scholarly journals Investigation of the Consolidation Behavior of Soft Soil Improved with Vertical Drains by Finite Element Method

2021 ◽  
Vol 13 (3) ◽  
pp. 93-105
Author(s):  
Recep AKAN ◽  
Sedat SERT
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Soft Soil ◽  
Vertical Drains ◽  
Consolidation Behavior ◽  
Element Method

Study on the Settlement of Soft Soil Subgrade with a Crust Layer

2014 ◽  
Vol 505-506 ◽  
pp. 82-88
Author(s):  
Da Zhi Wu ◽  
Zhen Ying Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Soft Soil ◽  
The Finite Element Method ◽  
Crust Layer ◽  
Element Method

By using the finite element method, the settlement of soft soil subgrade with a crust layer has been investigated. To find the influence of thickness of the crust layer on the settlement, four different thicknesses, which are 0.0m, 1.5m, 3.5m and 5.5m, are selected. Besides, the settlement during the construction and post construction are also analyzed. It is found that the crust layer can reduce the settlement and uneven settlement of subgrade effectively. Besides, the settlement of the subgrade decreases with the increase of the thickness of crust layer. Moreover, with the increase of time, the uneven settlement of the pavement increases gradually. And when the time is up to a certain degree, the uneven settlement tends to be stable.

Oedometer tests of soft soil and attempt of their numerical simulation

2017 ◽  
Vol 32 (1) ◽  
pp. 46-49
Author(s):  
Patryk Juszkiewicz ◽  
Paweł Szypulski ◽  
Kamila Międlarz
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Soft Soil ◽  
Test Results ◽  
Strength Parameters ◽  
Vistula River ◽  
The Dead ◽  
Oedometer Tests ◽  
Element Method

For the purpose of this article, oedometer tests were performed on organic silt samples derived from the bottom of an excava¬tion made near the Dead Vistula River. Three independent oedometer tests, with required basic tests for them, were carried out on specimens made from the same sample. Based on the test results, compressibility characteristic, physical and strength parameters of organic silt were determined. Using finite element method, attempts of simulation oedometer tests and cali¬bration of compression parameters were made.

scholarly journals ANALISIS LENDUTAN MODEL SISTEM CAKAR AYAM MODIFIKASI DENGAN PEMBEBANAN TUNGGAL (BEBAN TITIK)

2019 ◽  
Vol 2 (2) ◽  
pp. 53
Author(s):  
Lutfi Ahmad Yudandi ◽  
Bambang Setiawan ◽  
Noegroho Djarwanti
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bearing Capacity ◽  
Soft Soil ◽  
The Road ◽  
Variation Distance ◽  
The Difference ◽  
Element Method

<em>Soft soil has low bearing capacity and high compressibility that can cause instability and long-term degradation that can make around some road settlement or wavy. A solution to prevent this soft soil problem was built Modified Chicken Foot, The function of Chicken Foot Foundation is to increase its bearing capacity. This research is using single load<strong> </strong>with variation distance of triangle foot foundation pattern whereas analysis of deflection using finite element method based. The research shows displacement result is depend on distance between load position and foot foundation, the closer distance between foot foundation the less it would result. The displacement result that happened at roadside is larger than at middle of the road, the difference between them is -6,8% up to 67% and The displacement result that happened in plate without pipe is larger than a plate with pipe, the difference between them is 12,31% up to 59,41%.  </em>

Using the Finite Element Method Analysis of Tianjin 112 State Line Road Soft Soil Subgrade

2014 ◽  
Vol 501-504 ◽  
pp. 372-375
Author(s):  
Xiao Cheng Su ◽  
Hai Zhen Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Coupling Effect ◽  
Soft Soil ◽  
Composite Foundation ◽  
The Finite Element Method ◽  
Nonlinear Characteristics ◽  
Foundation Pile ◽  
Method Analysis ◽  
Element Method

By using the finite element method we had studied the Tianjin Expressway Subgrade Settlement.Through the comparison of the reinforcement and the unreinforced two case we studied the principles of strengthening soft soil subgrade and results show that the mixing pile to improve the bearing capacity of the embankment foundation, reduce the settlement of foundation has played a very good role.The finite element method can reflect the nonlinear characteristics of the coupling effect between composite foundation pile, soil and the soil around the pile, the soil using elastoplastic model, and considering the different medium, different distribution,which has great advantages in the analysis of various factors.The finite element method can better reflect the reinforcement of soft soil subgrade.So ,it also can optimize the engineering design.

