综合勘察技术在高速铁路活动断裂勘察的应用

Application of Comprehensive Survey Technology in Active Fault Investigation of High-speed Railway

研究目的:活动断裂对高速铁路选线具有重大影响,尤其是全新世活动断裂,能引起场地砂土液化、地裂缝、地面沉降及地表变形等次生地质灾害,因此选择正确的勘察技术手段查明活动断裂的位置和活动性对高速铁路地质选线及工程措施建议至关重要。研究结论:(1)通过资料收集、地质调绘、无人机测绘、综合物探、地质钻探、槽探、14C及光释光试验测年等综合勘察技术手段,查明了研究区内安丘-莒县断裂为全新世活动断裂;(2)安丘-莒县断裂东支走滑活动速率为1.49 mm/a,与铁路交叉里程为DK141+780、DK141+940,安丘-莒县断裂西支晚更新世以来垂直活动速率为0.16 mm/a,与铁路交叉里程为DK152+275;(3)高速铁路应大角度穿越安丘-莒县断裂,工程类型宜采用易修复的简易工程通过;(4)综合勘察技术的应用在活动断裂带勘察中取得了良好效果,对高速铁路穿越活动断裂带地质勘察具有一定指导意义。

Research purposes:Active faults have great influence on high-speed railway line selection.Especially,Holocene active faults can cause secondary geological disasters such as sand liquefaction,ground fissures,surface subsidence and surface deformation.Therefore,it's very important to select the correct survey technology to find out the location and activity of active faults for the geological line selection and engineering measures of high-speed railway.Research conclusions:(1)Through data collection,geological survey,UAV surveying and mapping,comprehensive geophysical exploration,geological drilling,trough probe,~(14)C and opto-luminescence dating,it is found that the Anqiu-Juxian fault in the study area is an active fault in Holocene.(2)The strike-slip activity rate of the east branch of the Anqiu-Juxian fault is 1.49 mm/a,and the crossing mileage with the railway is DK141+780 and DK141+940.The vertical activity rate of the west branch of the Anqiu-Juxian fault since late Pleistocene is 0.16 mm/a,and the crossing mileage with the railway is DK152+275.(3)The high-speed railway should pass through the Anqiu-Juxian fault at a large angle,and the project type should adopt the simple project which is easy to repair.(4)The application of the comprehensive survey technology has achieved good results in the investigation of active fault zone and has certain guiding significance for the geological investigation of high-speed railway crossing active faults.