Test Research on the Long-Term Consolidation Mechanism of Ultra-Soft Clay

2013 ◽  
Vol 671-674 ◽  
pp. 146-150
Author(s):  
Ai Min Liu ◽  
Shu Wang Yan ◽  
Jing Shuang Li
Keyword(s):  
Construction Projects ◽  
Land Reclamation ◽  
Soft Clay ◽  
Initial Water Content ◽  
Strength Increase ◽  
Vacuum Preloading ◽  
Initial Water ◽  
Design Requirements ◽  
Test Result

Although the settlement of ultra-soft clay improved by the vacuum preloading technique was large in land reclamation projects, usually exceeding the theoretical calculation value by a large amount, the strength increase was relatively small. As a result the foundation would not meet the design requirements for strength. So a test was conducted to investigate the effect and mechanism of long-term consolidation of ultra-soft clay in laboratory in a period of over 691 days. A preloading load of 80kPa was used in this drainage consolidation test. The test result showed that for the ultra-soft clay with a high initial water content but a small strength, the settlement is large with a large strength increase, but the shear strength was relatively low. These results should draw much attention in application of vacuum preloading technique in construction projects.

scholarly journals Preloading Model on Soft Soil with Inclusion Thermal Induction Vertical and Incline Types

2021 ◽  
Vol 7 (6) ◽  
pp. 998-1007
Author(s):  
Maraden Panjaitan ◽  
A. R. Djamaluddin ◽  
Tri Harianto ◽  
A. B. Muhiddin
Keyword(s):  
Water Content ◽  
Soft Soil ◽  
Soft Clay ◽  
Test Tube ◽  
Observation Point ◽  
Initial Water Content ◽  
Initial Water ◽  
Temperature Variations ◽  
Main Observation ◽  
Thermal Induction

Soft clay has a relatively low subgrade bearing capacity. The aim is to obtain physical values, mineralogy, mechanical strength values, values for reduction. The research method used is preloading in a test tube measuring 50×70×150 cm. Each cycle of preloading and thermal induction used a fixed load of 0.015 kg/cm². Thermal induction is given vertically and obliquely with temperature variations of 100, 200, 300, and 400 °C. The main observation point is a distance of 15 cm from the center of the induction. At 400 °C inclined induction, the water content is 17.36% (from the initial water content of 59.07%), the soil cohesion is 21.75. kN/m², the value of unconfined compressive strength is 67.72 kN/m², the highest modulus of elasticity is 4593 kN/m2, and the decrease is 5.13 cm. XRD, SEM, EDS results before heating showed mineralogy 0 (65.06%), Ca (13.30%), Na (3.64%), Mg (2.15%), Al (6.63%), Si (8.52%), Sn (0.70%) and did not change significantly after heating at 400 °C. The results after heating included 0 (58.39%), Ca (14.09%), Na (0.72%), Mg (1.16%), Al (6.63%), Si (14.72%), Sn (2.54%). The novelty obtained is to change very soft conditions became medium conditions. Doi: 10.28991/cej-2021-03091705 Full Text: PDF

scholarly journals Hygrothermal Aging of Amine Epoxy: Reversible Static and Fatigue Properties

2018 ◽  
Vol 8 (1) ◽  
pp. 447-454 ◽  
Author(s):  
Andrey E. Krauklis ◽  
Abedin I. Gagani ◽  
Andreas T. Echtermeyer
Keyword(s):  
Fiber Reinforced Polymers ◽  
Fatigue Properties ◽  
Initial Water Content ◽  
Initial Water ◽  
Reinforced Polymers ◽  
Structural Applications ◽  
High Concern ◽  
Static Tensile ◽  
Aging Mechanisms

Abstract Fiber-reinforced polymers (FRP) are widely used in structural applications. Long-term properties of such materials exposed to water are of high concern and interest, especially for subsea and offshore applications. The objective of this study is to identify the mechanisms and to identify whether drop in properties of diamine-cured mixed DGEBA-HDDGE is reversible upon drying the material to its initial water content. The properties of interest are mechanical strength, elastic properties and fatigue performance, as well as changes in chemical structure. The effect of absorbed water on the properties of the resin is evaluated, and hygrothermal effects and aging mechanisms are discussed. Furthermore, it is shown experimentally that the tension fatigue S-N curve of a wet epoxy resin can be estimated by shifting the S-N curve of a dry material proportionally to a reduction in static tensile strength due to hygrothermal effects.

