Study On The Subgrade Diseases In Permafrost Of Qinghai-Tibet

Rolling stone of mountain are common natural disaster, with the rapid development oftraffic cause in our country， more and more highway be constracted in the mountain。At thesame time, bridge as a connection project is often met with the dangers of the Rolling Stones.Especially in geological disaster-prone areas such as earthquakes, floods, the slope wasdamaged after earthquake, or flood, then the Rolling Stones often can occur secondarydisasters, causing regional bridge damage even collapse of the bridge。Especially after the5.12earthquake, roll stone to endanger the safety of the bridge is more and more arousepeople’s attention, and surrounding rock in this paper the impact of the shock theory,calculation method and mountain bridge anti-collision system study.This paper first obtains from the Rolling Stones to the harm of traffic engineeringfacilities, research the status of the Rolling Stones at home and abroad，and focus on theRolling Stones collision calculation theory, then by comparing the domestic and foreignrelevant rolling impact force calculation of main algorithms and experimental results ofrolling impact, analyses the existing rolling impact algorithm, for the engineering practicebetter and more accurate access to impact the design value provides a meaningful advice, andfor more in-depth research impact force calculation and provide reference to carry out theimpact of the related experiments.Finally combining with rolling stone and the present situation of bridge anti-collision inour country, then analyzed transverse stress of double column pier in mountainous area, andput forward relevant mountain bridge pier protective system。the system mainly from threeaspects to reduce the rolling stone of a bridge pier collision damage, one is from the source,the location of the bridge rolling disaster often occurred in the area of prevention and controlof the rolling stone, reduce the source of the Rolling Stones, secondly from the collision ofpiers, bridge piers with rolling disaster area by installing anti-collision facilities, to minimizethe impact the impact of the bridge pier in rolling stone, improve the safety of the bridge, andfinally from the pier anticollision strength of itself, through the design to improve bridge piertransverse impact strength to resist the Rolling Stones. The mountains in the future for theconstruction of the bridge maintenance has the very good guidance significance.