Guidepost determination method and rolling and compacting technology for rolling of high liquid limit clay road embankment in yellow river flood area

Abstract

The invention discloses a guidepost determination method and a rolling and compacting technology for rolling of a high liquid limit clay road embankment in the yellow river flood area. Economical and efficient soil moisture content and compacting degree guideposts are proposed based on the physical mechanical properties of the high liquid limit clay in the yellow river flood area: the target moisture content range in the filling road embankment area is from the optimum moisture content W<opt>-2% to W<opt>+6%, and the compacting degree is not lower than 88%; in order to reach the guidepost, soil sampling and sun-curing of road embankment filling are organized reasonably and orderly, the compacting technology that a smooth-wheel roller suitable for a clay road embankment conducts static compacting for one time, a cam roller conducts strong vibration for four times and a rubber-tyred roller conducts surface finishing for one time is adopted, the compacting quality of the road embankment is improved obviously, the compacting strength of the road embankment is improved, and the problems that construction of the high liquid limit clay road embankment is difficult in rolling and compacting and the filling guidepost is not clear are solved. The filling guidepost determination method is economical, rapid and obvious in compacting effect, and has wide application prospects on filling of the high liquid limit clay road embankment.

Description

technical field [0001] The invention relates to the technical field of high liquid limit clay embankment filling, in particular to a method for determining the target moisture content and compaction degree of fillers and a construction process applicable to the filling process of high liquid limit clay embankment in yellow flooding areas. Background technique [0002] The high-liquid-limit clays deposited in lakes in the middle and lower reaches of the yellow flood zone formed by the long-distance transportation of the Yellow River are widely distributed in the northwestern and southwestern regions of Shandong and Shandong. They are mainly composed of silt and clay, and there is basically no coarse-grained soil. Among them, the content of silt is the highest, accounting for 65.5-72.2%, followed by the content of clay, accounting for 22-36.3%. The silt content is between the silt in the yellow flood zone and the clay with high liquid limit in the south. Although the silt in t...

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Problems solved by technology

[0004] Aiming at the problems of extreme lack of fillers, high initial moisture content of high liquid limit clay and soil performance indicators not meeting the filling requirements stipulated in the code during the filling process of subgrade in yellow flooding areas, the present invention proposes a high liquid limit clay embankment in yellow flooding areas The method of determining the target moisture content and compaction degree of filling soil and the physical rolling process, under the premise of ensuring the strength, stiffness and stability of the embankment, adopt economical and efficient soil moisture content and compaction degree control indicators, and adopt The rolling process of 1 pass of static pressure with slick wheel roller - 4 passes of strong vibration with cam roller - 1 pass of surface closing with rubber wheel roller, rationally utilizes the high liquid limit clay in the yellow flood zone and solves the problem of difficult rolling of high liquid limit clay subgrade construction, Significantly reduce project cost

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