基于物质点法和极限平衡法公路沿线弃渣场危险性评价

公路沿线弃渣场的失稳破坏,不仅容易造成其下方道路和河流的堵塞,而且严重威胁人民的生命和财产安全。快速、准确和批量地评价公路沿线弃渣场危险性就显得十分必要。通过对公路沿线弃渣场进行遥感图像识别、无人机拍摄、现场调查及试验,确定了6个弃渣场危险性影响因子,运用物质点法对实体弃渣场进行了多因素多水平的数值模拟,得出各因子对弃渣场稳定性的影响程度;然后基于极限平衡法,提出一种弃渣场危险性系数的评价方法,并在贵州道翁高速沿线弃渣场进行应用和验证。结果表明:弃渣场危险度系数的范围为安全区间(0,1)、不稳定区间1,5]和极其不稳定区间5,+∞];贵州道翁高速沿线弃渣场评价结果与现场实际情况符合较好,验证了评价方法的有效性,为我国已经修建的公路弃渣场的快速和批量评价提供参考依据。

Risk Evaluation of Landfills along Highway Based on Material Point Method and Limit Equilibrium Method

The instability and damage of the landfill along highway will not only cause the blocking of the road and river under it,but also seriously threaten the safety of people’s life and property.It is necessary to evaluate the risk of the landfill along highway rapidly,accurately and in batches.Six risk factors of the risk evaluation of landfill are determinedbased on the remote sensing image,UAV shooting,field investigation and test of the landfill along the highway.The multi-factor and multi-level numerical simulation of the landfill is carried out by using the material point method to obtain the influence degree of each factor on the stability of the landfill.Then,based on the limit equilibrium method,an evaluation method of the risk factor of the landfill is proposed.It is applied and verified in the landfill along the Dao-Weng highway in Guizhou Province.The results show that the three ranges of the risk evaluation coefficient of the landfillare safety interval(0,1),unstable interval1,5]and extremely unstable interval5,+∞].The evaluation results of the landfill along the Dao-Weng highway in Guizhou are in good agreement with the actual situation,which verifies the effectiveness of the evaluation method.It provides reference for the rapid and batch evaluation of the landfill along the highway that has been built in China.