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怀洪新河粘土区铲运机施工筑堤中,在上土厚度合格的地段,常常抽检出蜂窝状的空松点,其体积小的5厘米见方,大的直径可达30厘米。用环刀取样,往往取不成或取样试验结果干密度很低,一般在1.30～1.45克每立方厘米之间。为了方便起见,我们暂把抽检中所遇到的这样的点称作“盲点”。“盲点”的大量存在,成为堤坝的隐患,必须设法消除。“盲点”的产生,主要与气候和施工方法有关。春夏两季,尤其是春季,气候比较干燥,土料水分蒸发很快,在晴好或有风的天气,表层土料一小时就会产生干碴,三小时就会丧失表层水分。干燥后的土料上堤或干燥后的土料平整碾压,是形成“盲点”的重要原因。由于实行单机承包责任制施工,料场被划分成每单机一块,形成了诸多垂直于堤的条
Huai-hsin new river clay scraper construction embankment, the thickness of the soil on the lot, often sampling honeycomb-like air pine, its small size 5 cm square, large diameter up to 30 cm. Sampling with a ring knife, often fail to take or sampling test results dry density is very low, generally between 1.30 ~ 1.45 grams per cubic centimeter. For the sake of convenience, we temporarily refer to such points encountered in sampling as “blind spots.” The existence of a large number of “blind spots” has become a hidden danger of embankments and must be eliminated. The “blind spots” are mainly related to climate and construction methods. Spring and summer, especially in spring, the climate is dry, soil moisture evaporates quickly, in fine or windy weather, the surface material will produce dry matter an hour, three hours will lose the surface moisture. After drying the material on the embankment or dry soil after the formation of compacted, is to form a “blind spot” an important reason. Due to the implementation of a single contract responsibility system construction, yard is divided into a single piece, forming a lot of vertical bars