国家标准液化判别方法区域化修正初探
发布时间：2018-12-25 15:04
【摘要】：近年来国内外发生的许多地震都伴有液化现象发生,液化震害已经成为地震引起主要次生灾害,因此对液化判别方法的研究具有重要的工程意义,受到工程界高度重视。我国抗震规范依据地震场地标准贯入锤击数形成了液化判别经验公式,被工程界采纳,得到了广泛应用。但是以国内部分地区地震场地数据形成的液化判别公式在国内其他地区适用性是不确定的,2003年2月24日新疆巴楚—伽师地区发生Ms6.8级地震,地震中液化震害十分显著,从而为检验我国现行抗震规范液化判别公式准确性提供了一次机会。本文收集和整理了巴楚地震与国内典型地震场地资料,进行比较,分析巴楚地震液化特点,同时比较了各地区液化砂土标准贯入值差异。本文认为依靠标准贯入测试方法来衡量砂土抗液化能力必须考虑各地区砂土土性特点,因此国标基于标准贯入锤击数的液化判别方法有必要进行区域化修正,为此本文进行了初步探讨。本文主要工作和成果包括:1.统计新疆巴楚地震、唐山地震、海城地震、通海地震等国内典型地震液化场地数据,比较巴楚地震与国内其他地震的差异,分析结果表明巴楚地震砂土液化特点明显,表现出很强的区域其特性。2.本文依据现行的《建筑抗震设计规范》(GB50011-2010)液化判别方法对巴楚地震标贯数据进行回判分析,结果表明:抗震规范公式对巴楚地震9度区液化判别结果可以接受,但对7、8度液化地区存在严重误判,现行抗震规范液化判别公式在巴楚地区并不适用。3.通过共振柱实验,比较巴楚、唐山地区液化砂土土样剪切波速与相对密度的关系,对两地区差异进行初步分析,结果表明相对密度相同时,两地区砂土剪切波速非常接近,因此剪切波速可以较准确地反映唐山、巴楚两地区砂土的密实程度。4.比较不同地区剪切波速与标准贯入击数(Vs~N63.5)的关系,结果表明巴楚地区剪切波速与标准贯入击数经验公式与国内其他地区砂土Vs~N63.5关系差异明显,因此,以Vs~N63.5关系区分不同地区砂土动力特性初步具有可行性。5.以巴楚、唐山两地区剪切波速与标准贯入击数关系为基础,初步探讨抗震规范液化判别公式区域化修正的方法。
[Abstract]:In recent years, many earthquakes at home and abroad have been accompanied by liquefaction phenomenon, and liquefaction damage has become the main secondary disaster caused by earthquakes. Therefore, the study of liquefaction discrimination method is of great engineering significance and highly valued by engineering circles. According to the standard penetration hammering number of seismic sites, the empirical formula of liquefaction discrimination is formed in China's seismic code, which has been adopted by the engineering community and widely used. However, the applicability of liquefaction discrimination formula formed by seismic site data in some parts of China is uncertain in other parts of the country. On February 24, 2003, the Ms6.8 earthquake occurred in Bachu-Jiashi area, Xinjiang, and the liquefaction damage in the earthquake is very significant. This provides an opportunity for checking the accuracy of the liquefaction discriminant formula of the current seismic code in China. In this paper, the site data of the Bachu earthquake and the typical earthquake in China are collected and sorted out, and the liquefaction characteristics of the Bachu earthquake are analyzed, and the difference of the standard penetration value of the liquefaction sand in different regions is also compared. In this paper, it is considered that the characteristics of sand soil in different regions must be considered to measure the liquefaction resistance of sand soil by standard penetration test method. Therefore, it is necessary to carry out regionalization modification of liquefaction discrimination method based on standard penetration hammer number in national standard. Therefore, this article has carried on the preliminary discussion. The main work and achievements of this paper are as follows: 1. The liquefaction site data of typical domestic earthquakes, such as the Bachu earthquake, Tangshan earthquake, Haicheng earthquake and Tonghai earthquake in Xinjiang, are statistically analyzed, and the differences between the Bachu earthquake and other domestic earthquakes are compared. The analysis results show that the sand liquefaction characteristics of the Bachu earthquake are obvious. Show a strong area of its characteristics. 2. Based on the current liquefaction discriminant method of seismic design code for buildings (GB50011-2010), this paper analyzes back the Bachu seismic standard data. The results show that the seismic code formula is acceptable for the liquefaction discrimination of Bachu earthquake at 9 degrees. However, there is a serious misjudgment in the 7 ~ 8 degree liquefaction area, and the current seismic code liquefaction discriminant formula is not applicable in Bachu area. The relationship between shear wave velocity and relative density of liquefied sandy soil samples in Bachu and Tangshan areas is compared by resonance column experiment. The difference between the two regions is preliminarily analyzed. The results show that the shear wave velocities of sand soils in the two regions are very close when the relative density is the same. Therefore, shear wave velocity can accurately reflect the compactness of sand in Tangshan and Bachu areas. 4. The relationship between shear wave velocity and standard penetration number (Vs~N63.5) in different regions is compared. The results show that the empirical formula of shear wave velocity and standard penetration number in Bachu area is obviously different from the Vs~N63.5 relation in other parts of China. It is feasible to distinguish the dynamic characteristics of sand in different areas by Vs~N63.5 relationship. 5. Based on the relationship between shear wave velocity and standard penetration number in Bachu and Tangshan regions, the method of regionalization correction of liquefaction discriminant formula of seismic code is discussed preliminarily.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU435
