某拟建高速公路膨胀土判定关键指标分析及治理措施研究

采用多指标的方法对某拟建高速公路膨胀土进行判别,通过统计分析比较,确定自由膨胀率为划分膨胀强弱类别的关键指标,并参照不同的地貌单元,对沿线膨胀土路段进行划分;在此基础上,进一步研究膨胀土的大气影响深度和不同深度范围内的膨胀强弱变化规律,并根据构筑物设置情况,对不同类别的膨胀土,分别提出相应的治理措施。

Study on Key Index for Identification of Expansive Soil along a Highway to be Built and the Countermeasures

Multi-index method was used to identify the expansive soil along a highway to be built and, through statistical analysis and comparison, determine free swelling ratio to be the key index to classify the expansion degree; then by referring to different geomorphic units, this highway was sectioned, based on which the atmosphere influence depth therewith and the change rules of expansion degree within different range of depth were further studied. Next, depending on setting of the structures, the control measures corresponding to each class of expansive soil were suggested respectively.