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彭   軍

 

（福建省水文地質工程地質勘察研究院 ，漳州 363000)

摘   要 ：顆粒形狀是砂礫石土力學性質主要影響因素之一。為揭示顆粒形狀對循環荷載作用下砂礫石土力  學性質影響規律和機理 ，采用顆粒流離散元方法對砂礫石土的循環剪切試驗進行仿真。通過對比試驗，將顆粒形狀影響因子單獨分離，獲取顆粒形狀對砂礫石土宏細觀力學響應的影響。結果表明： 在給定的循環荷載作用下 ，顆粒形狀對平均動模量和臨界摩擦角基本無影響，顆粒形狀的不規則性會導致峰值摩擦角降低；顆粒形狀對剪切模量基本無影響，但不規則的顆粒形狀會使最大剪脹角有一定程度的降低；不規則的顆粒形狀會使循環  荷載作用下 e - p 臨界狀態線的斜率變大 、截距變小；在細觀層面，均一化后的接觸密度不受顆粒形狀的影響，均一化的接觸力分布不受顆粒形狀的影響，接觸力異向性不受顆粒形狀的影響。研究結果可對鐵路路堤以及土 石壩的填料設計有一定的指導意義。

關鍵詞：顆粒形狀 ；砂礫石土 ；循環荷載 ；離散元 ；剪脹性

中圖分類號：TU43            

文獻標志碼：A           

文章編號： 1005- 8249   (2025)  01- 0074- 08 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .01 .015

 

PENG Jun

(Fujian Hydrogeological Engineering Geological Survey and Research Institute ,  Zhangzhou 363000 ,  China) 

Abstract：Particle shape is one of the important factors affecting the mechanical properties of sand and gravel soils. In order to reveal the influence law and mechanism of particle shape on the mechanical properties of sand-gravel soil under cyclic loading, the particle flow discrete element method was used to simulate the cyclic shear test of sand-gravel soil. Then, by setting up refined comparative experiments, the influencing factors of particle shape are separated separately, and the effect of particle shape on the macro-mechanical response of sand-gravel soil is obtained. The results show that under a given cyclic load, the particle shape has little effect on the mean dynamic modulus, the peak friction angle is reduced due to the irregularity of the particle shape, and the critical friction angle is hardly affected by the particle shape; It has no effect on the shear modulus under cyclic loading, but the irregular particle shape will reduce the maximum dilation angle to a certain extent; the irregular particle shape will change the slope of the e-p critical state line under cyclic loading. Larger, smaller intercept; under the action of cyclic load, at the mesoscopic level, the contact density after homogenization is not affected by the particle shape, the uniform contact force distribution is not affected by the particle shape, and the contact force anisotropy is not affected. affected by particle shape. The research results help to construct a more accurate constitutive relation of sand-gravel soil.

Key words: particle shape; sand and gravel soil; cyclic load; discrete element; dilatancy

作者簡介： 彭   軍  (1983—) ,  男 ，碩士，高級工程師，研究方向：巖土工程。

收稿日期：2023 - 03 - 23