新建蒙华铁路洞庭湖特大桥工程地质条件研究
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摘要
为查明新建蒙华铁路洞庭湖特大桥的工程地质条件、水文地质条件、地震效应特征,提供客观、真实、准确的地质资料。首先采用遥感、地质调绘等方法查明桥址区的区域地质背景,在其基础上开展桥址区地质钻探、原位试验、物探、土工试验等工作,详细查明了桥址区的地层岩性、地质构造、岩土体特征、水文地质、不良地质、特殊岩土、地震参数、场地类别、场地抗震地段划分等特征。在综合分析勘察成果资料的前提下,对桥梁基础持力层选择、砂土液化、软土体力学性质、桥址区的场地稳定性及场地适宜性等工程地质问题进行了深入研究。研究表明:桥址场区处于相对稳定状态,场区工程地质条件适宜特大桥建设。
For identifying the engineering geological and hydro-geological conditions,and seismic effect characteristics of Dongting Lake grand bridge of the newly built Mengxi-Huazhong railway, providing objective,real and accurate geological data,following work has been done. Firstly,the regional geological background of the bridge site is studied by remote sensing and geological investigation. On the basis of these studies,geological drilling,in-situ tests,geophysical survey and geotechnical tests are carried out,to identify the characteristics such as stratigraphic lithology, geological structure, rock and soil characteristics,hydrogeology,unfavorable geology,special rock and soil,seismic parameters,site types,site divide of seismic resistance in detail. Based on the comprehensive analysis of the survey achievements,the selection of bearing stratum of bridge foundation,liquefaction of sand,mechanical properties of soft soil,stability and suitability of the bridge site are studied in depth. Research shows that: the site of the bridge is in a relatively stable state,and the engineering geological condition is suitable for the construction of grand bridge.
For identifying the engineering geological and hydro-geological conditions,and seismic effect characteristics of Dongting Lake grand bridge of the newly built Mengxi-Huazhong railway, providing objective,real and accurate geological data,following work has been done. Firstly,the regional geological background of the bridge site is studied by remote sensing and geological investigation. On the basis of these studies,geological drilling,in-situ tests,geophysical survey and geotechnical tests are carried out,to identify the characteristics such as stratigraphic lithology, geological structure, rock and soil characteristics,hydrogeology,unfavorable geology,special rock and soil,seismic parameters,site types,site divide of seismic resistance in detail. Based on the comprehensive analysis of the survey achievements,the selection of bearing stratum of bridge foundation,liquefaction of sand,mechanical properties of soft soil,stability and suitability of the bridge site are studied in depth. Research shows that: the site of the bridge is in a relatively stable state,and the engineering geological condition is suitable for the construction of grand bridge.
引文
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[9]于立波.高密度电法在铁路地下水渗流带探测中的应用[J].铁道勘察,2017(5):63-65.
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[2]朱全宝.芜湖长江大桥地质综合勘探模式研究[J].地球科学(中国地质大学学报),2001(4):343-346.
[3]陈伟.西南某铁路特大桥综合勘察认识[J].铁道工程学报,2011(12):49-53.
[4]柴春阳.金沙江特大桥综合勘察与分析[J].铁道工程学报,2015(4):1-5.
[5]宋章.云桂铁路南盘江特大桥综合勘察及分析评价[J].高速铁路技术,2016(4):83-88.
[6]李昶.综合地质勘察方法在埃塞俄比亚铁路Kench特大桥工程中的应用[J].铁道勘察,2016(4):42-45.
[7] TB10012—2007铁路工程地质勘察规范[S].
[8]孙宝忠.新建铁路荆岳线长江特大桥工程地质条件研究[J].铁道勘察,2013(5):23-27.
[9]于立波.高密度电法在铁路地下水渗流带探测中的应用[J].铁道勘察,2017(5):63-65.
[10]范晨阳.行波及相干效应对超千米跨度斜拉桥多维多点随机地震响应的影响[J].铁道标准设计,2016(8):54-58.
[11]石灿义.沭河铁路特大桥钢围堰施工地质问题分析[J].铁道勘察,2017(2):50-53.
[12]武艺.重庆寸滩长江大桥桥塔横梁施工技术[J].世界桥梁,2017(5):1-5.
[13]赵前进.大瑞铁路澜沧江大桥坡岸稳定性分析[J].铁道标准设计,2017(11):47-50.