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| The influence of large diameter parallel pipe jacking on surface subsidence |
| WU Jian, WANG Qiyan, CHEN Jianjun
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| Zhejiang Communications Construction Group Co., Ltd., Hangzhou 310051, Zhejiang, China |
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Abstract Based on a power pipe tunnel project in Xiasha, Hangzhou, 3D finite element software ABAQUS was used to conduct numerical simulation of parallel pipe jacking process, the effects of successive pipe jacking staggered distance and mud-water pressure on soil settlement were studied.The maximum settlement was located directly above the center line of parallel pipe jacking and deviates from the leading pipe. The settlement caused by the descending pipe was 1.5 times that of the leading pipe; when the mud pressure was close to the static earth pressure, the settlement was the smallest; with the increasing of the staggered distance between the leading pipe and the descending tube, the soil settlement generally decreased. Meanwhile, the soil settlement generated by jacking was about 2 times as much as that generated by separate jacking. After the cross distance exceeded 4.31 times of the outside diameter of the pipe joint, the settlement had little change.
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Received: 12 April 2021
Published: 20 December 2021
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