摘要
隧道软弱围岩特有的工程力学性质以及所处的地质环境是造成大变形灾害的主要因素,严重影响工程进度。从武当群片岩的地质构造环境、物理特性、水理特性等方面分析该类软岩劣化及破坏机理。分析结果显示:软岩的变形破坏是地层岩性、结构偏压、地下水、构造应力等因素随时间交互作用的结果,具有明显的时间效应。在此基础上,选取典型断面的围岩变形监测数据,利用R/S分析法判断各时间序列的变形趋势。Hurst指数计算结果显示典型断面各变形时间序列均呈显著增长趋势,且长期记忆较好,表明大变形现象仍有继续发展趋势,须及时对大变形段采取有效措施。
Specific engineering mechanics properties and geological environment of tunnel soft surrounding rock is the main factor causing large deformation disaster,which could seriously affect the project progress. T his paper analyzed the deterioration and failure mechanism of W udang group schist from such aspects as geological tectonic environment,physical characteristics and water physical properties. T he analysis results showed that soft rock deformation and destruction is the result of some factors including formation lithology,structural bias,ground water and tectonic stress interacting with time,which has obvious time effect. Based on the results,this paper selected the surrounding rock deformation monitoring data of typical section and deduced the deformation tendency of each time series with R/S analysis method. Hurst exponent calculation results showed that each deformation time series of typical section has a significant increasing trend and good long time memory,which indicates that large deformation phenomenon has a continuous development trend and effective measures should be taken on large deformation sectio n .
出处
《铁道建筑》
北大核心
2014年第11期56-60,共5页
Railway Engineering
关键词
隧道
软岩
大变形
R/S分析法
时间序列
T unnel
Soft rock
Large-deformation
R/S analysis method
T ime series
