襯砌剖面變形特徵曲線與微變監測技術應用於營運中隧道荷載變化之評估

Profile-deformational Characteristic Curve and Micro-displacement Monitoring Technology for Evaluating Loading Variation on Lining of Operating Tunnel

邱雅筑(Ya-Chu Chiu) ； 陳正勳(Cheng-Hsun Chen) ； 王泰典(Tai-Tien Wan) ； 鄭富書(Fu -Shu Jeng) ； 黃燦輝(Tsan-Hwei Huang)

《中國土木水利工程學刊》 24卷2期 (2012/06) Pp. 101-109

https://doi.org/10.6652/JoCICHE.201206_24(2).0001

摘要

襯砌異狀肇因的研判作業為營運中隧道安全評估的基礎，亦為確保隧道結構安全穩定所需維修補強的關鍵資訊。而隧道周圍的外力變化為各種影響隧道穩定的因素中至為關鍵的一項，且為補強設計之直接依據。本研究針對營運中隧道荷載變化評估提出新的觀念，首先基於運動學觀點分離隧道位移為剛體運動與變形兩大分量，探討隧道周圍不同外力變化造成的變形特性，建立襯砌剖面變形特徵曲線。繼而依據隧道變形機制與襯砌剖面變形特徵曲線的關係，結合差分全球定位系統與新型全測站之自動目標識別、照準及放樣功能，建立隧道襯砌位移微變監測技術，可高精度地測量隧道剖面3D絕對坐標，並可透過前、後期測量結果求得襯砌變形曲線，比對典型的襯砌剖面變形特徵曲線，從而掌握隧道周圍外力變化之趨勢。經案例應用結果顯示，本研究所提方法論可有效推測隧道剖面變形的機制，有助於量化的隧道安全檢測資訊。

關鍵字

隧道 ； 安全檢測 ； 安全評估 ； 襯砌剖面變形特徵曲線 ； 微變監測

並列摘要

Diagnosis of the potential causes for lining anomalies is a fundamental issue for safety evaluation of an operating tunnel, and is also essential information for the design of repairing and reinforcing measures, if necessary. Among numerous factors affecting the stability of an operating tunnel, the variation of loads applying on lining structure is of concerned, which is the direct datum for reinforcing design. Based on the viewpoint of kinematics, this study divides the displacement of a tunnel lining in to two major components, i.e. the rigid body motion component and the deformation component. The deformation component along the profile of a specific lining section under distinct loading variation is then studied and summarized into some specific patterns, i.e. the profile-deformation characteristic curve. A new survey-based monitoring technology aimed to grasp the micro displacement of operating tunnels is developed through integrating the differential global positioning system for high-accurate traverse and the automatic target recognition and set out function of modern geodetic device for profile measurement. The profile deformation curve of a specific lining section is then available by comparison the successive survey results. Comparing the profile deformation curve with the typical profile-deformation characteristic curve, the variation of loads applying on lining structure of the tunnel is then accessible. Application to a practical inspection case shows that the proposed method can infer the deformation mechanism of the lining structure, which is useful for quantifying inspection data for the tunnel and good for subsequent safety evaluation

並列關鍵字

tunnel ； safety inspection ； safety evaluation ； profile-deformation characteristic curve ； micro-displacement monitoring technology