scholarly journals SOIL IMPROVEMENT METHODS USING MINIPILE FOR REDUCING SETTLEMENT VALUE IN HIGHWAY TOLL KERTOSONO – KEDIRI

INFOMANPRO ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 41-53
Author(s):  
Ardha Rahadian1 ◽  
Lalu Mulyadi ◽  
Lies K. Wulandari
Keyword(s):  
Safety Factor ◽  
Laboratory Testing ◽  
Soft Soil ◽  
Soil Improvement ◽  
Design Criteria ◽  
Testing Material ◽  
Time Schedule ◽  
Technical Point ◽  
Calculation Results ◽  
Time Required

A highway toll project is an urgent need in this modernization era, especially in our country, which currently has a population of around 250 million people. From the population that has been increasing, In the current era the need for transportation is also growing rapidly, Therefore, a safe and comfortable transportation is needed. Relationship with the occurred of soft soil in the STA. 18 + 000 to STA. 20 + 300, the authors need to provide an analyzing way of handling the soft soil in order to meet the criteria for the settlement criteria. Meanwhile, the purpose of making analysis soft soil improvement using minipile is to find out a technical point still meets the requirements stated in the design criteria. To achieve this goal, analysis of the soft soil improvement in carrying out the analysis and calculations was taken from the results analysis of the N-SPT value and laboratory testing material from the soil investigation of the borehole. The calculation results obtained are in the soil improvement methods at the location which was originally using a minipile it can reduce settlement value < 20 mm/years, safety factor in earthquake condition > 1.10 and time schedule for implementation pilling work on site 1 month faster than the time required when using another methods for each location that has of soft soil content, especially in the section STA. 18 + 000 to STA. 20 + 300.

scholarly journals METODE VACUUM CONSOLIDATION DENGAN PRELOADING UNTUK MEMPERCEPAT KONSOLIDASI TANAH PADA PERUMAHAN DI TANGERANG

2021 ◽  
Vol 4 (1) ◽  
pp. 171
Author(s):  
Jason Sastilaya ◽  
Gregorius Sandjaja Sentosa
Keyword(s):  
Pore Water Pressure ◽  
Water Pressure ◽  
Soft Soil ◽  
Drainage System ◽  
Soil Condition ◽  
Soil Improvement ◽  
Soil Conditions ◽  
Soil Plasticity ◽  
Calculation Results ◽  
Long Time

The expansion of housing in big cities cannot be denied given the rapid population growth in Indonesia. One of the areas that is currently expanding housing is Kosambi City, Tangerang. Soil conditions in Kosambi City are soft soil with high moisture content and soil plasticity, low permeability and soil bearing capacity, and high pore water pressure. This soft soil condition makes the consolidation decline take a very long time. To overcome the problem of the length of time for this consolidation settlement, it is necessary to improve the land. Soil improvement is being carried out, namely the method of vaccum consolidation with preloading. The combination of these methods is carried out by installing a vertical drainage system in the form of prefabricated fabricated drain (PVD) in soft soil, then the initial load is given in the form of preloading on the soil. The calculation results show that the amount of consolidation reduction that occurs when clay soil is loaded with a stockpile of 1.2 m high, a water surcharge of 1.3 m and a vaccum load is 0.3929 m and 0.6968 m for 85 years. The combined method of preloading and PVD is proven to be able to accelerate the time of consolidation, where Preloading and PVD are installed in a triangle pattern between 0.80 m to a depth of 12 m, capable of achieving a consolidation degree of 90% within 8 weeksPerluasan perumahan di kota besar tentu tidak dapat dipungkiri mengingat pesatnya pertumbuhan penduduk di Indonesia. Salah satu daerah yang sedang dilakukan perluasan perumahan yaitu Kosambi City, Tangerang. Kondisi tanah di Kosambi City merupakan tanah lunak dengan kadar air dan plastisitas tanah yang tinggi, permeabilitas dan daya dukung tanah yang rendah, serta tingginya tekanan air pori. Kondisi tanah lunak ini membuat penurunan konsolidasi membutuhkan waktu yang sangat lama. Untuk mengatasi masalah lamanya waktu penurunan konsolidasi ini, perlu dilakukan perbaikan tanah. Perbaikan tanah yang dilakukan yaitu metode vaccum consolidation dengan preloading. Kombinasi pada metode ini dilakukan dengan cara memasang sistem drainase vertikal berupa prefabricated fabricated drain (PVD) di dalam tanah lunak, kemudian diberikan beban awal yaitu berupa timbunan (preloading) pada tanah tersebut. Hasil perhitungan menunjukkan besar penurunan konsolidasi yang terjadi jika tanah lempung dibebani dengan timbunan setinggi 1,2 m, water surcharge setinggi 1,3 m dan beban vaccum  adalah 0,3929 m dan 0,6968 m selama 85 tahun. Metode kombinasi preloading dan PVD terbukti mampu mempercepat waktu konsolidasi, dimana Preloading dan PVD dipasang dengan pola segitiga berjarak 0,80 m hingga kedalaman 12 m, mampu mencapai derajat konsolidasi 90% dalam waktu 8 minggu. 

