|Table of Contents|

Creep characteristics of blown soft soil under drainage condition(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年4期
Page:
29-39
Research Field:
道路工程
Publishing date:

Info

Title:
Creep characteristics of blown soft soil under drainage condition
Author(s):
YANG Ai-wu1;  YANG Shao-peng1;  ZHANG Zhao-jie2
(1. School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; 2. Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment,Tianjin Urban Construction University, Tianjin 300384, China)
Keywords:
road engineering;  hydraulic fill soft soil;  drainage condition;  consolidation ratio;  creep deformation;  viscosity coefficient
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2023.04.004
Abstract:
To gain insight into the changing patterns of creep deformation and viscous properties of blown softsoils under drainage conditions, and to make effective predictions of long-term settlement of soft foundations incoastal areas. A series of creep tests were conducted using triaxial rheometer with Tianjin Binhai blown soft soil asthe research object, and the effects of different drainage conditions, surrounding pressure, consolidation ratio andinitial static deflection stress on its creep deformation were analyzed, and on this basis, the change law of viscoushysteresis coefficient under drainage conditions was explored, and the corresponding prediction model wasconstructed, meanwhile, the calculated results were verified by using the test data.Finally, a prediction formula for creep deformation of blow-filled soft soils under drainageconditions considering factors such as surrounding pressure and time was given, a prediction model for thecoefficient of viscosity at different creep deformation stages was constructed, and the feasibility of the model wasverified.The results show that drainage, increasing confining pressure, and consolidation ratio can effectively weaken the creep effect of dredgerfill soft soil. The effect of initial static deflection stress has a critical value, which reduces creep deformation whenit is less than this value, and on the contrary, creep deformation is obvious. In the process of drainage creep, theviscosity coefficient increases with the increase of confining pressure and consolidation ratio, and shows anexponential growth trend under the action of small deviatoric stress, the increase range is almost linear and therate is slow under the action of large deviatoric stress. It decreases almost linearly with the increase of the initialstatic deviatoric stress. The research results can provide reference for the construction of soft soil sites.7 tabs, 17 figs, 22 refs.

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Last Update: 2023-08-20