Law Of Ground Surface Settlement In Shallow Tunnel By Excavation And Its Influence On Existing Buildings

It is predicted that a great deal of urban metro engineering will be constructed at early-middle period in the 21st century based on flourish metro engineering foreground nowadays, and at one time many geotechnical problems will also come forth. Large land subsidence value induced by metro tunneling can lead to that road surface, buried pipelines and buildings and so on are damaged. Furthermore, bad economic loss and social effect can be brought about. As a result, it is an urgent realistic problem that land subsidence induced by tunneling is forecasted and controlled so as to ensure the safety of close-by building and buried pipeline.As far as complicated geologic condition with weak watery strata, complex construction condition with multi-tunnel system and complex environmental condition with adjacent to building and pipeline are concerned, difficulty and risk of construction are very great and the mechanism of ground settlement and its distribution are also very complex. It is revealed by domestic and overseas data and literatures that research on it is poor, so theoretical study is very weak compared to flourish metro engineering. Relative study in this dissertation is carried out combined with Shen-zhen metro engineering and multi-research techniques are used, on the one hand, so as that results acquired are reliable and reasonable, on the other hand, they can be verified each other and learn from other's strong point offset one's weak point.Because results acquired in the dissertation by means of numerical simulation And test are basically consistent with The results by spot measuring, analysis theory and method concerned in the dissertation is reasonable, and prediction before construction is almost right is also proved. Thus theoretical basis and guidance are provided to real engineering, at the same time, a series of key techniques and problems are solved. Valuable design, construction and scientific research experience is accumulated and provided to similar engineering. Outstanding construction achievement by real engineering indicated that it is a necessary direction to increase scientific research expense of great and complicated engineering.