Surrounding rock displacement early-warning method based on damage dilatancy theory

A technology of surrounding rock and displacement, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of large error, no consideration of the expansion effect of the surrounding rock excavation loosening process, lack of scientific basis, etc., and achieves good popularization. Value, Avoiding Complexity, Ease of Operation Simple Effects

Active Publication Date: 2018-03-13
HOHAI UNIV
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Problems solved by technology

At present, the theoretical and standard calculation methods used in the project have large errors between the prediction results and the actual results. The main reason is that the expans

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  • Surrounding rock displacement early-warning method based on damage dilatancy theory
  • Surrounding rock displacement early-warning method based on damage dilatancy theory
  • Surrounding rock displacement early-warning method based on damage dilatancy theory

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Embodiment 1

[0044] Taking the Fenshuijiang water delivery tunnel as an example, the simplified excavation radius is 3.7m. The equivalent expansion coefficient of the surrounding rock is related to the damage degree of the surrounding rock and the mechanical properties of the surrounding rock. Therefore, the displacement change law of the surrounding rock under the conditions of different equivalent expansion coefficients and different buried depths is first studied, in order to predict the amount of deformation and the tunnel excavation support. The protection design is used as a reference.

[0045] The expansion process of the rock mass reflects the degree of damage to the rock mass, and can also provide reference for the design of support structures such as grouting and bolt-spray support. For different dilatation states under different conditions, taking Type II, Type III, Type IV, and Type V rocks as examples, formula (5) is used to calculate the surrounding rock displacement. The ca...

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Abstract

The invention discloses a surrounding rock displacement early-warning method based on a damage dilatancy theory. The surrounding rock displacement early-warning method comprises the following steps that 1, a calculation formula of surrounding rock pressure pi is obtained based on a traditional Fennar formula through elastic mechanical solution, a dilatancy coefficient k is introduced, the dilatancy effect of the damage dilatancy and deformation of a surrounding rock along with the excavation process is considered, and a formula, giving consideration to the dilatancy effect of a surrounding rock damage zone, of cavity wall displacement u0 is obtained; 2, hierarchical displacement calculation considering the dilatancy effect is conducted on the surrounding rock in the damage dilatancy zone;3, according to stress-strain curve characteristics in the rock damage dilatancy process, a three-level early warning safety management design system is established, and construction safety control isguided. A surrounding rock three-level damage dilatancy early-warning state is established so that the cavity wall displacement situation can be more really and accurately predicted, and the influence of a supporting structure is considered, therefore, the method can be also carried out according to the characteristics of different design stages such as preliminary design and construction design,is very easy to popularize and has an engineering application value.

Description

technical field [0001] The invention relates to the technical field of underground engineering construction, in particular to a surrounding rock displacement early warning method based on the theory of damage expansion. Background technique [0002] The tunnel excavation process of mining method construction often adopts dynamic monitoring and measurement method for early warning control, among which displacement monitoring is one of the main methods. Generally, the change process of displacement is monitored, and the safety is judged according to the displacement rate and total displacement. Therefore, displacement early warning The value and its prediction become the key issue. For this problem, there are three main methods at present: theoretical calculation, normative empirical value determination and numerical calculation. Due to the complexity of the numerical calculation process, it has not been popularized in the design and construction process, and the normative ex...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 沈才华古文博王媛李鹤文
Owner HOHAI UNIV
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