scholarly journals Nghiên cứu sự phân bố tải trọng trong quá trình làm việc của móng bè cọc

2021 ◽  
Author(s):  
Nguyễn Ngọc Thắng ◽  
Nguyễn Trường Hải
Keyword(s):  
Plaxis 3D

Móng bè cọc ngày càng được áp dụng rộng rãi, đặc biệt là cho các tòa nhà cao tầng. Trong móng bè cọc, cọc không được thiết kế để chịu toàn bộ tải trọng mà chỉ để giảm độ lún đến một mức độ cho phép. Bài báo này trình bày nghiên cứu sử dụng kết hợp với phương pháp phần tử hữu hạn để thiết kế móng bè cọc. Kết quả nghiên cức chỉ ra rằng: phương pháp móng bè cọc như là một phương án móng thay thế. Phân tích phần mềm Plaxis 3D để xác định độ lún và hệ số phân bố tải trọng trong móng bè cọc.

scholarly journals COMPARATIVE ANALYSIS OF THE PARAMETERS OF FINITE-ELEMENT MODELS OF SOILS OBTAINED BY NUMERICAL METHODS

2017 ◽  
pp. 23-31
Author(s):  
Vladimir Ivanovich Matselya ◽  
Igor Nikolaevich Seelev ◽  
Alexey Valentinovich Lekontsev ◽  
Robert Rafaelevich Khafizov ◽  
Pavel Viktorovich Yakovlev ◽  
...  
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Numerical Methods ◽  
Small Deformation ◽  
Finite Element Models ◽  
Linear Elastic ◽  
Industrial Buildings ◽  
Test Models ◽  
Weak Points ◽  
Plaxis 3D

The popularity of numerical methods for modeling soil bases determines the increased demand for the accuracy of calculations. The choice of a model that meets the requirements of accuracy of calculations and minimization of costs is determined by comparative analysis of common soil models described in scientific literature and used in calculations of sediments and dynamic effects of buildings (finite element linear elastic, elastic, ideal-plastic, Mora - Coulomb with strengthening, elasto-plastic with strengthening at small deformation). The results have been obtained on test models using finite element method in the environment of PLAXIS 3D and SCAD Office programs. In order to compare results obtained, subject to requirements of the current regulatory documents, a comparative analysis of soils was carried out according to the model of Body of rules 22.13330.2011 "Foundations of buildings and structures". The analysis results were used for choosing an optimal model of soil bases of industrial buildings estimated in earthquake-proof design. It should be noted that the strong and weak points identified for each model justify the choice of the best model for each particular case.

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 MODELING OF THE JACKED PILE STATIC LOAD TEST WITH PLAXIS 3D / SPAUSTINIO POLIO BANDYMO STATINE APKROVA MODELIAVIMAS PLAXIS 3D

2016 ◽  
Vol 8 (5) ◽  
pp. 495-498
Author(s):  
Tautvydas Statkus
Keyword(s):  
Building Materials ◽  
Model Building ◽  
Static Load ◽  
Load Test ◽  
Static Load Test ◽  
Model Geometry ◽  
Comparison Of The Results ◽  
3D Software ◽  
Installation Technology ◽  
Plaxis 3D

In this article jacked pile installation technology and its current processes, altering the base physical and mechanical characteristics are discussed. For the jacked pile static load test simulation Plax 3D software was selected, the opportunities and developments were described. Model building, materials, models, model geometry, finite elements, boundary conditions and assumptions adopted in addressing problems described in detail. Three different tasks formulated and load-settlement dependence a comparison of the results with the experiment given. Conclusions are formulated according to the modeling results. Šiame straipsnyje aptarta spaustinių polių įrengimo technologija ir ją taikant vykstantys procesai, keičiantys pagrindo fizines ir mechanines charakteristikas. Spaustinio polio bandymui statine apkrova modeliuoti pasirinktas PLAXIS 3D programinis paketas ir aprašytos jo galimybės bei raida. Detaliai nupasakotas modelio kūrimas, medžiagų modeliai, modelio geometrija, baigtiniai elementai, kraštinės sąlygos ir priimamos prielaidos sprendžiant problemą. Suformuluoti trys sprendžiami uždaviniai ir apkrovos bei nuosėdžio priklausomybe pateikiamas rezultatų palyginimas su eksperimentu. Atsižvelgiant į modeliavimo rezultatus suformuluotos išvados.

scholarly journals Mathematical Modelling for Micropiles Embedded in Salt Rock

2016 ◽  
Vol 12 (1) ◽  
pp. 23-35
Author(s):  
Georgiana Rădan (Toader) ◽  
Nicoleta Rădulescu ◽  
Gheorghe Oancea
Keyword(s):  
Mathematical Modelling ◽  
3D Model ◽  
Three Dimensional ◽  
Salt Rock ◽  
In Situ Tests ◽  
Calibration And Validation ◽  
Plaxis 3D ◽  
2D Model ◽  
Computing Models

Abstract This study presents the results of the mathematical modelling for the micropiles foundation of an investement objective located in Slanic, Prahova county. Three computing models were created and analyzed with software, based on Finite Element Method. With Plaxis 2D model was analyzed the isolated micropile and the three-dimensional analysis was made with Plaxis 3D model, for group of micropiles. For the micropiles foundation was used Midas GTS-NX model. The mathematical models were calibrated based with the in-situ tests results for axially loaded micropiles, embedded in salt rock. The paper presents the results obtained with the three software, the calibration and validation models.