Experimental Research on Coupling of Swelling Rock between Swelling and Creep

2013 ◽  
Vol 353-356 ◽  
pp. 293-302
Author(s):  
Qiu Yan Fan ◽  
Mei Qian Wang ◽  
Xian Li ◽  
Bo Zhang
Keyword(s):  
Creep Deformation ◽  
Residual Deformation ◽  
Swelling Pressure ◽  
Initial Water Content ◽  
Term Strength ◽  
Compression Tests ◽  
Initial Water ◽  
Multi Stage ◽  
Swelling Rock

Swelling rock has the properties of swelling and creep. Researches on coupling between swelling and creep have not yet been carried out. The expansive Paleogene mudstone is used to laboratory uniaxial compression tests, to find the coupling regularity between swelling and creep under different initial water contents, influent modes and loading methods. For coupling, the creep curves show similar characteristic of non-coupling. The creep deformation increases obviously and the long-term strength decreases comparing with non-coupling. With increasing initial water content, the creep deformation increases for coupling. The creep deformation increases with the enlargement of water-absorption area during the coupling creep. For single-stage and multi-stage loading, the creep regularity is similar to non-coupling. The sample will have a permanent residual deformation when unloaded at the second stable creep stage. The long-term strength of swelling rock is greater than the swelling pressure and the long-term strength is lower than that of non-coupling.

Permeation Tests on Tianluoshan Relic Soils with Methyl Acrylic Acid Resin

2013 ◽  
Vol 726-731 ◽  
pp. 3706-3709 ◽  
Author(s):  
Pei Hang Chen ◽  
Xin Jun Chai ◽  
Jin He Gao ◽  
Yu Jiao Wang
Keyword(s):  
Acrylic Acid ◽  
Water Content ◽  
Influence Factors ◽  
Degree Of Saturation ◽  
Dry Density ◽  
Initial Water Content ◽  
Initial Water ◽  
Acid Resin ◽  
Long Term Preservation

Tianluoshan relic sites is a typical earthen sites located at moisture circumstances, where craking, chalking, flaking and mould are the main geological diseases after excavation. For public exhibition and long-term preservation purpose, chemical stabilization were required. In this study, the potential application of methyl acrylic acid resin for solidification of Tianluoshan relic soils were evaluated by a series of laboratory permeation tests. The main considered influence factors include: dry density, initial water content and degree of saturation. The results show that the permeation effect of methyl acrylic acid resin were greatly related with dry density and initial water content of the earthen soils, the practical application guidance are also presented.

scholarly journals study on sedimentation characteristics of soft clay

2021 ◽  
Vol 236 ◽  
pp. 02039
Author(s):  
Wang Xuekui ◽  
Wang Qingqing
Keyword(s):  
Water Content ◽  
Soil Property ◽  
Raw Materials ◽  
Soft Clay ◽  
Initial Water Content ◽  
Initial Water ◽  
Hydraulic Fill ◽  
Two Stages ◽  
Short Time ◽  
Property Index

There are large areas of soft clay distributed in coastal areas of China, which are often used as raw materials for hydraulic fill engineering in recent years, and its sedimentation characteristics have attracted more and more attention. In this paper, the influence of initial water content on the sedimentation characteristics of soft clay is studied through the experiment. The results show that: (1) the sedimentation process of soft clay can be divided into two stages: sedimentation stage and self weight consolidation stage. The sedimentation stage has a short time, and the soil property index tends to be stable quickly; the self weight consolidation stage is very slow, and the soil property index almost has no change; (2) the larger the initial water content of soft clay, the greater the sedimentation rate and the faster the sedimentation; (3) the higher the initial water content, the faster the sedimentation, the higher the water content and the void ratio, the smaller the density.

