Bian Xiao made an inquiry through the architectural knowledge column of "Construction Network", an encyclopedia website of the construction industry. Relevant contents of subgrade fill slope are as follows:
When rolling foundation and road foundation are constructed on site, the overall planning and construction of temporary drainage during construction should be done well. Temporary drainage facilities should be comprehensively considered with permanent drainage facilities and coordinated with the natural drainage system within the scope of the project.
Relevant provisions of subgrade fill slope:
1) Fillers with different properties shall be layered horizontally, filled in sections and compacted by layers. The same filler should be used for the whole width of the foundation of the same horizontal layer, and mixed filling is not allowed to avoid uneven settlement due to uneven bearing capacity in the process of engineering use. The continuous thickness of compacted filling layer of each filler should not be less than 500mm, so as to improve the overall effect. When filling the last layer on the top surface of subgrade, the compaction thickness shall be no less than100 mm.
2) The upper part of subgrade shall be filled with fillers with low sensitivity to moisture or freeze-thaw. The filler with less strength should be filled in the lower layer. In the area with groundwater or in the subgrade near water, it is advisable to fill the filler with good water permeability.
3) Before filling filler with good water permeability on the compacted layer with poor water permeability, 2 ~ 4% of two-way cross slope should be set on its surface, and corresponding waterproof measures should be taken. On embankment slopes filled with fillers with good water permeability, fillers with poor water permeability shall not be covered.
4) The loose laying thickness of each filler shall be determined through tests.
5) The compaction width of each layer of packing shall not be less than the design width.
6) When the foundation is filled, it should be filled in layers from the lowest place and compacted step by step; When the longitudinal slope of the original ground is greater than 12% or the transverse slope is steeper than 1:5, steps shall be dug according to the design requirements, or steps with inward slope greater than 4% and width greater than 2m shall be set.
7) During the construction of filling in several sections, if the joint parts cannot be filled alternately, the filling should be done in sections first, and the steps should be left in layers according to the gradient of 1: 1; If it can be filled alternately, it should be overlapped alternately by layers, and the overlapping length should be not less than 2m.
8) When selecting construction machinery, factors such as engineering characteristics, type and quantity of earthwork, topography, filling and excavation height, transportation distance, climatic conditions, construction period, etc. should be considered and determined economically and reasonably. Fill compaction should be equipped with special rolling machinery.
9) The compactness of soil subgrade shall comply with the provisions of design documents.
Relevant provisions of subgrade fill slope:
1) before foundation construction, a test section should be built to determine the loose laying thickness, the type and combination of compaction machinery, the compaction speed and times, the bad settlement and other parameters that meet the specified porosity standards.
2) Before subgrade construction, the test section should be built to determine the loose paving thickness, the type and combination of compaction machinery, the compaction speed and times, and the bad settlement that can reach the maximum compaction dry density.
Fillers with different lithology should be filled in layers or sections. It is forbidden to mix soft stone with hard stone.
3) Compaction machinery should choose vibrating roller with dead weight not less than 18t.
4) A transition layer shall be set between the top surface of the rock-filled embankment and the fine-grained soil filler layer according to the design requirements.
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