Model Test Study on the Influence of Tunnel Construction on Existing Pipeline Under the Condition of Pipeline Leakage
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ORIGINAL PAPER
Model Test Study on the Influence of Tunnel Construction on Existing Pipeline Under the Condition of Pipeline Leakage Hai-tao Wang1,2 • Wei Liu2 • Hao-yu Sun2 • Xin-xin Zhuang2
Received: 9 April 2019 / Accepted: 12 December 2019 Ó Indian Geotechnical Society 2019
Abstract An indoor model test was carried out to study the influence of tunnel construction on the existing pipelines in the case of water leakage. The results showed that when the tunnel depth was deep, the pipeline was simultaneously deformed with the soil. However, when the tunnel depth was shallow, the separation of the pipeline and soil become more obvious with the increase in leakage scale. As the ground depth increased, the ground settlement above the pipeline increased first and then decreased. As the leakage scale enlarged, the position of the maximum ground settlement gradually moved downward, and the range was within 1.5–2.5 times of the pipeline diameter from the top of the pipeline. Under the condition of the no water leakage, the pipeline displacement was less than the surface settlement; therefore, it is safe to replace the pipeline displacement with surface settlement for analysis, while under the condition of the water leakage, the situation was opposite, and it is dangerous to replace the pipeline displacement with surface settlement. Based on the test results, the relation between pipeline displacement and surface settlement was established. Keywords Pipeline leakage Model test Pipeline displacement Pipeline–soil interaction
& Hai-tao Wang [email protected] 1
Research Center of Tunneling and Underground Engineering, Beijing Jiaotong University, Beijing 100044, China
2
School of Civil Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China
Introduction Most of the urban ground collapse accidents are caused by pipeline leakage [1, 2]. On the one hand, the drainage pipelines are non-pressure pipelines, and the resistance to deformation is poor. In particular, the pipelines laid in earlier years are severely corroded and the leakage is very common. On the other hand, although the quality of water supply pipelines is better than that of drainage pipelines, water supply pipelines are pressurized pipeline, and the inside water pressure influences the bearing capacity of pipelines. Moreover, in low-pressure pipeline network systems, leakage at pipeline joints is common. It is concluded that the initial pipeline leakage is a ubiquitous phenomenon in the water supply and drainage network. Pipeline leakage seriously weakens the soil around the pipeline, and the stability and bearing capacity of soil are significantly reduced. When tunnel construction is carried out under the leaking water pipeline, the disturbance will aggravate pipeline leakage, and the surrounding soil is further weakened. The water continuously leaks until the pipeline is ruptured or the soil around the pipeline is saturated, which contributes to the ground collapse. The ground collapse caused by pipeline leakage during the tunnel const
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