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北京地下直径线连接北京铁路枢纽——北京站与北京西客站,全长9 165 m,沿途径由崇文门、前门、和平门、宣武门、长椿街、西便门、天宁寺等,其中隧道长7 120 m(占线路长度的78％)。隧道自崇文门十字街东侧入地,并在崇文门、前门、宣武门分别与规划的南北地铁5号线、8号线、4号线交叉,往西拐至西便门桥、天宁寺桥北侧,斜穿白云路立交桥下至小马场附近出地面。 隧道全部在第四系全新统地层中,崇文门至前门段为粘性土层、砂层、圆砾土层互层;前门以后以卵石土层、圆砾土层为主,夹砂层及粘性土层。围岩等级均为Ⅵ级,地震基本烈度为Ⅷ级。隧道在CK5+480以西的地下水为孔隙潜水,而在CK5+480以东地下水则为孔隙承压水。地下水位埋深约16～17 m,东高西低,西部含水层丰富、颗粒粗、渗透系数大。
Beijing underground diameter line connecting the Beijing Railway Terminal - Beijing Railway Station and Beijing West Railway Station, a total length of 9 165 m, along the route by Chongwenmen, Qianmen, Hepingmen, Xuanwumen, Changchun Street, West Side door, Tianning Temple, etc. The tunnel is 7 120 m long (78% of the line length). The tunnel is to the east of Chongwenmen Cross Street and crossed with the planned North-South Metro Line 5, Line 8 and Line 4 in Chongwenmen, Qianmen and Xuanwumen respectively, and then westward to West Liberation Bridge, Tianning Temple North side of the bridge, oblique crossing Baiyun Road overpass down to the ground near the pony field. All of the tunnels are in Quaternary Holocene Stratum, and Chongwenmen to Qianmen section are cohesive soil layer, sand layer and round gravel soil layer; after the front door, pebble soil layer and round gravel soil layer are mainly used, sand layer and viscosity Soil layer. Surrounding rock grades are Ⅵ level, the basic earthquake intensity Ⅷ level. Groundwater in tunnels to the west of CK5 + 480 is pore-submerged, whereas groundwater in the area to the east of CK5 + 480 is pore-confined water. The groundwater table is buried at a depth of about 16-17 m, high in the east and low in the west, rich in aquifers in the west, coarse in grain size and large in permeability coefficient.