Deformation characteristics and treatment measures of dangerous rock collapse in an expressway in Chongqing
In this paper,five dangerous rockfall collapses at K1515 of the Shanghai-Chengdu expressway are taken as the research object.Through investigation,statistics,and analysis,the engineering geological conditions and developmental deformation characteristics of the dangerous rockfall collapse area are clarified.The research results show that:(1)the failure modes of dangerous rock masses W1 and W2 are misbreaking and cracking,the destruction mode of W3-1 dangerous rock mass is dumping,the destruction mode of W3-2 dangerous rock mass is sliding,and the destruction mode of W4 and W5 is bulging;(2)the stability coefficient of W1 and W2 is 1.12 and 1.61 respectively,which are in basically stable～stable state;the stability coefficient of dumping failure of W3-1 is 0.41 and in unstable state;the stability coefficient of sliding failure of W3-2 in W 3-2 is greater than 1.35 and in stable state;under rainstorm condition;the stability coefficient of bulging deformation of W4 and W5 is 1.25 and 1.15 respectively,which are in basically stable state;(3)The authors summarize the governance strategy of"reduce risk,minimize disturbance,ensure safe stability and feasible technology",and adopt comprehensive remidiation measures of"embedding concrete retaining wall at the toe of slope+local active SNS network protection+prestressed anchor protection",and the treatment effect was good.It can provide reliable reference basis for the treatment measures of dangerous rock collapse.
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