堰塞體形成全過程的連續(xù)離散耦合數(shù)值模擬
發(fā)布時間：2019-03-11 19:15
【摘要】：地震是觸發(fā)邊坡失穩(wěn)、滑動形成堰塞湖的重要因素,以云南魯?shù)?8·03"地震引發(fā)紅石巖滑坡為例,應(yīng)用連續(xù)-離散耦合分析方法(FDEM),模擬了三維滑坡體從變形破壞至堆積形成堰塞體的全過程。采用雙軸壓縮數(shù)值試驗率定各巖土層的FDEM模擬參數(shù),以對應(yīng)實際巖土體物理力學參數(shù)。建立了滑坡體和河谷的三維有限元模型,滑坡體部分采用較小的網(wǎng)格密度,并在實體有限單元之間插入無厚度界面單元模擬。隨著滑坡體的失穩(wěn)和滑動,失效界面單元不斷增加,導致滑坡體由連續(xù)體向非連續(xù)體轉(zhuǎn)換,并最終形成松散的堆積體。三維FDEM數(shù)值模擬表明,地震引發(fā)邊坡巖體內(nèi)部損傷和變形累積,結(jié)構(gòu)面貫通,滑坡體高速下滑并伴隨破壞、解體、撞擊對岸、堆積河道、不斷密實,形成堰塞體。最終形成的堆積體形態(tài)與現(xiàn)場情況比較接近。
[Abstract]:Earthquake is an important factor to trigger slope instability and slide to form barrier lake. Taking the red rock landslide caused by "8 路03" earthquake in Ludian, Yunnan Province as an example, the continuous-discrete coupling analysis method (FDEM),) is applied. The whole process of three-dimensional landslide body from deformation failure to accumulation to form barrier body is simulated. The FDEM simulation parameters of each rock and soil layer are determined by using the biaxial compression numerical test rate to correspond to the physical and mechanical parameters of the actual rock and soil mass. A three-dimensional finite element model of the landslide body and valley is established. The landslide body is simulated with a small mesh density and a thickness-free interface element is inserted between the solid finite elements. With the instability and sliding of the landslide, the failure interface element increases constantly, which results in the transition from continuum to discontinuity, and finally forms loose accumulations. The three-dimensional FDEM numerical simulation shows that the damage and deformation accumulated in the slope rock mass caused by the earthquake, the structure plane is connected, the landslide body declines at high speed and accompanied with the destruction, disintegrates, impacts the opposite bank, accumulates the river channel, and compacts continuously, forming the dammed body. The final formation of the accumulation body shape is close to the field situation.
【作者單位】： 武漢大學水資源與水電工程科學國家重點實驗室;武漢大學水工巖石力學教育部重點實驗室;
【基金】：國家自然科學基金面上項目(51379161) 中國博士后科學基金面上資助(2016T907272)
【分類號】：P642.2
，
本文編號：2438545
[Abstract]:Earthquake is an important factor to trigger slope instability and slide to form barrier lake. Taking the red rock landslide caused by "8 路03" earthquake in Ludian, Yunnan Province as an example, the continuous-discrete coupling analysis method (FDEM),) is applied. The whole process of three-dimensional landslide body from deformation failure to accumulation to form barrier body is simulated. The FDEM simulation parameters of each rock and soil layer are determined by using the biaxial compression numerical test rate to correspond to the physical and mechanical parameters of the actual rock and soil mass. A three-dimensional finite element model of the landslide body and valley is established. The landslide body is simulated with a small mesh density and a thickness-free interface element is inserted between the solid finite elements. With the instability and sliding of the landslide, the failure interface element increases constantly, which results in the transition from continuum to discontinuity, and finally forms loose accumulations. The three-dimensional FDEM numerical simulation shows that the damage and deformation accumulated in the slope rock mass caused by the earthquake, the structure plane is connected, the landslide body declines at high speed and accompanied with the destruction, disintegrates, impacts the opposite bank, accumulates the river channel, and compacts continuously, forming the dammed body. The final formation of the accumulation body shape is close to the field situation.
【作者單位】： 武漢大學水資源與水電工程科學國家重點實驗室;武漢大學水工巖石力學教育部重點實驗室;
【基金】：國家自然科學基金面上項目(51379161) 中國博士后科學基金面上資助(2016T907272)
【分類號】：P642.2
，
本文編號：2438545
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