拟建川藏铁路夏里2^(#)沟泥石流发育特征及动力学过程数值模拟

DEBRIS FLOW DEVELOPMENT CHARACTERISTICS AND DYNAMIC PROCESS NUMERICAL SIMULATION OF XIALI 2^(#) GULLY ON THE PROPOSED SICHUAN-TIBET RAILWAY

夏里2^(#)泥石流沟位于昌都市八宿县夏里乡,根据川藏铁路规划,其线路从夏里2^(#)泥石流堆积扇附近以夏里大桥形式经过。受2013年昌都"8.12"地震影响,夏里2^(#)泥石流沟流域沟谷两侧危岩崩塌普遍发育,存在较丰富崩塌和沟道松散物源,具备暴发较大规模泥石流的可能性,对拟建川藏铁路夏里大桥构成潜在威胁。为掌握泥石流的危害程度,在查明泥石流发育特征基础上,采用CFX软件对夏里2^(#)沟可能暴发泥石流运动过程进行了数值模拟,结果显示100 a一遇泥石流运动堆积至拟建线路附近,且淹没堵塞主河,对拟建大桥桥墩施工及安全运营构成淤埋和撞击威胁,并根据数值模拟结果提出相应的防治措施建议。

Xiali 2^(#) debris flow gully is located in Xiali Township,Basu County,Changdu City,according to the plan of the Sichuan-Tibet Railway,its line passes through the Xiali Bridge near the Xiali 2^(#) debris flow deposition fan.Affected by the 2013 Changdu"8.12"earthquake,dangerous rock collapses on both sides of Xiali 2^(#) debris flow gully are generally developed,and there are abundant collapse and loose sources in the gully,and there is the possibility of large-scale debris flow,which constitutes potential threat to the proposed Sichuan-Tibet Railway.In order to understand the damage degree of debris flow,based on the identification of the development characteristics of debris flow,CFX software is used to simulate the movement process of Xiali 2^(#) debris flow.The results show that the debris flow with a frequency of 100 years accumulates near the line and submerges the main river,which constitutes a threat to the construction and operation of the line.And according to the numerical simulation results,relevant prevention and control suggestions are put forward.