中国地质灾害与防治学报2024，Vol.35Issue(4)：93-105,13.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
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.关键词
测斜曲线/滑动面位置/相对位移/滑坡/三次样条插值法Key words
inclinometer curve/sliding surface position/relative displacement/landslide/cubic spline interpolation分类
天文与地球科学引用本文复制引用
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):93-105,13.基金项目
国家重点研发计划(2018YFC1504903) （2018YFC1504903）
青海省重点研发与转化计划(科技成果转化专项2022-SF-158) （科技成果转化专项2022-SF-158）
中国中铁股份有限公司科技研究开发计划(2022-重大专项-07) （2022-重大专项-07）
甘肃省技术创新引导计划-企业研发机构能力建设专项资助(23CXJA0011) （23CXJA0011）
