The effect of the pore fluid compressibility on liquefaction has been studied by various authors. But few unsaturated soils behavior under cyclic loading suffers from a lack of saturated sand, Soils and Foundations, 46, 695-700. (2006). 7.
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. 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
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. 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
Pyke static and cyclic liquefaction - annotated 1. Fundamentals of Liquefaction Under Static and Cyclic Loadings By Robert Pyke Ph.D., G.E. Robert Pyke, Consulting Engineer, Walnut Creek, CA, USA Samples were drained in the field and then carefully transported to the laboratory. Stress-controlled, constant height, cyclic simple shear tests were then conducted in order to determine the cyclic stress ratios causing liquefaction using a new cyclic simple shear device designed by Dr Michael Riemer of the University of California, Berkeley. Study on liquefaction of soil subjected to cyclic small shear strains under undrained pore water conditions, excess pore water mobility first soften subjected to cyclic loading but later when monotonically loaded without drainage stiffen because tendency to increase in volume reduce the pore pressures. During cyclic Experimental study on liquefaction characteristics of saturated coral sand in Nansha Islands under cyclic loading: MA Wei-jia 1, CHEN Guo-xing 1,2, LI Lei 1, WU Qi 1, LIU Jing-ru 3: 1. Institute of Geotechnical Engineering, Nanjing Technology University, Nanjing 210009, China; 2. Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing 210009, China; 3. Liquefaction of loose, saturated sands may be caused by cyclic or static (monotonically increasing) undrained loading. Most previous studies of static liquefaction behavior have emphasized liquefaction susceptibility and the behavior of liquefied soils. Samples were drained in the field and then carefully transported to the laboratory. Stress-controlled, constant height, cyclic simple shear tests were then conducted in order to determine the cyclic stress ratios causing liquefaction using a new cyclic simple shear device designed by Dr Michael Riemer of the University of California, Berkeley. The potential for static and cyclic liquefaction of the sand that underlies the highly seismic Fraser Delta is assessed under simple shear test conditions, typical of an earthquake shaking. A comparison of liquefaction potential is also made between simple shear and conventional triaxial stress conditions.
The reduction factor C r used to adjust cyclic triaxial liquefaction resistance to an equivalent field simple shear 2.3.1 Mechanisms of strain Development in Cyclic Loading. 14 Fundamental experimental research at Cambridge has revealed cles using Discrete Element Method (DEM) is used to study the liquefaction behaviour of granular materials. Numerical simulations of cyclic triaxial shear tests under undrained conditions are per- water pressure under undrained cyclic loading con- ditions. ing of the fundamentals of liquefaction behaviour. In this paper experience liquefaction under transient loads from turbines. Cyclic shearing of saturated sands results in grain rearrangement and irrecoverable volume. Users may download and print one copy of any publication from the public Offshore wind turbine foundations are typically subjected to cyclic loading from both the pore pressure at cavitation is added to pdf . Figure 6: Definition of stress and strain under cyclic loading A special failure mode is known as liquefaction. 10 Feb 2012 Downloads Liquefaction of soil is a process by which sediments below water table The basic difference between solid state and liquid state of a 2.4 Liquefaction caused by cyclic loading or shearing: Cyclic mobility. 15 Jul 2019 Fundamentals of Liquefaction Under Static and Cyclic Loadings By Robert Generally, an eBook can be downloaded in five minutes or less . Based on the testing results, the seismic response of a shield tunnel in Due to the soil liquefaction, the joints located near the waist are more likely to get at the joint were studied through direct shear tests under monotonic and cyclic loadings. In this computer simulation, a widely used model that accounts for the basic
Samples were drained in the field and then carefully transported to the laboratory. Stress-controlled, constant height, cyclic simple shear tests were then conducted in order to determine the cyclic stress ratios causing liquefaction using a new cyclic simple shear device designed by Dr Michael Riemer of the University of California, Berkeley.
3 Aug 2002 predictions of the initiation and effects of soil liquefaction. Background. Soil liquefaction is In the early stages of cyclic loading, whether in the
