scholarly journals Overview of the Quaternary sediments deformation modulus dependence on testing methodology

Baltica ◽  
2020 ◽  
Vol 33 (2) ◽  
pp. 191-199
Author(s):  
Tadas Tamošiūnas ◽  
Šarūnas Skuodis ◽  
Gintaras Žaržojus
Keyword(s):  
Quaternary System ◽  
Engineering Geology ◽  
Deformation Modulus ◽  
Quaternary Sediments ◽  
Economic Activities ◽  
Reliable Assessment ◽  
Modern Engineering ◽  
Modulus Of Deformation ◽  
Current Article ◽  
Empirical Coefficients

The surface of earth on the territory of Lithuania is covered by sediments of the Quaternary system, which are the object of human economic activities. Reliable assessment of sediment deformations is an important task of modern engineering geology and geotechnical engineering. The deformation of sediments is most often described using the modulus of deformation. The current article overviews different methods employed in deformation moduli determination and their application possibilities. The deformation moduli, which are used in various calculations, are usually calculated using correlation formulas and empirical coefficients. Thus, the obtained results may be inaccurate or completely unsuitable for further interpretation of the numerical situation. This article presents recommendations with regard to the use of various calculated deformation moduli in interpreting Lithuanian Quaternary system sediments.

scholarly journals Calculation of a beam on an inhomogeneous basis

2018 ◽  
Vol 251 ◽  
pp. 04023
Author(s):  
Nikolaj Atarov
Keyword(s):  
Numerical Calculation ◽  
Power Law ◽  
Modulus Of Elasticity ◽  
Strain Energy ◽  
Deformation Modulus ◽  
Bending Moment ◽  
System Of Differential Equations ◽  
Total Potential ◽  
Modulus Of Deformation ◽  
Symmetric Load

The questions of analytical calculating the beam on the base with the modulus of deformation (modulus of elasticity), which is changed by thickness of the layer by power law, was deals in the article. The purpose of work was receiving finite expressions for reactive pressure of the basе on a beam and internal efforts in a beam when using model of the base with two characteristics (coefficient of subgrade resistance). A system of differential equations second-order with respect to the displacements of points the surface of a layer with a continuously changing modulus of elasticity was obtained based on the minimum of the total potential strain energy. The calculation of the rigid beam on the base on the action of the symmetric load was performed and the formulas for the reactive pressures of the base were got. Numerical calculation is executed and the analysis of influence of change of the module of deformation of a layer by the amount of reactive pressure and the bending moment in a beam was given. It is shown that with increase in the module of deformation on layer thickness the basе with two characteristics on nature of work is approaching vinklerovsky.

scholarly journals STUDI PENURUNAN SEDIMEN KUARTER DI PERAIRAN CIREBON, PROPINSI JAWA BARAT

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Kris Budiono ◽  
Purnomo Raharjo
Keyword(s):  
Engineering Geology ◽  
Soil Mechanic ◽  
Quaternary Sediments ◽  
Test Analysis ◽  
Long Period ◽  
Key Word ◽  
Allowable Bearing Capacity ◽  
Soil Settlement ◽  
Recent Sediments ◽  
Total Sediment

Penelitian ini lebih difokuskan dalam mengaplikasikan data geologi teknik untuk menganalisis kemungkinan potensi penurunan sedimen Kuarter apabila didirikan suatu bangunan laut. Secara umum litologi daerah penelitian diperkirakan terdiri dari sedimen berumur Plistosen sampai Kuarter Data yang dipergunakan adalah data hasil pemboran teknik di laut dengan uji SPT dan hasil analisa laboratorium mekanika tanah. Berdasarkan pada perhitungan nilai SPT untuk setiap tiang pancang menunjukkan bahwa nilai daya dukung dijinkan (Qa) adalah 83,726 ton. Perkiraan nilai penurunan (St) adalah 0,992 cm atau 0,390 inci. Hasil perhitungan untuk dimensi dermaga yang direncanakan memperlihatkan bahwa beban total yang terjadi pada dermaga (q) adalah 2,18 ton/m2. Potensi penurunan lapisan tanah berdasarkan hasil uji laboratorium adalah 2,35 cm. Lamanya penurunan untuk terjadinya konsolidasi 10% adalah 94,81 hari (3,16 bulan), konsolidasi 20% adalah 367,41 hari (1,06 tahun), konsolidasi 50% adalah 2334,81 hari (6,39 tahun) dan konsolidasi 90% adalah 100503,7 hari (27,54 tahun). Berdasarkan kondisi tersebut di atas, menunjukan bahwa daerah penelitian memiliki potensi penurunan kecil dan dalam dalam waktu yang relatif lama. Kata kunci : geologi teknik, penurunan, bangunan laut, perairan Cirebon The aim of the study is mainly to apply the engineering geological data for analyzing the settlement potency of Quaternary sediments if the sea construction is built. In general, the litology in the study area consist of Plistocene to Recent sediments. The data used in this study are the offshore cores, namely, the SPT test and soil mechanic analyses. The SPT values of each pile shows that the allowable bearing capacity value is 83,726 ton. The estimation of settlement value ((St) is 0,992 cm or 0,390 inches. The total sediment loaded at the port (q) is 2,18 ton/m2, whereas based on the laboratory test analysis, it shows that the potential of soil settlement layer is 2,35 cm. The settlement period for 10% of consolidation is 94,81 days (3,16 months), 20% of consolidation is 367,41 days (1,06 years), 50% of consolidation is 2334,81 days (6.39 years), and 90% of consolidation is 100503,7 days (27.54 years). The above conditions indicate that the settlement in the study area is under going subsidence in small potential and in relatively long period. Key word : engineering geology, settlement, offshore structur, Cirebon waters

