基于滑体自重效应的滑带土强度参数取值方法

doi:10.13722/j.cnki.jrme.2021.0314

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摘要滑带土强度参数的准确取值对于滑坡稳定性评价及抗滑措施设计具有重要的工程意义和经济价值。以黄河上游戈龙布特大堵江溃决型滑坡为例，采用野外调查、物理指标试验、固结试验、快剪试验、数值计算、相关性分析等技术方法，通过正应力p‐孔隙比e‐含水量w‐抗剪强度参数c，f链式分析，获得不同地段滑带土的抗剪强度参数，并分别计算其平均值、整体值和标准值。研究结果表明：正应力p与孔隙比e、含水量w与抗剪强度参数c，f之间具有较好的相关性，相关性系数均在0.9以上。最后，基于工程安全角度，综合分析得到用于工程设计、施工的抗剪强度参数建议值。该方法能在一定程度上考虑滑带土原位赋存环境效应，有效克服滑带土传统剪切试验结果的离散性。

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	周洪福1
	张卓婷2
	韦玉婷3

关键词 ：土力学, 滑坡, 滑带土, 抗剪强度参数, 取值方法

Abstract：Accurately determining the strength parameters of the sliding zone soil is of great value to the stability evaluation and the landslide treatment of a slope. In this paper，the Gelongbu landslide in the upper reaches of the Yellow River is taken as an example to evaluate the accurate strength parameters. The measures include the field survey，physical parameter test，consolidation test，shear test，numerical calculation and correlation analysis. The shear strength values of the sliding zone soils at different positions were obtained from the relationships between the normal pressure(p) and the void ratio(e)，between the void ratio(e) and the water content(w)，and between the water content(w) and the shear strength parameters(c， f ). The average values，overall values and standard values of the shear strengths were calculated，respectively. The results show that there are good correlations between P and e as well as w and(c，f )，and the correlation coefficients are larger than 0.9. In the sight of engineering safety，the recommended values of the shear strength parameters for engineering design and construction were obtained. The present method for determining the shear strength parameters of the sliding zone soil of a slope can reflect the in-suit environment effect and can avoid the dispersion of the shear strength parameters obtained by the traditional shear test.

Key words： soil mechanics landslide sliding-zone soil parameter of shear strength valuation method

引用本文:

周洪福1，张卓婷2，韦玉婷3. 基于滑体自重效应的滑带土强度参数取值方法[J]. 岩石力学与工程学报, 2022, 41(5): 1045-1053.
ZHOU Hongfu1，ZHANG Zhuoting2，WEI Yuting3. Method for determining shear strength parameters of sliding-zone soils considering weight effect of landslides. , 2022, 41(5): 1045-1053.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0314 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I5/1045

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