the deep inside slope.As the water level rises,the shear stress of bank slope decreases,and the slope appears a displacement towards the bankside.As the water level drops,the shear stress of bank slope increases,and the displacement of bank slope points towards the riverside,the superimposed rainfall will further cause the outward displacement of slope top to increase,which is very unfavorable to the stability of bank slope and should be monitored specially.The water level variation has the greatest impact on the displacement of slope toe,while the rainfall mainly increase the adverse outward displacement of slope top.Therefore,the displacement monitoring of slope toe and slope top should be strengthened respectively.
In order to study the variation laws of the stress and displacement fields of the bank slope under the joint effects of water level variation and rainfall,according to the geological and hydrological characteristics of Jingjiang reaches,the fluid-solid coupling numerical analysis of bank slope was carried out by using software Geo-Studio.The results show that the maximum shear stress of slope increases gradually from the slope surface to the deep inside slope.As the water level rises,the shear stress of bank slope decreases,and the slope appears a displacement towards the bankside.As the water level drops,the shear stress of bank slope increases,and the displacement of bank slope points towards the riverside,the superimposed rainfall will further cause the outward displacement of slope top to increase,which is very unfavorable to the stability of bank slope and should be monitored specially.The water level variation has the greatest impact on the displacement of slope toe,while the rainfall mainly increase the adverse outward displacement of slope top.Therefore,the displacement monitoring of slope toe and slope top should be strengthened respectively.
引文
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[2]万文.水位循环升降下库岸边坡渗流与应力耦合分析及稳定性研究[D].南昌:南昌大学,2012.
[3]Kim Y,Jeong S.Modeling of Shallow Landslides in an Unsaturated Soil Slope Using a Coupled Model[J].Geomechanics and Engineering,2017,13(2):353-370.
[4]LIU Junxin,YANG Chunhe,GAN Jianjun,et al.Stability Analysis of Road Embankment Slope Subjected to Rainfall Considering Runoff-Unsaturated Seepage and Unsaturated Fluid-Solid Coupling[J].International Journal of Civil Engineering,2017,15(6):865-876.
[5]方景成,邓华锋,肖瑶,等.库水和降雨联合作用下岸坡稳定影响因素敏感性分析[J].水利水电技术,2017,48(3):146-152.
[6]SUN Guanhua,YANG Yongtao,CHENG Shengguo,et al.Phreatic Line Calculation and Stability Analysis of Slopes under the Combined Effect of Reservoir Water Level Fluctuations and Rainfall[J].Canadian Geotechnical Journal,2016,54(5):1-47.
[7]刘磊,殷坤龙,徐勇,等.考虑降雨及库水位变动的区域滑坡灾害稳定性评价研究[J].岩石力学与工程学报,2018,37(2):403-414.
[8]陈晓平,茜平一,梁志松,等.非均质土坝稳定性的渗流场和应力场耦合分析[J].岩土力学,2004,25(6):860-864.
[9]谭彬政,陶桂兰,宋云涛,等.长江水位下降及降雨条件下荆江河段岸坡渗流特性研究[J].水电能源科学,2016,34(6):119-122.