PERBANDINGAN HASIL UJI KAPASITAS DUKUNG TIANG PANCANG PADA TANAH LEMPUNG JENUH SKALA LABORATORIUM DENGAN PERHITUNGAN ANALISIS STATIS

Pile bearing capacity, is an important parameter in infrastructure design. The pile driving process, especially in saturated clay soils, results in an increase in pore pressure which affects the bearing strength capacity of the pile foundation immediately after erection. By knowing the com-parison of various ways to calculate the bearing capacity of a pile foundation, especially in clay soils, various influencing parameters can be studied and to be taken in determining the bearing ca-pacity of a pile foundation. The test is carried out by comparing the value of the pile bearing capacity of a laboratory scale pile model with the results of the calculation of the pile bearing capacity using the static analysis method based on the results of the test parameters of the soil. The clay soil con-ditions in the test are limited to saturated conditions. The reading of the change in pore water pres-sure is carried out using a pressure transducer during the pile driving process. Based on the pile loading test results in the laboratory, the pile bearing capacity results were 0.31 kN, while the bearing capacity results based on the static analysis method were 0.75 kN. The difference in pile bearing carrying capacity is caused by excess pore water pressure that appears around the ground during the driving process

Statistical Analysis of Dynamic Bearing Capacity of Driven Pile

This paper presents the use of statistical-probabilistic method in determining pile bearing capacities over a number of driven piles. Four dynamic formulas were employed to estimate pile bearing capacity including modified ENR, Hiley, Navy ??? McKay and Danish. We investigated the final setting data of 47 concrete piles with 600 mm diameter in the construction projects of New Naval Engineering Building Hasanuddin University. Based on the data, pile bearing capacity were computed and then analyzed statistically. Goodness of fit with Kolmogorov-Smirnov and Shapiro-Wilk were used to fit the probability distribution function (PDF) of the pile bearing capacity data to the PDF model. It was found that the pile bearing capacity estimated using ENR is more uniform with 506 tons average pile capacity and 6.4% COV, while that with Hiley and Danish are less various with 252 tons and 346 tons average pile capacity, and 14.7% and 16.6% COV respectively. Navy-McKay was found to have 465.8 tons average pile capacity with higher variability of 44.08%. A 90% Probability of pile bearing capacity estimated by ENR is 535 tons, or 1.17 times the upper bound, and 1.4 times the lower bound of pile capacity measured by pile driving analyzer (PDA). In comparison, 90% probability estimated by Danish is 420 tons or 0.93 times and 0.92 of the upper and lower bound of pile capacity measured by PDA, respectively. The Navy-McKay seeems to be overestimated whereas Hiley is underestimated

Theoretical and actual bearing capacity of driven piles using model piles in sand

In general, increasing of penetration rate may result in an increased of pile capacity. Occasionally, there were differences between theoretical and actual bearing capacity of the piles. Rate of penetration of pile influenced the pile bearing capacity. The bearing capacity of model pile increased as the rate of loading increased based on pile driving formula. Therefore, the study was conducted to determine the bearing capacity of model piles with different penetration forces based on theoretical method and experimented analysis. Five circular hollow section model piles using pipe pile were used to penetrate into cohesionless soil with different penetration force respectively. The loading for ultimate bearing capacity using theoretical calculation was approximately about 0.163kN. However, referring to the limitation of a laboratory setup, the maximum loading was 0.12kN. Several trials had been initiated but when it reached 0.14kN, the setup was unstable and dangerous to be continued. Therefore, the ultimate bearing capacity derived by the pile load test results were based on a pile moved up to 10% of its tip diameter criteria. In the future, both theoretical and actual calculation must be made to avoid any confusion and detect mistakes in near futur

Experimental investigation of bearing mechanism of closed- and open-ended piles supported by thin bearing layer using X-ray micro CT

In order to clarify the bearing mechanism of closed-ended and open-ended piles supported by a thin bearing layer, pile-loading tests are conducted on model grounds with different bearing layer thicknesses, and the soil deformation characteristics around the pile tips are observed by X-ray micro CT. In the case of open-ended piles supported by a thin bearing layer, the soil in the pile greatly displaces following the downward displacement of the soil located more deeply than the pile tip, and the soil density in the pile becomes lower than when the bearing layer thickness is sufficiently large. These characteristics probably cause lower inner friction and lower base resistance, resulting in a lower bearing capacity. When the bearing layer thickness is more than three times the pile diameter, the bearing capacity is much higher than when the bearing layer thickness is the same as the pile diameter. In addition, soil deformation which occurs is almost entirely in the bearing layer, and the changes in bearing capacity are hardly affected by the soft layer below the bearing layer. The experimental findings obtained in the present study support the idea that the criterion for the bearing layer thickness, where the influence of a thin bearing layer on the bearing capacity can be ignored, is three times the pile diameter, regardless of whether the pile tip is open or closed

