【摘要】：近年來國內(nèi)外發(fā)生的許多地震都伴有液化現(xiàn)象發(fā)生,液化震害已經(jīng)成為地震引起主要次生災(zāi)害,因此對液化判別方法的研究具有重要的工程意義,受到工程界高度重視。我國抗震規(guī)范依據(jù)地震場地標(biāo)準(zhǔn)貫入錘擊數(shù)形成了液化判別經(jīng)驗(yàn)公式,被工程界采納,得到了廣泛應(yīng)用。但是以國內(nèi)部分地區(qū)地震場地?cái)?shù)據(jù)形成的液化判別公式在國內(nèi)其他地區(qū)適用性是不確定的,2003年2月24日新疆巴楚—伽師地區(qū)發(fā)生Ms6.8級地震,地震中液化震害十分顯著,從而為檢驗(yàn)我國現(xiàn)行抗震規(guī)范液化判別公式準(zhǔn)確性提供了一次機(jī)會。本文收集和整理了巴楚地震與國內(nèi)典型地震場地資料,進(jìn)行比較,分析巴楚地震液化特點(diǎn),同時(shí)比較了各地區(qū)液化砂土標(biāo)準(zhǔn)貫入值差異。本文認(rèn)為依靠標(biāo)準(zhǔn)貫入測試方法來衡量砂土抗液化能力必須考慮各地區(qū)砂土土性特點(diǎn),因此國標(biāo)基于標(biāo)準(zhǔn)貫入錘擊數(shù)的液化判別方法有必要進(jìn)行區(qū)域化修正,為此本文進(jìn)行了初步探討。本文主要工作和成果包括:1.統(tǒng)計(jì)新疆巴楚地震、唐山地震、海城地震、通海地震等國內(nèi)典型地震液化場地?cái)?shù)據(jù),比較巴楚地震與國內(nèi)其他地震的差異,分析結(jié)果表明巴楚地震砂土液化特點(diǎn)明顯,表現(xiàn)出很強(qiáng)的區(qū)域其特性。2.本文依據(jù)現(xiàn)行的《建筑抗震設(shè)計(jì)規(guī)范》(GB50011-2010)液化判別方法對巴楚地震標(biāo)貫數(shù)據(jù)進(jìn)行回判分析,結(jié)果表明:抗震規(guī)范公式對巴楚地震9度區(qū)液化判別結(jié)果可以接受,但對7、8度液化地區(qū)存在嚴(yán)重誤判,現(xiàn)行抗震規(guī)范液化判別公式在巴楚地區(qū)并不適用。3.通過共振柱實(shí)驗(yàn),比較巴楚、唐山地區(qū)液化砂土土樣剪切波速與相對密度的關(guān)系,對兩地區(qū)差異進(jìn)行初步分析,結(jié)果表明相對密度相同時(shí),兩地區(qū)砂土剪切波速非常接近,因此剪切波速可以較準(zhǔn)確地反映唐山、巴楚兩地區(qū)砂土的密實(shí)程度。4.比較不同地區(qū)剪切波速與標(biāo)準(zhǔn)貫入擊數(shù)(Vs~N63.5)的關(guān)系,結(jié)果表明巴楚地區(qū)剪切波速與標(biāo)準(zhǔn)貫入擊數(shù)經(jīng)驗(yàn)公式與國內(nèi)其他地區(qū)砂土Vs~N63.5關(guān)系差異明顯,因此,以Vs~N63.5關(guān)系區(qū)分不同地區(qū)砂土動力特性初步具有可行性。5.以巴楚、唐山兩地區(qū)剪切波速與標(biāo)準(zhǔn)貫入擊數(shù)關(guān)系為基礎(chǔ),初步探討抗震規(guī)范液化判別公式區(qū)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.
【學(xué)位授予單位】：中國地震局工程力學(xué)研究所
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU435

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