Solution for the number of degree of soil compaction Discussion

Transcription

1 Solution for the number of egree of soil compaction Discussion Jia - Zhen Feng Hyro One People's Arme Police Corps Nanning, Guangxi China ,jzf805@126.com Abstract:In this paper, the optimal soil moisture content an construction of China an Turkey is expecte compaction moisture poor, converte to soil compaction unit volume nee to a the volume of water, an then compacte soil ry ensity (per unit volume of soil quality) for replacement of compacte soil ry ensity compensation, so as to arrive at compaction of soil maximum ry ensity, on-site without test or three-click test, can greatly improve the efficiency of construction. Key wors:math solution;maximum ry ensity;dry ensity compensation optimal;moisture content; Discussion 1 Preface Commonly use in civil engineering as a egree of compaction of soil compaction quality control inicators, an the egree of compaction is the construction of soil an soil compaction ry ensity of the maximum ry ensity ratio of the percentage, so how to etermine the soil's maximum ry ensity for pressure it's ifficult. Traitional metho is to use 5 clicks is law, but it is the law of 5 clicks maximum ry ensity an ry ensity construction with a non-ientity, often greater than 100% egree of compaction of the situation, the three-click metho is also known as Hilf rapi control metho, although the moisture content nees to be one, but one uner the three moisture content test, heavy workloa, ifficult to unerstan, maximum ry ensity is not necessary to obtain accurate search, a number of solutions (ry ensity of Compensation) Act only nee to know the optimal soil moisture content an fiel moisture content an wet ensity, faster an more accurate, never will be greater than 100% egree of compaction of the situation, oes not affect the construction scheule 2 Maximum ry ensity metho (traitional metho) 2.1 Click Five is the Law Base on soil moisture content in ifferent ry ensity changes uner the curve rawn, the highest point on the curve is the maximum ry ensity, moisture content corresponing to the 1

2 optimal moisture content. Traitional approach is to estimate the optimal moisture content, optimum moisture content an then +2%, +4% an -2% optimum moisture content, -4%, respectively, so the preparation of soil samples test 2.2 Three-click metho Three-click metho is rapi Hilf control metho, also known as the Unite States engineers evelope Hilf stone soil compaction rapi quality control metho, an the trial in Characteristics of this metho are: no etermination of moisture content, soil compaction in accorance with the wet bulk ensity an moisture content in case of the three test measurements of wet bulk ensity, we can etermine the egree of compaction of fill D an optimum moisture content w0p wf moisture an filling the margin (w0p-wf). Three-click metho is the principle of: Soil ry bulk ensity at maximum γ max an optimum moisture content of wet bulk ensity at the time of w 0p forγ max(1+w 0p ), be ivie by (1+w 0p )/(1+ w f ), can be transforme intoγ max (1+ w f ). W arbitrary moisture content of the wet bulk ensity of the sample for theγ (1+w), ivie by (1+w)/(1+w f ) to change the same for theγ (1+w f ) On where, when w f =0 when, Z=w, the representative of the moisture content; when w f > 0, the ws-style in the ry weight for the sample Determination of the site will fill compaction ensity of the soil samples into the same weight three, respectively, with ifferent weight of water (without holing), is suspecte in the attack hit it with a stanar feature, measure after tamping the wet bulk ensity forγ (1+ w), respectively, ivie by (1+Z), was transforme into theγ (1+w f ), be in the wet bulk ensity an wet bulk ensity for the transforme vertical coorinates, Z is the abscissa of the graph, raw γ (1+ w)~z an γ (1+w f )~Z two curves. From γ (1 + w f ) ~ Z curves for the orinate the only variables γ, so the same curve of the maximum orinateγ max(1+w f ) 3 Three-phase soil an soil maximum ry ensity 3.1 Territories of the three-phase Natural soil is a three-phase system, namely, soli-phase, liqui an gas; unsaturate soils is a two-phase system, namely, soli-phase an liqui phase; ry soil is also a two-phase system, namely, soli-phase an gas. The soil is compacte by the three-phase line 3.2 The ensity of soil By the compaction of soil through ifferent methos of sampling measure the quality of unit volume, are three-phase system is measure. Measuring moisture content through the conversion of the unit volume of ry soil quality, are two-phase system, is ieal for 2

