Pile Foundations under Dynamic Loads

2021 ◽  
pp. 264-303
Author(s):  
Swami Saran
Keyword(s):  
Pile Foundations ◽  
Dynamic Loads

Behaviour of model pile foundations under dynamic loads in saturated sand

2016 ◽  
Vol 15 (4) ◽  
pp. 1355-1373 ◽  
Author(s):  
Y. S. Unsever ◽  
T. Matsumoto ◽  
K. Esashi ◽  
S. Kobayashi
Keyword(s):  
Pile Foundations ◽  
Dynamic Loads ◽  
Saturated Sand ◽  
Model Pile

Investigation of the operation of pile foundations with dynamic loads

1992 ◽  
Vol 29 (6) ◽  
pp. 203-204
Author(s):  
S. I. Grib ◽  
Yu. P. Khmelev ◽  
V. N. Shabanov ◽  
V. A. Ulyashinskii
Keyword(s):  
Pile Foundations ◽  
Dynamic Loads

scholarly journals Measurement and Analysis of Horizontal Vibration Response of Pile Foundations

2007 ◽  
Vol 14 (2) ◽  
pp. 89-106 ◽  
Author(s):  
A. Boominathan ◽  
R. Ayothiraman
Keyword(s):  
Dynamic Load ◽  
Power Plants ◽  
Experimental Studies ◽  
Bending Moment ◽  
Vibration Response ◽  
Pile Foundations ◽  
Dynamic Loads ◽  
Horizontal Vibration ◽  
Single Piles ◽  
Pile Length

Pile foundations are frequently used in very loose and weak deposits, in particular soft marine clays deposits to support various industrial structures, power plants, petrochemical complexes, compressor stations and residential multi-storeyed buildings. Under these circumstances, piles are predominantly subjected to horizontal dynamic loads and the pile response to horizontal vibration is very critical due to its low stiffness. Though many analytical methods have been developed to estimate the horizontal vibration response, but they are not well validated with the experimental studies. This paper presents the results of horizontal vibration tests carried out on model aluminium single piles embedded in a simulated Elastic Half Space filled with clay. The influence of various soil and pile parameters such as pile length, modulus of clay, magnitude of dynamic load and frequency of excitation on the horizontal vibration response of single piles was examined. Measurement of various response quantities, such as the load transferred to the pile, pile head displacement and the strain variation along the pile length were done using a Data Acquisition System. It is found that the pile length, modulus of clay and dynamic load, significantly influences the natural frequency and peak amplitude of the soil-pile system. The maximum bending moment occurs at the fundamental frequency of the soil-pile system. The maximum bending moment of long piles is about 2 to 4 times higher than that of short piles and it increases drastically with the increase in the shear modulus of clay for both short and long piles. The active or effective pile length is found to be increasing under dynamic load and empirical equations are proposed to estimate the active pile length under dynamic loads.

scholarly journals REDUCTION VIBRATIONS OF THE PILE FOUNDATIONS FOR MACHINES UNDER DYNAMIC LOADS BY HIGH-PRESSURE GROUP INJECTION METHOD

2020 ◽  
Vol 11 (1) ◽  
pp. 41-52
Author(s):  
M. L Nuzhdin ◽  
L. V Nuzhdin
Keyword(s):  
High Pressure ◽  
Pile Foundation ◽  
Soil Mass ◽  
Pile Foundations ◽  
Dynamic Loads ◽  
Pressure Group ◽  
Joint Work ◽  
Kinematic Excitation ◽  
Vertical Vibrations ◽  
Vibration Parameters

