Abstract
In the tunnel construction, due to the limitation of the survey and design and the complex dynamics of tunnel surrounding rock geological conditions, so it is difficult for complex geology with the microscopic accurate grasp, often which caused by geological exploration data do not tally with the actual situation, often encountered in karst water inrush, large deformation in weak rock, cave-in subsidence, geological hazards, such as gas outburst, rock burst cause person casualties, delays, in order to minimize geological disaster influence degree, advanced geological prediction before construction is very necessary. Using regression analysis, based on engineering vault subsidence and horizontal convergence has carried on the regression analysis, research results can be reference for related engineering design and construction. Detailed introduces the principle, methods and outstanding characteristic of tunnel reflection tomography advanced prediction system, and take Jianfengling mountain tunnel of Darui line railway as an example, the prediction results are analyzed in detailed processing, and on-site validation, finally points out the problem for further study the technology.
Highlights
A In tunnel construction, geological advanced prediction is to use a certain technology and method of tunnel rock massD to collect relevant data, and use the corresponding theory and the law to analyze these data, the research, the construc-E tion constraints in front of the rock mass condition or forecast hazard possibility
E does not accord with the actual situation occurred frequently, especially between the bad geological location accurate posi
May form of severe accidents in a timely manner to provide information, make the engineering unit construction preparation in advance; Constraints can be understand by forecast engineering geological conditions and short distance in front of the rock type, correct selection of excavation section for the construction unit, which provides the basis for supporting design parameters and construction methods
Summary
A In tunnel construction, geological advanced prediction is to use a certain technology and method of tunnel rock mass. Tunnel Reflection tomography technology (TRT) is the salient feature of the way of observation to achieve the three process of tunnel excavation in karst water inrush, large de- dimensional space observation, high degree of automation of formation in weak rock, landslides, subsidence, rock burst, machine, the software is simple to use and may not need gas outburst and other geological disasters, cause person explosive to generate the seismic signal, with a relatively casualties, delays, and cause huge economic losses, in order low cost, compared with other advanced prediction method to avoid and reduce the possible geological disaster in un- of TRT interface localization, the wave velocity of rock mass derground engineering construction, safety, high quality and and its classification and so on has the high accuracy and can fast construction of the tunnel, so advance geological detect the tunnel working face in front of different geological conditions, such as unusual rock mass and empty, and oblique tunnel fracture can reflect well, Especially for solving the problem of water, advanced prediction of broken rock structure, have very good effect in recent years, more and more used in the geological advanced prediction[8-14]
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