CN102561134B - Compaction method for embankment filling under high liquid limit red clay according to equilibrium moisture content - Google Patents
Compaction method for embankment filling under high liquid limit red clay according to equilibrium moisture content Download PDFInfo
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- CN102561134B CN102561134B CN 201210004290 CN201210004290A CN102561134B CN 102561134 B CN102561134 B CN 102561134B CN 201210004290 CN201210004290 CN 201210004290 CN 201210004290 A CN201210004290 A CN 201210004290A CN 102561134 B CN102561134 B CN 102561134B
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Abstract
The invention discloses a compaction method for embankment filling under high liquid limit red clay according to the equilibrium moisture content. The method includes the following steps of (1) obtaining the equilibrium moisture content of the high liquid limit red clay in a construction section through a drilling exploration method; (2) working out balance dry density by means of a standard heavy compaction test method; (3) judging road application properties of fillings; and (4) performing constructions of filling and compaction of a high liquid limit red clay subgrade according to standardrequirements with +/-2% of the equilibrium moisture content serving as the compaction controlling moisture content of the high liquid limit red clay subgrade and with a compaction controlling dry density which is no lower than 0.95 time of the balance dry density. The compaction method of the high liquid limit red clay embankment filling based on a theory of the equilibrium moisture content is provided. By means of the method, the construction of compaction of the high liquid limit red clay is performed, the embankment strength is guaranteed to meet the requirements, the humidity and the density of post-construction embankment soil are guaranteed to be more adapted to the environment and weather, moisture content of the fillings is easily reduced, the compaction is easy, difficulty of thecompaction construction is greatly lowered, and time and labor are saved.
Description
Technical field
The present invention relates to the debulking methods of embankment under a kind of highway high liquid limit soil, particularly relate to a kind of debulking methods that carries out embankment under the high liquid limit admaic earth by equilibrium moisture content.
Background technology
High liquid limit soil is a kind of liquid limit greater than 50% special great soil group, often has higher natural moisture content, often belongs to the over-wet soil class.Admaic earth is a kind ofly mainly to remain great soil group by what the weathering such as limestone, argillaceous limestone formed, is distributed widely in the south China each province, often has the engineering and geological feature of soils of high liquid limit, high plastic limit and high natural moisture content, and therefore, admaic earth usually also is a kind of high liquid limit soil.For roadbed filling, high liquid limit admaic earth is a kind of bad nature of soil, it mainly is that the compacting high liquid limit soil admaic earth soil body easily shrinks distortion, at the serious shrinkage cracking of the normal generation of construction compacted lift, cracking destruction the globality of roadbed, and easily cause roadbed side slope behind the worker the shoulder that collapses, slip and collapse and and the diseases such as surface deformation, lobe.Because limestone is widely distributed at south China, the limestone weathering form residual soil---admaic earth also is widely distributed, for taking full advantage of the high liquid limit soil admaic earth, the bound edge measure of the comparatively economic environmental protection of normal employing is punished, when adopting the bound edge measure, high liquid limit admaic earth can be used as fill out core soil directly compacting fill in lower embankment position.At present, the method for high liquid limit admaic earth direct filling compacting is still adopted general soil compaction method, i.e. employing standard is hit the solid yardage method and is determined the compacting parameter.But hit the compacting construction that optimum water content that real experimental technique determines and maximum dry density parameter are carried out the high liquid limit soil admaic earth by standard, often have two problems, the one, be difficult to high liquid limit admaic earth is down to optimum water content from high natural moisture content; The 2nd, when optimum water content, also be difficult to compacting and reach compacting requirement.For this reason, the existing Highway Roadbed Construction Technology standard (JTG-2006) of China is pointed out, can adopt the compacting construction of carrying out admaic earth than the degree of compaction standard reduction by 1%～5% of general dirt road dike by local soil test result.Practice shows, reducing degree of compaction standard, to carry out the compacting of high liquid limit admaic earth embankment still more much more difficult than general soil compaction, in addition, standard does not clearly reduce the concrete grammar of degree of compaction, this still exists compacting criteria to be difficult to difficulty definite and the compacting construction so that fill high liquid limit red clay subgrade with the bound edge method, therefore the high liquid limit admaic earth of many excavations utilization side also goes out of use, fill and adopt borrow earth to change, thereby increased the weight of the soil erosion in highway construction district and highway construction to the destruction of natural environment.It is not to be suitable for High liquid limit soil embankment to fill compacting that real experimental technique definite optimum water content and maximum dry density parameter are hit in this explanation, routine, but does not have at present a kind of debulking methods that better is suitable for embankment under the high liquid limit soil admaic earth.
