Method for establishing damage model of cemented filling body containing initial damage

Abstract

The invention discloses a method for establishing a damage model of a cemented filling body containing initial damage. The method comprises the following steps of 1, determining an initial damage equation of the cemented filling body containing the initial damage, 2, determining a load damage variable function considering a damage threshold, 3, determining a damage constitutive equation of the cemented filling body containing the initial damage under the action of the load, 4, determining the constitutive relation of the cemented filling body in the initial damage and load damage coupling state, 5, determining a total damage variable equation of the cemented filling body containing the initial damage in a coupling state, 6, determining a total damage evolution equation of the cemented filling body containing the initial damage under a compression condition, and 7, determining a damage model of the cemented filling body containing the initial damage. The method is reasonable in step, the damage model containing the initial damage cemented filling body is deduced and established, scientific reference basis is provided for effectively utilizing the tailing cemented filling body to maintain goaf surrounding rock stability and guarantee safe production, the effect is remarkable, and popularization is convenient.

Description

technical field [0001] The invention belongs to the technical field of mine filling and mining, and in particular relates to a method for establishing a damage model of a cemented filling body with initial damage. Background technique [0002] In the practice of mine filling engineering, the material of the cemented filling body is first mixed thoroughly by a mixer, and then transported to the underground goaf by pipeline. The cemented filling body is usually used to temporarily or permanently support the goaf, and its mechanical properties are similar to concrete For example, the preparation process of the cemented filling body and the water seepage during the hardening process, drying shrinkage, and the heat of hydration of the cement are likely to cause initial defects such as air bubbles, holes, micro-cracks, and micro-pores inside the filling body material, and these initial defects control the brittle material. The failure mechanism determines the structural strength o...

AI Technical Summary

Problems solved by technology

According to the theory of continuum damage mechanics, it is very difficult to directly measure the initial damage variables. So far, no one has carried out detailed quantitative measurements on the distribution of initial defects in brittle materials, and there is also a lack of reasonable damage model establishment methods for cemented fillings with initial defects.

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