1976年唐山大地震CPT液化数据库重构  

Reconstruction of the CPT-based Liquefaction Database from 1976 Tangshan Earthquake

作　　者：董林 桑志心 王蕾 夏坤 吴平川[1] Dong Lin;Sang Zhixin;Wang Lei;Xia Kun;Wu Pingchuan(College of Civil Engineering,Hebei University of Engineering,Handan 056038,Hebei,China)

机构地区：[1]河北工程大学,土木工程学院,河北邯郸056038

出　　处：《震灾防御技术》2022年第4期741-750,共10页Technology for Earthquake Disaster Prevention

基　　金：国家自然科学基金(51708525、51608496)。

摘　　要：1976年唐山大地震导致了范围广、灾害严重的液化震害。地震发生后,已有学者对液化场地进行了2次静力触探测试。本文首先给出基于2次测试数据的唐山大地震CPT液化数据库,利用中国规范方法和NCEER推荐方法对数据库进行液化判别,发现针对第1次测试数据的判别成功率较高,而针对第2次测试数据的判别成功率较低。经30年的时间,绝大多数测试点的液化层强度与埋深均发生了较大变化,第2次测试时土层液化可能性已发生了较大变化,其测试数据对液化判别方法的改进意义较小。利用第2次测试的摩阻比Rf将第1次测试数据ps分解为qc和fs,相比第2次测试数据,分解指标具有更高的可靠性。为此基于第1次测试分解数据构建唐山大地震CPT液化数据库,为液化判别方法改进提供数据支持。The 1976 Tangshan earthquake resulted in widespread liquefaction.Two single bridge probe CPT tests were conducted on these liquefied sites in 1977-1978.In this paper,CPT-based liquefaction databases from these two tests are provided firstly.The databases are then discriminated using Chinese code methods and NCEER recommended methods,liquefaction discrimination results for the first test data are good,while discrimination results for the second test data are poor.After 30 years,soil strength and depth of critical layer for most sites had changed significantly.Therefore,the liquefaction database based on second CPTU test has low reliability.The psvalues from first test are decomposed to qcand fsusing Rffrom second test,the decomposed data are discriminated also using Chinese code methods and NCEER methods,it was found that the decomposed data from first test was more reliable than the data from second test.Consequently,CPT-based liquefaction database was reconstructed by using the first test decomposed data,it can be used to provide data support for improvement of CPT liquefaction discrimination methods in the future.

关 键 词：唐山大地震 静力触探测试 液化数据库 重构 

分 类 号：TU435[建筑科学—岩土工程]