基于BCV模型与我国规范对中美场地类别的研究∗
Study on the Site Classifications Between Chinese and American Codes based on the BCV Model and the Definition of Chinese Codes
- 防灾减灾工程学报 2021年第2期 页码：294-303
- 作者机构：
河海大学土木与交通学院,江苏,南京,210098
- 作者简介：
- 基金信息：国家重点研发计划项目(2016YFC0401807)、国家重点研发计划项目(2016YFC0402003)资助
DOI：
中图分类号： P315.9-
纸质出版：2021
- 稿件说明：
移动端阅览
聂利英,帅娇娇,林浩然,王康,汪基伟.基于BCV模型与我国规范对中美场地类别的研究∗[J].防灾减灾工程学报,2021,(2):294-303
Nie Liying. Study on the Site Classifications Between Chinese and American Codes based on the BCV Model and the Definition of Chinese Codes[J]. 2021, (2): 294-303.
摘要
场地类别是重要的工程参数，由于中国与欧美国家的场地类别划分存在很大不同，但中美场地类别对应关系又有一定的交叉现象。通过对比中美规范，提出我国场地类别换算 VS30的核心是需要“我国规范定义的计算深度到 30 m 之间沿深度的土层剪切波速分布模型”。然后根据目前已有钻孔深度小于 30 m 的 VS30换算公式，选择 BCV 模型为需要模型，并依据我国场地类别定义及参考实际工程钻孔资料，确定模型参数取值。最后，利用 BCV 模型得到更广义的与我国各场地类别相应的 VS30以及美国场地类别的对应关系。研究结果表明，我国各场地类别与相邻场地类别之间，其 VS30范围均出现严重的交叉、重叠现象。“在我国规范定义的计算深度到 30 m，剪切波速大于 500 m/s 的岩层不参与我国场地类别定义，但参与 VS30计算”与“等效剪切波速小且薄的覆盖土层会对 VS30范围造成大的影响”的双重影响，导致我国与以美国为代表的欧美国家关于场地类别的对应关系极为薄弱。
Abstract
Site classification is an important engineering parameter. There are obvious differences in defined site classification between Chinese and western countries’codes. Some scholars in China have studied the corresponding relationship of site classifications between Chinese and American codes， showing a certain overlapped phenomenon，but have not clearly demonstrated it. These studies are mainly based on limited numbers of drilling data，so the results tend to rely on the quantity and the site localization of the data. In this paper，the key point for site classification in China，which is the shear wave velocity distribution of soil along the calculation depth defined in the Chinese codes to 30m，is proposed firstly by comparing the Chinese and American codes. Secondly，according to the research on the formula of VS30 by using drilling data with drilling depth less than 30m，the BCV model is selected as the key model. The model parameters are determined according to the definition of site classification of Chinese codes and the field drilling data. Finally，a more generalized VS30 corresponding to Chinese site classification and the relationships between Chinese and American site classificationsare investigated and illustrated by using BCV model. The results show that there are serious overlaps of VS30 among different site classifications in Chinese codes. This demonstrates that the corresponding relationship of site classifications between Chinese and American codes is very weak. The main reasons are attributed to the contents of‘the rock layer from the calculation depth to 30m with a shear wave velocity greater than 500m/s does not contribute to the definition of site classification in Chinese codes，but is involved in the calculation of VS30’and‘the lower mean shear wave velocity within the thin overlying soil obviously changes the range of VS30’.
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references
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