Analysis of variation characteristics of negative excess pore pressure of soft clay under graded unloading

DOI

10.2991/978-94-6463-435-8_31How to use a DOI?

Keywords

Geotechnical engineering; Graded unloading; Water absorption and consolidation; Negative excess pore pressure; theoretical analysis

Abstract

At present, the study of soft clay under unloading action mainly focuses on the strength and deformation under unloading action. In order to clarify the change characteristics of negative superstatic pore pressure of soft clay under the action of graded unloading, a theoretical analysis is conducted based on the derived analytical solution of arbitrary discharge series and MATLAB unloading rate. In order to clarify the variation characteristics of the negative superstatic pore pressure of soft clay under hierarchical unloading, on the basis of the analytical solution of water absorption consolidation under arbitrary unloading level and unloading rate, the theoretical analysis is carried out by MATLAB programming assignment, and compared with the monitoring values obtained in practical engineering, so as to verify the accuracy analysis of the theory. Based on the influence of gradient unloading in the initial consolidation state on the change of negative superstatic pore pressure, it is divided into strong and weak phases, and the duration of the strong phase is related to the properties of soft soil, and increases with the decrease of the unloading level of the initial consolidation state of negative superstatic pore pressure. The extreme value of the negative superstatic pore pressure and its fluctuation amplitude were positively correlated with the graded unloading capacity, and the dissipation rate was negatively correlated with the unloading stage. The unloading level of the unloading layer of the actual project is solved by the analytical solution of suction consolidation. The theoretical values of the rebound and the change law of water absorption obtained from the actual engineering unloading level are compared and analyzed with the measured values, and the matching degree.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Zhiyong Liu
AU  - Junhao Li
AU  - Kang Xiao
AU  - Qingchao Hou
AU  - Yaoyao Li
AU  - Jingkun Li
AU  - Haitao Ren
AU  - Yinkun Wang
PY  - 2024
DA  - 2024/06/13
TI  - Analysis of variation characteristics of negative excess pore pressure of soft clay under graded unloading
BT  - Proceedings of the 2024 5th International Conference on Civil, Architecture and Disaster Prevention and Control (CADPC 2024)
PB  - Atlantis Press
SP  - 265
EP  - 280
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-435-8_31
DO  - 10.2991/978-94-6463-435-8_31
ID  - Liu2024
ER  -