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

本研究分析了前心墙式大坝心墙出现裂缝时的措施，并获得了知识。二维有限元法检查了裂缝的深度方向。因此，大坝成为危险，提出了心墙裂缝的施工测量方法，验证了该方法的有效性，通过有限元分析和砂模试验，阐明了防渗墙的施工措施，结果表明，施工措施抑制了由于芯墙裂缝引起的浸润线上升，安全地绘制了浸润线。通过三维有限元分析了局部裂缝对防渗墙的影响。对于裂缝部位也会引起浸润线上升的情况，在10%左右的坝面附近看不到裂缝，如果超过横向的70%，则整个坝的心墙作用丧失，与均质型坝的浸润线相似。

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.