三江并流地区线性工程复杂地质问题及防治

Complex Geological Problems and Prevention of Linear Engineering in the Three-parallel-river Area

文章对三江并流区内在建的香丽高速公路与丽香铁路的主要工程地质问题进行研究,指出不良地质体作用下桥隧的安全问题及高陡斜坡失稳是制约这两条线路建设的主要问题,通过对典型工点虎跳峡互通立交和K92路堑边坡的分析,提出针对桥隧结构穿越大型不良地质体,不宜进行原位整治,建议采用绕避改线的措施;对于高陡斜坡失稳的问题,建议采用刷方减载+多级多次分段控制注浆钢锚管的综合防治措施。

In this paper, the main engineering geological problems of Shangrila–Lijiang Expressway and Lijiang–Shangrila Railway under construction in the Three-parallel-river area are studied. It is pointed out that the safety problems of bridges and tunnels under the action of unfavorable geological bodies and the instability of high and steep slopes are the main problems restricting the construction of these two lines. Through the analysis of Hutiaoxia Interchange and K92 cutting slope at typical construction sites,it is proposed that the bridge and tunnel structure should not be in situ remediation as they pass through large unfavorable geological bodies. It is suggested to adopt the measures of bypassing and rerouting. For the problem of high and steep slope instability, it is suggested to adopt the comprehensive prevention and control measures of load reduction by moving earthwork + multi-stage and multi-time segmental control grouting steel anchor pipe.