基于滑坡等速变形速率的临滑预报判据研究

发布时间：2018-06-11 20:48

本文选题：滑坡 + 等速变形速率　；参考：《岩土力学》2017年12期

【摘要】：前人根据滑坡的变形监测曲线,分别提出了以位移速率、位移切线角、改进切线角等参数作为滑坡预警判据的方法,但因滑坡个性特征差异明显,采用统一固定判据是不充分的。在改进切线角和岩土体材料蠕变强度特征点的基础上,提出了T-t曲线转换的适用范围。以西原模型为基础,研究了蠕变参数在等速变形阶段发展至恒定值或稳定值,等速变形速率可看作滑坡蠕变过程中各参数的综合外在表现,与临滑切线角存在相关性,并呈反比关系。通过对16个典型蠕变滑坡进行阶段划分和T-t曲线转换,获得滑坡等速变形速率和临滑切线角,并建立两者之间关系,相关系数较高,同时结合未破坏滑坡变形过程的最大切线角,以下限作为滑坡预警判据,保证了预测预报的可靠度。
[Abstract]:According to the deformation monitoring curve of landslide, the methods of using displacement rate, displacement tangent angle and improved tangent angle as early warning criterion of landslide are put forward respectively, but the characteristics of landslide are different obviously. It is not sufficient to adopt unified fixed criterion. On the basis of improving tangent angle and creep strength characteristic point of rock and soil material, the application range of T-t curve transformation is proposed. On the basis of the original model, the creep parameters developed to a constant or stable value in the isokinetic deformation stage are studied. The isokinetic deformation rate can be regarded as a comprehensive external representation of the parameters in the creep process of a landslide, and there is a correlation between the creep parameters and the angle of the impending slip tangent. The relationship is inversely proportional. By dividing 16 typical creep landslides into stages and converting T-t curves, the isokinetic deformation rate and tangent angle of the landslide are obtained, and the relationship between them is established, and the correlation coefficient is high. Combined with the maximum tangent angle of the undamaged landslide deformation process, the following limit is used as the early warning criterion of the landslide, which ensures the reliability of the prediction and prediction.
【作者单位】：中国中铁二院工程集团有限责任公司;
【基金】：国家重点研发计划(No.2016YFC0802200) 四川省科技支撑计划(No.2013GZ0147)~~
【分类号】：P642.22;TU43

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