Examining efficient assisting geotechnology for permeation grouting of ultra microfine cement for soil liquefaction countermeasure

Soil-liquefaction-related hazards can damage structures or lead to an extensive loss of life and property. Therefore, the stability and safety of structures against soil liquefaction are essential for evaluation in earthquake design. In practice, the simplified liquefaction analysis procedure associated with numerical simulation analysis is the most used approach for evaluating the behavior of structures or the effectiveness of mitigation plans. First, the occurrence of soil liquefaction is evaluated using the simplified procedure. If soil liquefaction occurs, the resulting structural damage or the following mitigation plan is evaluated using the numerical simulation analysis. Rational and comparable evaluation results between the simplified liquefaction analysis procedure and the numerical simulation analysis are achieved by ensuring that the liquefaction constitutive model used in the numerical simulation has a consistent liquefaction resistance with the simplified liquefaction analysis procedure. In this study, two frequently used liquefaction constitutive models (Finn model and UBCSAND model) were calibrated by fitting the liquefaction triggering curves of most used simplified liquefaction analysis procedures (NCEER, HBF, JRA96, and T-Y procedures) in Taiwan via FLAC program. In addition, the responses of two calibrated models were compared and discussed to provide guidelines for selecting an appropriate liquefaction constitutive model in future projects.

Download Full-text

Seismic Soil-Structure Interaction of Cross Sections of Flexible Underground Structures Subjected to Soil Liquefaction

SOILS AND FOUNDATIONS ◽

10.1016/s0038-0806(20)30803-9 ◽

2003 ◽

Vol 43 (2) ◽

pp. 69-87 ◽

Cited By ~ 8

Author(s):

Yukio Tamari ◽

Ikuo Towhata

Keyword(s):

Cross Sections ◽

Soil Structure ◽

Soil Liquefaction ◽

Soil Structure Interaction ◽

Underground Structures ◽

Structure Interaction

Download Full-text

The adoption of ELM to the prediction of soil liquefaction based on CPT

Natural Hazards ◽

10.1007/s11069-021-04594-z ◽

2021 ◽

Author(s):

Yong-gang Zhang ◽

Junbo Qiu ◽

Yan Zhang ◽

Yongyao Wei

Keyword(s):

Soil Liquefaction

Download Full-text

Sustainable Measures for Protection of Structures Against Earthquake Induced Liquefaction

Indian Geotechnical Journal ◽

10.1007/s40098-021-00535-6 ◽

2021 ◽

Author(s):

Gopal S. P. Madabhushi ◽

Samy Garcia-Torres

Keyword(s):

Soil Liquefaction ◽

Excess Pore Pressure ◽

Economic Losses ◽

Element Analysis ◽

Centrifuge Testing ◽

Centrifuge Tests ◽

Liquefiable Soil ◽

Recent Earthquakes ◽

Excess Pore Pressures ◽

Excess Pore

AbstractSoil liquefaction can cause excessive damage to structures as witnessed in many recent earthquakes. The damage to small/medium-sized buildings can lead to excessive death toll and economic losses due to the sheer number of such buildings. Economic and sustainable methods to mitigate liquefaction damage to such buildings are therefore required. In this paper, the use of rubble brick as a material to construct earthquake drains is proposed. The efficacy of these drains to mitigate liquefaction effects was investigated, for the first time to include the effects of the foundations of a structure by using dynamic centrifuge testing. It will be shown that performance of the foundation in terms of its settlement was improved by the rubble brick drains by directly comparing them to the foundation on unimproved, liquefiable ground. The dynamic response in terms of horizontal accelerations and rotations will be compared. The dynamic centrifuge tests also yielded valuable information with regard to the excess pore pressure variation below the foundations both spatially and temporally. Differences of excess pore pressures between the improved and unimproved ground will be compared. Finally, a simplified 3D finite element analysis will be introduced that will be shown to satisfactorily capture the settlement characteristics of the foundation located on liquefiable soil with earthquake drains.

Download Full-text

Predicting the liquefaction potential of soil layers in Tabriz city via artificial neural network analysis

SN Applied Sciences ◽

10.1007/s42452-021-04704-3 ◽

2021 ◽

Vol 3 (7) ◽

Author(s):

Mohammad Alizadeh Mansouri ◽

Rouzbeh Dabiri

Keyword(s):

Neural Network ◽

Artificial Neural Network ◽

Soil Liquefaction ◽

Data Sets ◽

Liquefaction Potential ◽

Advantages And Disadvantages ◽

Artificial Neural ◽

Artificial Neural Network Ann ◽

Prediction Approach ◽

Empirical Approaches

AbstractSoil liquefaction is a phenomenon through which saturated soil completely loses its strength and hardness and behaves the same as a liquid due to the severe stress it entails. This stress can be caused by earthquakes or sudden changes in soil stress conditions. Many empirical approaches have been proposed for predicting the potential of liquefaction, each of which includes advantages and disadvantages. In this paper, a novel prediction approach is proposed based on an artificial neural network (ANN) to adequately predict the potential of liquefaction in a specific range of soil properties. To this end, a whole set of 100 soil data is collected to calculate the potential of liquefaction via empirical approaches in Tabriz, Iran. Then, the results of the empirical approaches are utilized for data training in an ANN, which is considered as an option to predict liquefaction for the first time in Tabriz. The achieved configuration of the ANN is utilized to predict the liquefaction of 10 other data sets for validation purposes. According to the obtained results, a well-trained ANN is capable of predicting the liquefaction potential through error values of less than 5%, which represents the reliability of the proposed approach.

Download Full-text