【文章內(nèi)容簡介】 sical properties to be different. Therefore, to change the characteristics of soil, and the change from the start. Soil paction, is by mechanical means to change the soil structure, to improve soil base of strength and stability.Earth paction effect of internal factors of soil moisture content and main is nature, external factors have paction function, paction methods and tools, etc.1 paction effect of moisture（1）water is the decisive factor of paction effect,2 when the optimum moisture in the soil, which is hard plastic state, the most easily get the best paction effect,3 the soil pressure ShiDao best density water stability.For soil paction effect(1) the different soil types are different optimum moisture and maximum dry density,2 higher (liquidlimit high dispersion viscosity, the soil, the larger), the absolute best content of absolute maximum dry density and lesser,3 the sand and clay paction of good performance (ρ c ) and cohesive soil paction of poor performance (ρ ) c.paction of paction effect functionThe same kind of soil paction function with the best content decreased, while the maximum dry density function with the paction increases, When the moisture content must, when the paction function is higher density, When the paction increases to a certain function, soil paction degree is not significantly increased, it shows that, for a certain kind of soil, if exceeds a certain extent, in which the paction increases the way to improve soil paction degree is not economical.paction tools and methods for paction effect(1) the paction tools, how effective pressure transmission is different also. Research shows that, after the pressure of machines, vibrationtype transmission deepest, most shallow rolling type.2 the paction machine, load weight more hours long, soil paction degree is higher, but the rate of growth of density decreases with increase of time, paction machine is heavier, soil paction degree was increased with increasing unloading time quickly, but more than a time limit of soil deformation, destruction will increase sharply and achieve, Machines that exceed the soil heavy intensity limit, will cause the soil.3 the higher speed roller paction effect.Currently, generally USES the roadbed construction of largetonnage roller (less than), the road roller upwardleading continuous to center on both sides, until the surface of the wheel track without obvious, follow after the first light weight, low vibration, the first after stability after the first slow, quick, high, the principle of the wheel, paction effect of overlap has been improved. To improve the subgrade soil paction degree on the good effect. Rules and regulations and highway pavement under the bottom 80 more on the part of the subgrade paction degree of other must 94%, senior level road paving road, when the paction degree also should press expressway and the level of roads by the standard. In addition, also increases the base of subgrade paction degree should not be less than 93% of regulation. As a main road in the west of highway construction, secondary specialized standard for senior road pavement design, from the beginning, all roadbed inspection standards adopted grade highway acceptance criteria.special damp area of subgrade soil pactionIn special areas damp, the roadbed paction is very difficult to make some adjustment standard: one is the degree of paction test data can be determined according to the standard list or lower numerical reduce 23 percentage points, Two is less than , natural consistency for more than 40 liquidlimit, plastic index of more than 18, when used in goo soil under the bed and road embankment packing, can adopt prescribed light pacted standards, Three is to improve the packing in soil properties, adding lime, usually can get the desired effect, also can use new bibulous. As in the line extensions to JiMo section expressway haiyang construction contract, the five gravel mixed filling method has achieved remarkable results.loess embankment filling and paction.1 loess embankment construction, should make the bination fill amp。excavation interface (vertical), remove weeds, slope dug in the steps to tilt. As with vertical surfaces, unable to dig into the steps, can be used to strengthen nails with geotextile. If the foundation soil with strong sex or higher collapsible bearing, and allow the pressibility than embankment selfrespect, can consider to use heavy hammer, mat, laying geotextile between gravel pile and lime pile pacting reinforcement..2 loess moisture content is too small, should add uniform any rolling, If too much, can turn loose moisture content to air again, can also adding lime treatment, reduce moisture. After the ash content should be well, ash, the maximum dry density should be determined by the paction test.3 old loess, poor permeability is wet, large soil crushed before use, not be decided by experiment. Road bed packing shall use the old loess. The new packing for the good of loess, can be used for filling road bed. The loess embankment should be layered rock, stratification, paction, the block 10cm must be broken, and shall be in close on the paction optimum moisture when rolling.4 according to build on the edge of the lateral design timely LanShui, cut ditch installations and rushing water trough, will lead to the slope of feet, the embankment height than 20m, should according to the design pressure after the pletion of the reserve of embankment sinking of dense consolidation is pressed.loess areas should pay special attention to road surface drainage, interception, should adopt decentralized, seepage, far far sent up according to the design principle, timely to prehensive drainage facilities, will quickly lead from water roadbed. Fill amp。excavation border drawn in the gutter, should make the outlet of the water.and roadbed drainageWater is the impact strength and stability of road embankment and the service