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边坡渐进破坏双折减系数法的机理分析 预览 被引量:37

Mechanism Analysis on Dual Reduction Factors about the Progressive Failure of Slope
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摘要 边坡的破坏是一个渐进累积破坏过程,由于含水量变化以及应变的累积,土体的强度参数c,φ以不同速度发生衰减,从而形成剪切带,随着剪切带的不断延伸,最终导致边坡整体失稳;同时,边坡稳定与否是c,φ共同作用的结果,但是在边坡发生滑动时,粘聚力首先发挥作用,随着应变增加,内摩擦角才逐渐发挥作用,因此,c,φ应有不同的安全储备。作者对土体的强度衰减特性及c,φ的作用机理进行了分析,根据土体c,φ的不同衰减速度和作用机理,提出了在边坡稳定性分析中采用c的折减系数大于φ的折减系数的双折减系数法,提出此配套折减方法供大家讨论,以逐渐形成共识。 Slope destruction is a progressive process. Because of the change of water content and strain accumulation, different decay rate of the shear strength parameters c and φ the shear bands were formed. As the shear bands expanded, at last overall instability was happened in the slope. Stability or instability of slope is the result of joint effect of shear strength parameters c and φ . When the slope slides, the cohesive force c reacts first, then gradually the internal friction angle φ follows. So the safety margin is different for c and φ. The strength attenuating characteristic of the soil and mechanism of c and φ are analyzed in this paper. According to the different decay rate ofc and φ. a mode with the reduction factor of cohesive c bigger than internal friction angle φ was put forward. The mode put forward in this paper, is for discussion and gradually to form a common knowledge.
作者 唐芬 郑颖人 TANG Fen, ZHENG Ying-ren( 1. Department of Military Construction Engineering, Logistic Engineering University, Chongqing 400041, China; 2. Chongqing Communications University, Chongqing 400042 , China)
出处 《地下空间与工程学报》 CSCD 2008年第3期 436-441,464,共7页 Chinese Journal of Underground Space and Engineering
关键词 衰减 物理机制 应变软化 力学机制 双折减系数 decay physical mechanism strain - soften mechanism dual reduction factors
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