中南大学学报（自然科学版）2012，Vol.43Issue(11)：4477-4483,7.
蓄洪区路堤边坡浸润线及安全系数变化规律
Variation of phreatic line and factor of safety of embankment located in flood storage areas
摘要
Abstract
Based on the fact that road embankment located in flood storage district will emerge in flood period, the unsaturated soil seepage theory was introduced to analyze pore water pressure distribution in embankment, and the phreatic line was determined when pore water pressure is 0 kPa. Water pressure on side of soil slice was applied to determine the seepage force equivalently. The embankment in slowly drawdown condition was analyzed by this method. Then, the whole flood storage period was considered composing of water level rising time, water level keeping time and water level lowering time, when the maximun water level was 10 m, water level rising rate was 0.2 m/d, water level lowering rate was 0.5 m/d, and then the variation of factor of safety of embankment, whose permeability coefficient was 10-6, 10-7, and 10-8m/s respectively, were studied. The results show that the phreatic line will not reach final level in flood storage period, and the smaller the permeability, the less change of the line. In water level rising time, factor of safety will be enlarged, and the rate is smaller when the soil of the embankment has larger permeability. In flood storage time, in the same s(s=t/T), the factor of safety of embankment decreases at higher rate when it is of larger permeability; in water level lowering time, the longer the storage time, the smaller the factor of safety, while lowering rate of factor of safety is not influenced by flood storage time.关键词
边坡工程/蓄洪期/非饱和渗流/蓄洪时长/安全系数Key words
slope engineering/ flood storage period/ unsaturated seepage/ flood storage time/ factor of safety分类
交通工程引用本文复制引用
贺炜,严志伟,付宏渊..蓄洪区路堤边坡浸润线及安全系数变化规律[J].中南大学学报（自然科学版）,2012,43(11):4477-4483,7.基金项目
国家自然科学基金资助项目(50908024) （50908024）
长沙理工大学公路工程省部共建教育部重点实验室开放基金资助项目(KFJ110106) （KFJ110106）
