Abstract
When tunnel construction develops to surrounding mountainous areas, tunnel portal presents the topographic characteristics of “high, steep, and slant” and geological characteristics of kinds of hugely thick colluvial or residual slope, and the health condition of the deformable body on front slope beside tunnel portal has a great influence on tunnel construction and operation. Tunnel portal has suffered from many disasters, and it is urgent to study and solve the engineering problem on how to diagnose the health condition of front slope beside tunnel portal quickly and accurately. Based on the tunnel of Jianquan village, this paper uses PS-INSAR technique for the first time to analyze and diagnose the health condition of the deformable body on front slope beside mountain tunnel portal at the construction stage and operation stage, so as to provide early warnings to unstable deformable body at tunnel portal and provide strong bases for the treatment of unstable deformable body. Therefore, PS-INSAR technique promotes the health monitoring method for deformable body on front slope beside mountain tunnel portal to a higher level.
Highlights
Geological problems of tunnel portal primarily include weak foundation of tunnel portal, severe bias of tunnel portal, hugely thick overburden of tunnel portal, and instability of front slope beside tunnel portal [1]
Most side slopes of highways locate in remote mountains and canyons, employees have large fluidity and uneven professional quality, and they are prone to have strong thinking inertia and fluky mind. eir safety awareness is weak, and the accuracy and timeliness of monitoring data cannot be guaranteed due to measurement difficulty and serious influence of human factors [7]. e second type is adopting traditional surface deformation monitoring means such as GPS which have high precision, but they have low spatial density and cannot provide surface deformation information of the whole area [8, 9]
INSAR technique is in wide application stage of business, such as surface settlement observation and analysis of the southwest of Tianjin based on PS-INSAR technique, landslide seismic damage observation and analysis of Zhangmu Port of Tibet based on INSAR technique, geological disaster monitoring based on applying INSAR technique in Beidou satellite [11], and the application of INSAR technique in research of Mathematical Problems in Engineering western coal mine goaf of Guizhou [12]
Summary
Geological problems of tunnel portal primarily include weak foundation of tunnel portal, severe bias of tunnel portal, hugely thick overburden of tunnel portal, and instability of front slope beside tunnel portal [1]. Taking Taoping tunnel of Houyue line as an example, INSAR technique was adopted for surface deformation monitoring investigation research of deep coal mine goaf in railway tunnel damage [16]. Research studies primarily applied INSAR technique in the deformation monitoring of railway tunnel site [17], but as a millimeter level technique having higher reliability than traditional INSAR technique, PS-INSAR technique has not been applied in health diagnosis of the deformable body on front slope beside mountain tunnel portal [18, 19]. Based on the tunnel of Jianquan village, this paper uses PS-INSAR technique for the first time to analyze and diagnose the health condition of the deformable body on front slope beside mountain tunnel portal [20, 21]. Based on the tunnel of Jianquan village, this paper uses PS-INSAR technique for the first time to analyze and diagnose the health condition of the deformable body on front slope beside mountain tunnel portal [20, 21]. rough the inversion and long-term dynamic tracking of historical deformation of the deformable body on front slope beside tunnel portal, understanding and awareness of the slope deformation law in monitoring area are improved [22], providing a more scientific basis and reference for the early warning and treatment of the deformation of the deformable body on front slope beside tunnel portal
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