scholarly journals Analisis Stabilitas pada Perbaikan Tanah Lunak Metode Preloading dengan Menggunakan Metode Elemen Hingga. (Hal. 1-9)

2019 ◽  
Vol 5 (3) ◽  
pp. 1
Author(s):  
Erdina Tyagita Utami ◽  
Indra Noer Hamdhan ◽  
Kabul Suwitaatmadja
Keyword(s):  
Safety Factor ◽  
Ground Improvement ◽  
Soft Soil ◽  
Soil Improvement ◽  
Soil Stability ◽  
Field Modeling ◽  
The Stability ◽  
Two Stages ◽  
Minimum Safety Factor ◽  
Preloading Method

ABSTRAKTanah lunak merupakan tanah dengan stabilitas rendah yang dapat mengalami penurunan yang besar saat diberi beban. Preloading adalah salah satu cara memperbaiki tanah lunak tersebut. Penelitian ini bertujuan untuk mengetahui stabilitas tanah lunak akibat perbaikan tanah menggunakan preloading. Pemodelan dilakukan dengan cara menghitung kenaikan kuat geser tanah. Untuk mencari faktor keamanan dan bidang longsor dilakukan pemodelan dengan menggunakan Metode Elemen Hingga Plaxis 2D dengan pembebanan 2 tahap. Pembebanan pertama yang dilakukan adalah setinggi 5 meter dan pembebanan ke dua yaitu setinggi 1-2 meter. Jarak perbaikan tanah juga dimodelkan dalam penelitian ini sejauh 5 meter, 10 meter, dan 15 meter dari sisi lokasi  timbunan batu bara. Batasan faktor keamanan (SF) minimum terhadap keruntuhan adalah 1,5. Perbaikan tanah dengan metode preloading menyebabkan tanah akan memampat dan dapat stabil dalam menerima beban.Kata kunci: tanah lunak, stabilitas tanah, preloading, faktor keamanan, metode elemen hingga ABSTRACTSoft soils are soils with low stability which can experience a large settlement under loading process. Preloading is one of the ways to improve the soft soil. This study aims to determine the stability of soft soils due to soil improvement using preloading. Modeling is done by calculating the increase in soil shear. To find the safety factor and the landslide field, modeling is done using Finite Element Method 2D Plaxis by two stages of loading. The first loading is 5 meters high and the second loading is 1-2 meters. Ground improvement distances are also modeled in this study as far as 5 meters, 10 meters and 15 meters from the side of the location of the coal emankment. The minimum safety factor (SF) limit to collapse is 1.5. Improvement of the soil using the preloading method causes the soil to compress and can be stable in receiving loads.Keywords: soft soil, soil stability, preloading, safety factor, finite elemen method

scholarly journals ANALISIS MODEL KEGAGALAN KONSTRUKSI RUMAH TINGGAL 2 LANTAI AKIBAT RANGKAK DI BAWAH LERENG TIMBUNAN

2021 ◽  
Vol 4 (3) ◽  
pp. 671
Author(s):  
Jeffri Ardianto ◽  
Chaidir Anwar Makarim
Keyword(s):  
Ground Water ◽  
Safety Factor ◽  
Construction Projects ◽  
Soft Soil ◽  
Water Levels ◽  
Shallow Foundation ◽  
Silty Clay ◽  
Maximum Settlement ◽  
Equilibrium Limit ◽  
Calculation Results

