黄河放淤固堤工程淤背体排水固结规律分析

Analysis of the Drainage Consolidation Law on the Project of Reinforcing the Yellow River Dike by Desilting

采用解析解分析了淤背体在施工完成前后淤背土体固结规律,探讨了淤土速率、淤区土的特性,特别是固结系数、排水边界条件对固结影响。结果表明:设置水平排水层后可以加速固结;相同淤土条件,淤土施工速率对固结度影响较大,当施工速率大于等于1.6 m/月后,施工速率对固结度的影响更明显;相同的施工速率下,固结度随着固结系数的增大而增大,当固结系数为10-6cm2/s量级时,施工速率对固结系数影响较明显;而为10-5cm2/s或10-7cm2/s量级时,施工速率对固结度影响不大。

The law of silt body consolidation before and after the completion of the construction is analyzed by theoretical solution. The effect of the speed of silt soil construction, the characteristics of the silt soil, especially the coefficient of consolidation and drainage boundary conditions to consolidation is explored. The results show setting level drainage layers can accelerate the consolidation. Construction rate of dike has a great impact on the degree of consolidation for the same soil conditions, especially has a greater impact on the degree of consolidation when the construction rate is greater than 1.6meter per month. The degree of consolidation increases with the increasing of the coefficient of consolidation for the same rate of construction. The impact of the construction rate on the coefficient of consolidation is more apparent when the coefficient of consolidation is 10 -6 cm2/s order of magnitude. When the co- efficient of consolidation is equal to 10-5 cm2/s or 10-7 cm2/s order of magnitude, impact of the construction rate on the consolidation degree is less.