The investigation of ultra-long-distance concrete pipe stuck in quartz sandstone formation using numerical simulation
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ORIGINAL PAPER
The investigation of ultra-long-distance concrete pipe stuck in quartz sandstone formation using numerical simulation Chao Li 1 & Zuliang Zhong 1,2 & Xinrong Liu 1,2 & Zhiyun Deng 1 & Guannan He 1 Received: 4 May 2018 / Accepted: 30 October 2018 # Saudi Society for Geosciences 2018
Abstract During mountainous area construction by long-distance pipe jacking, the pipe stuck encountered. To reveal the cause of the pipe stuck, this paper investigates the pipe surface frictional resistance corresponding to different burial depths and surrounding rock parameters by ADINA finite element analysis. Parameter sensitivity analysis results show that the cohesion effect on the frictional resistance was small, the frictional resistance tended to decrease markedly with the increasing other rock mechanical parameters and the decreasing burial depth and friction coefficient of the pipes. After continuing to consider the prerequisite of simultaneously changing the elastic modulus, internal friction angle and burial depth conditions, a solution of the maximum number of pipes driven by a single intermediate jacking station (IJS) was reduced from 59 to 40 was proposed based on an integration of simulations with the field monitoring results. Finally, the pipe jacking project was successfully completed after adopting the improvement proposals. Keywords Long-distance pipe jacking . Pipe stuck . Finite element analysis . Parameter sensitivity analysis
Introduction Pipe jacking, a trenchless pipeline construction technology developed in recent years, has been widely used in various fields. Rock micro-shield pipe jacking is the sequential insertion of prefabricated segmental rings into
* Zuliang Zhong [email protected] Chao Li [email protected] Xinrong Liu [email protected] Zhiyun Deng [email protected] Guannan He [email protected] 1
Civil Engineering College of Chongqing University, No. 83 North Street, Shapingba District, Chongqing 400045, China
2
National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas (Chongqing), No. 83 North Street, Shapingba District, Chongqing 400045, China
a mountain with a jacking device that simultaneously performs rock excavation at the rear of the microshield device. For the sake of understanding, a single segmental ring is called a jacked pipe in this paper. Because pipe jacking construction is a very complicated, nonlinear mechanical process, the smoothness is closely related to multiple factors, such as the pipe jacking system model, engineering geological conditions, choice of lubricant and mechanical properties (Bergeson 2014). In pipe jacking projects, drag reduction measures should be taken, such as pipe wall exterior grouting lubrication and additional IJS installation to reduce friction between the pipe and surrounding rock and soil. To ensure normal jacking, the total jacking force must be higher than the maximum total frictional resistance that may appear in the pipe section, or the pipe will become stuck. Presently, the jacking force and fr
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