洋板块地质与川藏铁路工程地质关键区带

Key Zones of Oceanic Plate Geology and Sichuan-Tibet Railway Project

首先解构了川藏铁路廊带不同区段工程地质差异性的复杂地质构造背景,简述了洋板块地质学的核心理念和科学意义,指出川藏铁路雅安-林芝段贯穿的7条洋壳俯冲消减增生杂岩带(蛇绿混杂岩带),伴随中新世以来青藏高原强烈隆升均转化为新构造活动带、活动地震带、高地热活动带及地质灾害频发带,是川藏铁路攻坚克难的关键区带,也是认识理解不同地质背景区段构造岩石组合、不同变质程度、不同变形样式的有序或无序结构,并制约不同岩土力学特征和特殊不良地质体行为的切入口,是高质量高标准实现铁路工程建设的关键.

The complex geological structure background of engineering geological difference in different zones of Sichuan-Tibet railway corridor is deconstructed,described the core idea and scientific significance of ocean plate geology.It is pointed out that there are seven oceanic subduction(Ophiolitic Melange belt)which accretion complex belts running through the Ya′an-Linzhi section of Sichuan-Tibet railway.With the strong uplift of the Qinghai-Tibet Plateau since Miocene,all of them are transformed into neotectonic active zone,active seismic zone,high geothermal active zone and geological disaster frequent zone.It is the key zone for Sichuan-Tibet railway.It is the key point of understanding that what is different geological background structure-rock combinations,different degrees of metamorphism,ordered or disordered structure of different deformation patterns,and restrict the behaviors of different rocks,soils and special unfavorable geological bodies;It is the key to complete the Sichuan-Tibet railway construction with high quality and high standard.