Deformation characteristics of clays at deep position of ground and its time dependency

地基深层黏土变形特征及其时间依赖性

• 批准号: 03650405
• 负责人: MATSUI Tamotsu
• 金额: $ 1.02万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650405/
• 关键词: Pleistocene deposits; Consolidation Characteristics; Constant rate of strain consolidation test; Shear Characteristics; Undrained strength; Void Index; Simulation analysis; Mechanical parameter; ミニ3軸圧縮試験; 洪積粘土; 定ひずみ速度圧密; 時間依在性; 大深度海底堆積粘土; 時間依

In this study, the effect of time dependency on the mechanical characteristics of undisturbed clays is investigated, which is in the Pleistocene deposits at the off-Senshu area in Osaka Bay. Also, the method for predicting deformation of the ground is proposed. The main conclusions are summarized as follows:1. A constant rate of strain consolidation apparatus for semi-high pressure was developed. The consolidation characteristics of undisturbed clays taken from the Pleistocene deposits at the off-Senshu area in Osaka Bay was investigated. Firstly, the effect of such test conditions as strain rate and back pressure on the consolidation characteristics was investigated. It is found that the strain rate significantly affects consolidation yield stresses in the constant rate of strain consolidation tests. Next, a constant rate of strain consolidation apparatus for semi-high pressure could be applicable to the undisturbed clays in the Pleistocene deposits, which have higher yield stresses than the alluvial clays.2. The undrained shear characteristics of the undisturbed clays in the Pleistocene deposits was investigated through mini-triaxial tests. The undrained shear tests of the reconstituted clays were carried out to investigate the "aging" effect on shear characteristics. The linear relationship between logarithmic maximum deviator stresses and void ratios was observed on both the undisturbed and reconstituted clays. It was shown that the effect of initial void ratio on shear strengths can be excluded through using the void index or the e_L.3. A method for determining elasto-viscoplastic parameters for the undisturbed clays in the Pleistocene deposits using mini-triaxial tests and consolidation tests was proposed. The reliability of the determined parameters was investigated through the numerical simulation analysis of deformation behavior in triaxial tests and construction of a man-made island.

本文以大阪湾off-Senshu地区更新世沉积物为研究对象，研究了时间依赖性对未扰动粘土力学特性的影响。同时，提出了地面变形的预测方法。主要结论总结如下：1。研制了一种半高压恒速率应变固结装置。研究了大阪湾off-Senshu地区更新世未扰动粘土的固结特征。首先，研究了应变率、背压等试验条件对固结特性的影响。在恒速率应变固结试验中，发现应变速率对固结屈服应力有显著影响。其次，半高压恒速率应变固结装置可适用于具有较高屈服应力的更新世未扰动粘土。通过小三轴试验研究了更新世未扰动粘土的不排水剪切特性。通过不排水剪切试验，研究了“老化”对黏土剪切特性的影响。在原状和原状粘土中，最大偏离应力的对数与孔隙比呈线性关系。结果表明，利用孔隙指数或e_L.3可以排除初始孔隙比对抗剪强度的影响。提出了一种利用小三轴试验和固结试验确定更新世未扰动粘土弹粘塑性参数的方法。通过对三轴试验和人工岛施工变形行为的数值模拟分析，探讨了所确定参数的可靠性。

项目成果

Matsui, T: "Method for determining elasto-viscoplastic parameters using mini-triaxial test" Proc. of annual meeting of J. S. S. M. F. E. 697-698 (1992)

Matsui，T：“使用微型三轴试验确定弹粘塑性参数的方法”Proc。

松井 保・小田 和広 鍋島 康之・北畠 肇: "中圧ミニ三軸試験による泉州沖洪常粘性土のせん断特性" 平成4年度関西支部年次学術講演会講演概要. 3-8-1-2 (1992)

Tamotsu Matsui、Kazuhiro Oda、Yasuyuki Nabeshima、Hajime Kitabatake：“中压微型三轴试验全主冲本城粘土的剪切特性”1992年关西分会学术年会摘要3-8-1-2（1992年）。

松井 保・小田 和広 鍋島 康之・北畠 肇: "中圧ミニ三軸試験による弾粘塑性パラメータの決定方法" 第27回土質工学研究発表会平成4年度発表講演集. Vol.1. 697-698 (1992)

Tamotsu Matsui、Kazuhiro Oda、Yasuyuki Nabeshima、Hajime Kitabatake：“使用中压微型三轴试验确定弹粘塑性参数的方法”第 27 届土壤工程研究会议记录 1992 年 1. 697-698（1992 年）

松井 保・小田 和広,鍋島 康之・北畠 肇: "中圧ミニ3軸試験による弾粘塑性パラメータの決定方法" 第27回土質工学研究発表会発表概要集. 2の1. 697-698 (1992)

Tamotsu Matsui、Kazuhiro Oda、Yasuyuki Nabeshima 和 Hajime Kitabatake：“使用中压微型三轴试验确定弹粘塑性参数的方法”第 27 届土壤工程研究会议演示文稿摘要 697-698。

松井 保,小田 和広,鍋島 康之,北畠 肇: "中圧ミニ三軸試験による弾粘塑性パラメ-タの決定方法" 土質工学研究発表会講演集. (1992)

Tamotsu Matsui、Kazuhiro Oda、Yasuyuki Nabeshima、Hajime Kitabatake：“使用中压微型三轴试验确定弹粘塑性参数的方法”土壤工程研究会议论文集（1992 年）。