Internal erosion occurs when fine particles escape from the soil driven by seepage flow,which is considered to be the crucial factor causing the failure of earth structures filled with gravelly soil.The objective of t...Internal erosion occurs when fine particles escape from the soil driven by seepage flow,which is considered to be the crucial factor causing the failure of earth structures filled with gravelly soil.The objective of this paper is to suggest an appropriate method to assess internal erosion potential of gravelly soil.By analyzing the sensitivity of soil material to internal erosion,the variable(Dc15/df85)max and the content of coarse particles(Pc)are selected as the evaluation indexes(Dc15 and df85 are the diameters of 15%mass passing in the coarse component and 85%mass passing in the fine component,respectively).A series of gravelly soils with different particle size distributions are tested for internal erosion by the self-made permeameter.Based on the test results,an evaluation method for the internal erosion of gravelly soil is proposed.Gravelly soil is prone to internal erosion when 60%≤Pc<95%and(Dc15/df85)max≥9.5.The proposed method shows good accuracy in evaluating the internal erosion of 36 soil samples from other studies,which confirms the reliability of the method.The proposed method makes it possible to accurately assess internal erosion of gravelly soil,and an alternative method is provided for engineers to determine whether there is a risk of internal erosion in earth structures consisting of gravelly soil.展开更多
采用大型三轴试验剪切仪，对高速铁路路基粗粒土 B 组填料的剪胀特性进行试验研究。结果表明：围压和粗粒含量对粗粒土 B 组填料的剪胀性有显著影响，整体表现为粗粒含量低或围压高时剪缩，粗粒含量高且围压低时先剪缩后剪胀；当围压小...采用大型三轴试验剪切仪，对高速铁路路基粗粒土 B 组填料的剪胀特性进行试验研究。结果表明：围压和粗粒含量对粗粒土 B 组填料的剪胀性有显著影响，整体表现为粗粒含量低或围压高时剪缩，粗粒含量高且围压低时先剪缩后剪胀；当围压小于200 kPa，粗粒含量大于49．31％时，粗粒土 B 组填料存在明显的剪胀趋势，且围压越低、粗粒含量越高，剪胀时轴向应变越小。验证了轴向应变ε21与侧向应变ε3的二次函数对粗粒土 B 组填料的适应性，并在此基础上根据试验结果建立粗粒土 B 组填料关于粗粒含量、围压的剪胀判据方程。ROWE 剪胀方程能很好地反映粗粒土 B 组填料剪胀特性，参数K 可取7～12。展开更多
基金financially supported by the National Natural Science Foundation of China(Grant No.41790432)Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA20030301)。
文摘Internal erosion occurs when fine particles escape from the soil driven by seepage flow,which is considered to be the crucial factor causing the failure of earth structures filled with gravelly soil.The objective of this paper is to suggest an appropriate method to assess internal erosion potential of gravelly soil.By analyzing the sensitivity of soil material to internal erosion,the variable(Dc15/df85)max and the content of coarse particles(Pc)are selected as the evaluation indexes(Dc15 and df85 are the diameters of 15%mass passing in the coarse component and 85%mass passing in the fine component,respectively).A series of gravelly soils with different particle size distributions are tested for internal erosion by the self-made permeameter.Based on the test results,an evaluation method for the internal erosion of gravelly soil is proposed.Gravelly soil is prone to internal erosion when 60%≤Pc<95%and(Dc15/df85)max≥9.5.The proposed method shows good accuracy in evaluating the internal erosion of 36 soil samples from other studies,which confirms the reliability of the method.The proposed method makes it possible to accurately assess internal erosion of gravelly soil,and an alternative method is provided for engineers to determine whether there is a risk of internal erosion in earth structures consisting of gravelly soil.
文摘采用大型三轴试验剪切仪，对高速铁路路基粗粒土 B 组填料的剪胀特性进行试验研究。结果表明：围压和粗粒含量对粗粒土 B 组填料的剪胀性有显著影响，整体表现为粗粒含量低或围压高时剪缩，粗粒含量高且围压低时先剪缩后剪胀；当围压小于200 kPa，粗粒含量大于49．31％时，粗粒土 B 组填料存在明显的剪胀趋势，且围压越低、粗粒含量越高，剪胀时轴向应变越小。验证了轴向应变ε21与侧向应变ε3的二次函数对粗粒土 B 组填料的适应性，并在此基础上根据试验结果建立粗粒土 B 组填料关于粗粒含量、围压的剪胀判据方程。ROWE 剪胀方程能很好地反映粗粒土 B 组填料剪胀特性，参数K 可取7～12。
