考虑土石坝坝基接触带性能演化的渗流稳定分析  

作　　者：刘妍[1] 李毅[2] 

机构地区：[1]湖南水利水电职业技术学院,长沙410131 [2]长沙理工大学,长沙410114

出　　处：《科技创新与应用》2024年第17期76-81,共6页Technology Innovation and Application

基　　金：2020年湖南省职业院校教育教学改革研究项目(ZJGB2020189)。

摘　　要：为分析土石坝在渗流及变形长期作用下坝基接触带性能及变化规律,基于水力耦合的分析方法,以某水库工程不同时期得到的坝基和坝基接触带渗透系数,建立土石坝坝基接触带渗透性能与力学参数演化模型,把握坝体及坝基材料物理力学特性、渗透特性的演化规律,对水库长期处于正常蓄水位情况下的渗流场及应力场进行分析。研究表明,由于水流的长期渗流作用,导致坝基接触带中的土壤流失,渗透系数增大,进而导致通过坝坡面、两岸山体的渗漏量增大。考虑水力耦合对坝体变形稳定的影响,研究发现,在水库运行期间,坝基接触带的强度是不断降低的,接触带的屈服区增加,变形量不断增大,安全系数随运行时间的增加不断降低。In order to analyze the performance and variation law of dam foundation contact zone of earth-rockfill dam under the long-term action of seepage and deformation,based on the analysis method of hydraulic coupling,based on the permeability coefficient of dam foundation and dam foundation contact zone obtained in different periods of a reservoir project,the evolution model of permeability and mechanical parameters of earth-rockfill dam foundation contact zone is established,and the evolution law of physical and mechanical properties and permeability characteristics of dam body and dam foundation materials are grasped.The seepage field and stress field of the reservoir under the condition of normal water level for a long time are analyzed.The study shows that due to the long-term seepage of water flow,the soil in the contact zone of the dam foundation is lost,and the permeability coefficient increases,which leads to the increase of leakage through the dam slope and the mountains on both sides.Considering the influence of hydraulic coupling on the deformation and stability of the dam,it is found that during the operation of the reservoir,the strength of the contact zone of the dam foundation decreases,the yield zone of the contact zone increases,the deformation increases,and the safety factor decreases with the increase of running time.

关 键 词：土石坝 坝基接触带 渗透性能 演化模型 水力耦合 

分 类 号：TU46[建筑科学—结构工程]