Method for monitoring two-dimensional seepage in large-scale single-fractured medium

Abstract

The invention belongs to the technical field of seepage monitoring, and particularly relates to a method for monitoring two-dimensional seepage in a large-scale single-fractured medium. The method comprises the following steps: cutting the large-scale fractured medium to obtain an upper sample and a lower sample which are vertically superposed; arranging a center drilling hole and radiation drilling holes in the middle of the upper sample; arranging a stress sensor on the upper port of the radiation drilling hole; arranging flow rate collectors and flow velocity test devices around the lower sample; injecting a water flow from the center drilling hole of the upper sample to swarm the water flow into the radiation drilling holes to form a plurality of seepage paths to finally flow out form a level fracture surface between the upper sample and the lower sample, and measuring water pressure values and water flow velocities of different seepage paths to obtain lengths of different seepage paths and seepage coefficients at different water pressure conditions. The method can effectively achieve the test monitoring on the two-dimensional seepage performance of the large-scale single-fractured medium, and the high-reliability seepage coefficients of the two-dimensional seepage in the large-scale single-fractured medium can be obtained.

Description

technical field [0001] The invention belongs to the technical field of seepage monitoring, and in particular relates to a two-dimensional seepage monitoring method in a large-scale single-crack medium. Background technique [0002] The monitoring method of two-dimensional seepage in large-scale single-fractured media is the basis for studying the basic mechanical properties of fractured media, especially for the study of the permeability characteristics of fractured media in the case of two-dimensional flow. For quasi-brittle rock materials with fractures, the permeability is an important factor to determine the long-term safety of engineering rock mass. The permeability parameters for evaluating the long-term stability of engineered rock masses are obtained by monitoring the fluid ingress of fractured media. Due to the large scale of engineering rock mass (meter-scale), it is necessary to monitor the seepage of fractured rock mass in a larger scale to obtain the permeabili...

AI Technical Summary

Problems solved by technology

[0003] Existing methods for monitoring the permeability of fractured media measure small media objects (centimeter scale), and the obtained permeability parameters are not accurate when applied to engineering

Many problems have been brought about, such as the permeability parameters of smaller-scale fractured media are often smaller than those of larger-scale fractured media, resulting in conservative engineering design values; the permeable surface characteristics of smaller-scale fractured media are not obvious, and the The surface properties of large-scale fractured media cannot be characterized, which affects the accuracy of measurement results

In addition, most of the existing permeability monitoring methods can only monitor the situation in one-dimensional seepage path, and are not suitable for two-dimensional seepage monitoring methods

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