Survey humidification compaction test method for determining swelling soil embankment filling and compaction parameter

Abstract

The invention discloses a survey humidification compaction test method for determining swelling soil embankment filling and compaction parameters, which specifically comprises the following steps of: 1) drilling holes for a survey to obtain the single-hole natural optimum water content of swelling soil; 2) calculating to obtain natural optimum water content; 3) obtaining maximum dry density through a standard heavy-duty compaction test method; 4) judging the nature of filler for road use; and 5) taking the optimum natural water content plus or minus 2 percent as compaction control water content for medium and weak swelling soil filler embankment filling compaction, and using the maximum dry density determined in the step 3 to calculate degree of compaction as a basis for compaction control dry density. By adopting a geological assimilating method, the natural water content corresponding to a soil body with maximum dry density in a natural swelling soil slope is taken as the optimum water content for swelling soil embankment filling compaction. Moreover, a corresponding natural soil body is used for conducting a standard compaction test and the dry density obtained through the compaction test is taken as the maximum dry density for swelling soil embankment filling compaction.

Description

technical field [0001] The invention relates to a method for filling and compacting expansive soil embankments of highways, in particular to a reconnaissance wet compaction test method for determining the filling and compacting parameters of expansive soil embankments. Background technique [0002] Expansive soil is a special soil that contains montmorillonite minerals and has poor engineering properties of water absorption expansion and dehydration shrinkage. It often has the characteristics of high natural water content, high liquid limit and high plastic limit. It cannot be used directly without treatment. Highway embankment filling. However, when the height of the embankment is not large (less than 10m), wrapping measures are adopted, and the medium and weak expansive soil can be directly used for the filling of the lower embankment. Since expansive soil generally has a high natural water content, if the compaction is carried out according to the optimal water content a...

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Problems solved by technology

This also shows that the optimal water content and maximum dry density parameters determined by the conventional compaction test method are not suitable for the compaction of expansive soil embankment filling.