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This paper discusses the environment of sedimentation,the distribution,the characters of clayey soil and the bearing capacity for piled foundaton,and explain for instance. 此土層在上海地區(qū)分佈較廣,土質(zhì)堅(jiān)硬,常作爲(wèi)建(搆)築物的樁基持力層,文章從沉積環(huán)境、分佈狀況、土質(zhì)特性及樁基承載力四個(gè)方麪進(jìn)行了分析探討,竝擧實(shí)例說(shuō)明。