The vibration parameters of the foundations under dynamic loads or kinematic excitation directly depend on the stiffness and damping parameters of the base, the mass of the oscillating system consisting foundation, the machine and the «attached mass of soil». In the process of using pile foundations static load is transferred to the piles, the contact of the grillage with the ground is broken, and micro-gaps are formed. Micro-gaps impede the joint work of the soil mass of the inter-pile space with the foundation. An effective way to reduce the vibration parameters of foundations is the method of high-pressure group injection. The essence of the method lies in injection of a mobile cement-sand mortar into the soil base under the sole of the grillage under pressure exceeding the structural strength of the soil simultaneously through several injectors. The injection mixture eliminates micro-gaps and hardens the soil, which leads to an increase in the rigidity of the base and the involvement of an additional volume of soil mass in joint work with the foundation. The inclusion of inter-pile soil in joint work significantly increases the mass of the oscillating system and, as a result, reduces the parameters of horizontal and vertical vibrations of the pile foundation under dynamic loading and in the case of kinematic excitation. Injectors are immersed under the sole of the grillage through specially provided openings - injection conductors. The discharge points are usually located between piles and around the perimeter of the grillage. The parameters of the injection work (the number of injection points and their placement in the plan, the height of the injection horizons, the required volume of injected solution, the injection sequence, etc.) are assigned depending on the construction of the pile foundation, the engineering and geological conditions of the site, the dynamic operating mode of the equipment, and others factors. Strengthening pile foundations for machines under dynamic loads or vibration-sensitive equipment by high-pressure group injection can significantly reduce the amplitude of horizontal and vertical vibrations of foundations.

Study of the dynamics of ТПА 350 automatic mill working stand elements

2020 ◽  
Vol 76 (8) ◽  
pp. 830-840
Author(s):  
S. R. Rakhmanov ◽  
V. V. Povorotnii
Keyword(s):  
Mechanical System ◽  
Dynamic Model ◽  
Maximum Amplitude ◽  
Calculation Scheme ◽  
Dynamic Loads ◽  
Forced Oscillations ◽  
Mass Model ◽  
Automatic Mill ◽  
Hollow Billet ◽  
Oscillation Movement

To form a necessary geometry of a hollow billet to be rolled at a pipe rolling line, stable dynamics of the base equipment of the automatic mill working stand has a practical meaning. Among the forces, acting on its parts and elements, significant by value short-time dynamic loads are the least studied phenomena. These dynamic loads arise during transient interaction of the hollow billet, rollers, mandrel and other mill parts at the forced grip of the hollow billet. Basing of the calculation scheme and dynamic model of the mechanical system of the ТПА 350 automatic mill working stand was accomplished. A mathematical model of dynamics of the system “hollow billet (pipe) – working stand” within accepted calculation scheme and dynamic model of the mechanical system elaborated. Influence of technological load of the rolled hollow billet variation in time was accounted, as well as variation of the mechanical system mass, and rigidity of the ТПА 350 automatic mill working stand. Differential equations of oscillation movement for four-mass model of forked sub-systems of the automatic mill working stand were made up, results of their digital calculation quoted. Dynamic displacement of the stand elements in the inter-roller gap obtained, which enabled to estimate the results of amplitude and frequency characteristics of the branches of the mill rollers setting. It was defined by calculation, that the maximum amplitude of the forced oscillations of elements of the ТПА 350 automatic mill working stand within the inter-roller gap does not exceed 2 mm. It is much higher than the accepted value of adjusting parameters of the deformation center of the ТПА 350 automatic mill. A scheme of comprehensive modernization of the rollers setting in the ТПА 350 automatic mill working stand was proposed. It was shown, that increase of rigidity of rollers setting in the ТПА 350 automatic mill working stand enables to stabilize the amplitude of forced oscillations of the working stand elements within the inter-rollers gap and considerably decrease the induced nonuniform hollow billet wall thickness and increase quality of the rolled pipes at ТПА 350.

ANALISIS PENANGGULANGAN KELONGSORAN TANAH PADA RUAS JALAN GUNUNG TUGEL PATIKRAJA BANYUMAS

2017 ◽  
Vol 14 (1) ◽  
pp. 53
Author(s):  
Arwan Apriyono ◽  
Sumiyanto Sumiyanto ◽  
Nanang Gunawan Wariyatno
Keyword(s):  
Limit Equilibrium ◽  
Retaining Wall ◽  
Limit Equilibrium Method ◽  
Pile Foundations ◽  
Soil Parameters ◽  
The Road ◽  
Realistic Option ◽  
Stable Conditions ◽  
Using Data ◽  
Wall Slope