Construction of houses on slopes certainly has risks that can cause landslides on the slopes. One of the construction projects on slope area experienced a construction failure which caused the destruction of a 2-storey house. It is suspected that the planning of the building did not take into account the optimal rainfall. The author makes a model analysis similar to that case using a shallow foundation. The subgrade in this case is soft soil from rice fields which is then backfilled with silty clay. The soft soil beneath this embankment experiences creep, where the soil continues to move slowly even without a load. The author analyzes the settlement due to creep manually. The author also analyzes the safety factor of slope stability due to rising ground water levels. Based on the calculation results, the settlement was obtained at 14,8456 cm which is almost close to the maximum settlement limit of 15 cm. While the safety factor obtained from the application of the equilibrium limit before the rain is 1,311 but after experiencing a 5 m increase in ground water the safety factor is 1,032 which is less than 1,25.Keywords: creep, settlement, shallow foundation, slope stabilityPembangunan rumah di daerah lereng tentu memiliki risiko yang dapat menyebabkan kelongsoran pada daerah lereng. Salah satu proyek pembangunan pada suatu daerah lereng mengalami kegagalan konstruksi yang menyebabkan hancurnya rumah tinggal 2 lantai. Diduga dalam perencanaan bangunan tidak memperhitungkan curah hujan optimal. Penulis membuat analisis model yang mirip dengan kasus tersebut dengan menggunakan fondasi dangkal. Tanah dasar pada kasus ini adalah tanah lunak bekas persawahan yang kemudian di timbun dengan tanah lempung kelanauan. Tanah lunak di bawah tanah timbunan ini mengalami rangkak yang dimana tanah terus bergerak secara lambat walaupun tanpa adanya beban. Penulis menganalisis penurunan akibat dari rangkak secara manual. Penulis juga menganalisis faktor keamanan kestabilan lereng akibat dari naiknya muka air tanah. Berdasarkan hasil perhitungan, penurunan total terbesar diperoleh sebesar 14,8456 cm yang hampir mendekati batas penurunan maksimum 15 cm. Sedangkan faktor keamanan yang diperoleh dari aplikasi kesetimbangan batas sebelum hujan sebesar 1,311 tetapi setelah mengalami kenaikan muka air tanah 5 m faktor keamanannya sebesar 1,187 yang dimana faktor keamanan kurang dari 1,25.Kata kunci: rangkak, penurunan tanah, fondasi dangkal, kestabilan lereng

scholarly journals PLANNING OF SOFT SOIL IMPROVEMENT WITH PRELOADING AND PREFABRICATED VERTICAL DRAIN METHOD

2018 ◽  
Vol 2 (01) ◽  
pp. 19
Author(s):  
Ana Crosita Ningsih ◽  
Luthfi Amri Wicaksono ◽  
Mokhamad Farid Ma'ruf
Keyword(s):  
Urban Areas ◽  
Soil Structure ◽  
Soft Soil ◽  
Soil Improvement ◽  
Building Site ◽  
Planning Time ◽  
Coral Sand ◽  
Rapid Construction ◽  
Prefabricated Vertical Drain ◽  
Surrounding Areas

The northern coastal areas of Java such as Gresik and surrounding areas have a soil structure of alluvium consisting of gravel / coral, sand, clay soil and shells. Soil basic conditions are soft enough to cause land subsidence (settlement). The need for rapid construction causes the urban areas to become less and more for development land. This requires the improvement of soft soil to be used as a building site. As for the method to be done in this planning using a combination of preloading and PVD methods to accelerate the process of land degradation. Based on the planning result, the total height of embankment (preloading) is 3.5 m and the planning time lasted 4 months. Soft soil improvement is done up to 25 m depth with PVD design using triangle pattern and space 1.3 m. The 95% consolidation decrease due to the load of embankment caused the soil to fall as deep as 1,928 m. In this planning use modeling Plaxis 8.6 2D and the resulting yield of soil is 1,990 m. Wilayah pesisir pantai utara Jawa seperti daerah Gresik dan sekitarnya mempunyai struktur tanah berupa alluvium yang terdiri dari batu kerikil/koral, pasir, tanah lempung dan pecahan kulit kerang. Kondisi tanah dasar yang cukup lunak menyebabkan terjadinya penurunan tanah (settlement). Adanya kebutuhan konstruksi yang semakin pesat menyebabkan wilayah perkotaan menjadi semakin sedikit untuk dijadikan lahan pembangunan. Hal ini mengharuskan dilakukannya upaya perbaikan tanah lunak agar bisa dijadikan lahan bangunan nantinya. Adapun pada metode yang akan dilakukan pada perencanaan ini menggunakan kombinasi metode preloading dan PVD untuk mempercepat proses penurunan tanah. Berdasarkan hasil perencanaan didapatkan total tinggi timbunan (preloading) adalah 3,5 m dan waktu perencanaan berlangsung 4 bulan. Perbaikan tanah lunak dilakukan sampai dengan kedalaman 25 m dengan desain PVD menggunakan pola segitiga dan spasi 1,3 m. Penurunan konsolidasi 95% akibat beban timbunan menyebabkan tanah turun sedalam 1,928 m. Pada perencanaan ini menggunakan pemodelan Plaxis 8.6 2D dan hasil penurunan tanah yang dihasilkan adalah sedalam 1,990 m.

