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| INFLUENCE OF PIPELINE LEAKAGE RANGE ON GROUND DEFORMATION AND FAILURE DURING SHALLOW TUNNELLING |
| ZHANG Chengping，YUE Yuejing，CAI Yi |
| (Key Laboratory for Urban Underground Engineering of Ministry of Education，Beijing Jiaotong University，Beijing 100044，China) |
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Abstract Pipeline leakage is one of the important issues during shallow tunnelling in urban area. To determine the deformation patterns and the failure mechanisms of a shallow tunnel influenced by pipeline leakage is of great importance for the safety of the tunnel project. Plane strain model tests were performed to study the influence of the range of pipeline leakage on the deformation and failure of the surrounding rock of class VI during shallow tunnelling. It is found that notable ground surface settlement occurs due to the pipeline leakage before tunnel excavation. With the increase of the range of leakage，the magnitude and the range of the ground surface settlement also increases. However，when the pipeline leakage reaches the tunnel vault，the influence of the range of leakage on the ground surface settlement decreases significantly. There are several vertical cracks visible on the surface due to the pipeline leakage before tunnel excavation. With the increase of the ground surface settlement，the depth and width of the cracks increase simultaneously. However，the variation rates of the depth and width of the cracks with the ground surface settlement decreases after tunnel excavation. The larger the range of the pipeline leakage is，the more severe the failure of the surrounding rock after tunnel excavation. When the range of leakage is small，the shape of fracture plane of surrounding rock is scarcely influenced. However，when the range of leakage is large enough，the fracture plane is closely related to the boundary of the pipeline leakage and the fracture plane is steeper than that one without leakage.
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Received: 14 April 2014
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2015, Vol. 34 
