合肥工业大学学报（自然科学版）
閤肥工業大學學報（自然科學版）
합비공업대학학보（자연과학판）
JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE)
2015年
7期
984-991
,共8页
徐全%谭晓慧%辛志宇%汪贤恩%谢妍
徐全%譚曉慧%辛誌宇%汪賢恩%謝妍
서전%담효혜%신지우%왕현은%사연
非饱和土%降雨%边坡稳定%安全系数%滑动面
非飽和土%降雨%邊坡穩定%安全繫數%滑動麵
비포화토%강우%변파은정%안전계수%활동면
unsaturated soil%rainfall%slope stability%factor of safety%slip surface
文章基于饱和、非饱和渗流理论及强度折减法，分析了降雨入渗条件下非饱和土质边坡的稳定性，研究了4种降雨模式对边坡中饱和度、吸力、边坡安全系数及潜在滑动面位置的影响，定义了吸力降低深度，分析了吸力降低深度与边坡安全系数及滑动面位置的关系。算例分析表明：降雨量相同时，降雨模式对边坡安全系数及潜在滑动面位置的影响与土体的饱和渗透系数有关；当饱和渗透系数较大时，各种降雨模式的影响无明显区别；当饱和渗透系数较小时，长时间小强度降雨更易导致边坡的失稳；考虑参数的变异性时，力学参数变异性对边坡安全系数及滑面位置的影响较大；水力参数中，土水特征曲线拟合参数 a及n的变异性的影响较大。
文章基于飽和、非飽和滲流理論及彊度摺減法，分析瞭降雨入滲條件下非飽和土質邊坡的穩定性，研究瞭4種降雨模式對邊坡中飽和度、吸力、邊坡安全繫數及潛在滑動麵位置的影響，定義瞭吸力降低深度，分析瞭吸力降低深度與邊坡安全繫數及滑動麵位置的關繫。算例分析錶明：降雨量相同時，降雨模式對邊坡安全繫數及潛在滑動麵位置的影響與土體的飽和滲透繫數有關；噹飽和滲透繫數較大時，各種降雨模式的影響無明顯區彆；噹飽和滲透繫數較小時，長時間小彊度降雨更易導緻邊坡的失穩；攷慮參數的變異性時，力學參數變異性對邊坡安全繫數及滑麵位置的影響較大；水力參數中，土水特徵麯線擬閤參數 a及n的變異性的影響較大。
문장기우포화、비포화삼류이론급강도절감법，분석료강우입삼조건하비포화토질변파적은정성，연구료4충강우모식대변파중포화도、흡력、변파안전계수급잠재활동면위치적영향，정의료흡력강저심도，분석료흡력강저심도여변파안전계수급활동면위치적관계。산례분석표명：강우량상동시，강우모식대변파안전계수급잠재활동면위치적영향여토체적포화삼투계수유관；당포화삼투계수교대시，각충강우모식적영향무명현구별；당포화삼투계수교소시，장시간소강도강우경역도치변파적실은；고필삼수적변이성시，역학삼수변이성대변파안전계수급활면위치적영향교대；수력삼수중，토수특정곡선의합삼수 a급n적변이성적영향교대。
Based on saturated-unsaturated seepage theory and strength reduction method ,the stability of an un-saturated soil slope under rainfall infiltration is analyzed .Considering four rainfall modes with the same total rainfall ,the changing rules of the degree of saturation ,the suction with depth ,the value of factor of safety and the position of potential slip surface are studied .The depth of suction reduction(Ds) is defined ,and the correlation between the depth of suction reduction and the factor of safety and its corresponding slip surface are analyzed .The results of numerical example show that when the total rainfall is the same ,the influence of rainfall modes on the factor of safety and the corresponding potential slip surface depends on the permeability of unsaturated soil .If the saturated hydraulic conductivity is relatively large ,there is no evident difference be-tween the values of factor of safety and the positions of potential slip surfaces .But if the saturated hydraulic conductivity is relatively small ,the rainfall mode with a long-time weak rainfall is more dangerous than the rainfall mode with a short-time strong rainfall .When the variability of soil parameters is considered ,the in-fluence of the variability of mechanical parameters on the factor of safety and the position of slip surface is lar-ger than that of the hydraulic parameters .And among the four hydraulic parameters ,fitting parameters for soil-water characteristic curve a and n have larger effect on the factor of safety and the position of slip surface than parameters Sr and ks .
