渝昆高铁斜坡软土地段方案研究  

The Study on the Scheme of Slope Soft Soil Area of Chongqing-Kunming High-speed Railway

作　　者：张翔 Zhang Xiang(China Railway Liuyuan Group Co.,Ltd.,Tianjin 300308,China)

机构地区：[1]中铁第六勘察设计院集团有限公司,天津300308

出　　处：《铁道勘察》2022年第1期39-44,共6页Railway Investigation and Surveying

基　　金：中铁第六勘察设计院集团有限公司重点科研开发课题(KY-2018-17)。

摘　　要：为解决渝昆高铁某工点斜坡软土地段工程地质问题,对其物理力学特性及工程地质特性进行分析,采用瑞典条分法及传递系数法分别对路基方案、桥梁方案进行稳定计算,通过搜索小于规范要求的圆弧滑动面集合,确定最危险圆弧滑动面抗稳定性系数及最大推力,发现地震工况下路基、桥梁方案均存在安全隐患。为彻底解决斜坡软土工点的安全隐患,结合沿线斜坡软土分布范围,采用综合评价的方法,对线路平面方案进行多方案比选研究。研究表明,斜坡软土工程性质极差,采用路基、桥梁方案均存在不稳定的风险,应优先选择绕避。经综合评价分析,线路平面方案推荐东侧隧道方案。In order to solve geological problems in the soft soil sections of the Chongqing-Kunming High-speed Railway,the physical and mechanical properties and geological properties of the soft soil on the slope of a construction site were analyzed and studied.The stability of the subgrade scheme and the bridge scheme was analyzed and calculated by the swedish slice method and the transfer coefficient method respectively.Based on the analysis and determination of the anti-stability coefficient and the maximum thrust of the most dangerous circular arc sliding surface,it was concluded that there is a hidden danger of instability in the arrangement of work points according to subgrade and bridge schemes under seismic conditions.On the basis of the above research,in order to solve the safety hidden danger of the slope soft soil site thoroughly,combining with the distribution range of the slope soft soil along the line,the multi-plan comparison and selection of the line plan were studied,and the optimal solution was obtained by the comprehensive evaluation method.The study shows that the engineering properties of slope soft soil are poor,and the subgrade and bridge schemes have instability risk under the working conditions of high intensity seismic zone.After comprehensive evaluation and analysis,the eastern tunnel scheme is recommended for the line plan scheme.

关 键 词：高速铁路 不良地质 斜坡软土 稳定性 方案研究 

分 类 号：U212.3[交通运输工程—道路与铁道工程] U213.1