scholarly journals ANALISIS DEFORMASI GALIAN DALAM PADA TITIK TEPI DINDING DIAFRAGMA DENGAN METODE ELEMEN HINGGA MELALUI STUDI EVALUASI MODEL TANAH

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Hadianti Muhdinar Pasaribu
Keyword(s):  
Diaphragm Wall ◽  
Infrastructure Development ◽  
Rapid Transit ◽  
Horizontal Deformation ◽  
Top Down ◽  
Soil Model ◽  
Coulomb Model ◽  
Soil Hardening ◽  
Hardening Soil Model ◽  
Plaxis 3D

Banyaknya pembangunan infrastruktur yang merupakan salah satu tolak ukur kemajuan suatu daerah menyebabkan terjadinya penyempitan lahan didaerah tersebut. Sehingga pemanfaatan ruang dan lahan sangat dibutuhkan untuk menunjang kemajuan pesatnya pembangunan infrastruktur. Salah satu inovasi terbaik dalam mengatasi masalah keterbatasan lahan adalah membuat bangunan bawah tanah sehingga memberi ruang yang lebih untuk pembangunan. Pembangunan yang cukup terbaru di Indonesia saat ini adalah pembangunan MRT (Mass Rapid Transit) yang dilakukan di Jakarta. Pembangunan ini dalam pelaksanaannya membutuhkan proses konstruksi terowongan (tunneling) dan galian dalam untuk tiap stasiunnya. Pada penelitian ini, penulis terpusat terhadap masalah galian dalam pada stasiun Senayan dari proyek konstruksi MRT Jakarta. Permasalahan terbesar dalam suatu pekerjaan galian dalam adalah adanya deformasi lateral pada dinding bangunan bawah tanah dalam hal ini yang digunakan adalah dinding diafragma (D-Wall) dan juga adanya penurunan tanah disekitar galian. Oleh karena itu, perlu dilakukan pengecekan agar tidak terjadi keruntuhan. Metode konstruksi yang digunakan pada stasiun Senayan adalah metode konstruksi Top-Down. Pada penelitian ini dilakukan analisis deformasi horizontal dan penurunan tanah menggunakan software Plaxis 3D dengan dua pemodelan tanah, yaitu model tanah Mohr Coulomb dan Hardening Soil. Hasil deformasi horizontal yang diperoleh menggunakan model tanah Hardening Soil lebih mendekati  monitoring dilapangan dibandingkan dengan model tanah Mohr-Coulomb. Penelitian ini berfokus pada bagian-bagian tepi pada dinding diafragma melengkapi jurnal sebelumnya yang berfokus pada titik tengah dari dinding diafragma. Besarnya deformasi horizontal pada tahap akhir galian (penimbunan kembali tanah hingga dasar muka tanah) di titik P#80 (di tepi dinding diafragma) tercatat pada monitoring inclinometer sebesar 4.15 mm, dan deformasi yang dihasilkan menggunakan model Hardening Soil sebesar 9.57 mm sedangkan  menggunakan model Mohr-Coulomb sebesar 16.05 mm. Hasil deformasi horizontal yang diperoleh menggunakan model tanah Hardening Soil lebih mendekati  monitoring dilapangan dibandingkan dengan model tanah Mohr-Coulomb meskipun hasil yang diperoleh cukup jauh dari monitoring dilapangan.  Kata Kunci : Galian Dalam, Deformasi Horizontal, Model Mohr Coulomb, Model Hardening Soil, Plaxis 3D  The number of infrastructure development which is one of the benchmarks of the progress of a region causes the narrowing of land in the area. So that the utilization of space and land is needed to support the rapid progress of infrastructure development. One of the best innovations in overcoming the problem of land limitations is to make the underground building giving more space for development. The most recent development in Indonesia today is the construction of MRT (Mass Rapid Transit) conducted in Jakarta. This development in its implementation requires tunneling and deep trenching process for each station. In this study, the authors centered on the deep trenching problems at the Senayan station from the Jakarta MRT construction project. The biggest problem in a deep trenching work is the lateral deformation of underground building walls in this case which is used diaphragm wall (D-Wall) and also the decrease of soil around the excavation. Therefore, it is necessary to check to avoid collapse. The construction method used in Senayan station is a Top-Down construction method. In this research, horizontal deformation and soil degradation analysis using Plaxis 3D software with two soil modeling, Mohr Coulomb and Hardening Soil soil model. The result of the horizontal deformation obtained using Soil Hardening Soil model is closer to monitoring the field compared to the Mohr-Coulomb soil model. This study focuses on the edges of the diaphragm wall complementing the previous journal focusing on the midpoint of the diaphragm wall. The magnitude of the horizontal deformation at the final stages of excavation (backfill) to P # 80 (on the edge of the diaphragm wall) was recorded in inclinometer monitoring of 4.15 mm, and the resulting deformation using the Hardening Soil model of 9.57 mm while using the Mohr model -Coulomb of 16.05 mm. The horizontal deformation results obtained using the Soil Hardening Soil model is closer to the field monitoring than the Mohr-Coulomb soil model although the results obtained are quite far from the field monitoring.Keywords: Deep Excavation, Horizontal Deformation, Mohr Coulomb Model, Hardening Soil Model, Plaxis 3D.

