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前 言 本挡水墙建在爱知县知多半岛中部的常滑市,是县营农用填筑式坝例(前山大坝)。 大坝的主要问题是:在右岸边墩处有很厚的未胶结砂岩层的露头,产生地下水渗透,大坝下游附近,有时产生基础渗透破坏。为在砂岩层获得挡水效果,采用了沥青地下连续挡水墙作为防治的措施。此法的最大特点是:改变沥青混合料的弹性系数及配合比,可以得到与(山体)围岩一样的刚度比,减少地震的剥落、裂缝(龟裂),而且对一些裂缝具有自愈能力。
Foreword The retaining wall was built in Tokoname-shi, Chita, a town in central Chita-Aichi, Aichi prefecture. It is a prefectural farm filling dam (former Yamamoto dam). The major problems with dams are the outcrop of thick, unconsolidated sandstone formations on the right bank piers, resulting in the infiltration of groundwater and the near infiltration of the dam, sometimes with underlying infiltration and destruction. In order to obtain the water retaining effect in the sandstone layer, an asphalt underground continuous retaining wall is adopted as a prevention and control measure. The most important feature of this method is that changing the elastic modulus and mixing ratio of asphalt mixture can get the same stiffness ratio as that of (mountainous) surrounding rock, reducing the spalling and cracking of the earthquake (crack), and also has the ability of self-healing for some cracks .