Geostress field distributed data management (DDM) retrieval method based on actual measurement results and linear programming method

A technology of linear programming and stress field, applied in the field of inversion of in-situ stress field, it can solve the problem of inability to obtain the distribution of in-situ stress, and achieve the effect of clear mechanical concept and simple mathematical processing.

Inactive Publication Date: 2013-05-08
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, this patented method also has obvious deficiencies: First, the method uses the acoustic emission method to measure the rock propagating wave velocity to invert the in-situ stress, and can only obtain the in-situ stress value at the measuring point, but cannot obtain the in-situ stress distribution of the entire engineering area; Secondly, the ground stress value obtained by this technology has only two horizontal maximum and minimum ground stress values, while the real ground stress is under three-dimensional conditions, and the vertical ground stress is also necessary for engineering

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  • Geostress field distributed data management (DDM) retrieval method based on actual measurement results and linear programming method
  • Geostress field distributed data management (DDM) retrieval method based on actual measurement results and linear programming method
  • Geostress field distributed data management (DDM) retrieval method based on actual measurement results and linear programming method

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[0051] The underground powerhouse group of a hydropower station project is located in the mountain on the side of the river valley. The slope of the mountain surface is 55°. coarse-grained granite. The project area is mainly affected by 4 faults, numbered fc-1, fc-11, fc-13 and fc-23. There are 6 in-situ stress measurement points. It is proposed to adopt the DDM inversion method based on the actual measurement results and the linear programming method to obtain the in-situ stress field. For the parts that are not described in detail in this embodiment, operate according to the technical solution described in the content of the invention. Normal operation proceeds.

[0052] The specific construction steps of this embodiment are briefly described as follows:

[0053] In the first step, according to the engineering geological survey report on the project site, the engineering data such as topography and fault location can be determined. and fc-23), as well as rock density ρ, ...

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Abstract

The invention provides a geostress field distributed data management (DDM) retrieval method based on actual measurement results and a linear programming method. According to the geostress field DDM retrieval method based on the actual measurement results and the linear programming method, required parameter information is obtained through experiments according to an engineering site geological exploration report, a displacement discontinuous method DDM numerical model is built according to the obtained information, gravity load is exerted in the vertical direction, unit load is exerted in the horizontal x direction, unit load is exerted in the horizontal z direction, an area stress field is obtained through DDM processing, stress data processing values of ground stress actual measuring points are extracted, processing regression coefficients corresponding to each working condition is processed with the linear programming method according to the stress data processing values of each ground stress actual measuring point, combining the stress field obtained by processing each working condition according to regression coefficients, and then summation is carried out to obtain an inversion ground stress field.

Description

technical field [0001] The present invention relates to an inversion method of in-situ stress field in the field of tunnel and underground space engineering, specifically a method for inversion of in-situ stress field based on measured results and linear programming method using displacement discontinuity method (DDM) as a calculation tool . Background technique [0002] In-situ stress is the stress in the natural geological body (rock and soil mass) that has not been disturbed by engineering, also known as the initial stress of the rock mass or the stress of the original rock. The composition of in-situ stress mainly has five aspects: rock mass self-weight, geological structure movement, topography, denudation and sealing stress. [0003] In tunnels, underground chambers of hydropower stations and underground space projects, the ground stress in the project area is an engineering condition that must be mastered in design and construction. The excavation of rock mass in un...

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Application Information

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IPC IPC(8): G01V9/00
Inventor 王颖轶李科黄醒春
Owner SHANGHAI JIAO TONG UNIV
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