ISSN 1003-8035 CN 11-2852/P
    陈浩,吴红刚,谌清. 基于“D”型深孔测斜曲线的滑坡滑动面位置确定方法研究[J]. 中国地质灾害与防治学报,2024,35(4): 93-105. DOI: 10.16031/j.cnki.issn.1003-8035.202210031
    引用本文: 陈浩,吴红刚,谌清. 基于“D”型深孔测斜曲线的滑坡滑动面位置确定方法研究[J]. 中国地质灾害与防治学报,2024,35(4): 93-105. DOI: 10.16031/j.cnki.issn.1003-8035.202210031
    CHEN Hao,WU Honggang,CHEN Qing. Study on the method for determining the position of landslide slip surface based on “D” type inclinometer curve[J]. The Chinese Journal of Geological Hazard and Control,2024,35(4): 93-105. DOI: 10.16031/j.cnki.issn.1003-8035.202210031
    Citation: CHEN Hao,WU Honggang,CHEN Qing. Study on the method for determining the position of landslide slip surface based on “D” type inclinometer curve[J]. The Chinese Journal of Geological Hazard and Control,2024,35(4): 93-105. DOI: 10.16031/j.cnki.issn.1003-8035.202210031

    基于“D”型深孔测斜曲线的滑坡滑动面位置确定方法研究

    Study on the method for determining the position of landslide slip surface based on “D” type inclinometer curve

    • 摘要: 在实际的深孔位移监测中,测斜曲线的突变特征是滑动面辨识的关键依据,前人通过大量的研究总结将滑动面迹象显著的测斜曲线类型分为了“B”型、“D”型、“r”型等几种。其中,对于“D”型测斜曲线通常是将曲线的鼓包凸起点作为滑动面的位置,但这种方法容易受到测点布置间隔和横纵坐标观测尺度的影响,存在滑面位置定义不清晰、数值不确定的问题。为了能够有效地克服这些缺点,提升测斜曲线滑动面辨识的准确度,基于“D”型测斜曲线变化特征,将滑坡抽象为由“滑动体”“滑动区间”以及“不动体”三者组成的概化模型,根据三者抗弯刚度的差异建立外界荷载作用下的杆件力学模型,深入分析滑坡运动过程中不同深度处土体的变形特点。研究表明,由于“D”型曲线滑动面并未完全贯通,使得土体沿深度方向变形连续无突变,力学模型中杆件正负弯矩的分界点是变形曲线水平位移最大处,能够真实地反映滑坡变形特点以及滑动面的位置。将土体累计位移转化为相对位移,则“D”型深孔测斜曲线变为了“S”型相对位移-深度曲线,且“S”型曲线的拐点与滑动面的位置相近;通过提取监测期内不同深度处土体的平均相对位移,运用三次样条插值法计算“S”型区段内拐点的深度值,能够更加精准地确定滑动面位置,更好地提升深孔位移监测的可靠度和准确度,具有较大的实用价值。

       

      Abstract: In borehole monitoring for deep displacement, the abrupt characteristics of inclinometer curves are the key basis for identifying the sliding surface. Previous studies have summarized several types of inclinometer curve patterns that exhibit significant sliding surface signals, including “B” “D”and “r” types. For “D” type inclinometer curves, the convex point of the curve is typically used as the position of the sliding surface. However, this method is susceptible to the influence of observation points spacing and coordinate observation scales, which can result in an unclear definition of the sliding surface position and uncertain numerical values. To overcome these drawbacks and improve the accuracy of sliding surface identification in inclinometer curves, a generalized model of landslides composed of “sliding body” “sliding interval” and “immovable body” was developed based on the variation characteristics of the “D” type inclinometer curve. A mechanical strut model subjected to external loads was established based on the different flexural rigidity of the three members, and the deformation characteristics of soil at different depths during landslide movement were analyzed in depth. The study found that the sliding surface of “D” curve does not entirely penetrate, leading to continuous soil deformation along the depth direction without abrupt change. The demarcation point of the positive and negative bending moments in the mechanical model is a location where the horizontal displacement of deformation curve is the largest, which can reflect the real deformation characteristics of the landslide and the position of the sliding surface. By converted the accumulated soil displacement into relative displacement, the “D” type inclinometer curve is transformed into “S” type relative displacement-depth curve, and the inflection point of the “S” type curve is close to the position of the sliding surface. By extracting the average relative displacement of soil at different depths during the monitoring period and calculating the depth value of the inflection point in the “S” type segment by using the cubic spline interpolation method, the position of the sliding surface can be determined more accurately, which can greatly improve the reliability and accuracy of deep displacement monitoring and has significant practical value.

       

    /

    返回文章
    返回