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为了进行兰州市区的场地小区划,在市区75个点上做了地面脉动观测。观测表明,地面脉动具有明显的区域性。市区不同地点的傅氏谱多少都有相似之处,多数谱峰值出现在0.3—0.45秒范围内。但是在兰州市的不同地段,谱形上也有一定的差别。根据谱形,可将市区划分为5个地区。由此可以想见,地面脉动特征取决于整个区域的综合自然条件,局部表土层的条件反居次要地位。地面脉动的最大幅值显然取决于表层较软土层,如黄土、亚粘土、亚砂土等的厚度,这些软土层的厚度越大,地面脉动的最大幅值也就越大。地面脉动观测结果可用之于场地土小区划分中去。
In order to carry out the zoning of Lanzhou urban area, ground pulsation observation was done at 75 spots in the urban area. Observations show that the ground pulsation has a clear regional. Fu Lu spectrum in different locations in the urban areas have similarities, the majority of the peak appears in the range of 0.3-0.45 seconds. However, in different locations in Lanzhou, the spectrum also has some differences. According to the spectrum, the city can be divided into five regions. It can be imagined that the pulsation characteristics of the ground depend on the comprehensive natural conditions of the entire area, and the conditions of the local topsoil revert to the secondary status. The maximum amplitude of the ground pulsation obviously depends on the thickness of the softer soil layers, such as loess, loam, sandy soil, etc. The greater the thickness of these soft soil layers, the greater the maximum amplitude of ground pulsation. Ground pulsation observations can be used in the site of soil and land divisions.