基于参数劣化的软硬相间顺层边坡稳定性研究

›› 2014, Vol. 35 ›› Issue (S1): 195-202.

基于参数劣化的软硬相间顺层边坡稳定性研究

梁德明，李长冬，雍睿，王姣，胡斌

中国地质大学工程学院，武汉 430074

收稿日期:2013-09-14 出版日期:2014-06-10 发布日期:2014-06-20
通讯作者: 李长冬，男，1981年生，博士，副教授，主要从事岩土体稳定性评价与地质灾害防治方法研究。E-mail: lichangdong@cug.edu.cn E-mail:liangdeming2012@163.com
作者简介:梁德明，男，1986年生，硕士研究生，主要从事地质灾害预测预报及边坡稳定性评价方面的研究
基金资助:
国家自然科学基金资助(No. 41202198，No. 41172281)；中央高校基本科研业务费专项资金“摇篮计划”资助(No. CUG130409，No. CUGL100413)；国家重点基础研究发展计划“973”项目资助(No. 2011CB710604)；中国地质大学实验室开放基金资助(No. SKG2012141)。

Study of stability of soft-hard interbedded slope based on degradation of strength parameters

LIANG De-ming，LI Chang-dong，YONG Rui，WANG Jiao，HU Bin

Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

Received:2013-09-14 Online:2014-06-10 Published:2014-06-20

摘要/Abstract

摘要： 三峡库区侏罗系地层具有独特的软硬相间的岩性组合和结构特征，侏罗系砂泥岩软硬相间地层是该地区典型的易滑地层，是滑坡集中发育的地层之一，也是三峡库区滑坡防治工作中的重点区域。为深入研究软硬相间层状岩质边坡的稳定性，通过对理论概化模型的分析，构建了软硬相间顺层岩质边坡的参数劣化计算模型。考虑风化作用对岩体结构面抗剪强度参数劣化的影响，引入空间变异函数，提出软硬相间层状岩质边坡结构面抗剪强度参数劣化模型，导出软硬相间层状岩质边坡沿层面方向抗剪强度参数劣化的函数表达式，表征了分析点的风化影响厚度与其强度参数的一一对应关系，有利于边坡稳定性的定量分析。利用该函数表达式对沿层面方向岩体的强度参数进行劣化，利用劣化后的强度参数进行稳定性评价，得到分析点至坡面距离与该点稳定系数的对应关系曲线，并结合三峡库区边坡实例进行了验证分析，指出软硬相间层状岩质边坡岩体抗剪强度参数的劣化对其稳定性评价具有较大影响，单平面滑动的稳定分析中抗剪强度参数沿层面恒定分布的假定具有一定的局限性；若不考虑结构面抗剪强度参数的劣化，可能导致稳定性计算结果偏于不安全。

关键词: 岩质边坡, 稳定性评价, 软硬相间地层, 变异函数, 参数劣化

Abstract: The Jurassic sand-mudstone alternating stratum is one of typical sliding-prone layers in Three Gorges Reservoir region, where the landslides occur with high frequency. Due to this characteristic lithology combination and architectural feature, the stratum is one key area of landslide control in Three Gorges Reservoir region. In order to further study the stability of rock slope with soft-hard alternating layers, the paper presents a new calculation model of soft-hard interbedding rock slope by means of the analysis on an idealized model. Besides, a shear strength parameter degradation model of soft-hard interbedded rock slope is proposed with considering the effect of weathering for shear strength parameter degradation of the discontinuity plane and a space variation function. Moreover, function expression of shear strength parameter degradation is educed along surface of the layer. The function presented the relationship between weathering thickness and strength parameters, which was in favour of the quantitative analysis of slope stability. Then, utilizing this function weakened the shear strength parameters along surface, evaluating slope stability with the weakened parameters, obtaining the relation curve of stability coefficient and distance from the analyzed point to slope surface. Finally, it is proved that the shear strength parameter degradation of the discontinuity plane of soft-hard interbedded rock slope is significant to its stability assessment with slope case study in Three Gorges Reservoir region. It is concluded that the assumption that shear strength parameters remain constant distribution along layer surface has certain limitation in the stability analysis of single sliding surface slope. Moreover, if the degradation of shear strength parameters of structural planes is not under consideration, it may lead to the result of stability calculation unsafe.

Key words: rock slope, stability evaluation, soft-hard interbedding strata, variation function, degradation of parameters

中图分类号:

TU 452

梁德明，李长冬，雍睿，王姣，胡斌. 基于参数劣化的软硬相间顺层边坡稳定性研究[J]. , 2014, 35(S1): 195-202.

LIANG De-ming，LI Chang-dong，YONG Rui，WANG Jiao，HU Bin. Study of stability of soft-hard interbedded slope based on degradation of strength parameters[J]. , 2014, 35(S1): 195-202.

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