Determination Of Mechanical Parameters Of Slope Rock Mass

The value of rock mechanics parameters is complex and has been the Focus of many scholars for a long time,Because there are many different structural planes in the rock mass.Because of the existence of many different structural planes,the macro mechanical parameters of rock mass show the characteristics of heterogeneity,anisotropy and size effect.The reasonable value of mechanical parameters of rock mass is the basic premise of slope analysis,and also the key point in the practical application of slope treatment,Directly reflected in the slope of the economy and safety.The main contents of this paper include the following aspects:(1)The CSMR classification of slope rock mass system is analyzed,The main quantitative parameters Rock quality index(RQD),discontinuity spacing,F1,F2 and F3,rock mass strength,The continuous function is obtained by linear fitting instead of the original function,Refine the score interval and the corresponding mechanical parameters,reduce the influence of human factors on the range selection.(2)According to the Monte-Carlo principle,the stochastic distribution model of the fracture network of rock mass discontinuities is obtained.The rationality of the numerical analysis model is analyzed by choosing the feature trace length,and the size of the unit body is obtained.(3)According to the fractal theory,the overall shape of the slope is the same as the local fractal dimension.The characteristic track length corresponding to the arbitrary area on the slope has a similar relationship with the characteristic length of the slope.The possibility of determining the mechanical properties of slopes from small specimens is analyzed.And when the fractal dimensions are the same,there exists a proportional relationship between the jointed rock mass of different sizes and the characteristic traces length.The characteristic traces of jointed rock masses of different sizes are obtained,and the scale and range of joint fracture statistics are determined.(4)The relationship between the slope height and the unit body REV is analyzed.It is found that the slope height has a weakening effect on the rock strength.And the relation between the height of slope and the characteristic trace length of the unit is obtained H=17.1R.A method is proposed to estimate the rock mass strength by using the rock strength of a small test specimen and the characteristic trace length of a unit.(5)An engineering example is given by using the CSMR method,the numerical simulation method,Characteristic trace length method and the macro meso damage mechanics method,comparative analysis and verification.