本文選題：二維土層效應(yīng)　切入點：地形效應(yīng)　出處：《地震學(xué)報》2017年05期 　論文類型：期刊論文

【摘要】：場地效應(yīng)通常包含土層放大效應(yīng)和地形放大效應(yīng),為了揭示二者的相對貢獻,本文構(gòu)造了平面SH波作用下部分充填沉積谷的解析模型,借助于區(qū)域分解策略,在波函數(shù)展開法的框架下,提出了超定方程組解法,得到了部分充填圓弧形沉積谷對平面SH波散射的波函數(shù)級數(shù)解,而且級數(shù)解的收斂測試表明了超定方程組解法的必要性.通過與文獻結(jié)果進行對比,驗證了本文方法的正確性.通過調(diào)整解析模型中兩個子區(qū)域內(nèi)的材料參數(shù),計算了沉積谷引起的場地放大效應(yīng)和相應(yīng)的空河谷引起的地形放大效應(yīng).對二維土層與地形效應(yīng)進行對比分析,結(jié)果顯示,在沉積谷內(nèi)二維土層放大效應(yīng)通常強于地形放大效應(yīng),而地形放大效應(yīng)決定了沉積谷外的地面運動放大形態(tài).針對最大地面運動,進行了沉積谷和相應(yīng)空河谷的參數(shù)分析,進一步描述了二維土層放大效應(yīng),研究結(jié)果表明二維土層放大效應(yīng)引起的最大地面運動通常遠遠大于地形放大效應(yīng)引起的最大地面運動,并且二維土層效應(yīng)通常隨著土層與基巖的阻抗比的增大而增大,但不是一維土層放大效應(yīng)與二維地形放大效應(yīng)的簡單線性疊加.
[Abstract]:In order to reveal their relative contribution, an analytical model of partially filling sedimentary valleys under the action of plane SH waves is constructed, which is based on the regional decomposition strategy. In the framework of wave function expansion method, a solution to overdetermined equations is proposed, and a series of wave function solutions for scattering of plane SH waves by partially filled circular arc depositional valleys are obtained. Moreover, the convergence test of the series solution shows the necessity of solving the overdetermined equations. The correctness of the method is verified by comparing with the results of the literature. The material parameters in the two sub-regions of the analytical model are adjusted. The site magnification effect caused by sedimentary valley and the terrain magnification effect caused by corresponding hollow valley are calculated. The magnification effect of two-dimensional soil layer in the sedimentary valley is usually stronger than that of the topographic amplification effect, and the topographic amplification effect determines the magnification form of the ground motion outside the sedimentary valley. The parameters of the sedimentary valley and the corresponding empty valley are analyzed for the maximum ground motion. The results show that the maximum ground motion caused by the two-dimensional soil layer amplification is much larger than the maximum ground motion caused by the topographic amplification effect. And the two-dimensional soil layer effect usually increases with the increase of the impedance ratio of the soil layer to the bedrock, but it is not a simple linear superposition of the one-dimensional soil layer amplification effect and the two-dimensional topographic amplification effect.
【作者單位】： 河海大學(xué)巖土力學(xué)與堤壩工程教育部重點實驗室;河海大學(xué)土木與交通學(xué)院巖土工程科學(xué)研究所;
【基金】：國家自然科學(xué)基金(51608172,41630638,51479050) 國家重點基礎(chǔ)研究發(fā)展計劃(973)(2015CB057901) 水利部公益性行業(yè)科研專項(201501035-03) 國家重點研發(fā)計劃項目(2016YFC0800205) 中央高�；究蒲袠I(yè)務(wù)費(2015B01214)聯(lián)合資助
【分類號】：P315.9;TU435

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本文編號：1642797