本文選題：黃土 + 震陷�。� 參考：《中國地震局蘭州地震研究所》2017年碩士論文

【摘要】：黃土震陷是地震作用下黃土的大孔隙結(jié)構(gòu)產(chǎn)生崩潰性破壞而引發(fā)的地震災(zāi)害,具體表現(xiàn)為地面塌陷和黃土滑坡等。歷史上因強(qiáng)烈地震引發(fā)的黃土震陷災(zāi)害帶來了生命和財(cái)產(chǎn)的極大損失。黃土震陷問題已經(jīng)引起了人們的重視,目前評(píng)價(jià)黃土震陷的方法主要是室內(nèi)實(shí)驗(yàn)測試不同深度的震陷系數(shù),利用分層總和法計(jì)算震陷量。本文在前人研究的基礎(chǔ)上,通過對蘭州新區(qū)及周邊地區(qū)大量剪切波速、含水率和震陷實(shí)驗(yàn)資料的統(tǒng)計(jì)分析,給出了利用剪切波速和含水率雙指標(biāo)評(píng)價(jià)黃土震陷的方法。通過研究,本論文取得了以下幾方面結(jié)論:1.選取了剪切波速和含水率兩個(gè)獨(dú)立的參數(shù)組成評(píng)價(jià)震陷的參數(shù)體系,分析了剪切波速和含水率與震陷系數(shù)的關(guān)系。在一定含水率條件下,隨著剪切波速的增大震陷系數(shù)減小。在一定剪切波速情況下,隨著含水率的增大震陷系數(shù)增大;并且剪切波速越大,隨著含水率的增大震陷系數(shù)增長的越緩慢。2.分析了剪切波速和含水率在震陷過程中的相互關(guān)系,提出天然震陷能力的概念。通過分析二者與震陷系數(shù)的關(guān)系,得出剪切波速反映著非飽和土體的強(qiáng)度特征和絕對變形量及含水率影響非飽和土體的強(qiáng)度特征和絕對變形量的釋放的觀點(diǎn)。在此基礎(chǔ)上,提出表征黃土潛在震陷能力的概念—天然震陷系數(shù),其與剪切波速呈正相關(guān),含水率對天然震陷系數(shù)影響較小,但含水率對震陷過程的完成有著明顯的影響。3.在預(yù)測黃土震陷方面,通過剪切波速擬合公式和含水率擬合公式得到兩個(gè)震陷系數(shù),通過對兩個(gè)系數(shù)進(jìn)行比較后,得出場地的實(shí)際震陷系數(shù),再進(jìn)行黃土場地震陷量的預(yù)測。在這種方法的指導(dǎo)下,可能存在兩種工況:第一種工況,當(dāng)由含水率擬合公式計(jì)算得到的震陷系數(shù)小于天然震陷系數(shù),此時(shí)黃土的潛在震陷能力沒有得到完全釋放,實(shí)際震陷系數(shù)由含水量擬合公式計(jì)算。第二種工況,當(dāng)依據(jù)含水率擬合公式計(jì)算得到的震陷系數(shù)大于天然震陷系數(shù),此時(shí)黃土的潛在震陷能力得到完全釋放,實(shí)際震陷系數(shù)由剪切波速擬合公式計(jì)算,即天然震陷系數(shù)。4.利用剪切波速和含水率雙指標(biāo)對蘭州新區(qū)黃土震陷特性進(jìn)行了評(píng)價(jià),并與室內(nèi)震陷試驗(yàn)結(jié)果對比驗(yàn)證。結(jié)果表明,預(yù)測結(jié)果與室內(nèi)震陷試驗(yàn)預(yù)測結(jié)果基本相符。本論文的研究成果為黃土震陷評(píng)價(jià)提供了較好的思路,具有較大的工程意義。
[Abstract]:Loess earthquake subsidence is a kind of earthquake disaster caused by the collapse of the pore structure of loess caused by earthquake, which is manifested as ground collapse and loess landslide. In history, great losses of life and property were caused by the earthquake subsidence disaster of loess caused by strong earthquake. People have paid more attention to the problem of loess seismic subsidence. At present, the evaluation method of loess seismic subsidence is mainly to test the seismic subsidence coefficient of different depth through laboratory experiments, and to calculate the seismic subsidence by using the method of stratified summation. On the basis of previous studies, this paper presents a method for evaluating loess seismic subsidence by means of statistical analysis of a large number of shear wave velocity, water content and seismic subsidence experimental data in Lanzhou New area and its surrounding area. Through the research, this paper has obtained the following several aspects of conclusion: 1. Two independent parameters of shear wave velocity and water content are selected to evaluate seismic subsidence. The relationship between shear wave velocity and water content and seismic subsidence coefficient is analyzed. Under certain water content, the seismic trapping coefficient decreases with the increase of shear wave velocity. In the case of certain shear wave velocity, the seismic trapping coefficient increases with the increase of water content, and the larger the shear wave velocity, the slower the seismic trapping coefficient increases with the increase of water content. The relationship between shear wave velocity and water content in the process of seismic subsidence is analyzed, and the concept of natural seismic trapping ability is put forward. By analyzing the relationship between the shear wave velocity and the seismic subsidence coefficient, it is concluded that the shear wave velocity reflects the strength characteristics of unsaturated soil and the effect of absolute deformation and moisture content on the strength characteristics and release of absolute deformation of unsaturated soil. On this basis, the concept of natural seismic subsidence coefficient, which represents the potential seismic subsidence ability of loess, is put forward, which is positively related to shear wave velocity, and water content has little effect on natural seismic subsidence coefficient, but water content has obvious influence on the completion of seismic subsidence process. In the aspect of predicting loess seismic subsidence, two seismic subsidence coefficients are obtained by shear wave velocity fitting formula and water content fitting formula. After comparing the two coefficients, the actual seismic subsidence coefficient of the site is obtained, and then the earthquake subsidence of loess field is predicted. Under the guidance of this method, there may be two conditions: first, when the seismic subsidence coefficient calculated by the water content fitting formula is less than that of the natural seismic subsidence coefficient, the potential seismic subsidence capacity of loess is not completely released. The actual seismic subsidence coefficient is calculated by the fitting formula of water content. In the second case, when the seismic subsidence coefficient calculated by water content fitting formula is larger than that of natural seismic subsidence coefficient, the potential seismic subsidence capacity of loess is completely released, and the actual seismic subsidence coefficient is calculated by shear wave velocity fitting formula. That is, natural seismic subsidence coefficient. The seismic subsidence characteristics of loess in Lanzhou New area were evaluated by using the double indexes of shear wave velocity and water content, and the results were compared with the results of indoor seismic subsidence test. The results show that the predicted results are in good agreement with the results of indoor seismic subsidence test. The research results of this paper provide a good idea for evaluation of loess seismic subsidence and have great engineering significance.
【學(xué)位授予單位】：中國地震局蘭州地震研究所
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU444;TU435

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本文編號(hào)：1922130