特大型桥梁工程地质勘察区域地壳稳定性研究

重大工程区域地壳稳定性研究，是工程前期工程地质勘察的重要内容之一，并越来越多地为工程建设所重视。大桥工程地质勘察以往对此涉及较少，也无明确的统一规定，以长江上所建特大桥为例，对此项工程作了些探索性的研究，重点研究的问题是：区域构造环境及构造变形，地壳结构和深部构造，新构造活动，断裂活动，地震活动等，为大桥建设宏观决策和抗震设计提供依据。

Stability analysis on earth crust in geologic exploratory region of especially big bridge

Study on stability of earth crust in construction areas of important projects is one of the important contents of engineering geologic exploration in the early stage,and has attracted increasing attention from engineering circles.Engineering geologic exploration for building grand bridges rarely involved this aspect in the past,and there was no clear stipulation about it.Taking completed huge bridges on the Yangtze river for instance,pilot study on this subject was conducted,with its amphasis on regional tectonic environment and tectonic deformation,crust structure and deep structure,new tectonic activity,fracture activity,seismic activity,etc.This study can provide basis for making macro decision on construction grand bridges and for their earthquake-resistant design.