PENGARUH PENGGUNAAN KOLOM PASIR, LAYER PASIR, DAN TERUCUK BAMBU PADA TANAH LEMPUNG JENUH AIR TERHADAP PENURUNAN TANAH LEMPUNG MENGGUNAKAN UJI LABORATORIUM

ABSTRAKPenelitian ini bertujuan untuk mengetahui klasifikasi jenis tanah, properti tanah pengujian dan pengaruh penggunaan metode penambahan variasi tanah lempung jenuh air dengan menggunakan pasir dan cerucuk bambu, terhadap penurunan tanah lempung, kadar air, dan analisis T90. Penelitian eksperimen dengan menggunakan model boks baja, berukuran 100 cm x 100 cm x 40 cm sebagai media penempatan tanah lempung. Hasil penelitian ini yaitu: (1) Jenis tanah termasuk CH (Clay High Plasticity) menurut klasifikasi USCS dan kelompok 4-7-6(40) menurut klasifikasi AASTHO. (2) Properti tanah adalah G=2,63, LL=74,71%, PL=29,76%, IP=44,95%, SL=19,06%, C=0,75 kg/cm2, OMC=39,2%. (3) Penambahan TPV sangat efektif memperkecil penurunan. Pada pemberian tekanan 0,0125 kg/cm2, 0,025 kg/cm2, 0,05 kg/cm2, dan 0,01 kg/cm2 memperkecil penurunan, berturut-turut: 75,93%; 56,32%; 59,44% dan 42,32%. Pada kedalaman -10 cm penggunaan TPH paling efektif mengurangi kadar air tanah lempung yaitu sebesar 53,30%, berarti mengurangi kadar air sebesar 3,62% dari kondisi tanah asli (TTD). Pada kedalaman 20 cm, penggunaan TCB paling efektif mengurangi kadar air sebesar 3,55% dari kadar air tanah lempung asli (TTD). Penggunaan CTPVH pada beban 0,1 kg/cm2 paling efektif dalam proses konsolidasi yaitu sebesar 94,10% dari tanah asli (TTD) dimana mempunyai nilai sebesar nilai t90 untuk CTPVH yaitu sebesar 15,21 menit. Kata Kunci: air, perkuatan, tanah lempung, T90 ABSTRACT This study aims to determine the classification of soil types, soil properties tested and the effect of using the method of adding variations in the water-saturated clay, using sand and bamboo piles, to clay settlement, moisture content, and T90 analysis. The experimental study used a steel box model, measuring 100 cm x 100 cm x 40 cm as a medium for clay placement. The results of this study are: (1) Soil types including CH (Clay High Plasticity) according to USCS classification and groups 4-7-6 (40) according to AASTHO classification. (2) Soil properties is G=2,63, LL=74,71%, PL=29,76%, IP=44,95%, SL=19,06%, C=0,75 kg/cm2, OMC=39,2%. (3) Addition of TPV is very effective in reducing the settlement. At a pressure of 0,0125 kg/cm2, 0,025 kg/cm2, 0,05 kg/cm2, and 0.01 kg/cm2 minimizing the settlement, respectively: 75,93%; 56,32%; 59,44% and 42,32%. At depths of -10 cm the most effective use of TPH reduces clay soil moisture content by 53,30%, which means reducing water content by 3,62% from the original soil conditions (TTD). At a depth of 20 cm, using TCB is most effective at reducing water content by 3,55% from the original clay soil content (TTD). The use of CTPVH at a load of 0,1 kg/cm2 is most effective in the consolidation process which is 94.10% of the original soil (TTD) which has a value of T90 for CTPVH which is 15,21 minutes. Keywors: water, strainthening, clay, T90

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Effects of some soil conditions on sugar-beet seedling emergence

The Journal of Agricultural Science ◽

10.1017/s0021859600025934 ◽

1972 ◽

Vol 79 (3) ◽

pp. 543-545 ◽

Cited By ~ 2

Author(s):

P. C. Longden

Keyword(s):

Soil Moisture ◽

Sugar Beet ◽

Clay Soil ◽

Sandy Loam ◽

Seedling Emergence ◽

Clay Soils ◽

Soil Types ◽

Soil Conditions ◽

Soil Conditioners ◽

Water Holding

SUMMARYSeven soil conditioners added to a sandy clay soil at Saxmundham did not benefit sugar-beet seedling emergence in four experiments in 3 years. In microplots at Broom's Barn free draining peat and sandy loam gave consistently more seedlings than limestone loam or flinty loam. In the laboratory, for each of three soil types, emergence was maximal only for a small soil moisture range and decreased rapidly when soils became drier or wetter. This suggests that conditioners which increase water-holding capacity should be tested on sandy loams rather than clay soils and that seed-bed preparation on heavier soils should seek to aerate the soil.