Summary of the invention
Technical problem to be solved by this invention provide a kind of can guarantee that embankment intensity meets the demands and the worker after the humidity of embankment soil and density and amblent air temperature more adapt to, be easy to again reduce the water content of filler and be easy to compacting, greatly reduce the compacting difficulty of construction, the time and labour saving carry out the debulking methods of embankment under the high liquid limit admaic earth by equilibrium moisture content.
In order to solve the problems of the technologies described above, the invention provides the debulking methods that carries out embankment under the high liquid limit admaic earth by equilibrium moisture content, its step is as follows:
(1), asks for the equilibrium moisture content of the high liquid limit admaic earth of construction section by boring prospecting method;
(2), ask the balance dry density by standard modified compaction test method: get respectively the 7 groups high liquid limit admaic earth earth materials that natural moisture content equates with described equilibrium moisture content (EMC), equates with equilibrium moisture content (EMC) ± 2%, equates with equilibrium moisture content (EMC) ± 4% and equates with equilibrium moisture content (EMC) ± 6%, carry out compaction test according to standard modified compaction test method, the high value point of getting high dry density section and low dry density turn section in the tamping curve is the balance dry density;
(3), differentiate the road application properties of filler: California Bearing Ratio (CBR) test is carried out in the natural high liquid limit admaic earth earth material sample preparation of (EMC) to take to have equilibrium moisture content, the California Bearing Ratio of testing (CBR) value more than or equal to 3% the time, then by step (4) with high liquid limit admaic earth direct filling embankment, if the California Bearing Ratio of testing (CBR) value less than 3% the time, then need adopt and mix gravel or mix lime, cement is processed or adopt the bound edge method to process;
(4), the compacting take equilibrium moisture content (EMC) ± 2% as high liquid limit red clay subgrade is controlled water content and is controlled dry density take the 0.95 times of value that is not less than the balance dry density as compacting and construct by the compacting of filling that code requirement carries out high liquid limit red clay subgrade.
The boring prospecting method of passing through described in the above-mentioned steps (1) is asked for the equilibrium moisture content of the high liquid limit admaic earth of construction section and referred to: two above representative sections are chosen respectively on natural high liquid limit admaic earth slope in same highway section, arrange respectively a boring at the Po Ding of each section, sloping waist and toe, hole depth is more than 6 meters; In each boring, deeply take a soil sample every 0.4～0.6 meter, in indoor natural moisture content, liquid limit and the plastic limit of measuring soil sample by soil test; Make the natural moisture content of each boring with the curve of change in depth, get section preset value that interior data are calculated as this boring equilibrium moisture content of the natural moisture content value of tending to balance, ask the average of equilibrium moisture content calculating preset value in each hole, ask the average of all these averages of holing, this value is the equilibrium moisture content (EMC) of the high liquid limit admaic earth in this highway section again.
Carry out the direct filling compacting of high liquid limit admaic earth embankment by current practice, need with tedding the natural moisture content (W of method with high liquid limit admaic earth
0) be reduced to optimum water content (W
Opt).Because the natural moisture content (W of high liquid limit admaic earth
0) generally between 28%～35%, hit routinely the optimum water content (W that the solid yardage method obtains
Opt) be everlasting between 13%～17%, and adopt technique scheme provided by the invention, and namely carrying out the debulking methods of embankment under the high liquid limit admaic earth by equilibrium moisture content, the equilibrium moisture content (EMC) of measuring of pressing is everlasting between 22%～28%.As seen, equilibrium moisture content (EMC) is near the natural moisture content (W of high liquid limit admaic earth
0) but than optimum water content (W
Opt) high a lot.Therefore, when carrying out high liquid limit admaic earth embankment direct filling compacting by the inventive method, only need the natural moisture content (W with high liquid limit admaic earth
0) be reduced to equilibrium moisture content (EMC) and can finish and ted the precipitation operation, this is just so that by the advantage that compacting construction method has the water content of easy reduction filler of filling of high liquid limit admaic earth embankment provided by the invention; Again because high liquid limit admaic earth has high liquid limit (W
l), high plastic limit (W
p), equilibrium moisture content (EMC) is than optimum water content (W
Opt) more near plastic limit (W
p), the soil body is in hard state near hard plastic and is easy to compacting; By test CBR value more than or equal to 3% requirement, guaranteed that carrying out high liquid limit admaic earth embankment with this law can satisfy the subgrade strength requirement, simultaneously, equilibrium moisture content and balance dry density and climatic environment more adapt to, but the embankment swell-shrinking deformation that reduce causes because of the Climate Dryness/Wetness effect.In a word, adopt the inventive method to carry out the direct filling of embankment under the high liquid limit admaic earth, be easy to reduce water content and be easy to compacting with the method that teds, greatly reduce construction compacting difficulty and compacting operating expenses, thereby be conducive to increase the actual utilization of high liquid limit admaic earth in embankment, reduce highway construction to the destruction of natural environment, therefore, the present invention is a kind of method with better economic benefits and environmental protection effect.
