Temperature effects on geotechnical properties of kaolin clay: Simultaneous measurements of consolidation characteristics, shear stiffness, and permeability using a modified oedometer
Temperature effects on geotechnical properties of kaolin clay: Simultaneous measurements of consolidation characteristics, shear stiffness, and permeability using a modified oedometer
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DOI：
10.5176/2335-6774_1.1.1
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发表时间：
2013-04
影响因子：
2.5
通讯作者：
E. Mon;S. Hamamoto;K. Kawamoto;T. Komatsu;P. Møldrup
中科院分区：
文献类型：
--
作者：
E. Mon;S. Hamamoto;K. Kawamoto;T. Komatsu;P. Møldrup
包括地源热泵（GSHPs）在内的浅层地热能源系统在世界范围内的使用增加，引起了对土壤岩土性能可能产生的温度影响的关注。研究了温度对高岭土固结沉降、抗剪刚度和渗透性等力学特性的影响。开发并使用了一种改进的里程表装置，可以同时测量固结沉降、剪切波速和水力导电性。在三种不同温度（5°C、15°C和40°C）下依次增加固结压力，对预固结高岭土样品（两种样品尺寸：φ 6 cm x H 10 cm和φ 6 cm x H 2 cm）进行固结试验。在较高温度（40°C）下，两种样品尺寸的表观预固结压力Pac均较大，但仅适用于初始孔隙比在1.53至1.62之间的样品。在较高温度下，样品的剪切模量相对较高，作为孔隙比的函数，这表明织物结构的变化（可能是由于粘土颗粒之间的颗粒间力在较高温度下增强）导致剪切刚度增加，因此在40°C时Pac更高。相反，温度对2013年2月5日收到的稿件的影响。本工作部分资金由埼玉大学研究管理局、日本科学促进会（JSPS）科学研究资助基金（No.22860012）和日本科学促进会双边研究项目资助。这项工作也得到了CREST项目的部分支持，该项目是日本科学技术机构（JST）的一项研究资助。E. E. Mon就职于埼玉大学科学与工程研究生院，地址：255 Shimo-okubo， Sakura ku, Saitama, 338-8570，日本。(电话/传真：（+81）48-858-3116；电子邮件:nyima.eimon@gmail.com)。S. Hamamoto，就职于日本埼玉大学科学与工程研究生院和环境科学与技术研究所，邮编：338-8570，埼玉樱区下久保255号。（e-mail: hamasyo@mail.saitama-u.ac.jp） K. Kawamoto就职于埼玉大学科学与工程研究生院和环境科学与技术研究所，日本埼玉市樱区下久保255号，338-8570。(电子邮件:kawamoto@mail.saitama-u.ac.jp)。小松先生就职于埼玉大学科学与工程研究生院和环境科学与技术研究所，邮编：338-8570，日本埼玉市樱花区下久保255号。(电子邮件:komatsu@mail.saitama-u.ac.jp)。P. Modrup就职于奥尔堡大学生物技术、化学和环境工程系，丹麦奥尔堡9000。(电子邮件:pm@bio.aau.dk)。在5 ~ 40℃的温度范围内，高岭土的渗透性不显著。
The increased worldwide use of shallow geothermal energy systems including ground source heat pumps (GSHPs) have given concerns of possible temperature effects on soil geotechnical properties. In this study, the effects of temperature on mechanical characteristics such as consolidation settlement, shear stiffness, and permeability of kaolin clay were investigated. A modified oedometer apparatus which allows the simultaneous measurements of consolidation settlement, shear wave velocity, and hydraulic conductivity was developed and used. Consolidation tests on preconsolidated kaolin samples (two sample sizes: ϕ 6 cm x H 10 cm and ϕ 6 cm x H 2 cm) were performed under sequentially increasing consolidation pressures at three different temperatures (5 °C, 15 °C, and 40 °C). Larger apparent preconsolidation pressure, Pac, was seen at higher temperature (40 °C) for both sample sizes, but only for samples having relatively high initial void ratios between 1.53 and 1.62. Relatively higher shear modulus as a function of void ratio was observed for samples at higher temperature, suggesting that changes in fabric structure (likely caused by enhanced inter-particle forces between clay particles at higher temperature) resulted in the increased shear stiffness and, thus, higher Pac at 40 °C. Oppositely, temperature effects on the Manuscript received February 5, 2013. This work was partly funded by a grant from the Research Management Bureau, Saitama University, the grant-in-Aid for Scientific Research of Japan Society for the Promotion of Science (JSPS) (No.22860012), and a JSPS bilateral research project. This work was also partially supported by a CREST project, a research grant from the Japan Science and Technology Agency (JST). E. E. Mon is with Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura ku, Saitama, 338-8570, Japan. (phone/fax: (+81) 48-858-3116; e-mail: nyima.eimon@gmail.com). S. Hamamoto, is with Graduate School of Science and Engineering, and Institute for Environmental Science and Technology, Saitama University, 255 Shimo-okubo, Sakura ku, Saitama, 338-8570, Japan. (e-mail: hamasyo@mail.saitama-u.ac.jp) K. Kawamoto is with Graduate School of Science and Engineering, and Institute for Environmental Science and Technology, Saitama University, 255 Shimo-okubo, Sakura ku, Saitama, 338-8570, Japan. (e-mail: kawamoto@mail.saitama-u.ac.jp). T. Komatsu is with Graduate School of Science and Engineering, and Institute for Environmental Science and Technology, Saitama University, 255 Shimo-okubo, Sakura ku, Saitama, 338-8570, Japan. (e-mail: komatsu@mail.saitama-u.ac.jp). P. Modrup is with Department of Biotechnology, Chemistry, and Environmental Engineering, Aalborg University, 9000 Aalborg, Denmark. (e-mail: pm@bio.aau.dk). permeability of kaolin clay were not significant within the studied temperature range between 5 °C and 40 °C.