Research On The Influence Of Surrounding Soil Disturbance Caused By Pipe Jacking

At present, the development and utilization of underground space is more and more get the attention of the people, the pipe jacking construction on the building of the urban underground pipeline, pipeline maintenance is widely in use. With underground engineering in the development of urban construction, the pipe jacking construction method showed the advantages of its own, like many across the railway, high-rise buildings, rivers, and metro lines, etc. Pipe jacking construction method inevitably cause deformation of soil around the decline or, accompanied by a series of problems will also produce, such as surface subsidence, fracture and subterranean cavitation, etc. In this paper, the pipe jacking construction combined with zhengzhou longhai road in zhongzhou road overpass water supply pipeline engineering change, impact on the soil disturbance caused by pipe jacking construction method conducted a series of research. The following main conclusions:1、According to the present situation of pipe jacking construction of pipe jacking construction on the surrounding soil disturbance, the cause of the disturbance mechanism of general rules and disturbance was further studied, and the range of the disturbance of soil partitions, finally, practical engineering monitoring data to modify the general empirical formula, used to guide the construction of the rapid advances in safety.2 、 Using ANSYS finite element simulation software for pipe jacking construction of 3-d numerical simulation of the soil will be assumed to the ideal elastic-plastic body, simulation analysis of the pipe jacking construction of soil displacement of each profile and cross section. From the front side pipe jacking construction excavation 5m range of soil mass under small disturbance, beyond the limits of 7.5m of basic is not affected by pipe jacking construction of soil; In a direction perpendicular to the pipe jacking axis, 4m beyond the scope of the under the influence of pipe jacking construction is very small, 6m beyond basic is not affected; Of the soil on the top of the pipe jacking pipe, settling down to some extent, the closer the distance from the pipeline, a larger settlement, in the pipe at the bottom of the soil, have different degrees of uplift, the nearer to the pipe is, the more serious the phenomenon of uplift.3、For different formation damage, under the condition of different buried depth and diameter of pipe jacking construction has carried on the three-dimensional finite element simulation, analyzed the different pipe jacking construction under the condition of the size of the scope of the disturbance of soil. To the pipe jacking construction of different stratum losses, the formation damage, the greater the disturbance on the surrounding soil, the greater the displacement of the soil around the pipe jacking is larger, but different stratum losses of pipe jacking construction from the excavation front 5m, deformation of basic coincidence for the same curve, under the influence of pipe jacking construction is small; For different buried depth of pipe jacking construction, due to the soil under the action of gravity, buried depth, the greater the deformation of the pipe jacking around is larger; For different pipe diameter of the pipe jacking construction, the greater the diameter of pipe jacking, the greater the disturbance of soil around the pipe jacking is, characterized by large deformation.4、To zhengzhou longhai road and zhongzhou avenue interchange water supply pipeline to move carries on the numerical simulation and monitoring data, this paper compares and analyzes verification to the disturbance of soil around the pipe jacking construction of general law, provide a reference for engineering design and construction of the same type.