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一、地基与震灾墨西哥城是一个湖上城市。有些地方在六、七百年前的阿斯特克时代,曾于水深约5米的浅湖中心的岛上建造神殿,并在其周围填湖造田,从事浮岛农业。到了西班牙殖民地时代,又继续不断地扩大填湖面积,最后变成现在的样子。表层30—50米为冲积层,由砂、淤泥、粘土、腐蚀土构成,非常松软。其下为火山喷出物堆积而成的新洪积层,但它并不像日本的洪积层那样坚硬,而是硬软兼有的互层。另外,墨西哥城是个盆地,四周群山环抱,市区内只要挖两米深就有地下水涌出,为超松软地基。如果把水注入盆中并将其摇动,则会
First, the foundation and earthquake Mexico City is a lake city. In some places, in the period of Astek, six or seven hundred years ago, some places built shrines on the island center of the shallow lake at a depth of about 5 meters and built lakes around the lake to engage in farming on floating islands. By the time of the Spanish colonial era, they continued to expand the area of filling lakes and eventually turned into what they are now. The surface of 30-50 meters for the alluvial layer, made of sand, silt, clay, corrosive soil, very soft. Underneath is a new flood buildup from volcanic eruptions, but it is not as hard as the Japanese flood strata, but a hard and soft interbedded layer. In addition, Mexico City is a basin surrounded by mountains, as long as digging two meters downtown in the groundwater gushing, over-soft ground. If water is poured into the bowl and shaken, it will be