Study On Energy Method To Analyze The Stability Of Anchored Rock Mass

In despite of the importance of the study on rock mass stability and the extensive use for the anchoring technique, the method for the analysis in stability of anchored rock mass is still deficient. So, a dynamic analysis method for the stability of anchored rock mass containing the continuous structural plane will be founded on the energy method in this article. There are for features for the new method as follows: (1) The stability criterion for the rigid body and the pitch angle of the force between two strips will be deduced according to the energy method. (2) The damage disparities between the random two dots on the slip plane, between the random two anchoring bars and between the slip plane and the anchoring bar will be considered. (3) The influence that the anchorage effect brings to the positive stress distribution on the slip plane will be considered. (4) The dynamic analysis for the stability of anchored rock mass containing the continuous structural plane is the course that is from the time when the rock mass begins to slide to the time when the rock mass recovers the stability or loses stabilization. The sequence of the study in this article is as follows: First, the calculation model that can reflect the progressive destabilization of the rock mass was founded according to the characteristic of shearing deformation to the structural plane. And the strength criterion to the structural plane was determined according to the principle of shear failure and the mechanical effect under the sliding state. Second, according to the stress distribution on the slide plane, the calculation model that can reflect the relationship between the slippage of the rock mass and the anchoring capability was founded, and the method that the damage of the anchoring bar is identified was determined. According to the way that the anchoring load diffuses and delivers, the equations to the subsidiary stress generated by anchoring effect were deduced and the ultimate shearing strength to sliding plane was determined. Third, the stability criterion for the rigid body and the pitch angle of the force between two strips were deduced according to the energy point of view. And the assurance coefficient K was redefined subsequently. Forth, the equation of the assurance coefficient K was deduced according to the new definition. At last, according to the new method in this article, the computer procedure for calculation was programmed and was used to analyze the examples.