Construction technology and requirements \x0d\ (1) Packing paving construction \x0d\( 1) Setting-out: the sideline shall be filled in the line and nailed every 20m. In order to ensure the compactness of subgrade edge, the edge of embankment section should be 30cm wider than each side of design line. \x0d\(2) Drawing of grid: Within the effective filling range, draw a grid with a height of 5m×6m with white plaster, so that the site construction personnel can direct the vehicles to dump the filler in turn. \x0d\(3) Controlling the loose laying thickness: According to the volume of each dump truck and the loose laying thickness of 40cm, calculate the number of dump trucks in each square, so as to control the loose laying thickness of the filler. \x0d\(4) Spread bulk materials with bulldozers, and at the same time, manually level and supplement local materials with machinery. \x0d\(5) Controlling the water content of the filler According to the indoor test of the filler, the construction water content of the filler is controlled above the optimal water content of 65438 0%. When the water content of the filler is low, water spraying measures should be taken; When the water content of the filler is too high, turn it loose and dry it. \x0d\ (2), mechanical leveling \x0d\( 1) rough leveling: after the filler is filled, use bulldozer to rough leveling. In order to ensure the leveling of each layer and the uniformity of construction thickness, the construction elevation should be constantly checked in peacetime. In addition, (2 ~ 4)% herringbone cross slope must be formed when filling each layer. \x0d\(2) Fine leveling: After coarse leveling is completed, fine leveling will be carried out with a grader. \x0d\(3) Settlement treatment: Aggregate is prone to settlement during paving and leveling, and the following measures should be taken to deal with it: First, grid discharge. Secondly, in the process of paving, arrange a small excavator to mix the filler with poor local gradation on site to improve the gradation. Thirdly, local aggregate nested parts are mixed manually on site. \x0d\ (3) After the mechanical rolling \x0d\ leveling is completed, the on-site technicians shall conduct testing and confirm that the elevation and smoothness of the filling layer meet the requirements before rolling. \x0d\( 1) rolling combination: BMW roller is used for rolling for 6 times, and the rolling combination mode is static pressure 1 pass+weak vibration for 2 times+strong vibration for 2 times+static pressure 1 pass. Compaction sequence should be carried out according to the operation procedure of first two sides and then the middle, first static pressure, then weak vibration, and then strong vibration. The running speed of the roller is 2.5km/h \ x0d \ 2) Shaping: when the surface is still wet, it will be rolled immediately. If the surface water evaporates a lot, and it is obviously dry and loses water, spray a proper amount of water on the surface and then roll it. Straight line segment, rolling from shoulders on both sides to road center; In the bending part, roll from the inner shoulder to the outer shoulder. The compaction overlap between longitudinal rows along the line should not be less than 40cm, the compaction length of longitudinal overlap at the junction of each section should not be less than 2m, and the staggered joint between the upper and lower layers should not be less than 3.0 m ... \ x0d \ Dig and fill the filler at the transverse joint and mix it evenly with the newly paved filler before rolling, and pay attention to adjusting its water content to avoid working joints in the longitudinal direction. After rolling, the bed surface appearance quality meets the design requirements. If the local surface is uneven, water should be sprayed to make it flat. \x0d\ (4), test detection \x0d\ Before sampling or testing, the tester must check whether the filler meets the requirements, whether the rolling section is compacted evenly, and whether the thickness of the filling layer exceeds the specified thickness. Compaction quality inspection of subgrade filler should be carried out by layers, filling by layers and rolling construction. Including the test of foundation coefficient, dynamic deformation modulus and porosity. The porosity of the bottom layer of subgrade bed of cutting and embankment shall be sampled and tested at 6 points per 100m of each compacted layer along the longitudinal direction, including 2 points on the left and right sides of two sections from the shoulder sideline 1m and 2 points in the middle of subgrade; Every 100m and every 90cm fill height, four points, namely, foundation coefficient K30, dynamic deformation modulus EVd and deformation modulus EV2, are randomly sampled, including 1 point about 2m away from the subgrade boundary and two points in the middle of subgrade. After the compaction quality of each layer of subgrade meets the design and specification requirements according to regulations, the next layer of subgrade can be filled only after it is confirmed by the supervisor to be qualified, otherwise it should be compacted again until it is qualified. The following is the construction process flow chart \x0d\ (5) subgrade settlement deformation monitoring and control scheme \x0d\ According to the design requirements, intelligent digital monitoring elements with little interference to the construction and no measuring rod are buried, and monitoring data management software is compiled, which is automatically managed and stored by the computer, basically realizing the preliminary analysis function. Establish a precise control network as an important observation point for the observation of settlement deformation of auxiliary components, settlement plates and piles on the subgrade surface. Settlement observation adopts second-class leveling, and the observation accuracy is not lower than1mm. Subgrade deformation monitoring is divided into four stages. The first stage: monitoring in the process of subgrade filling, mainly monitoring subgrade settlement and pile displacement at the toe of embankment during subgrade filling, and controlling the filling rate; The second stage: deformation monitoring during natural settlement period and surcharge preloading period after subgrade filling, until the settlement analysis after construction meets the requirements of ballastless track laying. At present, the modified hyperbola method and three-point method are generally used to calculate the final settlement by using the measured data. According to the specific situation and fitting degree of the construction site, the method that is more in line with or close to the actual situation of the project is selected to calculate the final settlement, post-construction settlement and settlement rate. The third stage: monitoring in the construction process of laying ballastless track; The fourth stage: monitoring after laying the track.