scholarly journals ANALISIS PENGGUNAAN PREFABRICATED VERTICAL DRAINS (PVD) PADA TANAH LEMPUNG LUNAK YANG TERDAPAT LAPISAN LENSA

2020 ◽  
Vol 3 (1) ◽  
pp. 119
Author(s):  
Andreyan Prasetio ◽  
Aniek Prihatiningsih
Keyword(s):  
Soft Soil ◽  
Soil Improvement ◽  
Cohesive Soils ◽  
Consolidation Process ◽  
Prefabricated Vertical Drains ◽  
Soil Layers ◽  
Vertical Drains ◽  
Vertical Drain ◽  
Installation Depth ◽  
Consolidation Time

Problem that often occurs in soft cohesive soils is settlement caused by consolidation process. If  construction activities doing when the soils has not been consolidated, settlement can occur. To accelerate  the consolidation process, soil improvement are usually do, one method of soil improvement to accelarate the consolidation process is vertical drain using prefabricated vertical drains (PVD). The soft soil layers in the field are not always continuous, sometimes found soft soil layers that have a lens layer. In this study, will discuss about the settlement and consolidation time of soft  soil layers that have a lens layer which has been improved by PVD with 1 meter distance. Infrastructure that stand on a location that is installed by PVD is taxiway and loading by Airbus A380 aircraft of 18,22ton/m2. Analysis using the 1 dimensional consolidation theory of Terzaghi. For PVD installation to a depth of 50 meters, preloading settlement of 234,80 cm with a consolidation time of  2260 days for the square pattern PVD and 1918 days for triangle pattern PVD. Post loading settlement for PVD installation depth of 50 meters by 2,50 cm. AbstrakMasalah yang sering terjadi pada tanah kohesif dan lunak adalah penurunan yang disebabkan proses konsolidasi. Penurunan dapat menyebabkan keretakan pada struktur konstruksi yang berada di atasnya. Jika suatu kegiatan konstruksi dilakukan saat tanah belum terkonsolidasi, maka konstruksi tersebut dapat mengalami penurunan.. Untuk mempercepat proses konsolidasi biasanya dilakukan perbaikan tanah, salah satu metode perbaikan tanah untuk mempercepat proses konsolidasi yaitu vertical drain dengan menggunakan prefabricated vertical drains (PVD). Lapisan tanah lunak yang terdapat di lapangan tidak selalu kontinu, terkadang ditemukan lapisan tanah lunak yang terdapat lapisan lensa. Pada penelitian ini, penulis akan membahas mengenai waktu konsolidasi yang dibutuhkan oleh lapisan tanah kohesif dan lunak yang terdapat lapisan lensa yang telah diperbaiki dengan menggunakan PVD berjarak 1 meter. Infrastruktur yang berdiri di atas lokasi yang dipasang PVD berupa taxiway dengan beban berupa pesawat Airbus A380 sebesar 18,22 ton/m2. Analisis dilakukan menggunakan teori konsolidasi 1 dimensi Terzaghi. Untuk pemasangan PVD hingga kedalaman 50 meter diperoleh penurunan pra pembebanan sebesar 234,80 cm dengan waktu konsolidasi selama 2260 hari untuk pemasangan PVD pola persegi dan selama 1918 hari untuk pola segitiga . Penurunan pasca pembebanan untuk pemasangan PVD hingga kedalaman 50 meter sebesar 2,5 cm.

Study on the Stratum Displacement Changes Caused by the Vertical Shaft Construction in Saturated Ultra Soft Soil

2012 ◽  
Vol 170-173 ◽  
pp. 1005-1012
Author(s):  
Lin You Pan ◽  
Xiao Bing Li ◽  
Chuang Yu ◽  
Fu Xue Sun
Keyword(s):  
Soft Soil ◽  
Field Tests ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Soil Disturbance ◽  
Soil Parameters ◽  
Finite Element Software ◽  
Total Displacement ◽  
Calculation Results ◽  
Engineering Information

In view of Wenzhou saturated super soft soil, This article studied the influence of different soil parameters for the shaft excavation construction and the stratum displacement change law by using Plaxis finite element software, according to the data obtained in field tests. The considered factors included the lateral brace stiffness, the stiffness of the underground diaphragm wall, and the surrounding soil disturbance. The calculation results provided much important engineering information, such as the horizontal displacement nephogram, the vertical displacement nephogram and the total displacement incremental vector diagram of each construction steps, which can be referred for the construction of the similar underground projects in soft soil areas.

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