CAJ | 학술논문

鉴于1976年唐山大地震后液化调查手段及液化评价方法研究的局限性,开展液化和非液化区的现场再调查是非常有用的.采用符合国际标准的多功能地震波孔压静力触探(SCPTu)在唐山及其邻近地区进行调查试验,为场地液化再调查提供近似连续的锥尖阻力、侧壁摩阻力、孔压及剪切波速数据.通过18个试验点的SCPTu、室内试验及历史震害调查资料的综合比较,对各场地现今的液化可能性进行分析,并对国内外常用的几种液化判别方法进行分析研究.国内规范法、国际常用的Robertson确定性方法及Moss概率方法的分析结果均表明,曾经发生过液化的场地现今仍然容易发生液化;基于CPTu的Robertson确定性方法及基于贝叶斯理论的Moss概率方法各有优缺点,均有完善的计算流程,前者在液化后场地沉陷及侧向大变形预测方面具有优势,后者可以给出各试验点的液化概率,进而服务于基于概率的工程抗震评估与设计;由于 SCPTu 试验技术在国内发展缓慢,现今基于 SCPTu的几种国际常用液化评价方法在国内应用较少,也是今后在技术手段突破后急需加深研究的方向.
감우1976년당산대지진후액화조사수단급액화평개방법연구적국한성,개전액화화비액화구적현장재조사시비상유용적.채용부합국제표준적다공능지진파공압정력촉탐(SCPTu)재당산급기린근지구진행조사시험,위장지액화재조사제공근사련속적추첨조력、측벽마조력、공압급전절파속수거.통과18개시험점적SCPTu、실내시험급역사진해조사자료적종합비교,대각장지현금적액화가능성진행분석,병대국내외상용적궤충액화판별방법진행분석연구.국내규범법、국제상용적Robertson학정성방법급Moss개솔방법적분석결과균표명,증경발생과액화적장지현금잉연용역발생액화;기우CPTu적Robertson학정성방법급기우패협사이론적Moss개솔방법각유우결점,균유완선적계산류정,전자재액화후장지침함급측향대변형예측방면구유우세,후자가이급출각시험점적액화개솔,진이복무우기우개솔적공정항진평고여설계;유우 SCPTu 시험기술재국내발전완만,현금기우 SCPTu적궤충국제상용액화평개방법재국내응용교소,야시금후재기술수단돌파후급수가심연구적방향.
Due to the limitations of investigating instruments and liquefaction evaluation methods after the 1976 Tangshan earthquake,it is very useful to perform the re-investigations at liquefaction and non-liquefaction sites nowadays. The multifunctional seismic piezocone penetration test(SCPTu) method was used for this work. The nearly continuous profiles of tip resistance,sleeve friction,pore water pressure,and shear wave velocity were obtained. The liquefaction potential of testing sites was evaluated by comparing the SCPTu measurements,the indoor experiments and historical investigation data. Several popular CPTu-based liquefaction evaluation methods at home and abroad were analyzed particularly. Results from Chinese Standard method,Robertson deterministic method and Moss probabilistic method indicate that most of the testing sites that liquefied during the 1976 Tangshan earthquake will liquefy again. The CPTu-based Robertson deterministic method and the Moss probabilistic method based on Bayesian theory show respective advantages and disadvantages. Both of them have reasonably comprehensive calculation procedures. The Robertson deterministic method has special advantage in predicting vertical settlement and lateral large deformation,while the Moss probabilistic method can present the liquefaction probability for every site and serve for the seismic evaluation and engineering design. However,due to the slow development of SCPTu technique in China,kinds of current international CPTu-based liquefaction evaluation methods are seldom used,which require further study after technology have been breakthrough in future.