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A study of clay soil deformability over time

Vestnik MGSU ◽

10.22227/1997-0935.2020.12.1654-1662 ◽

2020 ◽

pp. 1654-1662

Author(s):

Marina N. Mikova ◽

Evgeniya N. Akbulyakova

Keyword(s):

Clay Soil ◽

Constant Load ◽

Clay Soils ◽

Relative Deformation ◽

High Plasticity ◽

Consolidation Process ◽

Liquidity Index ◽

Semi Solid ◽

Very High ◽

Over Time

Introduction. The study is focused on the process of clay soil deformation over time, provided that this soil, featuring varied liquidity index values, is exposed to constant load. The consolidation process is slow; it can run for years or decades in clay soils. Long-term deformations of clay soils must be taken into account in the course of design and construction of buildings and structures, on the one hand, and in the process of analyzing settlement rates and maximal settlement values for foundation beds, on the other hand. Materials and methods. Semi-solid, low-plasticity, high-plasticity, very high plasticity, and free-flowing clay samples were used in the study. The parameters under research encompass relative and absolute deformation of soil samples over time. These parameters are dependent on the soil liquidity index value. All laboratory tests were carried out in compression machines, and tested samples were exposed to constant load. The experimental data thus obtained were supplemented by the information provided M.A. Koltunov. Results. Values of absolute deformations and time-to-relative deformation ratios were obtained for clays having different liquidity index values. The analysis of the time-to-relative deformation curves shows that deformations develop over time at different rates depending on the liquidity index of clay soils. An increase in the value of the liquidity index boosts the values of initial deformations and deformation rates. Conclusions. The equations, derived in the course of the study, allow to analyze the deformation of semi-solid, low-plasticity, high-plasticity, very high plasticity, and free-flowing clays for various time ranges depending on the initial clay liquidity index. The accuracy of the approximation of these equations varies from 0.801 to 0.993, which makes it possible to characterize these dependences as high quality mathematical models.

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Fluidized-bed: As an alternative method for rill erodibility modeling

10.5194/egusphere-egu2020-7985 ◽

2020 ◽

Author(s):

Selen Deviren Saygin ◽

Fikret Ari ◽

Cagla Temiz ◽

Sefika Arslan ◽

Mehmet Altay Unal ◽

...

Keyword(s):

Soil Properties ◽

Flow Velocity ◽

Fluidized Bed ◽

Soil Types ◽

Soil Conditions ◽

Data Sets ◽

Flume Experiments ◽

Concentrated Flow ◽

Erosion Prediction ◽

Moisture Conditions

Rill erodibility (Kr), which is a measure of the resistance of soil particles against disintegration in a rill under concentrated flow conditions, is a significant characteristic for rill initiation in a field. &#160;The Process-based WEPP (Water Erosion Prediction Project) originally models Kr by linear excess shear stress (&#964;), and it is mostly obtained from mini-flume experiments at laboratory conditions. Alternatively, a critical value of flow stress (&#964;cr) that points to fragmentation in rills can be modeled by a fluidized bed approach that quantifies the conditions in terms of cohesion (Co) and flow velocity (Vf) by considering the soil as a cohesive material. In there, the water as a fluid applies pressure on solid particle proportional to flow rate of the fluid (v). But, performed related studies on it were mostly tested for the limited soil types. The objectives of this study were to test these relationships and model the rill characteristic for the heavy textures of different soil types and investigate the role of basic soil properties on rill initiation. Experimental results showed that the stronger regression coefficient (R2=0.78) was found between Kr and flow velocity (Vf) monitored at the fluidization stage than that between Co & &#964;cr at the studied soil conditions. However, correlations between constant and dynamic soil properties and the measured Kr, &#964;cr, Co and Vf values were also quite remarkable (p<0.01) for next-generation modeling studies in terms of rill dynamics. It is believed that the fluidized-bed approach has a great potential to model Kr and encouragingly it is worth to be tested with wider data-sets under different soil-moisture conditions.Keywords: Rill erodibility, Soil Cohesion, Fluidized bed approach, WEPP

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Effect of variability in soil properties plus model complexity on predicting topsoil water content and nitrous oxide emissions

Soil Research ◽

10.1071/sr18080 ◽

2018 ◽

Vol 56 (8) ◽

pp. 810 ◽

Cited By ~ 2

Author(s):

Iris Vogeler ◽

Rogerio Cichota

Keyword(s):

Nitrous Oxide ◽

Soil Properties ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Soil Profile ◽

