Railway grade: Grade I Railway Standard Design speed: 140km/h, Group A filler (except for sandy soil) shall be used for the surface layer of subgrade bed, the particle size shall not be greater than 150mm, and Group A, B filler or improved soil shall be used for the bottom layer of subgrade bed; The subgrade body shall be filled with group A and B fillers or qualified fillers in group C. The improved earthwork plan is: when the plasticity index of soil layer is lower than 11, the cement soil improvement measures shall be taken, the cement content shall be 5%, and the strength of improved soil shall be greater than 200Kpa; When the plasticity index of soil layer is greater than 11, lime soil improvement measures shall be taken. The lime content shall be 10%, and the strength of improved soil shall be greater than 200Kpa. ... 0.6m of the surface layer of the cutting subgrade bed is replaced by Group A filler. The cutting slopes on both sides are protected by shrub grass. The cutting slopes on both sides are protected by herringbone water intercepting skeleton with shrub grass inside. The main skeleton has a clear distance of 6m, and the branch skeleton has a clear distance of 5m. The right side of the cutting slope is provided with a gravity cutting retaining wall, with a maximum wall height of 6m. The starting and ending walls are 3m high. The wall body is poured with C15 rubble concrete. An expansion joint shall be set every 10~15m along the wall length. 0.3m thick sand pebble inverted filter is continuously set on the back of the wall, and the drain holes of the wall body are arranged in a quincunx shape with a spacing of 2.0m. Precautions for construction of cutting retaining wall: the top of the wall shall be smooth and gradual, and no sharp corner less than 135 ° shall appear. During construction, the slope at the top of the wall must be cleaned according to the design slope rate, and then the temporary slope at the back of the wall must be excavated. It is required that the retaining wall should be poured in time after the slope excavation. The exposure time of the slope should not exceed 15 days, and the construction in rainy season should be avoided as far as possible. The retaining wall must be excavated in sections and poured in time. The length of each section should not be more than 10~15m. During construction, it is strictly prohibited to accumulate a large number of concentrated loads on the edge of the cutting top and the slope platform. See the detail drawing for specific dimensions ...... 63 sheets in total
