本文選題：邊坡工程　切入點：水平厚層狀巖質(zhì)邊坡　出處：《巖石力學(xué)與工程學(xué)報》2017年09期 　論文類型：期刊論文

【摘要】：基于二維顆粒流軟件(PFC2D)的人工合成巖體技術(shù),研究巖橋長度和節(jié)理間距不同組合形式下的含水平斷續(xù)節(jié)理厚層狀巖質(zhì)邊坡在地震作用下的破壞模式、動力響應(yīng)規(guī)律以及巖橋段應(yīng)力演化特征。研究結(jié)果顯示:地震動作用下,含水平斷續(xù)節(jié)理厚層狀巖質(zhì)邊坡主要發(fā)生潰散型破壞、拉裂 滑移 塊體傾倒混合破壞和拉裂 水平滑移混合破壞;水平斷續(xù)節(jié)理是控制邊坡動力穩(wěn)定性的關(guān)鍵因素。節(jié)理間距對邊坡破壞模式起控制性作用:當(dāng)節(jié)理間距較小時,易發(fā)生潰散型破壞;當(dāng)節(jié)理間距較大時,易發(fā)生拉裂 滑移 塊體傾倒破壞和拉裂 水平滑移混合破壞。巖橋長度和節(jié)理間距共同控制著邊坡巖體破碎程度,從而控制著邊坡失穩(wěn)破壞時滑動面的個數(shù),當(dāng)節(jié)理間距很小或者節(jié)理間距較大、巖橋長度較小時,發(fā)生單滑動面破壞;當(dāng)節(jié)理間距和巖橋長度均較大時,發(fā)生雙滑動面破壞。在地震動力作用下,巖橋段首先發(fā)生破壞,隨后各節(jié)理間也產(chǎn)生破壞并貫通。巖橋長度和節(jié)理間距對邊坡動力響應(yīng)均產(chǎn)生一定影響,隨著節(jié)理間距減小、巖橋長度增大,峰值位移、峰值速度增大,對加速度PGA放大系數(shù)的影響區(qū)域集中在邊坡坡表、坡腳等部位。地震作用下,含水平斷續(xù)節(jié)理厚層狀巖質(zhì)邊坡巖橋段應(yīng)力演化、裂紋萌生與輸入的地震波加速度具有良好的一致性。
[Abstract]:Based on the technology of synthetic rock mass based on two-dimensional particle flow software (PFC2D), the failure mode of thick layered rock slope with horizontal intermittent joints in different combination forms of bridge length and joint spacing under seismic action is studied. The dynamic response law and stress evolution characteristics of rock bridge section are studied. The results show that collapse failure occurs mainly in thick layered rock slope with horizontal intermittent joints under the action of ground motion. The collapse mixed failure and horizontal slip failure of the tension crack and slip block; Horizontal discontinuous joint is the key factor to control the dynamic stability of slope. The joint spacing plays a controlling role in slope failure mode: when the joint spacing is small, it is prone to collapse failure, and when the joint spacing is large, The rock bridge length and joint spacing control the degree of rock mass breakage together, thus controlling the number of sliding surfaces when the slope is unstable. When the joint spacing is small or the joint spacing is large, the single sliding plane failure occurs when the rock bridge length is small, and when the joint spacing and the rock bridge length are both large, the double sliding plane failure occurs. The rock bridge length and the joint spacing have a certain influence on the slope dynamic response. With the decrease of the joint spacing, the rock bridge length increases, the peak displacement and the peak velocity increase. The influence area of acceleration PGA magnification factor is concentrated in the side slope table, slope foot and so on. Under the earthquake, the stress evolution of thick layered rock slope with horizontal intermittent joints is obtained. The crack initiation is in good agreement with the input seismic acceleration.
【作者單位】： 中國地質(zhì)大學(xué)(武漢)工程學(xué)院;中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點實驗室;
【基金】：國家自然科學(xué)基金資助項目(51209198)~~
【分類號】：TU45

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