scholarly journals ANALISIS DAMPAK PEMBUKAAN GALIAN UNTUK CONNECTING BASEMENT TERHADAP BANGUNAN EKSISTING DENGAN METODE FINITE ELEMENT

2021 ◽  
Vol 5 (2) ◽  
pp. 401
Author(s):  
Della Amelia ◽  
Inda Sumarli ◽  
Ali Iskandar
Keyword(s):  
Finite Element ◽  
Ground Surface ◽  
Model Material ◽  
Diaphragm Wall ◽  
Existing Buildings ◽  
Deep Excavation ◽  
Allowable Limit ◽  
Finite Element Program ◽  
Existing Building ◽  
Static Conditions

In a deep excavation construction that adjacent to the existing buildings there is a concern that it will have a bad impact or effect on adjacent buildings.  The effect of deep excavation induced deformation of the existing structures due to ground movements and ground surface settlement behind the wall which can cause a tilt of the building. The objective of this study is to observe the effect of deep excavation (7 storey basement) adjacent to the existing buildings with 7 and 5 storey basement located in South Jakarta. The basement is connected to the basement of the existing building so that the effect of diaphragm wall opening for connecting basement towards the substructures of the existing building is observed. This study was conducted by observing the deformation that occurs in the diaphragm of the existing building, and also observing the internal forces acting on the basement floors slabs of the existing buildings. Observations were made using a three-dimensional finite element program with the most commonly used material model for analysis of deep excavation, The Hardening Soil Model. The analysis was performed with drained conditions with phreatic calculation type and only calculated the static conditions. Results indicate that the deflection that occurs after the final stage of excavation is still within the allowable limit according to the SNI 8460:2017, which is less than 14 centimeters on the diaphragm wall of the existing buildings. Keywords: Deep Excavation; Connecting Basement; Diaphragm Wall; Hardening Soil; Finite Element AbstrakPada suatu konstruksi galian dalam yang berdekatan dengan suatu bangunan lain dikhawatirkan akan memberikan dampak atau efek yang buruk terhadap bangunan di sekitarnya. Efek dari galian dalam tersebut menyebabkan terjadinya deformasi pada struktur dari bangunan di sekitarnya akibat dari pergerakan tanah dan penurunan permukaan tanah di belakang dinding yang dapat menyebabkan bangunan tersebut menjadi miring. Tujuan dari penelitian ini yaitu untuk mengamati pengaruh pekerjaan galian dalam (basement dengan 7 lantai) yang berdekatan dengan bangunan sekitar dengan basement 5 lantai dan 7 lantai yang berlokasi di Jakarta Selatan. Basement yang dimodelkan terkoneksi dengan basement dari bangunan eksisting sehingga diamati pengaruh bukaan dinding diafragma untuk connecting basement terhadap struktur bawah bangunan eksisting. Penelitian ini dilakukan dengan melihat deformasi yang terjadi pada dinding diafragma dari bangunan eksisting, dan juga mengamati gaya-gaya dalam yang bekerja pada pelat lantai basement dari bangunan eksisting. Pengamatan dilakukan dengan menggunakan program elemen hingga tiga dimensi dengan model material yang paling umum digunakan yaitu Hardening Soil untuk analisis galian dalam. Analisis dilakukan dengan kondisi drained dengan tipe kalkulasi phreatic serta hanya memperhitungkan keadaan static. Hasil menunjukkan bahwa defleksi yang terjadi setelah tahapan terakhir pekerjaan galian dalam yaitu masih dalam batas yang diijinkan menurut SNI 8460:2017 yaitu dibawah dari 14 cm pada dinding diafragma bangunan eksisting. 

scholarly journals Numerical Analyses of Earthquake Induced Liquefaction and Deformation Behaviour of an Upstream Tailings Dam

