他白依隧道洞顶不稳定斜坡体变形研究

Study on Deformation of Unstable Slope at the Top of Tabaiyi Tunnel

他白依隧道在穿越洞顶不稳定斜坡体时地表出现了裂缝.阐述了采用对监测资料进行分析、计算、数值模拟等手段,结合对不稳定斜坡体在隧道开挖、地下水位动态变化、各种工况下不稳定斜坡体物理力学性质影响进行分析的基础上,综合分析了不稳定斜坡体变形破坏的模式并建立了堆积体变形模型与监测网,布置了各类监测设备(钻孔测斜仪、对斜坡变形失稳进行预报预警等),结合模型,定量计算了不稳定斜坡体的稳定性及安全系数,根据计算得到的安全系数及破坏模式,有针对性地提出了工程防治措施建议.

When the tunnel passes through the unstable slope at the top of the tunnel,cracks appear on the surface of the ground.Based on the analysis,calculation and numerical simulation of monitoring data,combined with the analysis of the influence of tunnel excavation,dynamic change of groundwater level and physical and mechanical properties of unstable slope under various working conditions,the deformation failure mode of unstable slope is comprehensively analyzed,and the deformation model and monitoring network of accumulation body are established,and various monitoring equipment(borehole inclinometer,prediction and warning of slope deformation and instability,etc.)are arranged.Combined with the model,the stability and safety factor of unstable slope are calculated quantitatively.According to the calculated safety factor and failure mode,the engineering prevention and control measures are proposed.