摘要
文章主要针对软弱夹层抗剪强度取值所存在的争议,通过对贵州新街子滑坡的软弱夹层分别选择比例极限、屈服极限及峰值作为剪应力值,采用最小二乘法获得比例抗剪强度、屈服抗剪强度和峰值抗剪强度。以参数选取中应用较为成熟的反分析方法推求力学性质参数c、φ值作为判据对以上3种参数进行比较。计算结果表明:本滑坡软弱夹层中由于含泥量较大,而且粘塑性较强,屈服抗剪强度和反分析得到的抗剪强度偏差最小,比例抗剪强度偏差最大,峰值抗剪强度居中。并以此3种抗剪强度进行天然状态下滑坡稳定性验算,结果表明选用比例极限抗剪强度与当前滑坡的地质现象不符,选用峰值极限抗剪强度安全储备较低,而选取屈服极限抗剪强度最为合理。用此参数进行设计,滑坡已经得到了良好的治理。在取值研究中认为采用试验与反分析相结合的方法确定滑坡稳定性计算参数是比较合理的。以上结论为滑坡中软弱夹层抗剪强度取值的选择提供了重要的依据。
This paper directed chiefly against the dispute that taking value of shearing strength of weak intercalated layers,and the respectively selection proportion limit,yield limit and peak value by way of the weak intercalated layers in the Xinjiezi landslide as the shearing stress value.To use the least square law to gain the proportion shearing strength,yield shearing strength and peak value shearing strength and the mechanical parameter c and φ of shearing strength that anti-analysis yielded carry on comparison.The results indicate that the mud capacity and the visco-plastic of the weak intercalated layers is great.It is too conservative to use the proportion shearing strength,and peak value shearing strength safety margin is low.The yield shearing strength is suitable parameter for stability analyse and design.With the parameter designing,the landslide had been managed very well.And think to define the landslide stability calculation parameter is fairly more reasonable with the anti-analyse and experimentation method combined each other.The above conclusion provides the important basis that the selection of shearing strength of weak intercalated layers.
出处
《中国地质灾害与防治学报》
CSCD
2004年第4期25-29,共5页
The Chinese Journal of Geological Hazard and Control
关键词
软弱夹层
比例抗剪强度
屈服抗剪强度
峰值抗剪强度
反分析
抗剪强度取值
weak intercalated layers
proportion of shearing strength
yield of shearing strength
peak value of shearing strength
anti-analysis
least square law
