成渝客专石材采空区的勘察与评价研究

Research on the Survey and Evaluation of Chengdu to Chongqing Inter- city Train Stone Goaf

研究目的:成都至重庆铁路客运专线荣昌至永川段通过侏罗系中下统自流井组(J1-2z)夹石灰岩地层,石灰岩被大量开采后形成石材采空区,石材采空区分布广、埋深浅,地表易变形、开裂、塌陷,对客运专线工程危害极大,因此有必要查清其工程地质条件并进行正确的评价和处理。研究结论:通过对成渝客专荣昌至永川段分布的大量石材采空区进行勘察与评价研究,得出以下结论:(1)石材采空区勘察难度大,应进行综合勘察,在推测的采空区域和物探解译的采空疑似区域布置大量的钻孔验证,成果资料应综合分析研究;(2)影响石材采空区稳定的不确定因素多,应坚持定性评价和定量评价相结合的评价方法,结论应相互验证;(3)对于高速无砟轨道,应选取边界角来计算安全距离,并预留一定的围护带宽度,确保工程安全;(4)本研究成果可为类似通过采空区的铁路、公路工程勘察设计提供借鉴。

Research purposes： Chengdu to Chongqing inter - city train Rongchang to Yongchuan section through mudstone shale clip limestone of Jurassic Ziliujing stratum, stone of the mined out area is formed after limestone is a large mining. Stone gob has wide distribution, shallow buried depth, surface easy deformation, cracking, collapse, great harmful to the inter - city train engineering, so it is necessary to find out the engineering geological conditions, and the correct evaluation and treatment. Research conclusions：Investigation and evaluation of research through Rongchang to Yongchuan section of Chengdu to Chongqing inter - city train distribution of a large number of stone mined out area, we can draw the following conclusions： （1） The stone mined out area investigation difficulty is big, should carry on the comprehensive investigation in the borehole, verify the air region and interpretation of geophysical exploration of mined out area is arranged a large number of suspected speculation, achievement data should be comprehensive analysis and research. （2） Affecting the stone goal stability of uncertain factors, we should adhere to the qualitative evaluation and quantitative evaluation method combining with evaluation, conclusions should be mutual authentication. （3） For high - speed ballastless track, it should be selected to calculate the safe distance from boundary angle, and set aside a certain width of protection zone, ensure the safety of the project. （4） The research results of this paper can provide references for survey and design of railway and highway projects through the mined out area.