In sum, the present invention proposes a kind of debulking methods of the high liquid limit admaic earth embankment based on the equilibrium moisture content theory, use the method to carry out the compacting construction of high liquid limit admaic earth, can guarantee that embankment intensity meets the demands and the worker after the humidity of embankment soil and density and amblent air temperature more adapt to, be easy to again reduce the water content of filler and be easy to compacting, greatly reduce the compacting difficulty of construction, the time and labour saving.
Description of drawings
Fig. 1 is that soil body natural moisture content is with change in depth curve map 1.
Fig. 2 is natural moisture content tamping curve Fig. 2.
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Observation to water content behind the roadbed worker of southern high liquid limit soil shows that by the High liquid limit soil embankment that optimum water content is filled, through the Climate Dryness/Wetness ringing more than 4～5 years, subgrade moisture content generally can improve, sometimes even reach more than 8%.Relatively general great soil group, natural high liquid limit admaic earth still has larger shear strength and lower compressibilty when having higher moisture.Different domatic positions, natural high liquid limit admaic earth slope are tested different depth soil body natural moisture content in same highway section, always can obtain behind the certain depth of earth's surface, natural moisture content can be tending towards the result of an equilibrium valve, and this equilibrium valve can be referred to as equilibrium moisture content (EMC).Further studies show that, adopt the high liquid limit soil of different natural moisture contents to carry out standard compaction test (soil sample that comprises equilibrium moisture content), the soil sample that described equilibrium moisture content is corresponding can obtain relatively large dry density, and this dry density value can be referred to as the balance dry density.5～August in 2011, to 600 meters between the speedway K6～K7 of Haikou to Tunchang long embankment sections, replacing optimum water content that standard compaction test obtains and maximum dry density with equilibrium moisture content and balance dry density carries out High liquid limit soil embankment and fills the compacting construction test, the result shows, compacting construction method based on equilibrium moisture content and balance dry density, both be easy to reduce the water content of filler and be easy to compacting, and can have guaranteed that again embankment intensity met the demands.Because equilibrium moisture content and balance dry density more adapt to the local climate environment, cause that because of the weather effect variation of soil body humidity also will be seldom behind the expectation worker.Therefore, the present invention proposes and a kind ofly carry out the compacting construction method of embankment under the high liquid limit admaic earth by equilibrium moisture content, concrete steps are as follows:
(1), ask for the equilibrium moisture content of the high liquid limit admaic earth of construction section by boring prospecting method: two above representative sections are chosen respectively on natural high liquid limit admaic earth slope in same highway section, arrange respectively a boring at the Po Ding of each section, sloping waist and toe, hole depth is more than 6 meters; In each boring, deeply take a soil sample every 0.4～0.6 meter, at the indoor natural moisture content, liquid limit, plastic limit of measuring soil sample by soil test etc.; Make the natural moisture content of each boring with the curve of change in depth, get section preset value (referring to Fig. 1) that interior data are calculated as this boring equilibrium moisture content of the natural moisture content value of tending to balance, ask the average of equilibrium moisture content calculating preset value in each hole, ask the average of all these averages of holing, this value is the equilibrium moisture content (EMC) of the high liquid limit admaic earth in this highway section again;
(2), ask the balance dry density by standard modified compaction test method: get respectively the 7 groups high liquid limit admaic earth earth materials that natural moisture content equates with described equilibrium moisture content (EMC), equates with equilibrium moisture content (EMC) ± 2%, equates with equilibrium moisture content (EMC) ± 4% and equates with equilibrium moisture content (EMC) ± 6%, carry out compaction test according to standard modified compaction test method, the high value point of getting high dry density section and low dry density turn section in the tamping curve is balance dry density (referring to Fig. 2);
(3), differentiate the road application properties of filler: California Bearing Ratio (CBR) test is carried out in the natural high liquid limit admaic earth earth material sample preparation of (EMC) to take to have equilibrium moisture content, the California Bearing Ratio of testing (CBR) value more than or equal to 3% the time, then by step (4) with high liquid limit admaic earth direct filling embankment, if the California Bearing Ratio of testing (CBR) value less than 3% the time, then need adopt and mix gravel or mix lime, cement is processed or adopt the bound edge method to process;
(4), the compacting take equilibrium moisture content (EMC) ± 2% as high liquid limit red clay subgrade is controlled water content and is controlled dry density take the 0.95 times of value that is not less than the balance dry density as compacting and construct by the compacting of filling that code requirement carries out high liquid limit red clay subgrade.
