Research on reliability design method of agricultural infrastructures for earthquakes.

农业基础设施抗震可靠性设计方法研究

• 批准号: 06556037
• 负责人: FUJII Hiroaki
• 金额: $ 2.43万
• 依托单位: Okayama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06556037/
• 关键词: Probability of liquefaction; Farm pond; Dynamic shear strength; Monte Carlo simulation; Ground improvement; Sand compaction pile; Hyogoken-Nanbu earthquake; Quantificaioton theory II; N値; 地盤統計学; クリッギング; 多変量解析; 非排水繰り返し三軸試験; スウェーデン式サウンディング; 動的

This research is divided into following two parts.1. Reliability design of embankment constructed by sandy material for prevention of liquefaction.In this research, the calculation method for the probability of liquefaction in a sandy ground and the reliability design method for liquefaciton are discussed.Usually, the liquefaction resistance is simply determined from the effective vertical stree sigma_v', theSPT blow count N,the median grain size D_<50> and the fines content F_c with the empirical equation. The last three parameters generally have large spatial variability and the statistical models of these parameters are required for the liquefaction analysis. These statistical models were determined by minimizing AIC here.The dynamic load by the earthquake was determined based on 1) the deterministic design maximum acceleration, or 2) the statistical model of the annual maximum acceleration. The statistical model was decided from the historical earthquake data records. The maximum acceleration is probabilistic parameter in the latter case.The Monte Carlo method was applied for all probabilitic parameters and probability of liquefaction in a sandy ground was evaluated. Finally, the optimum ground improvement method and the optimum probabiity of liquefaction are discussed, particularly the sand compaction pile method (SCP) was picked up as a ground improvement method.2. Investigation for disaster of farm ponds caused by Hyogoken-Nanbu Earthquake in Awaji Island.We research group investigated the disaster of farm ponds. Based on the investigation results, the multiple regression analysis was conducted. As a result, the relationship of the failure rate of the ponds with the distance from the earthquake source, longitudinal directions of the embankments, construction period, characteristics of the material, and geology in construction sites, was clarified. Particularly, the quantification theory II was used in the analysis here.

本研究分为以下两个部分.桑迪路堤抗液化可靠性设计本文讨论了桑迪地基液化概率的计算方法和抗液化可靠性设计方法，一般由有效竖向应力σ_v '、标准贯入击数N、中值粒径D_<50>和细粒含量F_c用经验公式简单地确定抗液化强度。后三个参数一般具有较大的空间变异性，这些参数的统计模型是液化分析所必需的。这些统计模型是通过使AIC最小化来确定的。地震动荷载是根据1）确定的设计最大加速度或2）年最大加速度的统计模型来确定的。统计模型是根据历史地震资料记录确定的。最大加速度为概率参数，采用蒙特卡罗方法计算了桑迪地基液化的概率。最后，对最优地基处理方法和液化最优概率进行了探讨，特别是选择挤密砂桩法作为地基处理方法.淡路岛兵库县南部大地震造成的农田池塘灾害调查。本研究小组对农田池塘灾害进行了调查。根据调查结果，进行了多元回归分析。结果表明，水池的破坏率与距震源的距离、水池的纵向、施工周期、材料特性和施工场地的地质条件等因素有关。特别地，在这里的分析中使用了数量化理论II。

项目成果

篠 和夫: "阪神・淡路大震災による水利施設の被害" 農業土木学会誌. 63. 1155-1160 (1995)

Kazuo Shino：“阪神淡路大地震对供水设施的损害”日本农业和土木工程师学会杂志 63. 1155-1160 (1995)。

藤井弘章: "兵庫県南部地震による北淡町のため池被害(1)" 農業土木学会中国四国支部講演会要旨集. 181-183 (1996)

藤井弘明：《兵库县南部地震对北段镇灌溉池塘的损害（1）》日本农业土木工程学会中国四国分会演讲会摘要 181-183（1996）。

Nishimura, S., Fujii H.and Shimada, K.: "Several Considerations on Probability of Liquefaction in Embankment Constructed by Sandy Material. (in Japanese)" Structural Safety and Reliability. Vol.3. 399-402 (1995)

Nishimura, S.、Fujii H. 和 Shimada, K.：“关于砂质材料建造的路堤液化概率的若干考虑。（日语）”结构安全性和可靠性。

西村伸一: "砂質材料で構築された堤防の液状化確率に関する研究" 構造物の安全性および信頼性. Vol.3. 399-402 (1995)

Shinichi Nishimura：“沙质材料路堤的液化概率研究”，结构安全与可靠性，第 3 卷（1995 年）。

西村伸一: "砂質材料で構築された堤防の液状化確率に関する研究" 構造物の安全性および信頼性. 3. 399-402 (1995)

西村新一：“砂质材料路堤液化概率研究”，结构安全性与可靠性。3. 399-402 (1995)。