本研究選取台南與北高雄都會區做為調查區,針對研究區域中已有的鑽探資料配合微振儀的量測結果,探討微振儀所量到的地層放大係數(H/V值)與地層軟硬程度(以SPT-N值為代表)的關係,並由地層共振時得的理論變位曲線(1/4之正弦曲線)與微振儀所量測到實際地層的變位曲線之關係已建立地震時地層的液化風險模式。依此模式將地層中小於1的部分加以累積求得不安全累積比(Σ(F<1)),再聯合傳統液化分析法(NCEER法)求出地層之液化潛能指數(LPI),建立本研究之液化分析法。本研究將研究區中118孔的Σ(F<1)與LPI值進行回歸求得關係式為LPI=2.4×Σ(F<1),依此關係式,本研究使用微振儀所建立的液化評估法將可求得各測點的Σ(F<1),同時根據Iwasaki的LPI的關聯性,便可定義液化潛勢之分界,低液化潛勢時Σ(F<1)值小於2;高液化潛勢時Σ(F<1)值則大於6。
In this study, the Tainan and North Kaohsiung metropolitan areas were selected as the survey area. According to the existing drilling data in the study area and the measurement results of the microtremor, discussing the relationship between amplification factor (H/V) and the SPT-N value, and establishes the safety factor model (Σ (F<1)) during the earthquake. According to this model, this study uses 1 as the boundary between liquefaction and non-liquefaction. In this study, the Σ (F<1) value and the LPI value were regressed to find the relationship LPI=2.4×Σ (F<1). According to this relationship, when the liquefaction potential is low, the value of Σ (F<1) is less than 2. When the liquefaction potential is high, the value of Σ (F<1) is greater than 6.