[Jiangsu] Railway Tunnel Construction Organization Design
2、 Project overview: 1. Technical standard: 1. Railway grade: Grade I 2. Number of main lines: double track 3. Limiting gradient: 6 ‰ 4. Design running speed of passenger train: 200km/h; The distance between main lines (4. 6m), gauge, bridge and culvert, tunnel structure reserve the condition of 250km/h speed increase; The design speed of freight cars shall not exceed 120km/h. 5. Minimum curve radius: 4500m 6. Traction type: electric 7. Locomotive type: multiple units 8. Traction mass: 4000t 9. Effective length of arrival departure track: 850m, 1050m reserved 10 Blocking type: automatic blocking 11. Construction clearance: meet the conditions for running a double deck container train 2. Natural characteristics such as terrain, landform, geology, climate, hydrology, etc., engineering characteristics 1. Low hills, vegetation development, mostly trees, natural slope is generally 25-40 degrees. 2. Engineering geology and hydrogeology surface el+dlQ silty clay, brown yellow, hard plastic, 0~1.0m thick, σ 0=180kpa. The bedrock is mostly exposed, mainly composed of Z3d2 crystalline limestone, which is greenish gray and dark gray, with joint fissures developed, calcite veins interspersed, hard lithology, weakly weathered, locally mixed with grayish yellow fine sandy mudstone, strongly weathered, 310 - 325 °∠ 20 - 500 °; It is locally Z3d1 phyllite, carbonaceous shale mixed with coal seam, carbonaceous limestone and Z2S gravel bearing phyllite, phyllite, grayish green, grayish yellow, strongly weathered~weakly weathered. The groundwater is bedrock fissure water, with a buried depth of 5~9M, which is a groundwater deficient area.
