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Physical Modelling of Pipejacking in Soft Rock with Study of Driving Force
There are more and more public domain underground contructions in the western foothill of Taiwan in recent years. Difficultied are frequently encountered due to poor understanding of the behavior of the soft rock, sedimentary rocks with very low strength, which is the main rock type distributed in this area. In order to maintain the environment quality, instead of conventional cut and cover excavation, it is more and more trenchless technology such as pipejacking shield tunneling applied in Taiwan. In this study, physical modeling is applied to study the bahavior of pipejacking in soft rock, as well as the influence of driving force. The ingredient material for the physical model is taken from rock stratum in Baoshan area. To make the artificial soft rock, this ingredient is mixed with gypsum and water before confined to the strength within the range of soft rock. Then the artificial soft rock block was excavated according to experimental simulation steps together with monitoring the stress distribution, displacement field, and driving force. The results were compared with those from numerical simulation (Chuang, 2005) performed by finite element method ABAQUS to understand in more details about the rock mass behavior through the perturbation of excavation. Besides, required driving forces were calculated according to soil mechanics theory and compared with those applied in physical modeling as well as a real pipejacking case.
|Appears in Collections:||土木工程學系所|
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