公路隧道围岩分类（Classification of surrounding rock of highway tunnel）.docVIP

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公路隧道围岩分类（Classification of surrounding rock of highway tunnel）.doc

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公路隧道围岩分类（Classification of surrounding rock of highway tunnel）

公路隧道围岩分类（Classification of surrounding rock of highway tunnel） Classification of surrounding rock of highway tunnel 1 introduction the road tunnel is an engineering structure across the mountain. It is closely related to the surrounding rock and soil (generally referred to as the surrounding rock) and interacts and interacts with each other. Different surrounding rocks will have different geological phenomena when they construct a tunnel. For example, when some surrounding rock is excavated, the tunnel does not collapse and can remain stable very well. And in some rock tunnel after tunnel excavation, not stable, easy to collapse, need excavation space must be built to support lining, these cases illustrate the tunnel excavation in different surrounding rock, the surrounding rock will show different stability. In order to meet the requirements of engineering design and construction, such as blasting, support, excavation, preparation of quotas and so on, the geological conditions corresponding to these different requirements are classified, which is the classification of surrounding rock. For the design of road tunnel engineering, mainly for the needs of supporting projects, and the corresponding geological conditions for classification. Reasonable and in line with the actual classification of the project is very important to the accuracy and rationality of the support design. 2 because of complex geological conditions in China, put forward a lot of rock mass classification, some of which have been widely used in practice, the concrete can be classified as follows: 1. According to the physical and mechanical properties of surrounding rock or geological strength index classification method; according to the rock mass structure, lithologic feature classification; classification method according to the geological and the exploration method of integrating various factors; the classification according to the law; according to classification of tunnel stability. The highway