Thermal Triaxial Tests to Evaluate Improvement of Soft Marine Clay through Thermal Consolidation

被引：9

作者：

Huancollo, Hiden Jaime Machaca ^{[1
]}

Saboya Jr, Fernando ^{[1
]}

Tibana, Sergio ^{[1
]}

McCartney, John Scott ^{[2
]}

Borges, Ricardo Garske ^{[3
]}

机构：

[1] State Univ Norte Fluminense Darcy Ribeiro, Dept Civil Engn, UENF, Ave Alberto Lamego 2000 CCT,Campos Goytacazes, BR-28016812 Rio De Janeiro, Brazil

[2] Univ Calif San Diego, Dept Struct Engn, 9500 Gilman Dr, La Jolla, CA 92093 USA

[3] Univ Fed Rio De Janeiro, Cidade Univ,Ave Horacio Macedo 950, BR-21941915 Rio De Janeiro, Brazil

来源：

GEOTECHNICAL TESTING JOURNAL | 2023年 / 46卷 / 03期

基金：

美国国家科学基金会;

关键词：

thermal consolidation; thermal creep; shear strength; marine clay; THERMOMECHANICAL MODEL; SHEAR-STRENGTH; VOLUME CHANGE; MECHANICAL-BEHAVIOR; CONSTITUTIVE MODEL; SATURATED CLAYS; TEMPERATURE; SOILS;

D O I：

10.1520/GTJ20220154

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

This paper presents an experimental study on the thermomechanical behavior of marine clay from the Santos Basin off the coast of Brazil. The aim of the study is to assess the gain undrained shear strength of reconstituted, normally consolidated (NC) clay specimens after drained thermal consolidation using a thermal triaxial device. The motivation behind performing these tests is that relatively few studies in the literature have focused on understanding the changes in shear strength of NC clays after a heating-cooling cycle, a path encountered in using heat to improve the properties of soft clays. Furthermore, the high-plasticity marine clays evaluated in this study have a pronounced thermal creep different from that observed in previous non-isothermal tests on clays. Consolidated isotropic undrained triaxial compression tests were performed on specimens consolidated to effective stresses of 100 kPa, 200 kPa, and 400 kPa and then sheared conventionally at room temperature as well as after drained heating-cooling cycles with maximum temperatures of 40 degrees C and 55 degrees C. The results were analyzed according to critical state soil mechanics after drained thermal consolidation, which was well suited to explain the improvement in undrained shear strength. The results have potential implications on the development of techniques that can promote thermal improvement of deep-water offshore anchors installed in soft soil.

引用

页码：579 / 597

页数：19

共 63 条

[1] Volume change behaviour of saturated clays under drained heating conditions: experimental results and constitutive modeling [J].