its fractal faults;made clear the consequence between theconfiguration fraetal and earthquake activities. 5.The dimensions law of蛐size distribution of loose deposits along thenational road 3 1 7 from Doujiangyau to Wenchuan(7一site in road sectiollK74+775~K75+740)were studied,the results showed that the grain sizedistribution of loose deposits have fractal sll’ucture,and the dimensions increasewith slope height’when the value of dimensions was littler,the more componentsof coarse grain to loose deposits on slope,but the value WaS greater,the morecomponents of smaller眦in a word,the value of dimensions 。
varied from twoto three. From the theory ofparticle flow,combined、撕Ⅱl the test results of large-scale第VI页 西南交通大学博士研究生学位论文relative density meter and direct shear apparatus,the relation betweenmacroscopicaUy mechanical character of the identical particles and the fi’actalsdistribution of grain size Was discussed based on the data of experiments.Furthermore,we also deduced the relation bet、Ⅳeen coe伍cients of S拄esS,峻andgmk-塔density of loose deposits and dimensions of grain size distribution.Fromthese results,we found the fluidness of loose deposits was not flowing,when thevalue of dimension D of grains Was little,during the landslip process,the effect ofdisturbances upon the systems of loose d印os妇on a slope strengthened the loosedeposits fall,acx.Drdingly,it limited the increasing trend of systerns sensitivity,andthe intensities of disturbances does not always exceed the capability ofself-stability,ultimately,the system of loose slope had the character of SOC.Sowe deduced the capability of a system of loose slope restriction againstdisturbances spreading Was decided by the fractal character ofsystem itself. 6.Tllis article analyzed a characteristic of Self-organized criticality of rockfailure process.A method which use Self-organized extent parameter a t0 expressstress tmmfer among units and stress concentration in local units Was put forward.Based on the theory that the failure strength of rock units 0bey second powerWeibull distribution,a mechanical model Was established with renorrnalizationgroup theory,and the critical probability of rock failure,pc,was derived.Resultsindicate that the failure of units is independent and stochastic,and the systemevolves to a stable state when the failure probability of unit,P,is less than thecritical failure probability PC.When P is higher than pc,the failure of traits focuson the macroscopic-transfixion tension split plane,which is a dynamic attractor ofSelf-organized criticality.The critical failure probability pc and the tmit capacity ofbearing external load F is related to initial condition.pc嬲well蠲F/Fo,decrease耐th the increase of Self-organized extent parameter 0;and furthermore,F/Fo<I.111e failure stress ofunits decreases due to stress tramfer. 7.We testified the disaster of landslips have the character of SOC using thespace distribution of landslips in a region,and analysis on sequence ofvelocity andtime to a single landslip evolvement process. Landslides generally ocCur on the main slide surface whose strength iS thelowest among multitudinous discontinuities.Traditional stability analysis methods
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