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馬萬(wàn)榮，劉淵，劉祥

（ 廣西路橋工程集團(tuán)有限公司，廣西 南寧 530200)

摘 要：為探究基覆型邊坡的動(dòng)力響應(yīng)特性、破壞模式以及基覆界面傾角的影響， 以西南山區(qū)某基覆型邊坡為原型，利用FLAC3D軟件模擬基覆型邊坡在地震作用下的響應(yīng)過(guò)程，分析不同地震作用下邊坡的動(dòng)力響應(yīng)及破壞模式，在此基礎(chǔ)上進(jìn)一步改變基覆界面的上、下界面傾角，分析基覆界面傾角對(duì)動(dòng)力響應(yīng)特性及破壞模式的影響。結(jié)果表明：基覆型邊坡的PGA放大系數(shù)沿坡表方向隨高程增大先增大后減小，坡體內(nèi)部的動(dòng)力響應(yīng)呈現(xiàn)明顯的高程效應(yīng)和趨表效應(yīng)規(guī)律，且隨著輸入PGA增大而減小；在地震作用下邊坡沿上覆土體內(nèi)部形成的潛在滑動(dòng)面發(fā)生剪切破壞，加載PGA=0. 6g的EL波和Kobe波時(shí)，坡表的最大位移分別為228.1cm和446.2cm, 加載Kobe波時(shí)模型的加速度響應(yīng)與位移響應(yīng)均要比加載EL波時(shí)更激烈；基覆界面傾角對(duì)動(dòng)力響應(yīng)特性及破壞模式有著顯著影響，當(dāng)上界面傾角增大時(shí)，坡表處動(dòng)力響應(yīng)程度有所增強(qiáng)，而下界面傾角增大時(shí)， 坡表處動(dòng)力響應(yīng)程度有一定減弱，邊坡破壞模式隨著上下界面傾角差值增大由整體滑移破壞逐漸轉(zhuǎn)變?yōu)榫植炕?移破壞，上下界面傾角差值越大，邊坡穩(wěn)定性越高。

關(guān)鍵詞：基覆型邊坡；地震作用；數(shù)值計(jì)算；動(dòng)力響應(yīng)；破壞模式；界面傾角

中圖分類號(hào)：U213.1+3 文獻(xiàn)標(biāo)志碼：A

文章編號(hào)：1005-8249(2024)03-0079-07

DOI：10. 19860/j.cnki.issn1005 - 8249.2024.03 .016

MA Wanrong , LIU Yuan , LIU Xiang

(Guangxi Road and Bridge Engineering Group Co. ，Ltd. ，Nanning 530200 , China)

Abstract : In order to investigate the dynamic response characteristics , damage modes and the influence of base - cover interface inclination angle of a base - cover slope in the southwest mountainous area , FLAC 3D software is used to simulate the response process of base - cover slope under seismic action , and to analyze the dynamic response and damage modes of the slope under different seismic actions , and then to further change the inclination angle of the base - cover interface , and to analyze the effect of the inclination angle on the dynamic response characteristics and the damage modes. On this basis , we further change the inclination angle of the upper and lower interfaces of the base - cover interface to analyze the influence of the inclination angle of the base - cover interface on the dynamic response characteristics and damage mode. The results show that the PGA amplification coefficient of the slope of bedrock and overburden layer increases and then decreases with the increase of ELevation , and the dynamic response of the internal slope body shows a clear pattern of ELevation effect and surface effect , and decreases with the increase of input PGA. The maximum displacement of the slope surface is 228. 1 cm and 446. 2 cm when loading EL and Kobe waves with PGA = 0. 6g. The accELeration response and displacement response of the model are more intense when loading Kobe waves than when loading EL waves. The slope damage mode gradually changes from overall slip damage to local slip damage as the difference between the upper and lower interface inclination increases , the slope failure mode gradually transitions from overall slip failure to local slip failure , and the greater the difference , the higher the slope stability.

Keywords : the slope of bedrock and overburden layer; earthquake; numerical calculation; dynamic response; failure mode; interface dip

作者簡(jiǎn)介： 馬萬(wàn)榮 (1973—) , 男 ，本科 ，高級(jí)工程師 ，研究方向：公路工程相關(guān)施工管理。

通信作者：劉 祥 (1991 —) , 男 ，博士 ，高級(jí)工程師 ，研究方向： 結(jié)構(gòu)工程 、抗震減災(zāi)以及項(xiàng)目施工管理。

收稿日期：2023- 10- 19