Fig. 2.9: Cyclic mobility of dilative sand under simple shear loading (after Sivathayal; 1994). 19 o o_ V) W 9 • 4 -J C (/) Cyclic Loading (Last Cycle) Post Cyclic Monotonic Loading Shear Strain 7, % 25 0 25 50 t 75 100 Normal Stress cr», kPa Fig . 2.10: Post-liquefaction monotonic response to simple shear loading (after Sivathayalan, 1994
Undrained monotonic and undrained cyclic direct simple shear (DSS) tests were performed on normally consolidated, slurry deposited specimens. Calibration of the PM4Silt model was based on the monotonic and cyclic DSS test data, plus empirical relationships for strain-dependent secant shear moduli and equivalent damping ratios. Technical definitions. Soil liquefaction occurs when the effective stress (shear strength) of soil is reduced to essentially zero.This may be initiated by either monotonic loading (i.e. a single, sudden occurrence of a change in stress – examples include an increase in load on an embankment or sudden loss of toe support) or cyclic loading (i.e. repeated changes in stress condition In other words, cyclic liquefaction occurs when in situ static shear stresses are small compared to intermittent shear stresses. Cyclic liquefaction requires undrained cyclic loadings so that it occurs in zero effective stress conditions. During the cyclic liquefaction, effective stress at point zero, there is no shear stress. Fig. 2.9: Cyclic mobility of dilative sand under simple shear loading (after Sivathayal; 1994). 19 o o_ V) W 9 • 4 -J C (/) Cyclic Loading (Last Cycle) Post Cyclic Monotonic Loading Shear Strain 7, % 25 0 25 50 t 75 100 Normal Stress cr», kPa Fig . 2.10: Post-liquefaction monotonic response to simple shear loading (after Sivathayalan, 1994 Recent findings related to the application of the seismic cone penetration test (SCPT) for the evaluation of liquefaction potential under cyclic loading are presented and discussed. The SCPT provides independent measurements of penetration resistance, pore pressures, and shear-wave velocity in a fast, continuous, and economic manner. However, the cyclic simple shear test, which could convincingly represent the real seismic ground shaking under repeated horizontal shear force, has not been conducted yet. Therefore, this paper aims to characterize the behaviors of Chiang Mai sand under monotonic and cyclic loadings using a direct simple shear apparatus.
However, the cyclic simple shear test, which could convincingly represent the real seismic ground shaking under repeated horizontal shear force, has not been conducted yet. Therefore, this paper aims to characterize the behaviors of Chiang Mai sand under monotonic and cyclic loadings using a direct simple shear apparatus. The results of this study are then extended to other magnitude earthquakes using a combination of laboratory and field data. Available information on the liquefaction resistance of silty sands is also reviewed and a simple procedure for considering the influence of silt content is proposed. Experimental investigations on volumetric strain behavior of saturated sands under bi-directional cyclic loadings: ZHAO Kai, WU Qi, XIONG Hao, MAO Wen-bo, CHEN Guo-xing: Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China A strain-based procedure to estimate strength softening in saturated clays during earthquakes Chi-Chin Tsaia,n, Lelio H. Mejiab, Philip Meymandb a Department of Civil Engineering, National Chung Hsing University, Taiwan b URS Corporation, 1333 Broadway, Suite 800, Oakland, CA 94612, USA article info Article history: Received 23 September 2013 Behaviour of Cohesionless Soils During Cyclic Loading Amir Shajarati1 Kris Wessel S˝rensen1 S˝ren Kjˆr Nielsen1 Lars Bo Ibsen2 Department of Civil Engineering, Aalborg University Abstract O shore wind turbine foundations are typically subjected to cyclic loading from both wind and waves, Abstract. Delhi, the capital of India, has experienced mild seismic shaking during several earthquakes in the past. The large variations of depth to bedrock and ground water table coupled with different soil types at different locations of Delhi necessitate a seismic microzonation study.
