进藏交通干线减灾选线理论原则

THEORETICAL PRINCIPLES ON SELECTION ROUTE OF TRAFFIC MAINLINE ENTERING INTO TIBET FOR MITIGATING MOUNTAIN HAZARDS

根据青藏高原及进藏公路、铁路的特点,提出进藏交通干线减灾选线的6项理论原则:与山系正交,以高桥长隧垂直爬上第三地势阶梯;分段展线,尽早脱离河谷上行至高原面;绕避为主,沿河线路跨河、进洞躲避山地灾害群;山地灾害坡向分异,沿河线路多经阴坡、少经阳坡;宁高勿低,沿河线路按重灾群灾上界高度定线;高原面线路多填少挖,按最佳填方高度定线。

Basis on characteristics of Qinghai-Tibet plateau and railway and highway entering into Tibet, six theoretical principles on selection route of traffic main-line entering into Tibet for mitigating mountain hazards as follows. 1) Rotre perpendiculars to mountain chain and vertically climbs up the No. 3 relief step with tall bridge and long tunnel. 2)With circle and turn respectively,route separates oneself from river valley and climbs up the plateau surface as soon as possible. 3)It is main for mitigating hazards of route along river that avoiding mountain hazard gruop with adopting bridge of stride across the river and tunnel of entering into hill. 4)Because mountain hazards have difference related to aspect of valley,most route along river must through schattenseite and the route of through another side must be a few. 5)In serious hazard and group hazard sections,route along river would rather more high and must not more low. Elevation of the route must over largest level of the hazards. 6)On the plateau surface,most road must be filled and cut road must be a few. The route is determined by best high of filling.