本文编号：2391287
[Abstract]:In recent years, many earthquakes at home and abroad have been accompanied by liquefaction phenomenon, and liquefaction damage has become the main secondary disaster caused by earthquakes. Therefore, the study of liquefaction discrimination method is of great engineering significance and highly valued by engineering circles. According to the standard penetration hammering number of seismic sites, the empirical formula of liquefaction discrimination is formed in China's seismic code, which has been adopted by the engineering community and widely used. However, the applicability of liquefaction discrimination formula formed by seismic site data in some parts of China is uncertain in other parts of the country. On February 24, 2003, the Ms6.8 earthquake occurred in Bachu-Jiashi area, Xinjiang, and the liquefaction damage in the earthquake is very significant. This provides an opportunity for checking the accuracy of the liquefaction discriminant formula of the current seismic code in China. In this paper, the site data of the Bachu earthquake and the typical earthquake in China are collected and sorted out, and the liquefaction characteristics of the Bachu earthquake are analyzed, and the difference of the standard penetration value of the liquefaction sand in different regions is also compared. In this paper, it is considered that the characteristics of sand soil in different regions must be considered to measure the liquefaction resistance of sand soil by standard penetration test method. Therefore, it is necessary to carry out regionalization modification of liquefaction discrimination method based on standard penetration hammer number in national standard. Therefore, this article has carried on the preliminary discussion. The main work and achievements of this paper are as follows: 1. The liquefaction site data of typical domestic earthquakes, such as the Bachu earthquake, Tangshan earthquake, Haicheng earthquake and Tonghai earthquake in Xinjiang, are statistically analyzed, and the differences between the Bachu earthquake and other domestic earthquakes are compared. The analysis results show that the sand liquefaction characteristics of the Bachu earthquake are obvious. Show a strong area of its characteristics. 2. Based on the current liquefaction discriminant method of seismic design code for buildings (GB50011-2010), this paper analyzes back the Bachu seismic standard data. The results show that the seismic code formula is acceptable for the liquefaction discrimination of Bachu earthquake at 9 degrees. However, there is a serious misjudgment in the 7 ~ 8 degree liquefaction area, and the current seismic code liquefaction discriminant formula is not applicable in Bachu area. The relationship between shear wave velocity and relative density of liquefied sandy soil samples in Bachu and Tangshan areas is compared by resonance column experiment. The difference between the two regions is preliminarily analyzed. The results show that the shear wave velocities of sand soils in the two regions are very close when the relative density is the same. Therefore, shear wave velocity can accurately reflect the compactness of sand in Tangshan and Bachu areas. 4. The relationship between shear wave velocity and standard penetration number (Vs~N63.5) in different regions is compared. The results show that the empirical formula of shear wave velocity and standard penetration number in Bachu area is obviously different from the Vs~N63.5 relation in other parts of China. It is feasible to distinguish the dynamic characteristics of sand in different areas by Vs~N63.5 relationship. 5. Based on the relationship between shear wave velocity and standard penetration number in Bachu and Tangshan regions, the method of regionalization correction of liquefaction discriminant formula of seismic code is discussed preliminarily.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU435
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