基于滑坡等速变形速率的临滑预报判据研究  

Critical sliding prediction criterion of landslide based on constant deformation rate

作　　者：王珣[1] 李刚 刘勇[1] 伏坤 

机构地区：[1]中国中铁二院工程集团有限责任公司,四川成都610031

出　　处：《岩土力学》2017年第12期3670-3679,共10页Rock and Soil Mechanics

基　　金：国家重点研发计划(No.2016YFC0802200);四川省科技支撑计划(No.2013GZ0147)~~

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。Based on the monitoring curves of landslide deformation, the early warning criteria are established separately by previous researchers according to the parameters such as the displacement rate, displacement tangent angle, and improved tangle angle. However, the uniformly fixed criterion is not sufficient for the early warning of the landslide, due to the significant differences in the characteristics of landslides. The applicable range of Time-time curve conversion was obtained by considering the improved tangential angle and the characteristic of creep strength. This study also analysed the developments of creep parameters during the constant velocity deformation stage, until reaching the constant or steady values by using the Nishihara model. The constant deformation rate can be regarded as a comprehensive external performance of the parameters in the creep process of the landslide. Moreover, it was inversely related to critical sliding tangential angle. The constant deformation rate and critical sliding tangential angle were obtained by dividing the stages and conversing Time-time curve of 16 typical graded landslides. There was a high correlation between them. By combing with the maximum tangential angle of the undisturbed landslide deformation process, the lower limit was used as the criterion of landslide warning to ensure the reliability of forecasting.

关 键 词：滑坡 等速变形速率 西原模型 临滑切线角 预报判据 

分 类 号：TU42[建筑科学—岩土工程]