岩石力学与工程学报
巖石力學與工程學報
암석역학여공정학보
CHINESE JOURNAL OF ROCK MECHANICS AND ENGINEERING
2013年
3期
492-500
,共9页
倪卫达%唐辉明%刘晓%吴益平
倪衛達%唐輝明%劉曉%吳益平
예위체%당휘명%류효%오익평
边坡工程%岩质边坡%震动劣化%地震荷载%动力稳定性%离散单元
邊坡工程%巖質邊坡%震動劣化%地震荷載%動力穩定性%離散單元
변파공정%암질변파%진동열화%지진하재%동력은정성%리산단원
slope engineering%rock slope%vibration deterioration%seismic loading%dynamic stability%distinct element
通过试验获取结构面震动劣化效应的数学表达式,并将之运用于岩质边坡的动力稳定性分析中.采用3DEC作为计算引擎,在每一动力计算时步内根据动力响应值实时刷新结构面的强度参数,同时由网格净节点力的矢量计算获取该时刻作用于边坡岩体上的地震惯性力.根据极限平衡理论计算该瞬时岩质边坡的稳定性系数,通过动态计算获取整个地震历时过程的稳定性系数时程曲线,以最小平均安全系数作为最终动力稳定性评价指标,从而提出一种考虑结构面震动劣化的岩质边坡动力稳定性计算方法.将该方法运用于汶川地震区岩质边坡实例研究中,稳定性分析结果与实际地质调查情况相符,验证该方法的可行性和工程实用性.
通過試驗穫取結構麵震動劣化效應的數學錶達式,併將之運用于巖質邊坡的動力穩定性分析中.採用3DEC作為計算引擎,在每一動力計算時步內根據動力響應值實時刷新結構麵的彊度參數,同時由網格淨節點力的矢量計算穫取該時刻作用于邊坡巖體上的地震慣性力.根據極限平衡理論計算該瞬時巖質邊坡的穩定性繫數,通過動態計算穫取整箇地震歷時過程的穩定性繫數時程麯線,以最小平均安全繫數作為最終動力穩定性評價指標,從而提齣一種攷慮結構麵震動劣化的巖質邊坡動力穩定性計算方法.將該方法運用于汶川地震區巖質邊坡實例研究中,穩定性分析結果與實際地質調查情況相符,驗證該方法的可行性和工程實用性.
통과시험획취결구면진동열화효응적수학표체식,병장지운용우암질변파적동력은정성분석중.채용3DEC작위계산인경,재매일동력계산시보내근거동력향응치실시쇄신결구면적강도삼수,동시유망격정절점력적시량계산획취해시각작용우변파암체상적지진관성력.근거겁한평형이론계산해순시암질변파적은정성계수,통과동태계산획취정개지진력시과정적은정성계수시정곡선,이최소평균안전계수작위최종동력은정성평개지표,종이제출일충고필결구면진동열화적암질변파동력은정성계산방법.장해방법운용우문천지진구암질변파실례연구중,은정성분석결과여실제지질조사정황상부,험증해방법적가행성화공정실용성.
@@@@Mathematical expression of vibration deterioration effect of structural plane is obtained by experiments;and then the expression is applied to rock slope′s dynamic stability analysis. 3DEC is selected as calculation engine,and at each dynamic calculation step,mechanical parameters of structural plane are refreshed according to the real-time values of dynamic response;meanwhile,the earthquake inertial force at that moment is obtained via net vectorial nodal force′s vector calculating. Hence the rock slope′s instantaneous safety factor is obtained based on the limit equilibrium theory. Therefore,the time series of factor of safety can be got for whole earthquake process by dynamic calculating;and the dynamic stability evaluation index is determined by minimum average safety factor method. Consequently a new method for analyzing dynamic stability of rock slope is presented,which takes vibration deterioration of structural plane into account. Finally,the method is used to study a rock slope case in Wenchuan earthquake-affected region;and the analytical results matched actual geological survey situation well,so as to testify the feasibility and correctness of the proposed method.