Thick Soft Rock Hillside Dump Collaborative Study Of The Disaster-induced Debris Flow

The safety of the dump involves not only the safe production,but also the safety of surrounding environment and the local residents.Because the bearing capacity of thick soft rock is low,for the waste dump without good engineering geological condition,it is important how to arrange reasonably the order of dumping waste and to determine the dump parameters,which directly affect the safety and normal usage of the mine production,and the safety of surrounding environment.According to the safety evaluation of the thick soft rock foundation,the collaborative failure of the dump and thick soft rock foundation and the optimum design of subsequent dump, this paper doing some related research,mainly content completed are as follows:1)Systematical analysis the conditions in which the loose earth-rock forms debris flow,and transformation mechanism in theory and numerical simulation,as well as the fluidization of landslide;during the soil liquefying,water is a key role,therefore, during the numerical simulation,propose that use the water content as variable to simulate the gradually instability process of the soil,reveal the mechanics condition of thick soft rock before reaching critical rainfall point of the debris flow initiation.2)Using hill debris risk assessment method for reference,combined with the characteristics of the dump,propose the debris risk assessment method by which evaluate debris risk when the thick soft rock coorperate with the dump,and divide its risk,hereby this paper gives the discriminant result of the dump dangerous area.3)According to YiChang limestone dump landslide and debris prevention system, doing the reseach in this paper is as follows:(1)Using limit equilibrium theory,analysis and evaluate the risk of the dump,and give reasonable load reduction and soil heap scheme;reducing the accumulation height of the soil not to produce concentrated load;(2)At the upper part of the dump digging a flood-cutting channel and on the deformable body digging guide-water way to reduce the collection area and the water-collecting amount,reducing the infiltration capacity of the rain;(3)In the lower water ditch setting a drainage covered conduit prevent the landslide of part steep hill to block nature channel and form barrier lake;(4)With comprehensive application of the integration technology of passive earth pressure and soil mechanics,propose and design "scale" shape foundation,with good effect in engineering;By above reseaches,construct a complete set of dumping form and debris disaster prevention system,and by the operation and practical monitor date,synchronization deformation of the slope has decreased 66%as a good effect.At the same time,this reseach result was also promoted and applied to the dump of HongTian coal mine in YunNan,receiving a good economic and social benefits.