Bearing Capacity of Pile Foundations Embedded in Clays and Sands Layer Predicted Using PDA Test and Static Load Test

Static Load Test (SLT) is the realiable method to determine bearing capacity of pile foundations. However, SLT is relatively expensive and time consuming compared to Pile Driving Analyzer (PDA) test. Therefore PDA test becoming more populer as an alternative to predict bearing capacity of piles. This paper presents the comparation of ultimate bearing capacity of pile foundations interpreted from Static Load Test (SLT) results and that predicted from PDA tests. Davisson and Chin methods were used to determine bearing capacity of pile foundations interpreted from SLT results. Correlation between bearing capacity of piles embedded in sand and clay layer interpreted from SLT and PDA test was analyzed. The result shows that bearing capacity of piles which determined based on Static Load Test interpreted using Davisson and Chin methods exhibit relatively better agreement with the predetermined ultimate bearing capacity. Almost all records of bearing capacity of pile foundation embedded in sands layer interpreted from SLT are larger than those predicted using PDA test. While bearing capacity of piles embedded in clays predicted using PDA test varies in relatively large margin compared to that determined from SLT

KAPASITAS DAYA DUKUNG TIANG PANCANG JEMBATAN AIR MANGGALA PRABUMULIH DENGAN METODE MAYERHOF DAN METODE ENR

Pile foundation structures in a building are generally used if the subgrade under the building does not have sufficient bearing capacity to bear the weight of the building. The data needed to analyze the bearing capacity of these piles was from the measurement results in the field in the form of SPT and calendering data. In this paper,  calculated the bearing capacity of the pile analytically from the results of calendering and standart penetration test (SPT), calculated using the Mayerhoff and ENR method. And the results of the SPT calculation showed that the net weight value or N (the amount of load received by each pile) imposed on the pile was 132.04 tons, from the calculation of the pile bearing capacity ≤ 200 tons and qualified for the safety requirements of the foundation to the soil bearing capacity. From the results of the ENR method, the largest pile bearing capacity was 305.16 tons with a value of S (the number of pile penetrations of 10 blows) was 0.002 m

Analisis Kekuatan Daya Dukung Pondasi Helical Menggunakan Data Sondir pada Tanah Gambut

Bearing capacity of Helical Pile on peat soil can be obtained from cone penetration test (CPT). Bearing capacity based on CPT data is calculated by Bustamante & Gianeselli (LCPC) method, Schmertmann method, method Meyerhoff, Price & Wardle method, and Tumay & Fakhroo method. Meanwhile, there are two methods based on peat soil mechanisms to determine the bearing capacity of the helical pile such a cylindrical shear method and individual bearing method. This research evaluates bearing capacity of the five methods above by implementing two basic methods helical pile on peat soil that most closely to the actual bearing capacity. The results showed that the method Bustamante & Gianeselli (LCPC) to provide bearing capacity that most closely to the actual bearing capacity compared to other methods. Reduction factor is also necessary to modify bearing capacity the foundation Helical. After reduced, bearing capacity of each method has decreased significantly and tends to approach the actual bearing capacity

Perbandingan Kapasitas Dukung Aksial Pondasi Tiang Tunggal dengan Beberapa Metode Analisis (Studi Kasus : Pondasi Rumah Sakit Pendidikan Universitas Riau Pekanbaru)

A pile foundation design should be done carefully and as carefully as possible. Each foundation must be able to support loads up to the limit safely, including supporting the maximum load that may occur. The purpose of this study was to determine the bearing capacity and settlement of pile foundation at Rumah Sakit Pendidikan Universitas Riau Pekanbaru Project. Analyses were performed by static and dynamic methods to determine the bearing capacity of piles and settlement. Bearing capacity of piles with static methods is calculated based on the data field (SPT) and laboratory while the method of dynamically calculated based on the field data is data obtained static load test and Pile Driving Analyzer (PDA) while driving operation. In this paper, we describe briefly how the calculate bearing capacity of the pile vertical for some methods such as Meyerhof, Poulus dan Davis, U.S Army Corps, Briaud et al. (1985), Metode β, Software All Pile and From the analysis data , ultimate bearing capacity vertical for single pile base on SPT and laboratory methods Briaud et al. (1985) is near ultimate bearing capacity for single pile base on static load tes