研究目的:格尔木至库尔勒铁路穿越塔里木盆地,伴随着G218国道和塔里木河道在塔克拉玛干沙漠与库姆塔格沙漠之间穿行,其中通过的台特玛湖区处于库姆塔格沙漠向塔克拉玛干沙漠补沙的一条低洼及狭窄的输沙通道上,风沙流现象很严重,对铁路的建设和以后的运营养护都产生很大影响,设置的工程还有可能对G218国道的通行产生影响,因此,选择合适的工程方式通过严重的风沙流区段是本文研究的重点.研究结论:通过对线路行经的台特玛湖区域风沙流的特征和环境地质条件进行分析,在充分收集和分析了大量风沙资料的基础上,认为工程的设置应满足:(1)以疏沙为主,不宜设置阻沙工程;(2)减少对环境的改变,不能加重风沙对G218国道的影响;(3)运营期的养护维修相对容易,经路基、桥梁和明洞隧道三类工程方案对比,只有选择桥梁方案通过并控制桥下净空能满足上述条件;(4)该案例为以后在严重不良地质区域建设铁路时应在充分收集和分析资料的基础上进行多方案研究及论证方面提供了借鉴.%Research purposes:Golmud-Koala Railway passes through the Tarim Basin,goes through the Taklimakan and Kumtag Desert with G218 National Highway and Tarim River.Taitema Lake area through the Golmud-Korla Railway is located in a low-lying sediment transportation channel from Kumtag Desert to Tarim Desert,and the railway crosses the wind-sand flow area where the desertification is serious,the construction of the railway and subsequent operations will be affected by the wind-sand flow,the project could also have an impact on the traffic capacity of G218 National Highway.Therefore,choosing the appropriate engineering means to pass the serious wind-sand flow area is the focus of the study.Research conclusions:Through analyzing the characteristics of wind-sand flow and environment geological conditions of the section of Taitema Lake where the railway passes through,on the basis of the full collection and analysis of a large number of sand data,the project settings should meet three requirements:(1) to dredge sand and should not set up sand blocking project;(2) reducing the impact on the environment and cant aggravate the impact of sand on the G218 National Highway;(3) the operation maintenance is relatively easy in operation period.The bridge program to pass through and control the clearance of the bridge could meet these conditions after comparing the three types of engineering of roadbed,bridge and tunnel.This case provides a good reference for future multi-program research and demonstration in the construction of railways which on the basis of the full collection and analysis of a large number of data in serious adverse geological area.
展开▼
