COOPERATIVE RESEARCH ON THE PREDICTION METHODS AND EVALUATION OF DEFORMATION OF EARTHSTRUCTURES FOUNDED ON SOFT FOUNDATIONS DURING EARTHQUAKES

软土地基土结构地震变形预测方法与评价合作研究

• 批准号: 06302046
• 负责人: ISHIHARA Kenji
• 金额: $ 9.28万
• 依托单位: SCIENCE UNIVERSITY OF TOKYO (1995)The University of Tokyo (1994)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Co-operative Research (A)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06302046/
• 关键词: SOFT GROUND; POST-EARTHQUAKE DEFORMATION; LIQUEFACTION; PERMANENT DEFORMATION; LATERAL FLOW; 地震; 水平変位

Case histories and studies of damages caused by ground deformation due to recently hit earthquakes, e.g. Sanriku Haruka-Oki Earthquake, Kushiro-Oki Earthquake and Hyogo-Ken Nanbu Earthquake, are first made in this study. Laboratory tests, such as triaxial compression apparatus, hollow cylinder appartus and ring shear apparatus, are conducted to investigate deformation behavior of sandy soils. It is reported that each type of earth structures possesses a specific mechanism governing the ground deformation, and it is desirable to deduct an appropriate mechanism involved in each case study for analyzing it. Especially, triaxial compression test results on soils containing large grains sampled from the Kobe Port Island which experienced extensive liquefaction are reported. As a result of this study, it is found that deformation characteristics of soils depend on the depositional structures and the pore water pressure suddenly rises upon unloading immediately after the shear strain exceeds 5 %. Shaking table tests are carried out to examine countermeasures against floatation of buried pipes in liqiefied ground and deformation of surrounding ground. it is found that the amount of the pipe floatation depends heavily on the movement of the surrounding soil, and the countermeasures against such soil movement is devised and experimentally verified. A deformation analysis method on lateral ground flow is proposed, based on the energy principle. It is capable of coping with a variety of boundary conditions. In this study, it is applied to solve the deformation mechanism occuring at the river dikes protected by sheet piles subject to earthfill weight. As a result of this study, this analytical method is verified for the ground flow involving a large area.

本研究首次对近年来发生的地震，如三陆町春崎地震、钏路町地震和兵库县南部地震等，进行了地面变形造成的破坏的案例研究。采用三轴压缩试验、空心圆筒试验和环剪试验对砂质土的变形特性进行了研究。据报道，每种类型的土结构都具有控制地面变形的特定机制，并且希望在每个案例研究中推导出适当的机制来分析它。特别报道了神户港岛大颗粒土的三轴压缩试验结果。研究发现，土体的变形特征与沉积结构有关，剪切应变超过5%后，土体的孔隙水压力在卸荷时突然升高。通过振动台试验研究了液化地面埋管浮沉及周围地面变形的防治措施。研究发现，管道浮力的大小在很大程度上取决于周围土体的运动，并提出了相应的对策，并进行了实验验证。提出了一种基于能量原理的侧向地流变形分析方法。它能够处理各种边界条件。本研究将其应用于求解板桩护岸堤防在填土自重作用下的变形机理。研究结果表明，该分析方法适用于大面积地流。

项目成果

浜田政則ら: "(財)地震予知総合研究振興会" 1995年兵庫県南部地震-液状化,地盤変位及び地盤条件, 194 (1995)

Masanori Hamada 等：《地震预测研究基金会》1995 年兵库县南部地震 - 液化、地面位移和地面状况，194 (1995)

豊田浩史,東畑郁生: "液状化した砂地盤の側方流動に関する振動台実験" 地震工学シンポジウム論文集. 1. 853-858 (1994)

Hiroshi Toyota、Ikuo Higashihata：“液化沙地侧流振动台实验”地震工程研讨会论文集 1. 853-858 (1994)。

T.SATOH ET AL.: "CAUSALITY REQUIREMENT FOR EQUIVALENT LINERARIZATION ANALYSIS OF THE NON-LINEAR SEISMIC RESPONSE OF LIQUEFIED GROUND" EARTHQUAKE GEOTECHNICAL ENGINEERING,BALKEMA. VOL.1. 499-504 (1995)

T.SATOH 等人：“液化地面非线性地震响应的等效线性化分析的因果关系要求”地震岩土工程，Balkema。

Masanori Hamada,Hiroshi Sato: "Mechanism of Liquefaction-Induced Large Ground Displacement" Proc.of the 4th U.S-Japan Workshop on Soil Liquefaction. 91-104

Masanori Hamada、Hiroshi Sato：“液化引起的大地面位移的机制”，第四届美日土壤液化研讨会论文集。

S.YASUDA ET AL.: "STRESS-STRAIN RELATIONSHIPS OF LIQUEFIED SANDS" EARTHQUAKE GEOTECHNICAL ENGINEERING,BALKEMA. VOL.2. 811-816 (1995)

S.Yasuda 等人：“液化砂的应力-应变关系”地震岩土工程，巴尔克马。