STUDY ON A SAFETY METHOD OF DAM WHEN A CRACK ARISES IN THE CORE PART THE FRONT CORE TYPE DAM

前心式坝核心部分出现裂缝时大坝安全方法的研究

• 批准号: 11660236
• 负责人: KADONO Miyoshi
• 金额: $ 2.24万
• 依托单位: Hirosaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11660236/
• 关键词: Front Core Type Dam; Fill Dam; Crack; Finite Element Method; Surface Seepage; Safety Method; Three Dimensional Analysis; FEM; FEM解析; 浸潤面; 老朽化溜池堤体; 堤体補修; 前刃金

This research was analyzed in the following procedures about the measure when a crack arises to the core of a front core type dam, and acquired knowledge.Two-dimensional FEM examined the depth direction to a crack.Consequently, it turns out that a dam becomes danger, so that the crack was close to the reservoir surface of dam.The measure method of construction to the crack of a core was proposed.Validity of this measure method of construction was clarified in FEM and the experiment of sand model.It turns out that a measure method of construction suppresses a rise of the seepage line by the crack of a core, and a seepage line is drawn safely.It analyzed about the influence by the partial crack by 3-dimensional FEM.As for a rise of the seepage line projected also in the crack part, the crack near the reservoir surface of dam is not seen at about 10 %.If 70 % of the cross direction is exceeded, the effect of core of whole dam is lost and the seepage line of a homogeneous type dam is resembled.

本研究通过对前心墙坝心墙裂缝发生时的测量进行分析，获得了相关知识。二维有限元对裂缝的深度方向进行了检验。结果表明，大坝变得危险，裂缝靠近坝的库面。提出了心墙裂缝的施工测量方法。通过有限元和砂模型试验，阐明了这种施工测量方法的有效性。结果表明，施工测量方法抑制了心墙裂缝引起的浸润线的上升，用三维有限元方法分析了局部裂缝对坝体的影响，对于裂缝部位也投射出的浸润线，坝体库面附近未见10%左右的裂缝，超过70%的横向，整个坝体的心墙效应丧失，与均质坝的渗流线相似。