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砂土液化深度历来是工程界颇为关心的问题.以往研究砂土液化深度多靠间接或宏观的方法,因而取得的结果彼此间差别很大,本文提出一种建立在喷砂同地下砂层直接对比基础上的矿物学方法.唐山地震之后,作者等收集北京通县的西集、王庄(以上为 Ⅷ 度烈度区),河北香河县的骡子王、渠口、县城大气所(以上为 Ⅶ 度区)等五个钻孔剖面上的砂样及地表喷砂、并进行矿物与颗粒成分的研究.结果表明,西集喷砂同地下12.26米砂层类似;王庄喷砂同地下11.02米砂层类似;骡子王喷砂同地下12.3米砂层类似;大气所喷砂同地下9.2米砂层类似;渠口喷砂同地下11.28米砂层类似.据此可以认为,唐山地震时北京通县与河北香河等地的 Ⅶ 和 Ⅷ 度烈度区的最大液化深度不超过12.30米,变化在9.2—12.30米之间,Ⅶ 度区有可能更浅些.
Sand liquefaction depth has always been a concern in engineering .In the past, the depth of sand liquefaction mostly by indirect or macroscopic methods, and the results obtained very different from each other, this paper presents a sandblasting with the underground sand Direct comparison based on the method of mineralogy.After the Tangshan earthquake, the author collected Beijing Tongxian West set, Wang Zhuang (above the VIII degree intensity area), Hebei Xianghe County mule king, drains, the county atmosphere (above Ⅶ degree area) and other five drilling section of sand samples and surface sandblasting, and mineral and particulate composition of the results show that the West set sandblasting with the underground 12.26 m sand layer similar to Wangzhuang sandblasting with the ground 11.02 Similar to the sand layer, the mule king sandblasting is similar to the 12.3 m underground sandstone; the sand blasting in the atmosphere is similar to the 9.2 m sand layer in the underground; the drainage sandblasting is similar to the 11.28 m sand layer in the ground, which indicates that Tangshan earthquake occurred in Beijing The maximum depth of liquefaction at Ⅶ and Ⅷ intensity zones in Tongxian and Xianghe, Hebei, is no more than 12.30 meters, with a variation of 9.2-12.30 meters, and the area of Ⅶ degree may be shallower.