DFI Journal - The Journal of the Deep Foundations Institute最新文献_第10页

Lateral Earth Pressure on Lagging in Soldier Pile Wall Systems 士兵桩墙体系滞后的侧土压力

DFI Journal - The Journal of the Deep Foundations Institute Pub Date : 2008-11-01 DOI: 10.1179/dfi.2008.006

H. Perko, John J Boulden

{"title":"Lateral Earth Pressure on Lagging in Soldier Pile Wall Systems","authors":"H. Perko, John J Boulden","doi":"10.1179/dfi.2008.006","DOIUrl":"https://doi.org/10.1179/dfi.2008.006","url":null,"abstract":"Abstract Soldier pile and lagging is a conventional means of temporary excavation shoring. Timber lagging design has traditionally been based upon the designer’s experience or empirical rules. One such method is the Goldberg Zoino chart used by the Federal Highway Administration. Most of these methods restrict the designer to a consistent soil profile, certain pile spacing, construction grade timber lagging, and limited depth. The methods do not take into account surcharge loads or a variety of other factors that could arise. A designer working outside of ordinary circumstances with unusual loads, varying soil conditions, or alternate lagging materials has difficulty estimating lateral earth pressures. In rigid earth retention systems, lateral earth pressure is generally assumed to be constant along the length of the wall. In soldier pile and lagging systems, the lagging is often considerably less stiff than the steel soldier piles. As the lagging deflects, the soil tends to bridge between the stiffer elements resulting in a lower pressure on the lagging. Several previously published methods by others for determining this reduced pressure are summarized and discussed. These methods typically consist of using a portion of the active earth pressure in several different pressure distributions. A simple theoretical model is presented for determination of lateral earth pressures on wood lagging. The model is based on a three-dimensional “silo” shaped sliding wedge analysis. Results of the model are compared with other published methods. The model compares well with these methods which cover the normal spectrum of design situations. In addition, the model can be used to estimate lateral earth pressures outside typical situations.","PeriodicalId":272645,"journal":{"name":"DFI Journal - The Journal of the Deep Foundations Institute","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116351086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Construction of Large Drilled Shafts (The 2nd Annual Mike O’Neill Lecture) 大型钻井井的施工(第二届年度Mike O 'Neill讲座)

DFI Journal - The Journal of the Deep Foundations Institute Pub Date : 2008-11-01 DOI: 10.1179/dfi.2008.001

Dan A. Brown

引用次数: 1

Effects of Helical Anchor Geometry on Long-Term Performance of Small Wind Tower Foundations Subject to Dynamic Loads 螺旋锚杆几何形状对动荷载作用下小型风塔基础长期性能的影响

DFI Journal - The Journal of the Deep Foundations Institute Pub Date : 2008-11-01 DOI: 10.1179/dfi.2008.004

A. Cerato, Rory Victor

{"title":"Effects of Helical Anchor Geometry on Long-Term Performance of Small Wind Tower Foundations Subject to Dynamic Loads","authors":"A. Cerato, Rory Victor","doi":"10.1179/dfi.2008.004","DOIUrl":"https://doi.org/10.1179/dfi.2008.004","url":null,"abstract":"Abstract The application of this study is to use helical anchors as a foundation system for small wind tower (1 – 10 kW) guyed cables. Helical anchors are currently used to anchor guyed cables of telecommunication and electric towers. However, the increased dynamic vibrations a wind turbine adds to the tower and foundation system under working loads, as well as extreme environmental conditions (e.g., straight line winds, ice load or sudden furling shocks), require additional knowledge about the behavior of helical anchors. These field conditions were simulated in this study by instrumenting a working tower with load cells and 3-axis accelerometers to gather data on wind speed and tower response. These tower responses were then transmitted to the helical anchors through an extensive, large-scale testing program that included monitoring the performance of the helical anchor foundation under dynamic loads, subject to natural variations in both wind regimes, precipitation (water level) and variations in helical anchor geometry. This paper specifically discusses the effects of helical anchor geometry on helical anchor performance under long-term dynamic loads.","PeriodicalId":272645,"journal":{"name":"DFI Journal - The Journal of the Deep Foundations Institute","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132674996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Increase in Shear Modulus by Soil Mix and Jet Grout Methods 土混合料和喷射注浆法提高剪切模量

DFI Journal - The Journal of the Deep Foundations Institute Pub Date : 2008-11-01 DOI: 10.1179/dfi.2008.002

P. Axtell, T. Stark

引用次数: 16

Ultimate Soil Pressures for Pile Groups in Soft Clay Subjected to Lateral Soil Movements 受侧向土移作用的软粘土桩群极限土压力

DFI Journal - The Journal of the Deep Foundations Institute Pub Date : 2008-11-01 DOI: 10.1179/dfi.2008.005

