|
Title |
A Study on the Behavior of Concrete floors with Over-break in Railroad Tunnel
|
|
Authors |
양주경(Joo-Kyoung Yang) ; 김효정(Hyo-Jung Kim) |
|
DOI |
https://doi.org/10.11112/jksmi.2017.21.5.101 |
|
Keywords |
여굴 ; 철도터널 ; 터널 바닥콘크리트 소요두께 ; 채움콘크리트 Over-breack ; Railroad tunnel ; Floor concrete Thickness ; Filled concrete |
|
Abstract |
Over-break, which is excavated larger than planned line at tunnel excavation, is inevitable due to the nature of blasting. But regarding the bottom of the foundation, most of the domestic ordering organizations pay only 10 cm thick filled concrete when pouring concrete due to over-break. In accordance, the construction cost will increase greatly if all the depths of the designed over-break are filled only with concrete. When tunnel excavation occurs, concrete filling of 18 MPa(T = 100 mm) and 150 mm∼237 mm auxiliary concrete layer and 240 mm concrete track(TCL) are applied to the upper part. The concrete is installed in an excessive amount of about 600 mm between the lower part of the rail and the tunnel rock bed. Therefore, in this study, it is necessary to analyze the concrete crack structure according to the depth of the existing tunnel and the modified tunnel section, and to evaluate the adequacy of the required thickness of the tunnel floor concrete for securing the crack stability of the concrete.
|