Nitrous Oxide Emissions ◽

Soil Types ◽

N2o Emissions ◽

Silt Loam

Despite the importance of soil physical properties on water infiltration and redistribution, little is known about the effect of variability in soil properties and its consequent effect on contaminant loss pathways. To investigate the effects of uncertainty and heterogeneity in measured soil physical parameters on the simulated movement of water and the prediction of nitrous oxide (N2O) emissions, we set up the Agricultural Production Systems sIMulator (APSIM) for different soil types in three different regions of New Zealand: the Te Kowhai silt loam and the Horotiu silt loam in the Waikato region, and the Templeton silt loam in the Canterbury region, and the Otokia silt loam and the Wingatui silt loam in the Otago region. For each of the soil types, various measured soil profile descriptions, as well as those from a national soils database (S-map) were used when available. In addition, three different soil water models in APSIM with different complexities (SWIM2, SWIM3, and SoilWat) were evaluated. Model outputs were compared with temporal soil water content measurements within the top 75mm at the various experimental sites. Results show that the profile description, as well as the soil water model used affected the prediction accuracy of soil water content. The smallest difference between soil profile descriptions was found for the Templeton soil series, where the model efficiency (NSE) was positive for all soil profile descriptions, and the RMSE ranged from 0.055 to 0.069m3/m3. The greatest difference was found for the Te Kowhai soil, where only one of the descriptions showed a positive NSE, and the other two profile descriptions overestimated measured topsoil water contents. Furthermore, it was shown that the soil profile description highly affects N2O emissions from urinary N deposited during animal grazing. However, the relative difference between the emissions was not always related to the accuracy of the measured soil water content, with soil organic carbon content also affecting emissions.

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The Influence of the Clay's Geotechnical Behaviors with the Fly Ash

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.170-173.164 ◽

2012 ◽

Vol 170-173 ◽

pp. 164-168

Author(s):

Xiao Min Zhao ◽

Li Wen Cao

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Moisture Content ◽

Soil Properties ◽

Water Content ◽

Liquid Limit ◽

Plasticity Index ◽

Soil Plasticity ◽

Influence Mechanism

In this paper, the different proportion and different time of fly ash soil mixed soil properties， mainly the plastic liquid limit and compressive strength were analyzed. The results showed that soil plasticity index was decreased with the increase of the content of fly ash and the plastic liquid limit decrease with the extension of time. The compressive strength of the three kinds mixing with the different water content was increase following the water content decrease. Moisture content is less than the best water content, compressive strength changes with the water content, water content is greater than the compressive strength of the best when water content with moisture content changes gently. This paper analyses the influence mechanism of the characteristics of the fly ash on soil.

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Pengaruh Penambahan Batu Kapur Terhadap Kuat Geser Dan Daya Dukung Tanah Lempung

Media Ilmiah Teknik Sipil ◽

10.33084/mits.v9i2.2044 ◽

2021 ◽

Vol 9 (2) ◽

pp. 84-91

Author(s):

Edo Aristianto ◽

Suradji Gandi ◽

Okrobianus Hendri

Keyword(s):

Water Content ◽

Carrying Capacity ◽

Clay Soil ◽

High Plasticity ◽

Direct Shear ◽

Shear Testing ◽

Central Kalimantan ◽

Strong Shear ◽

Dry Conditions ◽

Direct Shear Testing

Generally most of Tewang Rangkang area, Tewang Sangalang Garing District, Katingan Regency of Central Kalimantan Province is covered by clay soil with considerable development (high plasticity), the volume will change (expand) when the water content increases (changes). The volume will increase in wet conditions and will shrink when in dry conditions. It is this trait that causes damage to the construction of buildings. The purpose of this study is to know the addition of limestone to the strong value of shear and the carrying capacity of clay soil. This test was done by mixing limestone with soil in a mixture variation of 0%, 5%, 7.5%, 10%, 12.5%. Based on the results of direct shear testing against the strong value of shear and carrying capacity in the original soil obtained a strong value of shear (τ) = 0.184 kg / cm2, qult = 3.36 kg / cm2, after the addition of limestone 12.5% curing 7 days obtained strong shear value (τ) = 0.219 kg / cm2, qult = 26.04 kg / cm2, so that with the addition of limestone gives an influence on the increase in the strong value of shear and the carrying capacity of clay soil.

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INFLUENCE OF SURFACE SOIL CONDITIONS ON DRYING IN EARLY SPRING

Canadian Journal of Soil Science ◽

10.4141/cjss72-056 ◽

1972 ◽

Vol 52 (3) ◽

pp. 449-456 ◽

Cited By ~ 2

Author(s):

M. M. IQBAL ◽

B. P. WARKENTIN

Keyword(s):

Hydraulic Conductivity ◽

Water Content ◽

Water Loss ◽

Surface Soil ◽

Clay Soil ◽

Early Spring ◽

Clay Soils ◽

Soil Conditions ◽

Turbulent Transfer ◽

Net Radiation

Changes in water content of adjacent plowed and unplowed surface soils were measured in early spring in the field. The plowed plots on sand and clay soils lost more water than unplowed plots. The major decrease in water content of the clay soil was in the 0–7-cm layer, whereas the sand lost as much water from the 7–15-cm layer as from the 0–7-cm layer. The medium-grained soil showed greater drying from the unplowed than from the plowed surface. The higher bulk density of this soil may account for this observation. Differences in net radiation measured above plowed and unplowed surfaces were too small to account for the measured differences in water loss. There was evidence that the drier surface was due to lower hydraulic conductivity of the plowed surface, but increased turbulent transfer from the rougher surface could also be involved.

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