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Muhammad Auchar Zardari ◽  
Hans Mattsson ◽  
Sven Knutsson ◽  
Muhammad Shehzad Khalid ◽  
Maria V. S. Ask ◽  
...  
Keyword(s):  
Finite Element ◽  
Seismic Event ◽  
Deformation Behaviour ◽  
Ground Surface ◽  
Tailings Dam ◽  
Limited Extent ◽  
Northern Sweden ◽  
Finite Element Program ◽  
Dynamic Analyses ◽  
Element Program

Much of the seismic activity of northern Sweden consists of micro-earthquakes occurring near postglacial faults. However, larger magnitude earthquakes do occur in Sweden, and earthquake statistics indicate that a magnitude 5 event is likely to occur once every century. This paper presents dynamic analyses of the effects of larger earthquakes on an upstream tailings dam at the Aitik copper mine in northern Sweden. The analyses were performed to evaluate the potential for liquefaction and to assess stability of the dam under two specific earthquakes: a commonly occurring magnitude 3.6 event and a more extreme earthquake of magnitude 5.8. The dynamic analyses were carried out with the finite element program PLAXIS using a recently implemented constitutive model called UBCSAND. The results indicate that the magnitude 5.8 earthquake would likely induce liquefaction in a limited zone located below the ground surface near the embankment dikes. It is interpreted that stability of the dam may not be affected due to the limited extent of the liquefied zone. Both types of earthquakes are predicted to induce tolerable magnitudes of displacements. The results of the postseismic slope stability analysis, performed for a state after a seismic event, suggest that the dam is stable during both the earthquakes.

Analysis of Soil Nailing under Earthquake Loading in Malaysia Using Finite Element Method

2014 ◽  
Vol 695 ◽  
pp. 526-529 ◽  
Author(s):  
Mohd Faiz Mohammad Zaki ◽  
Wan Amiza Amneera Wan Ahmad ◽  
Afizah Ayob ◽  
Teoh Khai Ying
Keyword(s):  
Finite Element ◽  
Static Analysis ◽  
Slope Failure ◽  
Retaining Wall ◽  
Seismic Loading ◽  
Soil Nailing ◽  
Deep Excavation ◽  
Finite Element Program ◽  
Total Displacement ◽  
Element Program

Soil nailing has become a widely accepted method and offers a practical solution towards construction of permanent retaining wall, slope stabilization and protection of existing cuts from failure. In Malaysia, soil nailing is typically performed on cut slope and installed with grouting as preventatives method due to erosion problem. However, although the effectiveness of soil nailing system may be well understood by practitioners, the slope failure and collapses of deep excavation are continuously occurs, especially for the construction in the earthquake zone. Malaysia has numerous experiences of earthquake even this country has been categorized as low seismicity group. Hence, it is become important in the scope of geotechnical engineering to analyze and study the effect of earthquake to soil nailing systems in Malaysia. Aims of this paper are to focus and study this technical issue using the application of finite element program. This research study selects PGA of 0.08g based on the location of major population in Malaysia. Safety factor was calculated in this finite element program using phi-c reduction. Soil nailing relatively give satisfactory response under seismic, so pseudo-static method is applied for seismic loading study. Based on the static analysis results, the FOS for the deep excavation stabilized with soil nailing is 1.54. However, by considering the earthquake or seismic loading, the FOS reduces to 1.16 and the percentage of reduction is about 25%. Total displacement was observed slightly difference in soil nailing analysis during an earthquake and static analysis

scholarly journals Stability Analysis and Parameter Optimization of Deep Excavation Supporting System in Granular Soils

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Manman Dong ◽  
Pengjiao Jia
Keyword(s):  
Finite Element ◽  
Least Squares Method ◽  
Ground Surface ◽  
Least Square ◽  
Critical Parameters ◽  
Economic Damage ◽  
Granular Soils ◽  
Deep Excavation ◽  
Double Row ◽  
The Stability

