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首页> 外文期刊>KSCE journal of civil engineering >Study on Tensile Strength and Tensile-Shear Coupling Mechanism of Loess around Lanzhou and Yanan City in China by Unconfined Penetration Test
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Study on Tensile Strength and Tensile-Shear Coupling Mechanism of Loess around Lanzhou and Yanan City in China by Unconfined Penetration Test

机译：兰州-延安市黄土抗拉强度与拉剪力耦合机制的无边渗透试验研究

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摘要

Tensile strength is an important but seldom noticed parameter that reveals the constitutive relations of soil. For the loess, the tensile strength can be used to explain earthwork-induced damages such as tension cracks in cut slopes and corresponding slope failures, or natural disasters such as ground fissures. The present study chose an indirect method, particularly the unconfined penetration (UP) test, to measure the tensile strength of remolded loess and undisturbed Q2 and Q3 loess obtained from different districts in China. The results indicated that the tensile strength of the undisturbed loess was primary determined by the void ratio. In addition, multiple correlations were observed between the void ratio and the degree of saturation. The tensile linear stiffness exhibited an exponential increase following an increase in the tensile strength. The mechanism of the tensile-shear coupling strength criterion was proposed. Linear relations between the mechanical parameters were deduced under the tensile-shear coupling condition and were verified by the remolded and undisturbed loess, respectively. Both the unconfined compressive strength and cohesion decreased under the tensile-shear coupling condition. Comparisons with other strength models validated the suitability of the tensile-shear coupling strength criterion for the loess. This study aims to present a more comprehensive understanding on the tensile strength of loess and offer parameter guidance for stability calculations in practical engineering.
机译：拉伸强度是一个重要但鲜为人知的参数，它揭示了土壤的本构关系。对于黄土，抗张强度可以用来解释土方引起的破坏，例如切坡中的张裂裂缝和相应的边坡破坏，或自然灾害，例如地面裂缝。本研究选择了一种间接方法，特别是无限制渗透（UP）试验，来测量从中国不同地区获得的重塑黄土以及未扰动的Q2和Q3黄土的拉伸强度。结果表明，原状黄土的抗张强度主要取决于空隙率。另外，在空隙率和饱和度之间观察到多种相关性。随着拉伸强度的增加，拉伸线性刚度表现出指数增加。提出了拉剪力强度准则的机理。在拉剪耦合条件下推导了力学参数之间的线性关系，并分别通过重塑和未扰动的黄土进行了验证。在拉伸-剪切耦合条件下，无侧限抗压强度和内聚力均降低。与其他强度模型的比较验证了黄土的拉剪力耦合强度准则的适用性。这项研究旨在对黄土的抗张强度进行更全面的了解，并为实际工程中的稳定性计算提供参数指导。

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