scholarly journals Mohr-Coulomb and Hardening Soil Model Comparison of the Settlement of an Embankment Dam

2019 ◽  
Vol 9 (5) ◽  
pp. 4654-4658 ◽  
Author(s):  
A. H. Bhutto ◽  
S. Zardari ◽  
M. A. Zardari ◽  
G. S. Bhurgri ◽  
B. A. Memon ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Modulus Of Elasticity ◽  
Model Comparison ◽  
Embankment Dam ◽  
Sandy Gravel ◽  
Soil Model ◽  
Settlement Behavior ◽  
Coulomb Model ◽  
Clay Core ◽  
Hardening Soil Model

In this study, numerical analysis of an embankment dam was carried out to predict settlement behavior with the use of the Mohr-Coulomb Model (MCM) and of the Hardening Soil Model (HSM). The MCM was applied to all material zones of the dam and the HSM was used for four major material zones that occupied significant volume. The settlement response of the dam was similar for MCM and HSM for three material zones (clay core, sandy gravel and random fill), each having a modulus of elasticity (MOE) in the range of 25000 to 50000kPa. However, it was found that after the end of the construction, the MCM showed about 57% and 50% more settlement as compared to HSM when MOE of sandy siltstone varied from 70000 to 125000kPa respectively. The results regarding the dam settlement predicted with the HSM are in agreement with the findings in previous studies.

scholarly journals Numerical simulation with hardening soil model parameters of marine clay obtained from conventional tests

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Samaila Saleh ◽  
Nor Zurairahetty Mohd Yunus ◽  
Kamarudin Ahmad ◽  
Khairun Nissa Mat Said
Keyword(s):  
Triaxial Compression ◽  
Practical Importance ◽  
Model Parameters ◽  
Strength Parameters ◽  
Marine Clay ◽  
Loading Test ◽  
Soil Model ◽  
Laboratory Results ◽  
Hardening Soil Model ◽  
Plaxis 3D

AbstractOver the last decades, numerical modelling has gained practical importance in geotechnical engineering as a valuable tool for predicting geotechnical problems. An accurate prediction of ground deformation is achieved if models that account for the pre-failure behaviour of soil are used. In this paper, laboratory results of the consolidated drain (CD) triaxial compression tests and one-dimensional consolidation tests of marine clay were used to determine the hardening soil model (HSM) parameter for use in Plaxis 3D analyses. The parameters investigated for the HSM were stiffness, strength and advanced parameters. The stiffness parameters were secant stiffness in CD triaxial compression test ($$E_{50}^{\text{ref}}$$ E 50 ref ), tangent stiffness for primary oedometer loading test $$(E_{\text{oed}}^{\text{ref}} )$$ ( E oed ref ) , unloading/reloading stiffness $$(E_{\text{ur}}^{\text{ref}}$$ ( E ur ref ) and power for the stress-level dependency of stiffness (m). The strength parameters were effective cohesion ($$c_{\text{ref}}^{\text{'}}$$ c ref ' ), effective angle of internal friction ($$\phi^{\text{'}}$$ ϕ ' ) and angle of dilatancy ($$\psi^{\text{'}}$$ ψ ' ). The advanced parameters were Poisson’s ratio for unloading–reloading (ν) and K0-value for normal consolidation $$\left( {K_{\circ}^{\text{nc}} } \right)$$ K ∘ nc . Furthermore, Plaxis 3D was used to simulate the laboratory results to verify the effectiveness of this study. The results revealed that the stiffness parameters $$E_{50}^{\text{ref}} , E_{\text{oed}}^{\text{ref}} , E_{\text{ur}}^{\text{ref}}$$ E 50 ref , E oed ref , E ur ref and m are equal to 3.4 MPa, 3.6 MPa, 12 MPa and 0.7, respectively, and that the strength parameters $$c_{\text{ref}}^{\text{'}}$$ c ref ' , $$\phi^{\text{'}}$$ ϕ ' , $$\psi^{\text{'}}$$ ψ ' and $$K_{\circ}^{\text{nc}}$$ K ∘ nc are equal to 33 kPa, 17.51°, 1.6° and 0.7, respectively. A final comparison of the laboratory results with the numerical results revealed that they were in accordance, which proved the efficacy of the study.

