Stability of tunnel face in unsaturated sand possessing apparent cohesion: A micro-macro analytical approach

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2023-11-06 DOI:10.1016/j.sandf.2023.101396
Junzuo He , Shaoming Liao , Mengbo Liu , Iwanami Motoi , Junhua Xiao
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Abstract

Although the stability of tunnel face in the dry and saturated sandy ground is widely studied, the unsaturated sandy ground which possesses apparent cohesion is more common in engineering. For remedying this deficiency, the theoretical association between apparent cohesion and the saturation degree is firstly established in microscopic prospective. Then, the formation mechanism of the self-stabilized arch and the limit support pressure (LSP) of the tunnel face are derived by incorporating apparent cohesion into the macroscopic limit equilibrium analysis of the multi-arches model. Subsequently, the validities of the proposed approach in estimating apparent cohesion, loosening zone height and LSP are well confirmed (the average error rates of LSP are within 12 %) via comparisons with direct shear tests, model tests and other existing methods. Finally, as revealed by the parametric discussion, under the effect of apparent cohesion, LSP is negatively correlated with compactness, internal friction angle, and contact angle while decreases firstly (to a minimum value of 0.09γD ∼ 0.15γD) and then increase with the rise of saturation degree. Besides, the LSP has a parabolic distribution along the depth with its peak value emerges between 0.3D and 0.45D.

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具有表观黏聚力的非饱和砂土隧道工作面稳定性:一种微观宏观分析方法
虽然对干饱和砂土条件下隧道工作面稳定性的研究较多,但具有明显黏聚力的非饱和砂土在工程中更为常见。为了弥补这一不足,首先从微观角度建立了视黏聚力与饱和度之间的理论联系。然后,将视黏聚力纳入多拱模型的宏观极限平衡分析,推导出自稳拱的形成机理和巷道工作面极限支护压力;随后,通过与直剪试验、模型试验等现有方法的比较,验证了该方法在估计表观黏聚力、松动区高度和LSP方面的有效性(LSP的平均错误率在12%以内)。最后,由参数讨论可知,在表观黏聚力的作用下,LSP与密实度、内摩擦角和接触角呈负相关,随着饱和度的升高,LSP先减小(最小值为0.09γD ~ 0.15γD),后增大。LSP沿深度呈抛物线型分布,峰值出现在0.3 ~ 0.45D之间。
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来源期刊
Soils and Foundations
Soils and Foundations 工程技术-地球科学综合
CiteScore
6.40
自引率
8.10%
发文量
99
审稿时长
5 months
期刊介绍: Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.
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