风化砂改良膨胀土路基施工关键问题探讨

Discussion on the Key Problem of Weathered Sand Modified Expansive Soil Subgrade Construction

以小溪塔至鸦鹊岭一级公路改建工程K24+700—k24+900段内风化砂改良膨胀土路基处理方案为例,根据沿线地下水位线的分布情况,对处于不同地下水位线的风化砂改良膨胀土路基提出了相应的施工处理方案,探讨风化砂改良膨胀土路基施工过程中路基基底强化处理和路基施工的方法,以及相应的施工工艺和控制要点。对该段路基进行了为期3个月的工后沉降观测,并对累计沉降进行了分析。通过观测,该段路基平均累计沉降为6.2mm,满足规范要求,证明风化砂改良膨胀土路基施工方案是可行的。

Based on the case of weathered sand modified expansive soil range from K24＋700 to K24-1-900 of Xiaoxita to Yaqueling first-class highway reconstruction project, weathered sand modified expansive soil roadbed construction scheme at different underground water level was proposed. Weathered sand modified expansive soil roadbed strengthening treatment and roadbed construction method and control spots were discussed. Subsidence settlement observation was conducted over a period of three months and the total settlement was analyzed. Through observa- tion, the average cumulative settlement of roadbed was 6.2 mm, which met the specification. Weathered sand modified expansive soil subgrade construction scheme was proved to be feasible.