3 the value of the conversion. Density of wet soil - soil ry ensity per unit volume is the quality of soil moisture, this part of the share volume of water if fille with ry soil, that is, the theory of soil maximum ry ensity, when the soil is still two-phase line. 4 Principle of the number of solution 4.1 Theoretical value of maximum ry ensity Department through the territories of three-phase analysis, the maximum ry ensity of soil uner the type that can be use: ( ) max = + water (1) The ensity of water by 1 terms, it was simplifie for the type = + ( ) max (2) Theory of the largest egree of compaction: 1 D = = 100% (3) max 1 + On the type (2) obtaine the largest number of solution is the theoretical maximum ry ensity, click it to five an three-click metho is the maximum ry ensity obtaine too, taking into account the actual an theoretical maximum is in the construction can not be achieve, accoring to soil compaction, that is reactive in the same compaction, the soil ry ensity of soil moisture content with the change, when the maximum ry ensity at moisture content as the corresponing optimum moisture content, Base on this, it is conceivable that in the actual construction, soil moisture content or greater than the optimum moisture content or less than optimal moisture content, optimum moisture content equivalent to the probability is very small, an Turkey when the actual construction of the water content equivalent to the most excellent moisture will reach the maximum when the ry ensity of compaction, egree of compaction to 100%. Therefore the construction of the maximum ry ensity shoul be in the optimal soil moisture content when the ry ensity 4.2 Construction of maximum ry ensity Solution Accoring to the principle of the wet soil ensity - ensity of ry soil per unit volume is the quality of soil moisture, this part of the share volume of water if fille with ry soil, that is, the theory of soil maximum ry ensity, then the optimal soil moisture content when rate greater than the actual moisture content of soil, the soil in the maximum ry ensity at optimum moisture content - the actual construction of China an Turkey is the moisture content per unit volume to achieve maximum ry ensity of soil when the moisture content of the 3

4 poor, the share of this part of the water If the volume fille with ry soil, an Turkey is the construction of the maximum ry ensity. In contrast, when the actual soil moisture content is greater than the optimum moisture content of soil, the construction of the actual moisture content of China an Turkey - the maximum ry ensity of soil at the optimum moisture content per unit volume is the maximum ry ensity of soil when the moisture content more rate, as the soil moisture content is the quality of the soil moisture content an ry soil mass ratio of the percentage, the conversion an construction in orer to simplify the maximum ry ensity: max = + water ο (4) With the maximum ry ensity, the ensity is like 1, the maximum ry ensity for the simplifie formula: max = + ( ) ο (5) In this way, calculating the egree of compaction is very convenient: D = max 1 = 100% 1 + ( ) ο (6) On where, D for the egree of compaction, to the measure ry ensity, max for maximum ry ensity, w to the measure wet ensity, o for optimum moisture content, w as measure moisture content, water the ensity of water 5 Project The following table is an example of a project out of the measure moisture content an wet ensity, by the stanars of inoor test, the optimal soil moisture content = 18%, blow ry ensity is the largest law 1.72g/cm 3, for the purpose of calculating the value of other ata. Table theoretical maximum ry ensity accoring to formula (2), the number of solution of maximum ry ensity accoring to formula (5), the number of egree of compaction metho base on formula (6), the egree of compaction tamping metho in accorance with the inoor test obtaine maximum ry ensity an ry ensity measure 4

5 The number of tamping metho statistical comparisons of egree of compaction metho Optimum moisture content =18%,Tamping metho of maximum ry ensity Pilot project 1.72g/cm3 Optimum moisture content Optimum moisture content Moisture content(%) Wet ensity(g/cm3) Dry ensity(g/cm3) Theoretical maximum ry ensity(g/cm3) Maximum ry ensity of the number of solution(g/cm3) Degree of compaction tamping metho(%) The number of egree of compaction metho(%) Examples from the table, the project can be seen, the number of egree of compaction metho in the calculation of the optimal moisture content near 18 percent, in the optimum moisture content of 18% moisture content on both sies with the increase or ecrease the egree of compaction ecreases with the test of the basic law. Test an calculate egree of compaction moisture content of 16.1 percent from 28.6 percent to the increase in egree of compaction was reuce to % from 95.26%. Strap test oes not match the basic law. Generate the possible reasons for this situation first test of the optimal moisture content i not ientify, an the other is the source material (incluing gravel volume) changes in thir test of the hit Shigong an construction features of RCC not comparable 6 The number of solution compare with the traitional metho In the quality control of soil compaction, the commonly use inicator of egree of compaction, which is ue to the uneven soil coefficient small, small particle size range, the ry ensity of soil compaction an soil than the maximum ry ensity. However, the values of maximum ry ensity, there are many variable factors, specifically manifeste in: 1) Inoor 5-click metho is by ajusting the moisture content is an ieal state, to etermine the maximum ry ensity in the vicinity of the optimal 2

6 moisture content of some change; 2) construction is not the optimum moisture content of moisture, but moisture may be the scope of construction; 3) Inoor 5 clicks with real law an the construction of the soil samples there may be changes in the volume of gravel, resulting in compactness often greater than 100% of the cases, which is chosen istortion of the maximum ry ensity; 4) the number of solution of the maximum ry ensity obtaine is the same type of soil, which is equivalent to point-to-point test, an the authenticity of a unique, on-site nee for test, just the source of material for optimal soil moisture test; 5) the number of three-point metho with a rapi strike law is similar, but more than three points a few fast solution metho tamping it easier to unerstan, the application is more convenient, the impact of the construction progress of the smaller. 7 Conclusion Construction of soil moisture on the soil for better, higher or lower than the optimal range of soil moisture are ifficult to compaction, construction project must scramble to prevent the sun or rain; the shop at the same time soil material thickness small, low prouction, quality inspection require part of a long time an can save time in test is part of enhance prouction. In this paper, the number of compacte soil solution for the maximum ry ensity an egree of compaction innovative thinking, in theory, is a major breakthrough in testing can greatly save time in the projects to promote the value of a certain 2