Determination of Consolidation Constants by Use of Standard Oedometer Tests for the Purpose to Construct a New Constitutive Equation Taking Time effects into Consideration.

使用标准里程计测试确定固结常数，以构建考虑时间效应的新本构方程。

• 批准号: 08455219
• 负责人: IMAI Goro
• 金额: $ 4.67万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455219/
• 关键词: clay; consolidation; primary consolidation; secondary consolidation; standard oedometer test; Creep; Consolidation constant; 構成式; 弾塑性; 粘性; 過圧密; 先行圧密応力

Consolidation constants should be defined by use of effective stress. However, because of no measurement of pore water pressure. the constants have not been determined in terms of effective stress as continuously changing indices. For the purpose to overcome this barrier, a new testing method artificially varying pore water pressures at the top and bottom surfaces of a specimen was developed in this study. By use of the new method, effective- stress analyses have been proved to be applicable even for step-loading type tests, arid compression behaviors represented by C_s and C_c have been precisely examined. Furthermore. a new type of constant-gradient consolidation test procedure was developed based on the idea of water pressure control, and the much more reliable compression constants as well as permeability behaviors represented by the coettiwent of permeability, k, have been determined in the terms of continuously changing effective stress.Based on the results stated above, a firm foundation on which the latest constitutive equation could be constituted has been obtained.

固结常数应采用有效应力来确定。然而，由于没有测量孔隙水压力。这些常数还没有根据作为连续变化指数的有效应力来确定。为了克服这一障碍，在这项研究中，一个新的测试方法，人工改变孔隙水压力的顶部和底部表面的标本。用这种方法，即使在分级加载试验中，有效应力分析也是适用的，并精确地检验了用C_s和C_c表示的压缩性能。此外。基于水压控制的思想，提出了一种新的等梯度固结试验方法，确定了在有效应力连续变化条件下更为可靠的压缩常数和以渗透系数k表示的渗透特性，并在此基础上，为建立最新的本构方程奠定了坚实的基础。

项目成果

今井五郎,吉川智勝,田中洋輔,藤野秀隆: "先行圧密応力付近の載荷圧下での二次圧密挙動" 第33回地盤工学研究発表会(山口). No.230. 465-466 (1998)

Goro Imai、Tomokatsu Yoshikawa、Yosuke Tanaka、Hidetaka Fujino：“预固结应力附近的加载压力下的二次固结行为”第 33 届岩土工程研究会议（山口）第 230. 465-466 号（1998 年）。

Imai, G., Y,Tanaka: "Effect of back pressure on pore-water pressure and displacement in unloading-reloading process of consolidation" Proc.of the 51-st Annual Couf.of the Japan Soc.of Civil Engineers. Vol.3-A,No.174. 348-348 (1996)

Imai, G., Y,Tanaka：“固结卸载-再加载过程中背压对孔隙水压力和位移的影响”日本土木工程学会第 51 届年度会议论文集。

Imai, G., Tanaka. , Tsujimura, T.: "Stress-straiu behovior during unloading-reloading process in oedmeter test" The 32-nd Japan National Conf.on S.M.F.E.No.213. 423-424 (1997)

今井，G.，田中。

今井五郎・藤野秀隆・他: "段階載荷試験による粘性土の膨潤指数" 第33回地盤工学研究発表会概要集. 1. (1998)

今井五郎、藤野秀隆等：《粘性土的膨胀指数分阶段加载试验》第33届岩土工程研究会议摘要集1.(1998)。

G.Imai & B.C.Hawlader: "An elasto-viscoplastic analysis of self weight consolidation during continuous sedimentation(受理済)" Proc.of Intern,Conf.on Nemerical analyses in geotechnical engineering (Wuhan). Vol.1. (1997)

G.Imai 和 B.C.Hawlader：“连续沉降过程中自重固结的弹粘塑性分析（已接受）”Proc. of Intern,Conf.on Nemerical analysis in geotechnical Engineering (Wuhan) (1997)。