Gunung Tugel is an area that located Patikraja Region, Southern Banyumas. Thetopography of the area is mostly mountainous with a slope that varies from flat to steep. Thiscondition makes to many areas of this region potentially landslide. In 2015, a landslideoccurred in Jalan Gunung Tugel. The Landslide occurred along 70 meters on the half of theroad and causing traffic Patikraja-Purwokerto disturbed. To repair the damage of the road andavoid further landslides, necessary to analyze slope stability. This study is to analyze landslidereinforcement that occurred at Gunung Tugel and divides into 3 step. The first step is fieldinvestigation to determine the condition of the location and dimensions of landslides. Thesecond step is to know the soil parameters and analyzes data were obtained from the field. Andthe final step is analyzed of the landslide reinforcement by using data obtained from thepreceding step. In this research, will be applied three variations of reinforcement i.e. retainingwall, pile foundation and combine both of pile foundations and retaining wall. Slope stabilityanalysis was conducted using limit equilibrium method. Based on the analysis conducted onthe three variations reinforcement, combine both of pile foundations and retaining wall morerecommended. Application of and combine both of pile foundations and retaining wall is themost realistic option in consideration of ease of implementation at the field. From thecalculations have been done, in order to achieve stable conditions need retaining wall withdimensions of 2 meters high with 2,5 meters of width. DPT is supported by two piles of eachcross-section with 0.3 meters of diameter along 10 meters with 1-meter in space. Abstrak: Gunung Tugel adalah salah satu daerah yang terletak di Kecamatan PatikrajaKabupaten Banyumas bagian selatan. Kondisi topografi daerah tersebut sebagian besar berupapegunungan dengan kemiringan yang bervariasi dari landai sampai curam. Hal inimenyebabkan banyak daerah di wilayah Gunung Tugel yang berpotensi terjadi bencana tanahlongsor. Pada tahun 2015, peristiwa longsor kembali terjadi di ruas Jalan Gunung Tugel.Kelongsoran yang terjadi sepanjang 70 meter pada separuh badan jalan tersebut menyebabkanarus lalu lintas patikraja-purwokerto menjadi terganggu. Untuk memperbaiki kerusakan jalandan mencegah kelongsoran kembali, diperlukan analisis perkuatan tanah terhadap lerengtersebut. Studi analisis penanggulangan kelongsoran jalan yang terjadi di Gunung Tugel inidilakukan dengan tiga tahapan. Tahapan pertama adalah investigasi lapangan untukmengetahui kondisi lokasi dan dimensi longsor serta mengambil sampel tanah di lapangan.Tahap kedua adalah melakukan pengujian parameter tanah dan analisis data yang diperolehdari lapangan. Tahapan yang terakhir adalah analisis penanggulangan longsor denganmenggunakan data yang diperoleh dari tahapan sebelumnya. Pada penelitan ini, akanditerapkan tiga variasi perkuatan lereng yaitu dinding penahan tanah (DPT), turap dan DPTyang dikombinasikan dengan pondasi tiang. Analisis stabilitas lereng dilakukan dengan metodekeseimbangan batas. Berdasarkan hasil analisis yang dilakukan terhadap ketiga variasiperkuatan, DPT dengan kombinasi tiang pancang lebih direkomendasikan. Penerapan DPTyang dikombinasikan dengan minipile merupakan pilihan yang paling realistis denganpertimbangan tingkat kemudahan pelaksanaan di lapangan. Dari perhitungan yang telahdilakukan, untuk mencapai kondisi stabil diperlukan DPT dengan dimensi tinggi 2 meterdengan lebar bawah 2,5 meter. DPT tersebut ditopang oleh dua tiang tiap penampangmelintang dengan diameter 0,3 meter sepanjang 10 meter dengan jarak antar tiang 1 meter.kata kunci: tanah longsor, perkuatan tanah, metode keseimbangan batas

Influence of Ground Properties on Seismic Response of Tower Cranes Supported by Pile Foundations

2008 ◽  
Vol 1 (1) ◽  
pp. 37-46
Author(s):  
Satoshi TAMATE ◽  
Yasuo TOYOSAWA ◽  
Seiji TAKANASHI ◽  
Kazuya ITOH ◽  
Naoaki SUEMASA ◽  
...  
Keyword(s):  
Seismic Response ◽  
Pile Foundations
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