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
2014年
4期
729-736
,共8页
边坡工程%顺层岩体边坡%动力%离心机模型试验%正交次级节理
邊坡工程%順層巖體邊坡%動力%離心機模型試驗%正交次級節理
변파공정%순층암체변파%동력%리심궤모형시험%정교차급절리
slope engineering%bedding rock slope%dynamic failure%centrifuge modelling test%secondary rock joint
使用相似材料分别制作只含有非连续的层面和同时含有非连续的层面和非贯通的次级节理顺层岩体边坡小比例物理模型,进行离心机动力试验,研究边坡的动力响应和破坏机制以及非连续层面和次级节理对其的影响。试验结果证明:顺层边坡的动力响应对地震波的频率和边坡内部结构面的发育特征敏感,边坡结构面发育越复杂,边坡对地震波的频率响应越复杂,地形放大效应也越明显;顺层边坡的动力稳定性和破坏机制受结构面发育特征控制,含有次级节理的边坡动力稳定性更低,破坏范围也更浅,在破坏过程中还会出现次级节理的张拉破坏导致的岩体内部解体破碎,可能诱发岩石碎屑流。
使用相似材料分彆製作隻含有非連續的層麵和同時含有非連續的層麵和非貫通的次級節理順層巖體邊坡小比例物理模型,進行離心機動力試驗,研究邊坡的動力響應和破壞機製以及非連續層麵和次級節理對其的影響。試驗結果證明:順層邊坡的動力響應對地震波的頻率和邊坡內部結構麵的髮育特徵敏感,邊坡結構麵髮育越複雜,邊坡對地震波的頻率響應越複雜,地形放大效應也越明顯;順層邊坡的動力穩定性和破壞機製受結構麵髮育特徵控製,含有次級節理的邊坡動力穩定性更低,破壞範圍也更淺,在破壞過程中還會齣現次級節理的張拉破壞導緻的巖體內部解體破碎,可能誘髮巖石碎屑流。
사용상사재료분별제작지함유비련속적층면화동시함유비련속적층면화비관통적차급절리순층암체변파소비례물리모형,진행리심궤동력시험,연구변파적동력향응화파배궤제이급비련속층면화차급절리대기적영향。시험결과증명:순층변파적동력향응대지진파적빈솔화변파내부결구면적발육특정민감,변파결구면발육월복잡,변파대지진파적빈솔향응월복잡,지형방대효응야월명현;순층변파적동력은정성화파배궤제수결구면발육특정공제,함유차급절리적변파동력은정성경저,파배범위야경천,재파배과정중환회출현차급절리적장랍파배도치적암체내부해체파쇄,가능유발암석쇄설류。
Two types of physical models of sliding rock slope,one with the intermittent rock planes alone and the other with both the rock planes and secondary rock joints were built using similar materials,and tested in the centrifuge machine under different seismic loads. The dynamic response and failure mechanism of the two slope models were then recorded and analyzed. The test results revealed that the dynamic response of the sliding rock slope was sensitive to the frequency of input seismic load and the characteristics of the joint structure inside. The more complex the joint structures are,the more complex the response to the input load frequency and the greater the topographic amplification effect. The dynamic stability and failure mechanism is strongly affected by the joint structure characteristics of the rock slope mass. The rock slope model with both intermittent rock bedding planes secondary rock joints has the lower dynamic stability and a shallower failure plane than the model with only the bedding planes. The tensile failures of the secondary rock joints during the dynamic failing process give rise to the internal crash and lead to the rock debris flow.