摘要
通过采用剪切试验获得含水率对煤系土黏聚力、抗剪强度的影响规律,揭露了煤系填方土层水敏感性对填方路基边坡稳定性的影响机理.研究结果表明,煤系土黏聚力及抗剪强度随含水率的增高而降低,当含水率高于某一值后,黏聚力和抗剪强度均骤减,煤系填方土层对水具有很强的敏感性.因而,在采用煤系土层的填方路基边坡设计中,应充分考虑煤系土水敏感性对其自身强度的影响,并重视截水、排水及防渗设计;应采用挖除填方土体,底部设置不易风化的碎石等透水材料并做好盲管的治理方案,保证填方边坡的稳定性,降低边坡治理造价,可为类似路基滑坡治理提供参考与借鉴.
Abstract
The influence of water content on cohesion and shear strength of coal measure soil samples was obtained through shear test,and then the influence mechanism of water sensitivity of coal measure soil layer on stability of embankment slope was revealed.The results show that the cohesion and shear strength of coal measure soil decrease with the increase of water content.When the water content is higher than a certain value,both cohesion and shear strength decrease sharply.Coal measures soil layer is very sensitive to water.Therefore,the influence of water content change on the strength of coal measure soil should be fully considered in the slope design of the filling subgrade of the underlying coal soil.And pay attention to water interception,drainage and seepage prevention design.The stability of the slope can be guaranteed and the cost can be reduced by adopting the treatment plan of excavating the filled soil,setting permeable materials such as unweathered gravel at the bottom and doing a good job of blind pipe.It can provide reference for similar subgrade landslide treatment.
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万方数据