西南及邻区高速铁路岩溶工程地质分区研究

Study on Karst Engineering Geological Zoning of High Speed Railway in Southwest and Adjacent Areas in China

我国西南及邻区发育分布有大量的可溶岩,随着中西部高速铁路建设的加大,大量的铁路不可避免的穿越岩溶发育区,岩溶问题给该区域的高速铁路选线及建设带来巨大的挑战。根据多条已建成和在建的岩溶山区高速铁路岩溶工程地质问题,探讨这些地区高速铁路建设所面临的主要岩溶工程地质问题。拟定以地形地貌、气候和高铁主要岩溶问题为主控因素的分区原则,构建高原岩溶区、斜坡过渡带岩溶区、岩溶化平原区等3大高速铁路岩溶工程地质区;在此基础上基于地层岩性、地质构造、岩溶发育程度和岩溶水系统特征为控制因素的分区原则,细分为17个高铁岩溶工程地质亚区。高速铁路岩溶工程地质分区的研究成果,有利于针对西南及邻区不同的岩溶工程地质分区特点,制定相应的高速铁路勘察设计方案,以查明铁路建设遇到的复杂岩溶工程地质问题,拟定相应的工程措施,规避铁路建设的工程风险。

In southwest China and adjacent areas are distributed a lot of limestone.With the increase of high-speed railway construction in the central and western regions,the karst brings great challenges to the high-speed railway route selection and construction to allow the railway to cross the karst development area.This paper addresses the karst engineering geological problems encountered in high-speed railway construction.The zoning principles on the controlling factors such as topography,climate and main karst problems faced by high speed railway are formulated,and the karst engineering geological divisions involving high-speed railway construction such as plateau karst area,slope transition zone karst area and karst plain area are established.Based on the zoning principle,the areas are subdivided into 17 sub divisions based on the control factors of stratigraphic lithology,geological structure,karst development degree and karst water system characteristics.Research results of karst engineering geological zoning for high speed-railway show that it is beneficial to formulate corresponding high-speed railway survey and design plan by karst engineering geological zoning in southwest and adjacent areas,to identify complicated karst engineering geological problems encountered in railway construction,and to draw up corresponding engineering measures to avoid engineering risks of railway construction.