Deep excavations are prone to result in excessive ground surface settlement displacement of surrounding existing structures, which could cause severe economic damage, even casualties. Hence, the optimization of pile parameters and evaluation of the stability of the excavation are of paramount importance. This paper aims to evaluate the security of deep excavation and optimize the parameters of supported piles in granular soils. An excavation case in granular soils is used to evaluate the stability of deep excavation using displacement least squares method. The stability of case history, Changqingqiao subway station, using pile and inner support system is evaluated by using the least square method. Subsequently, the finite element method is used to optimize the critical parameters of the supported piles, and it needs to be emphasized that the correctness and reasonability of the finite element (FE) models are evaluated according to field measurements. The optimum pile diameter and embedment ratio for single- and double-row retaining pile are 1.0 m and 0.4. The maximum vertical displacement of surrounding soil and horizontal displacement of piles can be calculated by the equations obtained in this research which can provide useful guidance for the designing of deep excavation.

scholarly journals A study on the strengthening of buildings designed based on 3rd edition of 2800 codes by utilizing viscous dampers

2020 ◽  
Author(s):  
Himan mohammad eisa
Keyword(s):  
Stress Ratio ◽  
Relative Displacement ◽  
Existing Buildings ◽  
Viscous Dampers ◽  
Allowable Limit ◽  
Existing Building ◽  
Energy Absorbing ◽  
Existing Structure

One of the methods that have been considered in recent years for the reinforcement of structures is the use of energy-absorbing systems. A variety of energy-absorbing systems have been developed and introduced, including liquid, viscous dampers. The main purpose of this study is to evaluate the efficiency of viscous dampers in absorbing forces caused by earthquakes and seismic improvement of structures, as well as the feasibility of increasing the floors of an existing structure by using these dampers. For this purpose, three different models with fixed plans and three different numbers of floors as five, nine, and thirteen have selected, and the possibility of increasing one floor to them by using viscous dampers has investigated. The results indicated that by adding a floor to the existing buildings, the stress ratio in some columns and also the relative displacement exceeds the allowable limit; however, viscous dampers can significantly decrease the stresses and displacements and can be used to expand the number of floors of an existing building.

scholarly journals PROSES ANALISA DINDING GALIAN BASEMENT 7 LANTAI DENGAN METODE ELEMEN HINGGA

2020 ◽  
Vol 3 (1) ◽  
pp. 49
Author(s):  
Novia Sabina ◽  
Chaidir Anwar Makarim
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Water Table ◽  
Retaining Wall ◽  
Diaphragm Wall ◽  
Limited Area ◽  
Deep Excavation ◽  
Maximum Deformation ◽  
Drill Point ◽  
Story Building

Limited area for construction can be overcome by build a multi-story building with basement. Basement is quite common in Jakarta, the things that attracted is basement with 7 stories. This basement construction use a diaphragm wall with 1 meter thickness for the retaining wall and installation strut every 4 meter. Deformation for diaphragm wall is calculated by finite element method application and mohr-coloumb soil modeling. This calculation based on soil type from each drill point and water table when it high or common. From the calculation, maximum deformation diaphragm wall for BH-5 when water table high is 235,86 mm and when water table at -3 m is 209,6 mm. Maximum deformation diaphragm wall for BH-7 when water table high is213,9 mm and when water table at -3 m is 197,18 mm. There are several things that need to concern when constructed basement and deep excavation, in case to avoid failure.AbstrakKeterbatasan lahan untuk pembangunan dapat diatasi dengan pembangunan gedung bertingkat yang dilengkapi dengan basement. Pembangunan basement cukup umum di Jakarta ini, salah satu hal yang menarik perhatian adalah pembangunan basement sebanyak 7 lantai. Pembangunan basement ini menggunakan dinding penahan tanah berupa dinding diafragma dengan ketebalan 1 meter dan pemasangan strut setiap 4 meter. Perhitungan deformasi pada dinding penahan tanah ini dilakukan dengan menggunakan aplikasi metode elemen hingga dan permodelan tanah mohr-coloumb Permodelan dilakukan berdasarkan keadaan tanah pada tiap titik bor dan keadaan muka air saat banjir atau kemarau. Dari perhitungan, didapatkan deformasi maksimum dinding diafragma pada titik bor BH-5 pada muka air banjir adalah 235,86 mm dan pada muka air kemarau adalah 209,6 mm. Untuk deformasi maksimum dinding diafragma pada titik bor BH-7 pada muka air banjir adalah 213,9 mm dan pada muka air kemarau adalah 197,18 mm. Pada saat konstruksi basement dan galian dalam, diperlukan beberapa hal yang perlu diperhatikan agar tidak terjadi kegagalan pada saat pembangunan dan penggunaan basement.