Numerical Simulation of Subway Station Constructed Using Top-Down Method

2012 ◽  
Vol 446-449 ◽  
pp. 3757-3761
Author(s):  
Tie Cheng Wang ◽  
Xing Hua Du ◽  
Hai Long Zhao
Keyword(s):  
Internal Force ◽  
Diaphragm Wall ◽  
Subway Station ◽  
Horizontal Plate ◽  
Horizontal Deformation ◽  
Soil Pressure ◽  
Top Down ◽  
Deformation Curves ◽  
Stress And Deformation ◽  
Station Structure

This paper mainly deals with the stress and deformation behavior of the subway station structure during the excavation, the construction of the station constructed using top-down method is simulated with ANSYS. The research results show that the diaphragm wall, column and horizontal plate uplift and sink alternately under the influence of foundation rebound, gravity and construction load. Under the influence of lateral soil pressure and horizontal plate, the horizontal deformation curves of the diaphragm wall is similar to bow at first and then to s shape. The huge horizontal stiffness of the plate can control the horizontal deformation of the diaphragm wall effectively. The most disadvantageous positions of internal force in each condition are shown finally, and the results can be referenced by similar engineering.

Seismic Responses of Zoned Earth-Fill Dam by Instrumentation and Finite Element Simulation

2016 ◽  
Vol 11 (6) ◽  
pp. 1271-1279
Author(s):  
Sirikanya Laosuwan ◽  
◽  
Tawatchai Tanchaisawat ◽  
Keyword(s):  
Finite Element ◽  
Northern Region ◽  
Elastic Model ◽  
Linear Elastic ◽  
Soil Model ◽  
Linear Elastic Model ◽  
Coulomb Model ◽  
Seismic Accelerations ◽  
The One ◽  
Hardening Soil Model

Natural disasters recently occurred in the northern region of Thailand have been increasingly becoming an important issue with emphasis on the alarm and caution for damage and frequency of disasters which may cause major losses of human lives and properties. In May 2014, six provinces in the northern region of Thailand were affected by the earthquakes (the main shock of Mw 6.1 (Moment Magnitude by USGS) and hundreds of aftershocks including the one Mw 5.9 at most) that had the epicenters at Phan District, Chiang Rai Province (19.656°N 99.670°E). This research aimed to study the distribution of seismic accelerations at Mae Ngad Somboon Chon Dam in Chiang Mai. The accelerometers were installed at 3 positions in the dam, consisting of the crest, middle and base of the dam. The collected data were compared and analyzed by the Finite Element Method. Analyses of the Linear Elastic Model, the Mohr-Coulomb Model and the Hardening Soil Model with using the acceleration actually recorded at the dam were conducted to determine an appropriate analytical model. The results indicated that the accelerations obtained from the Hardening Soil Model were more suitable for actual accelerations among others. Therefore the behavior of the Hardening Soil Model is more realistic than that of the Linear Elastic Model or the Mohr-Coulomb Model.

Coupling hardening soil model and Ménard pressuremeter tests to predict pile behavior

2021 ◽  
pp. 1-20
Author(s):  
Heitor Cardoso Bernardes ◽  
Maurício Martines Sales ◽  
Romulo Rodrigues Machado ◽  
Aleones José da Cruz Junior ◽  
Renato Pinto da Cunha ◽  
...  
Keyword(s):  
Soil Model ◽  
Hardening Soil Model

scholarly journals Settlement Response of a Multi-Story Building

2020 ◽  
Vol 10 (5) ◽  
pp. 6220-6223
Author(s):  
A. H. Bhutto ◽  
G. S. Bhurgri ◽  
S. Zardari ◽  
M. A. Zardari ◽  
B. A. Memon ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Soil Properties ◽  
Modulus Of Elasticity ◽  
Stress Strain ◽  
Settlement Calculation ◽  
Allowable Range ◽  
Reliable Representation ◽  
Coulomb Model ◽  
Story Building ◽  
Hardening Soil Model

The settlement calculation of a multi-story building is a challenging task due to the variation of soil properties and the use of an appropriate constitutive model for the reliable representation of soils’ stress-strain behaviors. In this study, the settlement response of a multi-story building was calculated with the simple Mohr-Coulomb Model (MCM) and the Hardening Soil Model (HSM). The effect of soil modulus of elasticity using both models was investigated on the overall settlement response of the building. Results indicated that MCM overestimated immediate settlement in a range of 50 to 65% compared to HSM. The settlement response of the building calculated with both models was within the allowable range. The results of this study can be helpful for geotechnical engineers working on reliable predictions of the settlement of multi-story buildings.

scholarly journals Strength and stiffness parameters for hardening soil model of rockfill materials

2021 ◽  
Author(s):  
Raksiri Sukkarak ◽  
Suched Likitlersuang ◽  
Pornkasem Jongpradist ◽  
Pitthaya Jamsawang
Keyword(s):  
Soil Model ◽  
Rockfill Materials ◽  
Strength And Stiffness ◽  
Hardening Soil Model
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