PERFORMANCE PREDICTION OF PREFABRICATED VERTICAL DRAIN IN SOFT SOIL USING FINITE ELEMENT METHOD

2015 ◽  
Vol 76 (2) ◽  
Author(s):  
Teh Zhi Huan ◽  
Rini Asnida Abdullah ◽  
Mohd For Mohd Amin ◽  
Mohd Azril Hezmi ◽  
Ahmad Safuan A Rashid ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Soft Soil ◽  
Computer Software ◽  
Time Rate ◽  
Element Analysis ◽  
Vertical Drain ◽  
Prefabricated Vertical Drain ◽  
Ultimate Settlement ◽  
Element Method

Prefabricated vertical drain (PVD) had successfully been applied in many soft ground construction projects. Finite element method (FEM) could assist designers to model very complex subsoil and structural elements. In this study, finite element analysis (FEA) is performed to verify the effectiveness of modelling of PVD in subsoil using computer software, Plaxis V8. The field settlement data were collected at two particular locations and were analysed using Asaoka’s method to estimate the ultimate settlement and back-calculated the coefficient of horizontal consolidation for these two particular location. Thereafter, by using back-calculated coefficient of horizontal consolidation, FEA were performed to predict the time rate settlement and compared against field settlement results. From the time rate settlement curves generated by FEM, the ultimate settlements were predicted using Asaoka’s method. The ultimate settlement predicted from FEM is slightly lower compared to actual field settlement monitoring result, but the degree of consolidation settlement achieved were higher.

scholarly journals ANALISIS STABILITAS TIMBUNAN DI ATAS KONSTRUKSI TIANG DAN GEOSINTETIK MENGGUNAKAN PROGRAM ELEMEN HINGGA

2020 ◽  
Vol 3 (3) ◽  
pp. 809
Author(s):  
Yosia Firmansyah ◽  
Andryan Suhendra
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Tensile Strength ◽  
Calculation Method ◽  
Soft Soil ◽  
Soil Characteristics ◽  
The Finite Element Method ◽  
Accurate Analysis ◽  
3D Software ◽  
Element Method

soft soil is a challenge for geotechnical engineer due to  the characteristics of the soil that cause over settlement. Geosynthetic reinforcement is used on piles to correct undesirable soft soil characteristics. This thesis will use the BS 8006 methods and 3D software that use the finite element method to compare the geosynthetic tensile strength and how geosynthetic influences the embankment. The author will use the 3D software in the hope that it will produce a more accurate analysis compared to the 2D software. This thesis will compare the calculation of the geosynthetic tensile strength with the finite element method and the BS 8006 method. This is done because the calculation method BS 8006 does not take into account the subgrade in analyzing the geosynthetic tensile strength. This geosynthetic material has been proven to reduce slippage and channel load to the pile. This reinforcement of poles and geocyntetics can increase embankment safety factor by at least 0.35. 

scholarly journals ANALISIS STABILITAS TEROWONGAN DANGKAL PADA TANAH LUNAK

2020 ◽  
Vol 1 (1) ◽  
pp. 573-584
Author(s):  
Putri Nova Haryu Dhanti ◽  
Singgih Saptono
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stability Analysis ◽  
Soft Soil ◽  
Infrastructure Development ◽  
The Finite Element Method ◽  
Swelling Properties ◽  
Road Tunnels ◽  
The Stability ◽  
Element Method

ABSTRAK Pada lima tahun terakhir ini banyak pembangunan yang dilakukan di Indonesia khususnya pembangunan infrastruktur, seperti pembangunan sarana Mass Rapid Transportation (MRT) berupa terowongan di Jakarta, dan berapa terowongan jalan raya dan terowongan jalur kereta api. Hal ini menjadi tantangan bagi para pembuatan terowongan di Indonesia. Tantangan tesebut adalah membuat terowongan jalan raya dan kereta api pada tanah lunak khususnya lempung dan pada kedalaman yang dangkal. Hal ini perlu perhatian khusus, disebabkan oleh sifat lempung yang memiliki sifat swelling dan serta penggalian terowongan tersebut pada kedalamanan kurang dari 100 m. Pendekatan kekuatan batuan sudah tidak dapat digolongan sebagai batuan karena pada umumnya menurut meterial lempung digolongkan sebagai tanah, sehingga teori elastistas sudah tidak berlaku lagi. Pendekatan yang diusulkan untuk analisis stabilitas  pada terowongan di batuan lempung  adalah berperilaku swelling sesuai dengan kandungan mineral penyusunnya yaitu montmorilonit. Untuk itu analisis stabiltas diperlukan parameter swelling. Pada Analisis dengan perilaku sewlling ini menggunakan metode elemen hingga (Phase2, Rocscience). Dengan pendekatan perilaku Swelling dalam  analisis stabilitas terwongan akan lebih mendekati dengan sifat material yang ada di terowongan. Kata kunci: swelling, metode elemen hingga, stabilitas, terowongan  ABSTRACT In the last five years a lot of development has been carried out in Indonesia, especially infrastructure development, such as the construction of Mass Rapid Transportation (MRT) facilities in the form of tunnels in Jakarta, and how many road tunnels and railroad tunnels. This is a challenge for tunnels in Indonesia. The challenge is to build road and rail tunnels on soft soil, especially clays and at shallow depths. This needs special attention, due to the nature of the clay which has swelling properties and the excavation of the tunnel in the depth of less than 100 m. Rock strength approach can no longer be classified as rock because in general according to clay meterial classified as soil, so the theory of electricity is no longer valid. The proposed approach for the stability analysis of tunnels in clay rock is to behave swelling according to its constituent mineral content, montmorillonite. For this reason, stability analysis requires swelling parameters. In this analysis with sewlling behavior using the finite element method (Phase2, Rocscience). With the Swelling behavior approach in the tunnel stability analysis it will be closer to the material properties in the tunnel. Key words : Swelling, Finite Element Method, Stability, Tunnel 

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