土工基础

土工基础 ›› 2023, Vol. 37 ›› Issue (4): 681-684.

• 测试技术 • 上一篇    下一篇

基于田口方法的黄土强度影响因子贡献率分析

李 娜1，李 凯2，赵晓杰3   

  1. （1.陕西省一三一煤田有限责任公司，陕西渭南 714000；2.陕西天地地质有限责任公司，西安 710054；3.西安科技大学地质与环境学院，西安 710054）
  • 收稿日期:2022-02-24 修回日期:2022-02-28 出版日期:2023-08-31 发布日期:2023-09-01
  • 作者简介:李娜(1987-)，女，工程师，研究方向为地质工程。

Contribution rate Analysis of Loess Strength Influencing Factors Using Taguchi Method

LI Na1, LI Kai2， ZHAO Xiaojie3   

  1. (1.Shan Xi 131 Coal Field Geology Co. Ltd., Weinan 714000； 2.Shan Xi Tiandi Geology Co. Ltd., Xi’an 710054； 3.School of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054)
  • Received:2022-02-24 Revised:2022-02-28 Online:2023-08-31 Published:2023-09-01

摘要： 黄土强度一直是黄土室内试验的重点内容，含水率、干密度、土体所受压力等是与黄土强度密切相关的基本要素。为明确影响因子对黄土强度影响程度，在直剪试验的测得黄土抗剪强度的基础上，采用田口法对各影响因子进行信噪比计算及方差分析。结果表明：法向压力以及干密度与信噪比值呈正相关，与含水率则为负相关；通过方差分析可知在影响非饱和黄土抗剪强度上，法向压力影响最大达到77.55%，含水率次之，干密度最低，仅为7.801%；而若考虑影响因子的交互作用，含水率与法向压力对抗剪强度影响最大可达到55.7%。对非饱和黄土而言，土体所受压力以及土体含水情况为非饱和土强度的主要影响因素，在黄土滑坡的预防方面，尽管坡角堆载以及坡顶卸压依然是预防滑坡发生的有效措施，但土体排水必须重点关注。

关键词: 抗剪强度, 田口方法, 方差分析, 贡献率

Abstract: The strength of loess soils has always been the key aspect of the loess laboratory tests. The moisture content, dry density, soil pressure and other tests are the basic testing closely related to the loess strength values. To quantify the contribution of potential influencing factors to the loess strength, Taguchi method is used to estimate the signaltonoise ratio (SNR) and analyze the variance of each influencing factor on the basis of the direct shear test. The results show that the normal pressure and the dry density are positively correlated with signaltonoise ratio, while the moisture content is negatively correlated. Through the analysis of variance, the maximum effect of the normal pressure is 77.55%, the moisture content is the second, and the lowest dry density is 7.80. Considering the interaction of influence factors, the maximum effect of the moisture content and the normal pressure on shear strength is 55.7%. On the unsaturated loess, the pressure on the soil and the moisture content of the soil are the main influencing factors of the strength of the saturated soil. In the prevention of the loess landslide, although the surcharge load at the foot of the slope and the pressure relief at the top of the slope are the effective measures to prevent the occurrence of the landslide, the drainage of the soil cannot be ignored. 

Key words: Shear Strength, Taguchi method, Analysis of Variance, Contribution Rate

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