scholarly journals The impact of drilling and slitting construction on damage field: evolution characteristics in low-permeability coal seam

2021 ◽  
Vol 37 ◽  
pp. 205-215
Author(s):  
Heng Chen ◽  
Hongmei Cheng ◽  
Aibin Xu ◽  
Yi Xue ◽  
Weihong Peng
Keyword(s):  
Finite Element ◽  
Rock Mass ◽  
Damage Mechanics ◽  
Effective Strain ◽  
Secondary Development ◽  
Distribution Area ◽  
Finite Element Program ◽  
Element Program ◽  
Mining Face ◽  
The Impact

ABSTRACT The fracture field of coal and rock mass is the main channel for gas migration and accumulation. Exploring the evolution law of fracture field of coal and rock mass under the condition of drilling and slitting construction has important theoretical significance for guiding efficient gas drainage. The generation and evolution process of coal and rock fissures is also the development and accumulation process of its damage. Therefore, based on damage mechanics and finite element theory, the mathematical model is established. The damage variable of coal mass is defined by effective strain, the elastoplastic damage constitutive equation is established and the secondary development of finite element program is completed by FORTRAN language. Using this program, the numerical simulation of drilling and slitting construction of the 15-14120 mining face of Pingdingshan No. 8 Mine is carried out, and the effects of different single borehole diameters, different kerf widths and different kerf heights on the distribution area of surrounding coal fracture field and the degree of damage are studied quantitatively. These provide a theoretical basis for the reasonable determination of the slitting and drilling arrangement parameters at the engineering site.

Structure-Soil Interaction of Buried Corrugated Steel Arch Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 2112-2117
Author(s):  
Miao Xin Zhang ◽  
Bao Dong Liu ◽  
Peng Fei Li ◽  
Zhi Mao Feng
Keyword(s):  
Finite Element ◽  
Steel Structures ◽  
Internal Force ◽  
Structural Deformation ◽  
Fe Model ◽  
Soil Pressure ◽  
Load Range ◽  
Finite Element Program ◽  
Load Conditions ◽  
Peak Value

Corrugated steel plate and surrounding soils are working together to share the load in buried corrugated steel structures. It is complicated to consider the structure-soil interaction, so the finite element method has already become the chief means of complicated structure analysis. Based on a practical project, considering structure-soil interaction, by using the finite element program of ANSYS, the paper set up a 2-D FE model and analyzed the soil pressure, the structural deformation and the internal force under different load conditions in detail. The analysis shows that structure-soil interaction has brought about stresses redistribution of surrounding soils, and adverse effects of soil pressure and displacement were limited. The variation range of soil pressure on the crown of arch increases with the load increases and the peak value of soil pressure approach to the code value and a rebound appears in the vehicle load range. The tendencies of vertical soil displacement are nearly the same to different load conditions, and the peak value of moments has an obvious change and can be influenced greatly by deflective load.

Finite Element Analysis on the Deformation of Energy-Saving Wire-Mesh Frame Wallboard

2014 ◽  
Vol 501-504 ◽  
pp. 731-735
Author(s):  
Li Zhang ◽  
Kang Li
Keyword(s):  
Finite Element ◽  
Energy Saving ◽  
Theoretical Basis ◽  
Steel Wire ◽  
Wire Mesh ◽  
Design Parameters ◽  
Element Analysis ◽  
Finite Element Program ◽  
Element Program ◽  
Influence Degree

This paper analyzes the influence degree of related design parameters of wire-mesh frame wallboard on deformation through finite element program, providing theoretical basis for the design and test of steel wire rack energy-saving wallboard.

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