| The countries' expressway construction has entered a golden age along with the development of infrastructure construction. The problem of tunnel stability has come in the train of it. The tunnel stability has directed relate to engineering cost, construction period, safety and so on. Especially the problem of soft rock tunnel stability is an unavoidable problem. It's also an important problem to be resolved currently.This article based on the program of mayazi tunnel from Wudu to Guanzigou.To understand the physical mechanics characteristics in weak rock and provide theoretical support for further research on the deformation characteristics and influence factors of it through research of weak rock mechanical characteristic and engineering properties of the mayazi tunnel. Grasp the actual change process of surrounding rock and looking for potential variation of it through the measured data of the scene. And judge the stability of surrounding rocks through the best fitting calculation formula by regression analysis.The stability of surrounding rock has many influence factors. This article's study from the tunnel construction process emphatically. Mainly from the tunnel's preparatory work--their forecast, geological investigation, the method of tunnel excavation,the control of blasting technology and the supporting method to control. Also note the each link of construction more closely.Made the following main achievements:(1)Understand of the engineering geological characteristics in weak rock profound through in theory.(2)Understand the changes and laws in weak rock characteristics to guide the construction in practice.(3) To control each link from construction process and reduce geological disasters may occur in the construction and the unnecessary losses.(4)Attention to the control, so as to ensure the every link closely of the construction and completes organization and management of the construction. |
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