Abstract
In order to evaluate the influence of pipe jacking construction process on ground subsidence and surrounding buildings, the numerical simulation of the construction process was carried out by FLAC3D, and the failure approach index (FAI) of the rock and soil around the pipeline was calculated to describe quantitatively their risk and damage state. The numerical results show that the final settlements of the buildings around the pipeline are less than the buildings' safety control values. The rock or soil mass within 0.8 times of the pipe diameter are in the excavation damage zone and disturbance zone (0.8≤FAI≤1.3), while outside 0.8 times of the pipe diameter are basically undisturbed (FAI≤0.8).
Highlights
Pipe jacking has become popular in the USA during 1950s[1]
Many scholars have done plenty of researches on the basic rules of the stratum structure disturbance and ground settlement caused by pipe jacking constructions[3~12], but the complex environment and specific engineering requirements are still needed to be considered in detail
Construction process in a complex environment can be simulated according to engineering practice
Summary
Pipe jacking has become popular in the USA during 1950s[1]. As a trenchless technology, pipe jacking is widely used in modern municipal pipe networks. There is inevitable disturbance to stratum structure, especially when the environment is very complex, inhomogeneous ground settlement and uneven deformation and crack of ground buildings in the course of pipe jacking construction. Many scholars have done plenty of researches on the basic rules of the stratum structure disturbance and ground settlement caused by pipe jacking constructions[3~12], but the complex environment and specific engineering requirements are still needed to be considered in detail. The dangerous level and damage degree cannot be reflected accurately by plastic zone. FAI is capable of providing scientific basis to the evaluation of stability of soil or rock impacted by geotechnical engineering construction. For analyzing the influence of pipe jacking on surroundings more accurately, FLAC3D is used to simulate a pipe jacking construction process. Combining with the site monitoring data, the influence of pipe jacking on surrounding constructions are revealed clearly
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