Development of new tables of transition factors from the results of compression tests to the plate-bearing modulus

2019 ◽  
Vol 13 (1) ◽  
pp. 18-30
Author(s):  
A. N. Trufanov
Keyword(s):  
Effective Stress ◽  
Linear Equations ◽  
Deformation Modulus ◽  
Compression Modulus ◽  
Anomalous Behavior ◽  
Compression Tests ◽  
Starting Point ◽  
Porosity Coefficient ◽  
Modulus Of Deformation ◽  
Soil Flow

The article is devoted to the issue of developing new tables of transition factors relating the results of compression and plate-bearing tests. As is known, the normative value of the modulus of deformation is directly determined from the most reliable plate-bearing tests. However, they are quite laborious and expensive. In contrast to plate bearing tests, compression tests are much cheaper, but they give underestimated values of the deformation modulus. In this connection, a table of transition coefficients from a compression module to a plate-bearing deformation modulus was developed (Agishev – Ignatova table). The article shows that the initial stress ranges selected for the determination of the compression and platebearing deformation modulus differ significantly. The compression module, as well as the odometric modulus of deformation in the latest version of the table, was determined in a fixed pressure range, and the plate-bearing test curve for the linear section, the starting point of which is an alternating natural effective stress. To eliminate this contradiction, when developing new tables, instead of a compression modulus, a tangential odometric modulus of deformation was used, determined for the corresponding value of the natural effective stress. The algorithm for determining new transition coefficients is described in detail. In the new tables, in addition to the porosity coefficient, the soil flow rate is also taken into account. The effect of consistency on the definition of the plate-bearing modulus and the absence of such an effect on the results of compression tests are noted. Anomalous behavior of clay of solid consistency is shown during compression tests. In addition to the tables of transition coefficients, a table of linear equations is provided for a direct transition from the results of compression tests to a plate-bearing deformation modulus. New tables are proposed to be used to determine the standard value of the modulus of soil deformation at the stage of preliminary calculations for the foundations of buildings and structures of the II and III geotechnical categories.

scholarly journals MỘT SỐ ĐẶC ĐIỂM ĐỊA CHẤT PLIOCEN - ĐỆ TỨ, ĐỊA CHẤT CÔNG TRÌNH KHU VỰC MIỀN TRUNG VÀ ĐÔNG NAM THỀM LỤC ĐỊA VIỆT NAM

2011 ◽  
Vol 33 (2) ◽  
pp. 109-118
Author(s):  
Mai Thanh Tân ◽  
Phạm Văn Tỵ ◽  
Đặng Văn Bát ◽  
Lê Duy Bách ◽  
Nguyễn Biểu ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Engineering Geology ◽  
Quaternary Geology ◽  
Quaternary Sediments ◽  
Construction Sites ◽  
Development History ◽  
Level Change ◽  
Geological Characteristics ◽  
System Tracts ◽  
The Relationship

Characteristics of Pliocene - Quaternary geology and Geoengineering in the Center and Southeast parts of Continental Shelf of VietnamVietnam has a large continental shelf with complicated geological characteristics. The study of the Pliocene-Quaternary sediments is very important for understanding the shallow geological characteristics, potential of mineralresources, as well as the evaluation of offshore construction sites conditions. By the combination of HRS, 2-D, 3-Dseismic and other geological methods, the detailed investigating results of the Pliocene - Quaternary formations in the Center and Southeast parts of continental shelf of Vietnam have been obtained.In this paper, the authors present the research results of establishing the structural maps, determining thesedimentary system tracts and sequences, the relationship between sedimentary cycles, sea level change and tectonicmovement, facial-paleogeographic characteristics, geological development history and characteristics of engineering geology Pliocene - Quaternary.

scholarly journals ON THE TASKS OF REORGANIZATION ENGINEERING GEOLOGY IN THE RUSSIAN FEDERATION

2018 ◽  
Vol 13 (4-5) ◽  
pp. 6-10 ◽  
Author(s):  
V. T. Trofimov ◽  
V. A. Korolev
Keyword(s):  
Russian Federation ◽  
Engineering Geology ◽  
Highly Qualified ◽  
Qualified Personnel ◽  
Modern Engineering ◽  
Theoretical Fundamental ◽  
The Russian Federation ◽  
Geological Work ◽  
Vladimir Putin ◽  
Academy Of Sciences

