| 赵立财.降雨条件下弃土场滑坡力学参数敏感性反演研究[J].地质与勘探,2023,59(3):627-636 |
| 降雨条件下弃土场滑坡力学参数敏感性反演研究 |
| Sensitivity inversion of landslide mechanical parameters in spoil ground under rainfall conditions |
| 投稿时间：2022-04-06 修订日期：2022-10-13 |
| DOI：10.12134/j.dzykt.2023.03.013 |
| 中文关键词: 影响因子 敏感性分析 参数反演 极端工况 降雨 |
| 英文关键词: influence factors, sensitivity analysis, parameter inversion, extreme conditions, rainfall |
| 基金项目:辽宁省“兴辽英才计划”青年拔尖人才资助项目(编号：XLYC2007146)与中铁十九局集团公司科技研究开发计划项目（编号：2021-B03）联合资助 |
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| 中文摘要: |
| 为了研究不同降雨工况下的滑坡稳定性机理及变形规律，以兰原弃土场滑坡为例，首先在GeoStudio中建立二维剖面模型，然后从内因和外因两个角度出发，选取了内摩擦角、黏聚力、降雨强度、渗透系数、降雨入渗补给系数、饱和体积含水率等6个影响因子作为研究对象，设计了25组正交试验并采用极差分析法对滑坡影响因子进行敏感性分析，并结合监测数据对内摩擦角、黏聚力和渗透系数进行参数反演；同时，结合当地多年降雨数据资料，对滑坡进行了3种极端降雨工况条件下的稳定性影响规律研究。研究表明：兰原弃土场滑坡6个影响因子的敏感性大小为：内摩擦角>黏聚力>降雨强度>渗透系数>降雨入渗补给系数>饱和体积含水率；经参数反演计算后，得出的参数值较室内试验组有了进一步的修正，使得滑坡变形趋势更加符合实际监测资料分析的结果，同时得出双日降雨对滑坡稳定性影响更大，更易导致滑坡失稳破坏。通过本文的研究，可在后期不同极端降雨条件下对其采取针对性的防治措施及稳定性判别，并可为同类滑坡的研究提供借鉴意义。 |
| 英文摘要: |
| In order to study the stability mechanism and deformation law of landslide under different rainfall conditions, taking the landslide in the Lanyuan spoil site as an example, a two-dimensional section model was firstly established in GeoStudio. From the perspectives of internal and external factors, the internal friction angle, cohesion, rainfall intensity, permeability coefficient, and rainfall infiltration recharge coefficient and saturated volumetric moisture content, the six influencing factors were selected as the research objects. 25 sets of orthogonal experiments were designed and the range analysis method was used to analyze the sensitivity of the landslide influencing factors. The monitoring data was combined to conduct the parameter deduction for the internal friction angle, cohesion and permeability coefficient. According to the local multi-year rainfall data, the landslide stability impact law was studied under three extreme rainfall conditions. The research shows that the sensitivity of the six influencing factors of the Lanyuan spoil field landslide is: internal friction angle > cohesion > rainfall intensity > permeability coefficient > rainfall infiltration recharge coefficient > saturated volumetric water content. After parameter deduction calculation, the obtained parameter values have been further corrected by comparing with the indoor test group, which makes the landslide deformation trend more in line with the results of the actual monitoring data analysis. At the same time, it is concluded that the two-day rainfall has a greater impact on the stability of the landslide and is more likely to lead to landslide instability and damage. Through the study of this paper, targeted prevention and control measures and stability discrimination can be taken under different extreme rainfall conditions in the later period, and it can provide reference for the research of similar landslides. |
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