Fundamentals of Liquefaction under Cyclic Loading. The mechanism of progressive pore pressure increase during undrained cyclic simple shear tests on PDF | The results of a study of liquefaction induced by cyclic loading are presented. Liquefaction General trends are recorded for variation of steady state lines in rain size distribution and in grain angularity. Download full-text PDF Liquefaction and Liquefaction Mitigation for foundation Safety -State of the Art Chapter 1. The mechanism of progressive pore pressure increase during undrained cyclic simple shear tests on saturated sands has been examined in detail. SOILS AND FOUNDATIONS LIQUEFACTION PROCESS OF SAND DURING CYCLIC LOADING Download PDF (1913K) on saturated sand to investigate the process of liquefaction under the condition of constant mean principal stress. Download PDFDownload Undrained cyclic loading tests were performed under torsional shear in a hollow cylindrical The excess pore water pressure required to induce liquefaction was found to Download : Download full-size image of the curves appears to indicate the fundamental response of granular materials. registered trademarks of GEO-SLOPE International Ltd. in Canada and other Cyclic loading can also lead to liquefaction as is illustrated in Figure 1-6. three fundamental components: the ground profile, the soil behavior and modeling. Kit (SDK) available on the website (www.geo-slope.com/downloads) for full details. 23 Jan 2019 In strain-based procedure, the liquefaction potential is determined by the level of excess pore during undrained cyclic loading than shear stress (Hazirbaba & Omarow, 2015, 2018). The desired layer height was achieved by using a manual tamper. Soil Mechanics and Foundations Division, ASCE, 97.
SOILS AND FOUNDATIONS LIQUEFACTION PROCESS OF SAND DURING CYCLIC LOADING Download PDF (1913K) on saturated sand to investigate the process of liquefaction under the condition of constant mean principal stress. Download PDFDownload Undrained cyclic loading tests were performed under torsional shear in a hollow cylindrical The excess pore water pressure required to induce liquefaction was found to Download : Download full-size image of the curves appears to indicate the fundamental response of granular materials. registered trademarks of GEO-SLOPE International Ltd. in Canada and other Cyclic loading can also lead to liquefaction as is illustrated in Figure 1-6. three fundamental components: the ground profile, the soil behavior and modeling. Kit (SDK) available on the website (www.geo-slope.com/downloads) for full details. 23 Jan 2019 In strain-based procedure, the liquefaction potential is determined by the level of excess pore during undrained cyclic loading than shear stress (Hazirbaba & Omarow, 2015, 2018). The desired layer height was achieved by using a manual tamper. Soil Mechanics and Foundations Division, ASCE, 97. 17 Aug 2014 This paper presents the results of a series of cyclic triaxial tests carried out on sands Download to read the full article text Bobet, A.; Salgado, R.; Loukidis, D.: Seismic Design of Deep Foundations. Seed, H.B.; Lee, K.L.: Studies of liquefaction of sands under cyclic loading conditions. Download PDF. 20 Jul 2019 Download PDF 606 Downloads Cyclic loading history may change the stress–strain behaviour of a soil to an extent The soil-foundation interactions under cyclic lateral loading have been Wang, G., Wei, J.: Microstructure evolution of granular soils in cyclic mobility and post-liquefaction process.
17 Aug 2014 This paper presents the results of a series of cyclic triaxial tests carried out on sands Download to read the full article text Bobet, A.; Salgado, R.; Loukidis, D.: Seismic Design of Deep Foundations. Seed, H.B.; Lee, K.L.: Studies of liquefaction of sands under cyclic loading conditions. Download PDF.
Int. J. Pres. Ves. & Piping 47 (1991) 207-215 A New Method of Base Isolation against Earthquake Damage using Natural Material Shengwei Tang, Gert KSnig & Otto Kroggel Institut fiir Massivbau, Technical University, Darmstadt, FRG (Received 10 July 1990; accepted 17 November 1990) ABSTRACT In this paper, the idea, construction and experiment study of a new isolation method using soil
