摘要
库岸路基边坡随水位变化发生沉降或隆起,产生不均匀竖向变形,从而使库岸公路出现局部沉陷、向下滑移,路面开裂等病害,必须采取合理的加固处治措施。采用有限元软件GEO-STUDIO中的SIGMA/W模块,以冷清公路库岸边坡为原型,建立计算用饱和-非饱和土岸坡的概化模型,并考虑渗流场-应力场耦合,分析库岸路基边坡在库水作用下锚加固和桩加固前后竖向变形(隆起或沉降)的变化。分析表明:未加固情况下,随着库水位升高和在正常蓄水位运行,坡体及其路面隆起,库水位降低坡体及其路面在先前变形的基础上发生沉降变形。在桩加固的情况下,沉降或隆起变形均比未加固情况的沉降或隆起变形小很多。在锚加固区域及其上部坡体,隆起或沉降变形也较未加固情况小很多。桩加固或锚加固后均使路面各点的垂直位移最大值和均值减小,垂直位移随水位变化率减小,路面相近点之间的隆起或沉降位移差减小。
Reservoir bank roadbed slope will be settled or uplifted with the water level fluctuation and caused uneven vertical deforma- tion. Thus bring about reservoir bank highway appearing disorders of local settlement, downward gliding, and pavement cracking, so that rational reinforce treatment measures should be adopted. Using SIGMA/W module in the finite element software GEO - STUDIO, taking the Lengdun - Qingshuihe highway reservoir bank slope as the prototype, established computation saturated - unsaturated soil bank slope generalized model, considering seepage field - stress field coupling, analyzed reservoir bank roadbed slope ve^lical delbnna- tion （uplift or settlement） under reservoir water action before and after anchor reinforcement and pile reinforcement. Tile analyses haw~ shown that under without reinforcement, along with reservoir water level rising or under normal water level, slope mass and pavement uplift; reservoir water level lowering, slope mass and pavement settled on the basis of previous deformation. Under pile reinforcement, settlement or uplift deformation are all much smaller than under without reinforcement. In anchor reinforcement area and its upper slope mass, uplift or settlement deformation also much smaller than under without reinforcement. After pile or anchor reinforcement can make pavement each point vertical displacement crest value and mean value decreased; vertical displacement along with water level variation rate decreased; uplift or settlement differential displacement between close points on pavement decreased.
出处
《中国煤炭地质》
2018年第1期52-59,共8页
Coal Geology of China
基金
云南省交通运输厅科技项目:库岸公路破坏形式及对策研究(云交科2014(A)16)
关键词
库岸路基边坡
锚加固
桩加固
竖向变形
垂直位移
reservoir bank roadbed slope
anchor reinforcement
pile reinforcement
vertical deformation
vertical displacement
