中国矿山工程

In order to analyze and evaluate the slip stability of dangerous rock body formed by the combination and cutting of steep-inclined structural planes, taking the dangerous rock body of Longsi CIV-1 slope as an example, a simplified geological model, a generalized theoretical model of instability and a mechanical analysis model of dangerous rock body under the influence of frost heave, earthquake and hydraulic factors were established according to the measured data, the dimensionless calculation formula of coefficient of sliding stability of dangerous rock body is derived by using limit equilibrium theory and assumption of improved groundwater pressure distribution. using mathematical model focuses on the influence of various factors on the slip stability of the dangerous rock body, and diagrams get drawn which express the relationship between freezing effect, seismic effect, hydraulic effect, the geometry of the dangerous rock body and the coefficients of slip stability when the dangerous rock body is saturated. The calculation example analysis shows that: the slip stability of the dangerous rock body gradually decreases as frost heave coefficient increases; it decreases as bedding plane or height of posterior edge crack increases, and the larger bedding plane or height of posterior edge crack, the more sensitive the effect of frost heaving on stability will be; it decreases as vertical or horizontal seismic action coefficient increases, and the effect of horizontal coefficient is more significant than vertical coefficient, However, the sensitivity of the effect of horizontal coefficient and vertical coefficient on the stability of the dangerous rock body is different under various hydraulic states; In addition, it decreases as height and angle of vertical face in front of slope increases , and the rate of its decrease declines with the increase of height or angle of vertical face in front of slope.