The method for determining the position of sliding surface of landslide with “r”type inclinometer curve
CHEN Hao1，2，WU Honggang1
(1. Northwest Research Institute Co. Ltd. of CREC，Lanzhou，Gansu 730070，China；2. College of Civil Engineering，Lanzhou University of Technology，Lanzhou，Gansu 730070，China)
Abstract：In the actual deep displacement monitoring，the“r”type inclinometer curve usually takes the maximum displacement mutation point as the position of the sliding surface. However，this method is easily affected by the sensor spacing and the observation scale of the coordinates，and there are problems such as unclear definition of the sliding surface position and numerical uncertainty. In order to overcome these shortcomings and improve the accuracy of slip surface identification，this paper divides the landslide into three parts：sliding body，sliding interval and inactive body，and proposes the theoretical generalization model of landslide with the characteristics of the curve based on the characteristics of the“r”type inclinometer curve. This paper analyzes the characteristics and laws of displacement rate of soil at different depths in the process of landslide movement. It is found that the sliding surface will cause the mutation of displacement rate at this position to form two groups of curve clusters which correspond to sliding body and inactive body respectively. The displacement rate has a step stage along the depth direction，which can accurately distinguish the range between the sliding body and the inactive body，and is conducive to identifying the position of the sliding surface. Further，this paper summarizes the distribution types of discrete points in the step stage，and constructs different mathematical calculation methods. This method can accurately determine the position of sliding surface and improve the reliability and accuracy of deep displacement monitoring，which has great practical value.
陈 浩1，2，吴红刚1. “r”型测斜曲线滑坡滑动面位置确定方法研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3567-3577.
CHEN Hao1，2，WU Honggang1. The method for determining the position of sliding surface of landslide with “r”type inclinometer curve. , 2023, 42(S1): 3567-3577.
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2023, Vol. 42 