The state of engineering geology in Russia and the main tasks for its reorganization in connection with the ongoing reform of the Russian Academy of Sciences and the current problems of the development of science in the Russian Federation in the present period are analyzed. The main drawbacks of the current state of engineering geology, according to the authors, are: 1) low level of organization and coordination of engineering and geological work, including scientific, in the country; 2) non-demand by the business of scientific developments and innovative achievements of modern engineering geology; 3) lowering the level of constantly updated and changing regulatory framework, especially in the field of engineering surveys; 4) shortcomings in the training of highly qualified engineers-geologists. The tasks of development of engineering geology in connection with the message of President Vladimir Putin to the Federal Assembly of the Russian Federation on March 1, 2018 are considered. The analysis of the message of the President of the Russian Federation, implies at least five priorities, in the implementation of which modern geological engineering should also find its worthy place: 1) the spatial development of the country; 2) the development of communications; 3) the solution of a number of environmental issues; 4) the development of fundamental science; 5) training of highly qualified personnel. Without the participation of engineering geologists, the effective solution of these tasks is impossible. The theoretical (fundamental) and practical role of engineering geology, as the science of the geological cycle in solving these major problems is indicated. The necessity of the All-Russian Congress of Engineers-Geologists is substantiated, where it is proposed to discuss the pressing issues of the reorganization of engineering geology in the country, its structure, as well as actual theoretical (fundamental) and practical (applied) problems of its development, the training of highly qualified engineers and geologists, etc.

scholarly journals Filter leaching of salt soils of automobile roads

2021 ◽  
Vol 264 ◽  
pp. 02032
Author(s):  
Rashidbek Hudaykulov ◽  
Dilfuza Makhmudova ◽  
Dilshod Kayumov ◽  
Olmos Zafarov
Keyword(s):  
Water Saturation ◽  
General Scheme ◽  
Salt Content ◽  
Deformation Modulus ◽  
Sharp Change ◽  
Study Results ◽  
Salt Crystals ◽  
Porosity Coefficient ◽  
Modulus Of Deformation ◽  
Water Saturated

Globally, in arid regions, due to the irrational use of water resources for irrigating plants, salinization of soils occurs, which causes significant damage to the country's economy. In particular, recently in some regions of Uzbekistan, there has been a rise in groundwater and flooding of territories. In these areas, where the soil bases of highways contain such readily soluble salts as: NaCL, Na2SO4·10H2O, MgSO4·7H2O, MgCL2·6H2O, CaCL2·6H2O, NaHCO3, Na2CO3·10H2O, CaCO3 and CaSO4·2H2O, additional suffusion precipitation is often observed which lead to deformations of road surfaces. Additional precipitation is due to the dissolution of salt crystals upon ingress of moisture during filtration leaching. Filtration leaching of soils was carried out in the F-1M device according to the upward flow pattern. To determine the amount of leached salts during the experiment, the infiltrate was taken, its volume and mineralization were recorded. At the end of the tests, the soil was tested according to the general scheme. To assess the influence of the leaching process on the strength indices of the studied soils by the methods of consolidated and fast shear, tests of pre-leached samples were performed. When testing soils, samples were cut, pre-compacted with the same specified load, and leached for a month. In laboratory conditions, the deformation modulus was determined by performing compression experiments. In connection with a sharp change in the modulus of deformation of soils during moistening, the tests were carried out at two values of humidity: at natural and after water saturation without the possibility of swelling. The study results show that the deformation modulus of water-saturated loams satisfactorily correlates with the value of the initial porosity coefficient and decreases as a result of water saturation and leaching. The degree of decrease depends on the value of the initial deformation modulus: the higher it is, the more significant its change. The value of the coefficient of weakening of the soil structure depends on the effective average pressure. The criterion for the permissible salt content in the base of the roadbed of highways should be taken not only the value of the degree of salinity but also the change in the indicators of the mechanical properties of soils used in the design of the construction of the roadway during soaking and leaching.

A Study on the Impact of Structure Plane on Unloading Rock Mass Deformation

2011 ◽  
Vol 243-249 ◽  
pp. 2167-2170
Author(s):  
Fei Wang ◽  
Xu Li Liang ◽  
Jian Po Du ◽  
Jian Feng Qi
Keyword(s):  
Rock Mass ◽  
Great Influence ◽  
Deformation Modulus ◽  
Strength Parameter ◽  
Deformation Properties ◽  
Modulus Of Deformation ◽  
Rock Mass Deformation ◽  
Structure Plane ◽  
The Impact ◽  
Mass Deformation

The rock mass deformation properties of unloading is very different from loading.The physical and mechanical properties of structural plane can bring a very great influence to rock’s unloading behavior. The lower the strength parameter of joint plane and the greater the angle of joint, the lower the unloading modulus of deformation. The greater the connectivity of joint,the faster the unloading modulus of deformation descend. In any case unloading amount is near linear relation with descend amount of unloading deformation modulus.

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