Experimental Study on Shear Strength of Remolded Loess by Ring Shear Test

WANG Wei; LUO Yasheng

doi:10.13961/j.cnki.stbctb.2017.05.019

您当前的位置：

首页 >

文章列表页 >

Experimental Study on Shear Strength of Remolded Loess by Ring Shear Test

- Experimental Study on Shear Strength of Remolded Loess by Ring Shear Test
- Bulletin of Soiland Water Conservation Vol. 37, Issue 5, Pages: 110-113(2017)
- 作者机构：
  
  1. 山西农业大学城乡建设学院, 山西太谷,030801
  2. 西北农林科技大学水利与建筑工程学院, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2017.05.019
  CLC：
- Published：2017
- 稿件说明：
移动端阅览
WANG Wei, LUO Yasheng. Experimental Study on Shear Strength of Remolded Loess by Ring Shear Test[J]. Bulletin of Soiland Water Conservation, 2017, 37(5): 110-113.
DOI：

WANG Wei, LUO Yasheng. Experimental Study on Shear Strength of Remolded Loess by Ring Shear Test[J]. Bulletin of Soiland Water Conservation, 2017, 37(5): 110-113. DOI： 10.13961/j.cnki.stbctb.2017.05.019.

摘要

[目的] 研究大应变条件下黄土强度的影响因素及规律，为黄土地区发生滑坡等大变形破坏提供理论依据。[方法] 利用环剪仪对重塑黄土进行大剪切位移下的剪切试验，探究不同正应力及剪切方式对不同含水率的重塑黄土其残余强度的影响。[结果] 正应力越大，残余强度越大，达到残余强度所需的剪切位移越小；随着含水率的增大，残余黏聚力浮动值不大，残余内摩擦角逐渐减小，并据此拟合出残余内摩擦角与含水率的参考公式；从脆性指数的角度得出所研究的重塑黄土的应变软化都不明显，且脆性指数随着正应力和含水率的增加而降低。[结论] 重塑黄土的峰值强度和残余强度受含水率、正应力的影响规律相似，可通过含水率对残余强度进行估算。

Abstract

[Objective] To study the influencing factors and rules of loess strength under large strain condition in order to provide a theoretical basis for large deformation damages like landslide in loess area.[Methods] Large shear displacement test with ring shear apparatus were conducted to explore the influence of positive stress and shear modes on the residual strength of remolded loess at different water content levels.[Results] The results showed that the greater the effective normal stress

the greater residual strength was

and the smaller the required shear displacement would be. The residual cohesive force fluctuated slightly and the residual internal friction angle decreased with the increase of water content

and a reference formula between residual internal friction angle and water content was fitted. From the perspective of brittle index

strain softening of the remolded loess was not obvious

and the brittleness index decreased with the increase of effective normal stress and water content.[Conclusion] The responses of the peak strength and residual strength to water content and positive stress were similar. Thus the residual strength can be estimated by water content.

关键词

Keywords

references

Skempton A W. Long-term stability of clay slopes[J]. Geotechnique, 1964,14(2):157-168.

田斌,戴会超,王世梅.滑带土结构强度特征及其强度参数取值研究[J].岩石力学与工程学报,2004,23(17):2887-2892.

谭文辉,任奋华,苗胜军.峰值强度与残余强度对边坡加固的影响研究[J].岩土力学,2007,28(S1):616-618.

Bishop A W, Green G E, Garga V K, et al. A new ring shear apparatus and its application to the measurement of residual strength[J]. Geotechnique, 1971,21(4):273-328.

Townsend F C, Gilbert P A. Tests to measure residual strengths of some clay shales[J]. Geotechnique.1973,23(2):267-271.

任惠芳.浅析滑坡土的残余强度[J].青海地质,1995(2):70-74.

戴福初,王思敬,李焯芬.香港大屿山残坡积土的残余强度试验研究[J].工程地质学报,1998,6(3):223-229.

孙涛,洪勇,栾茂田,等.采用环剪仪对超固结黏土抗剪强度特性的研究[J].岩土力学,2009,30(7):2000-2004.

张昆,郭菊彬.滑带土残余强度参数试验研究[J].铁道工程学报,2007,24(8):13-15.

周平根.滑带土强度参数的估算方法[J].水文地质工程地质,1998(6):30-32.

杨有莲,朱俊高,余挺,等.土与结构接触面力学特性环剪试验研究[J].岩土力学,2009,(11):3256-3260.

洪勇,孙涛,栾茂田,等.土工环剪仪的开发及其应用研究现状[J].岩土力学,2009,30(3):628-634.

吴迪,简文彬,徐超.残积土抗剪强度的环剪试验研究[J].岩土力学,2011,32(7):2045-2050.

廖建民,吴益平,欧光照,等.采用环剪仪对滑带土抗剪强度特性的研究[J].武汉理工大学学报,2013,35(10):92-95.

王顺,项伟,崔德山,等.不同环剪方式下滑带土残余强度试验研究[J].岩土力学,2012,33(10):2967-2972.

Bishop A W. Progressive failure with special reference to the mechanism eausing it[C]//Proceedings of the Geotechnieal Conference on the Shear Strength of Natural Soils and Pocks. Oslo:Norwegian Geothchnical Institute, 1967:142-150.

Views

1151

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Effect of Different Ring Shear Tests on Residual Strength of Remolded Loess

Impact of digital economy on value conversion efficiency of agricultural ecological products in Yangtze River economic belt

Construction of ecological security pattern at Zhangjiakou section of Bashang region based on landscape connectivity optimization

Impacts of seasonal drought on carbon-water coupling mechanism in China’s terrestrial ecosystems

Research progress on microbial-biochar interaction mechanisms in saline-alkali soil improvement

Related Author

LUO Yasheng

Related Institution

No data

⁰