| Mine-tailing pond is one of the most indispensable facilities related to mine industrial production,but also a major risk source of artificial bodies with high-potential energy.The safety of tailing dams is an important step to ensure the safe operation of mine-tailing ponds,and the geogrid has a long-standing application in soil reinforcement.Thus,the study on the geogrid reinforcement in mine-tailing dam is also very meaningful.It is not uncommon to adopt geogrid reinforcement in improving the safety of mine-tailing dams.And relevant research has made some impressive achievements.Studies on the sensitivity of influential factors are conducted earlier in the geogrid-soil reinforcement structure of retaining walls and slopes than that of mine-tailing dams.What’s more,most studies on influential factors are carried out based on the single factor method,only few focus on multi-factors sensitivity.Based on previous researches,this paper studies the sensitivity of geogrid factors on the safety coefficient related to geogrid reinforcement in mine-tailing dams.This paper employs the strength-shear method with finite elements to calculate the safety coefficient so as to further study the sensitivity of geogrid factors on the safety coefficient related to geogrid reinforcement in mine-tailing dams.Before this,this paper will first probe into the synthetic criteria concerning reinforced slopes’ ultimate state of the strength-shear method with finite elements.Generally speaking,The main contents of this paper are as follow:1.According to the deficiencies of discordant synthetic criteria of the strength-shear method with finite elements,this paper takes two reinforced slopes as examples.After analyzing every criterion,this paper puts forward asynthetic criterion to determine the safety coefficient of geogrid reinforced slopes.2.This paper designs the test of singleindex and multiple factors according to orthogonal method.By choosing laying length(L),laying distance(D),laying angle(θ),tensile strength(T)and geogrid modulus(E)as influential factors and adopting the L25(56)orthogonal table for 25-group scheme arrangement,this test tries to get corresponding safety factor(F)based on synthetic criteria through the strength-shear method with finite elements and make analysis on both the sensitivity and the significance of all available factors separately via variance analysis.results show the sensitivity of all influential factors on stability and safety factor as follow in order of most to least: laying distance(D),tensile strength(T),geogrid modulus(E),laying length(L),laying angle(θ).the remarkable test show that laying distance(D)and tensile strength(T)both have very remarkable influence on stability and safety factor and geogrid modulus(E)comes second,while laying length(L)only shows a little and laying angle(θ)little. |