L. Miao, A. Goh, K. S. Wong, C. Teh

{"title":"Ultimate Soil Pressures for Pile Groups in Soft Clay Subjected to Lateral Soil Movements","authors":"L. Miao, A. Goh, K. S. Wong, C. Teh","doi":"10.1179/dfi.2008.005","DOIUrl":"https://doi.org/10.1179/dfi.2008.005","url":null,"abstract":"Abstract Studies were carried out to investigate the ultimate soil pressure acting on pile(s) undergoing lateral soil movement in soft clay. A special apparatus has been designed to apply a uniform rectangular profile of lateral soil movement on the rigid pile(s) with pinned head and tip conditions to obtain the ultimate soil pressure. The piles were 16 mm (5/8 in) in diameter. For the pile group tests, the behavior of different number of piles (2, 3, 4, 6 and 9), pile arrangements and center-to-center spacings (3 and 6 diameters) were investigated. In this paper, the group factors of 11 combinations of number of piles, pile arrangements and pile spacings are presented. The group factors are given for individual piles in a pile group as well as for the entire group. Generally, the group factors of individual piles in a group varied significantly according to pile spacing in both directions, and pile arrangement; the group factor of the whole group reduced with an increasing number of piles, and increased with increasing pile spacing. For a pile group with the same number of piles but different pile arrangement, no significant difference was found in the group factors for the entire group.","PeriodicalId":272645,"journal":{"name":"DFI Journal - The Journal of the Deep Foundations Institute","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117009533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Rapid Lateral Load Testing of Deep Foundations 深地基快速横向荷载试验

DFI Journal - The Journal of the Deep Foundations Institute Pub Date : 2007-11-01 DOI: 10.1179/dfi.2007.005

Dan A. Brown

引用次数: 5

Ground Movements – A Hidden Source of Loading on Deep Foundations 地面运动-深地基上隐藏的荷载来源

DFI Journal - The Journal of the Deep Foundations Institute Pub Date : 2007-11-01 DOI: 10.1179/dfi.2007.004

H. Poulos

引用次数: 31

Design And Construction of the Sutong Bridge Foundations 苏通大桥基础设计与施工

DFI Journal - The Journal of the Deep Foundations Institute Pub Date : 2007-11-01 DOI: 10.1179/dfi.2007.001

R. Bittner, O. Safaqah, Xigang Zhang, O. J. Jensen

引用次数: 20

Deep Diaphragm Wall Activities at RandstadRail Project in Rotterdam, The Netherlands 荷兰鹿特丹RandstadRail项目的深连续墙活动

DFI Journal - The Journal of the Deep Foundations Institute Pub Date : 2007-11-01 DOI: 10.1179/dfi.2007.002

Klaus Pöllath, F. Haehnig, Jan T. Glückert

引用次数: 2

Design of Drilled Shafts Supporting Sound Walls 支撑隔声墙的钻孔井设计

DFI Journal - The Journal of the Deep Foundations Institute Pub Date : 2007-11-01 DOI: 10.1179/dfi.2007.003

Ke Yang, R. Liang, J. Nusairat, N. Abu-Hejleh

{"title":"Design of Drilled Shafts Supporting Sound Walls","authors":"Ke Yang, R. Liang, J. Nusairat, N. Abu-Hejleh","doi":"10.1179/dfi.2007.003","DOIUrl":"https://doi.org/10.1179/dfi.2007.003","url":null,"abstract":"Abstract Drilled shafts are widely adopted as the foundation for sound walls. However, there has been a lack of uniformity in design and analysis methods and design criteria, in terms of factor of safety against ultimate capacity failure as well as the allowable deflection. In order to establish a uniform design methodology for the drilled shafts supporting sound walls in cohesive and cohesionless soils, respectively, a database of fullscale lateral load tests on fully instrumented drilled shafts was collected. Based on the compiled database, existing design methods and design criteria of laterally loaded drilled shafts were evaluated. Broms method and COM624P (or LPILE) are suggested as the design methods for drilled shafts supporting sound walls in both cohesive and cohesionless soils. Additionally, the corresponding design criteria, including factor of safety and permissible deflection, for both design methods are recommended. Two full-scale lateral load tests on fully instrumented drilled shafts were subsequently conducted in Colorado to further verify the design recommendation. A comprehensive geotechnical investigation program was also carried out at the two new lateral load test sites that included pressuremeter test, SPT, as well as laboratory triaxial consolidated undrained tests and direct shear tests on the soil samples taken from the lateral load test sites. The test results obtained at these two load test sites were employed to validate the recommended geotechnical design and geotechnical testing methods for the drilled shafts supporting sound walls.","PeriodicalId":272645,"journal":{"name":"DFI Journal - The Journal of the Deep Foundations Institute","volume":"36 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132973240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0