Method of shallow-buried-tunnel surrounding-rock collapse mode recognition and support structure calculation

Abstract

In the invention, a new tunnel surrounding-rock slip crack face recognition method based on curves of settling tanks at different depths is established through correspondence relationships between widths of the settling tanks at the different formation depths and maximum potential failure points, a numerical analysis method of discrete media is provided to simulate a collapse mechanism of loose shallow-buried-tunnel surrounding rock, finally, comparison with a general numerical analysis method is carried out on the basis of engineering practice, the rationality and the applicability of the method of the invention are verified, and a set of scientific analysis methods are provided for identification of collapse failure modes of loose shallow-buried-tunnel surrounding rock, support structure design, surrounding-rock stability evaluation and the like.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and relates to a method for identifying the collapse mode of surrounding rock of a shallow-buried tunnel and calculating a supporting structure. Background technique [0002] Among the large-scale effective use of land, the most common is the development and utilization of underground caverns and space resources, among which the use of transportation tunnels and water delivery tunnels has become an important part of underground space development resources. With the advancement of construction technology, my country The rate of engineering accidents such as landslides and roof falls in tunnel engineering shows a downward trend, but according to the statistical results of landslides in a large number of highway tunnels, it is shown that more than 80% of tunnels with a span of 10-15m have landslides, and more than 90% of them have landslides in surrounding rocks of type IV to VI. Tunnels wi...

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Problems solved by technology

In this way, the traditional support structure design theory is not applicable to shallow buried loose surrounding rock, and the structural load method is difficult to consider the interaction between surrounding rock and support structure, and it is difficult to consider the shear load of local collapse of loose rock mass The impact of the action on the damage of the supporting structure, the finite element method can consider the above structure and the interaction mechanism of the rock mass, but it is difficult to consider the loose characteristics of the rock mass, and it is often difficult to obtain the real mechanical parameters of the rock mass with the discrete element method. A large number of trial calculations are used to determine rock mass parameters, which creates a big dilemma for the information design and construction of support parameters

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