Influence of initial water content and strain rate on remolded yield stress in marine clay

2021 ◽  
pp. 1-8
Author(s):  
Xiaobing Li ◽  
Jianpeng Chen ◽  
Xiuqing Hu ◽  
Hongtao Fu ◽  
Jun Wang ◽  
...  
Keyword(s):  
Strain Rate ◽  
Water Content ◽  
Yield Stress ◽  
Initial Water Content ◽  
Marine Clay ◽  
Initial Water

scholarly journals Application of the Calorimetric Methods to the Characteristics of Seeds from Olives

Proceedings ◽  
2020 ◽  
Vol 70 (1) ◽  
pp. 90
Author(s):  
Andrzej Bryś ◽  
Joanna Bryś ◽  
Marko Obranović ◽  
Dubravka Škevin ◽  
Szymon Głowacki ◽  
...  
Keyword(s):  
Olive Oil ◽  
Water Content ◽  
Cooling System ◽  
Waste Product ◽  
Normal Pressure ◽  
Ash Content ◽  
Initial Water Content ◽  
Scanning Calorimetry ◽  
Initial Water

The olive oil industry represents an important productive sector in the Mediterranean basin countries. Olive stone is an essential by-product generated in the olive oil extraction industries and it represents roughly 10% by weight of the olive fruit. The seeds of pickled olives are also a significant waste product. In the present study, we have investigated the possibility of the use of differential scanning calorimetry for the thermal characterization of seeds from green and black pickled olives from Croatia. The differential scanning calorimeter (DSC) with a normal pressure cell equipped with a cooling system was used to determine the thermal properties of seeds from olives. The following analyses were also performed: the determination of calorific values in a pressure bomb calorimeter, the determination of initial water content, the determination of changes of water content during drying at the temperatures of 30 °C, 50 °C and 80 °C, the determination of a percentage content of seeds mass to the mass of the whole olives, and the determination of ash content. Seeds from olives are characterized by very good parameters as a biomass. The analyzed olive seeds were characterized by low water content, low ash content, and a relatively high caloric value.

scholarly journals RESEARCH ON MODEL FITTING AND STRENGTH CHARACTERISTICS OF CRITICAL STATE FOR EXPANSIVE SOIL

2013 ◽  
Vol 19 (1) ◽  
pp. 9-15 ◽  
Author(s):  
Zhiqing Li ◽  
Chuan Tang ◽  
Ruilin Hu ◽  
Yingxin Zhou
Keyword(s):  
Critical State ◽  
Model Fitting ◽  
Expansive Soil ◽  
Dry Density ◽  
Initial Water Content ◽  
Test Results ◽  
Stress Strain ◽  
Initial Water ◽  
Curve Model ◽  
Shearing Strength

According to Mengzi expansive soil, consolidated drained tests and undrained tests are carried on under saturated and remoulded conditions. The stress-strain characteristics of saturated soil are researched systematically under different confining pressure, initial dry density, initial water content, shearing rate and drainage condition. The inherent unity of diversity of shearing strength for the same samples measured by different experimental methods is indicated according to the normalization of critical state test results. And the failure lines in p ‘- q - ν space of remoulded saturated expansive soil under consolidated drained and undrained conditions are attained. The hyperbolic curve model can fit well the weak hardening stress-strain curves and the exponential curve model can fit the weak softening stress-strain curves. The test results can provide technical parameters and theoretical help for shearing strength variation of slope during rainfall and strength state of soil structure in normal water level.

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