Claims (2)
1. one kind is carried out the debulking methods of embankment under the high liquid limit admaic earth by equilibrium moisture content, and its step is as follows:
(1), asks for the equilibrium moisture content of the high liquid limit admaic earth of construction section by boring prospecting method;
(2), ask the balance dry density by standard modified compaction test method: get respectively the 7 groups high liquid limit admaic earth earth materials that natural moisture content equates with described equilibrium moisture content, equates with equilibrium moisture content ± 2%, equates with equilibrium moisture content ± 4% and equates with equilibrium moisture content ± 6%, carry out compaction test according to standard modified compaction test method, the high value point of getting high dry density section and low dry density turn section in the tamping curve is the balance dry density;
(3), differentiate the road application properties of filler: California bearing ratio test is carried out in the natural high liquid limit admaic earth earth material sample preparation of taking to have equilibrium moisture content, the California Bearing Ratio value of testing more than or equal to 3% the time, then by step (4) with high liquid limit admaic earth direct filling embankment, if the California Bearing Ratio value of testing less than 3% the time, then need adopt and mix gravel or mix lime, cement is processed or adopt the bound edge method to process;
(4), the compacting take equilibrium moisture content ± 2% as high liquid limit red clay subgrade is controlled water content and is controlled dry density take the 0.95 times of value that is not less than the balance dry density as compacting and construct by the compacting of filling that code requirement carries out high liquid limit red clay subgrade.
2. the debulking methods that carries out embankment under the high liquid limit admaic earth by equilibrium moisture content according to claim 1, it is characterized in that: the boring prospecting method of passing through described in the above-mentioned steps (1) is asked for the equilibrium moisture content of the high liquid limit admaic earth of construction section and referred to: two above representative sections are chosen respectively on natural high liquid limit admaic earth slope in same highway section, arrange respectively a boring at the Po Ding of each section, sloping waist and toe, hole depth is more than 6 meters; In each boring, deeply take a soil sample every 0.4～0.6 meter, in indoor natural moisture content, liquid limit and the plastic limit of measuring soil sample by soil test; Make the natural moisture content of each boring with the curve of change in depth, get section preset value that interior data are calculated as this boring equilibrium moisture content of the natural moisture content value of tending to balance, ask the average of equilibrium moisture content calculating preset value in each hole, ask the average of all these averages of holing, this value is the equilibrium moisture content of the high liquid limit admaic earth in this highway section again.
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| CN102943423A (en) * | 2012-11-20 | 2013-02-27 | 中铁十九局集团第三工程有限公司 | Construction technology for clay roadbed with high liquid limit |
| CN104631253A (en) * | 2013-11-08 | 2015-05-20 | 五冶集团上海有限公司 | Improvement and filling method of red clay subgrades at zone 94 and zone 96 of highway |
| CN108611953B (en) * | 2018-05-04 | 2020-06-09 | 长沙理工大学 | Compaction control method for over-wet soil subgrade |
| CN109580420B (en) * | 2018-12-07 | 2021-08-10 | 安徽建工集团控股有限公司 | High liquid limit soil filling water content control method |
| CN110777608B (en) * | 2019-12-03 | 2023-08-15 | 长沙理工大学 | Highway embankment over-wet filling material turning and baking device and use method thereof |
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| CN101761009A (en) * | 2010-01-21 | 2010-06-30 | 广东省长大公路工程有限公司 | Construction method for lowering construction compactness requirement of high-liquid-limit soil subgrade construction by doping sand |
| CN101962928B (en) * | 2010-08-12 | 2013-03-27 | 中铁二十二局集团第一工程有限公司 | Construction method for processing aeolian sand roadbed base through impacting and grinding |
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