The Measuring Method And Research Of In-situ Stress

Whether the ground or underground, two kinds of essential information are necessaryfor the design and construction of engineering construction. One is the absolute stress,namely primary rock stress, that is to say, rock mass is the natural state of stress beforethe excavation engineering; the second is the relative stress, the changes rock mass stressoccurs in engineering excavation process and after engineering finished. These two kindsof stress are compared, the absolute stress is much more important than the relative stress.If in the original rock stress condition, through the numerical calculation method, stressand its variation can be accurately obtained in the excavation process of rock. Therefore,the absolute stress measurement and its measuring method is the main research object inrecent decades.This paper first discusses the in-situ stress and effect of stress causes more complex,including the physical mechanics of gravity, tectonic movement, continental plateboundary pressure, surface erosion, water temperature, and physical and mechanicalproperties and so on. Then the distribution regularity of stress is analyzed, furtherunderstanding of the internal stress state, and then various existing methods inclassification, and briefly introduces the current our country the most commonly usedmethod, describes the basic principle of in-situ stress measurement methods, theexperimental methods and their advantages and disadvantages. Secondly, the paperproposes hollow inclusion strain gauge hole wall deformation method existing in themeasurement step, such as core eccentricity, rock anisotropy and the gel rheology,directional accuracy, degree and rate test etc, the measurement precision and otheraspects in detail in this paper. In the end, the paper is the application of the deformationmethod of the strain gauge deformation method in the stress measurement of the fourcoal mine.The stress influences the stability of engineering construction. The paper introduces various methods of measuring ground stress, and studies the deformation method ofcavity wall.,and put forward the solution of some problems,so as to improve the stabilityof the project.