水土保持学报2017，Vol.31Issue(3)：79-84,6.DOI:10.13870/j.cnki.stbcxb.2017.03.014
三峡水库消落带淹水-落干交替下紫色土力学特性变化模拟
Simulation of the Changes in Purple Soil Mechanical Properties in Response to Alternate Submergence and Exposure in the Riparian Zone of the Three Gorges Reservoir
摘要
Abstract
The riparian zone of the Three Gorges Reservoir undergoes high-pressure water submergence and alternate wet-dry condition,leading to changes in soil mechanical properties,influencing soil erodibility and bank instability.Based on the wide distribution of purple soil in the Three Gorges Reservoir,we simulated the hydraulic effect and the process of alternate submergence and exposure,researched stress-strain and shear strength of purple soil in response to high-pressure water submergence and wet-dry cycles.Till now,how soil mechanic properties response is not clear.It was found that water column pressure,and the frequency and magnitude of wet-dry cycles significantly drove the changes in soil mechanical properties.Compared with CK,stiffness increased,the decreasing rate of cohesion became slower,but the internal fraction angle increased with increasing water column pressure.With the increasing number of wet-dry cycles,stiffness and cohension decreased,while the internal fraction angle increased.The shear strength decreased quickly with increasing amplitude of wet-dry cycles under the same confining pressure.Compared with CK,the purple soil which suffered minor amplitude of wet-dry cycles showed a significant increasing trend in the internal fraction angle and a decreasing trend in cohesion.关键词
三峡水库/消落带/干湿交替/抗剪强度/应力-应变/紫色土Key words
Three Gorges Reservoir/riparian zone/wet-dry cycles/soil shear strength/stress-strain/purple soil分类
农业科技引用本文复制引用
吕发友,鲍玉海,贺秀斌,张淑娟,唐强,王铭烽,曹植菁..三峡水库消落带淹水-落干交替下紫色土力学特性变化模拟[J].水土保持学报,2017,31(3):79-84,6.基金项目
国家自然科学基金项目(41571278,41301290) （41571278,41301290）
中国科学院科技服务网络计划项目(KFJ-SW-STS-175) （KFJ-SW-STS-175）
中国科学院“西部之光”人才培养引进计划(2013&2016) （2013&2016）
