北京西部地区新生代天坛组及长辛店组基岩工程特性及对轨道交通建设的影响分析

Engineering properties of Cenozoic Tiantan and Changxindian Fm bedrock in Beijing West and analysis on their influence to rail transit construction

介绍了北京西部地区新生代基岩的物理力学特性,并以穿越该地区的北京地铁9号线、14号线及轨道交通房山线建设过程中涉及到的新生代粘土岩、砾岩试验测试成果及工程经验为基础,分析比较了该地区新近纪天坛组及古近纪长辛店组基岩属于半成岩、软岩及膨胀岩的特征,并结合该地区轨道交通建设工程实践,对其作为隧道围岩、边坡岩体、地基持力层及桩端持力层等的工程特性进行了分析研究,对其对桩基及盾构施工设备及工艺选择的影响进行了分析评价。

The physical and mechanical properties of the Cenozoic bedrock in Beijing west are introduced.Combining the testing results of the Cenozoic clay rock and conglomerate obtained from the metro construction of subway Line 9,Ling 14 and Line Fangshan,the engineering properties of the Neogene Tiantan Fm and the Paleogene Changxindian Fm bedrock are analyzed and compared,which are soft,swelling and semi-rock.The engineering influences as the wall rock,the slope rock mass or the bearing stratum are assessed,and the selections of the technique and equipment for the pile construction and tunnel construction are evaluated according to the engineering practice.