3D Numerical Analysis of Soil Structure Interaction Behaviors of Pipe Jacking Construction

2012 ◽  
Vol 204-208 ◽  
pp. 534-538 ◽  
Author(s):  
Wen Tsung Liu ◽  
Xu Yan Lu
Keyword(s):  
Numerical Analysis ◽  
Soil Structure ◽  
Soil Improvement ◽  
Ground Movement ◽  
Science Park ◽  
Tunnel Excavation ◽  
Contraction Ratio ◽  
Pipe Jacking ◽  
Interaction Behaviors ◽  
Plaxis 3D

This study is analyzed by numerical analysis using finite element method program of Plaxis-3D Tunnel at Kaohsiung Science Park in Taiwan. It probes the risk of tunneling procedure adopting pipe jacking construction (PJC) with man–made excavation. The main parameters of numerical calculation in this research include advancement size, soil improvement ratio and void contraction ratio, etc. Those parameters are calculated to displacement and stress distribution and we get ground movement, settlement at crown and heave at invert of tunnel excavation to assess the security. This study finds that it is safe by excavation using PJC with man-made while the gap has to be less than 38mm. Actually, the gap is 100 ~ 150mm under PJC with man-made, and it will result in high risk. Therefore, the PJC with shield has more security than other methods through monitoring ground settlement.

Analysis of Lightweight Concrete “Cakar Ayam” Foundation for Road Construction using Plaxis 3D Foundation Software

2014 ◽  
Vol 695 ◽  
pp. 729-733 ◽  
Author(s):  
Ahmad Hakimi Mat Nor ◽  
Aklil Hamdee Yahuda ◽  
Faizal Pakir
Keyword(s):  
Lightweight Concrete ◽  
Load Capacity ◽  
Soft Soil ◽  
Soft Clay ◽  
Road Construction ◽  
Soil Parameters ◽  
Slab Thickness ◽  
Foundation Design ◽  
Clayey Silt ◽  
Plaxis 3D

Road settlement often occurs because that soil cannot accommodate the load capacity. Therefore, the study to analysis of lightweight concrete “cakar ayam” foundation was conducted. The idea of “cakar Ayam” concept was introduced by Prof. Dr. Ir. Sediyatmo. Objective of these studies was achieved which is to determine the settlement value of lightweight concrete “Cakar Ayam” foundation design on soft clay, sand, clayey silt under the different loads. Hence, the effectiveness of lightweight concrete “cakar ayam” foundation on that soil, have been able to determined according the settlement value was obtained. Implementation of research was doing using Plaxis 3D foundation software. The foundation design was various according to the several of the column length. The slab thickness, spacing between column, foundation and column size was fixed. Soil parameters to analyse lightweight concrete “cakar ayam” foundation, was obtained from previous studies and Research Center of Soft Soil, Universiti Tun Hussien Onn Malaysia, (RECESS, UTHM). Each design was tested by different loads to get the settlement value. From the results show, the settlements value was obtained show concept of “cakar ayam” foundation, not effective to be implement on soft clay. The settlement value was over 25 mm, when the load 20 kN/m2 was applied on the foundation, to all length of column on soft clay. However, the settlement value was lower than 25 mm, when the load 40 kN/m2 was applied on the foundation, to all length of column on sand and clayey silt. From all the settlement value, it could be seen that clayey silt result was more effective than sand. The settlement value also was decrease when the length of pile was increase. In conclusion, the objective of the study was achieved.

scholarly journals Performance Analysis Of “Toga” Foundation With Cap On Thick Soft Soil Based On Laboratory Models And Finite Element Analysis

UKaRsT ◽  
2020 ◽  
Vol 4 (2) ◽  
pp. 222
Author(s):  
Melissa Kurnia ◽  
Paulus Pramono Rahardjo
Keyword(s):  
Soft Soil ◽  
Soil Conditions ◽  
Deep Foundations ◽  
3D Analysis ◽  
Element Analysis ◽  
Soil Layers ◽  
The Right ◽  
Laboratory Models ◽  
Deformation Relationship ◽  
Plaxis 3D

Various alternative foundations are offered depending on soil conditions from the results of soil investigations. In difficult soil types such as thick, soft soil layers, pile foundation is generally used to avoid the excess settlements, but deep foundations for small buildings are not the right solution when viewed from a cost perspective. One of the more economical foundations is to use the” toga” foundation, with a plate on top and a caisson underneath where the caisson can be inserted into the soil with an open end. Through this study, the carrying capacity of the” toga” foundation will be analyzed. Then the foundation will be made on a laboratory scale and tested with axial load. The load and deformation relationship were analyzed using PLAXIS 3D analysis. It can be concluded the performance of the ”toga” foundation on thick, soft soil can be used for two-floored buildings

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