Abstract
Urban underground pipelines undertake many tasks closely related to people’s daily life and production, such as water supply, drainage, gas supply, and power supply. Metro projects are usually located in areas with dense underground pipelines; therefore, in the construction process of deep-foundation metro pit, some measures should be taken to protect the safety of underground pipelines. Under the engineering background of the Jiangbei foundation pit of the Wuhan Yangtze River Tunnel, the influence of soil disturbance caused by deep-foundation pit excavation is first simulated using the ABAQUS software on the displacement of underground pipelines and the dangerous area of underground pipelines is analyzed. Second, the most disadvantageous combination is analyzed for the risk factors of pipelines under the influences of multiple risk factors. Finally, a systematic additional partial reinforcement scheme (APRS) is proposed from the aspects of safety and economy to protect the safety of underground pipelines in the dangerous areas with greater risk. The results of measurement prove that the APRS is effective for pipeline protection and can provide reference for similar problems.
Highlights
In order to alleviate the increasing urban traffic volumes, underground space presents a viable solution for rapid development of China’s metropolitan areas in the past 10 years
Excavation-induced ground movements cause pipeline deformation that may disrupt the conveyance of important services and resources and threaten the safety and security of urban inhabitants. erefore, the study on the influence of deep pit excavation to the adjacent pipeline is a meaningful issue in geotechnical environment engineering
Peck [1] initiated a number of similar semiempirical studies on deformation associated with deep excavations conducted by many researchers (Burland et al [2]; Mana and Clough [3]; Clough and O’Rourke [4]; Ou et al [5]; Wong and Patron [6]; Carder [7]; Fernie and Suckling [8]; Wong et al [9]; Hsieh and Ou [10]; Long [11]; Yoo [12]; Moormann [13]; Leung and Ng [14]; and Wang et al [15]) in the following more than 30 years
Summary
In order to alleviate the increasing urban traffic volumes, underground space presents a viable solution for rapid development of China’s metropolitan areas in the past 10 years. Deep pit excavation has a great influence on the adjacent pipeline, and there are numbers of studies concerned about the interaction mechanism between the pipeline and soil (e.g., Dutta et al [43], He et al [44], Balkaya et al [45], and Mahdavi et al [46]), but there is a lack of study putting forward a systematic, economic, and effective reinforcement scheme to protect pipeline. Is paper is based on Jiangbei Pit of Wuhan Yangtze River Tunnel (JPWYRT) and analyses the existing pipeline risk induced by deep pit excavation of metro construction as follows: First, a finite-element model is constructed in this paper to analyze the dangerous areas where underground pipelines are exposed to hazards caused by the disturbed soil surrounding the foundation pit. E movement regularity of soil adjacent to underground continuous wall (UCW) can be expressed as follows (Hsieh and Ou [10]): Surface uv,max
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