加筋红砂岩力学特性试验研究及数值模拟
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中铁大桥勘测设计院集团有限公司武汉分公司

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中图分类号:

TU191

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


Experimental Study and Numerical Simulation on Mechanical Properties of Reinforced Red Sandstone
Author:
Affiliation:

1.Wuhan Branch of China Railway Major Bridge Reconnaissance&2.Design Institute Co., Ltd

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    为改变传统红砂岩由于强度低而无法作为高速公路路基填料的现状,拓展此类岩土体的应用范围,将红砂岩与土工格栅及格宾组合形成加筋土,探究红砂岩加筋条件下的力学特性。试验采用粗粒土三轴剪切仪,进行0层、2层、3层水平铺筋条件下的不排水剪切试验,并引入强度比参数对加筋效果进行定量评价。试验表明:当轴向应变小于2%时,加筋土的强度没有明显变化,随着轴向应变继续增大,加筋土强度逐渐超过纯土样,在400 kPa围压时大主应力差最多提高50%;通过对加筋效果的定量分析发现,在相同围压和加筋层数条件下,相同层数的格宾加筋强度普遍高于格栅加筋,其加筋效果系数均在1.39以上。筋材虽然能够明显提高红砂岩的峰值强度和土体延性,使红砂岩的黏聚力大幅提升,但摩擦角提升幅度不大。采用邓肯-张模型和离散元软件对加筋土的力学特性进行描述和验证。

    Abstract:

    In order to change the status quo that traditional red sandstone cannot be used as highway subgrade filling due to its low strength, and to expand the application range of this kind of rock and soil, this study combines red sandstone with geogrid and gabion to form reinforced soil, and explores the reinforcement of red sandstone Mechanical properties under conditions. In the experiment, the coarse-grained soil triaxial shear tester was used to carry out the undrained shear test under the condition of 0-layer, 2-layer and 3-layer horizontal reinforcement, and the strength ratio parameter was introduced to quantitatively evaluate the reinforcement effect. The test shows that when the axial strain is less than 2%, the strength of the reinforced soil does not change significantly. As the axial strain continues to increase, the strength of the reinforced soil gradually exceeds that of the pure soil sample, and the large principal stress difference is the largest at 400 kPa confining pressure Increase by 50%; Through the quantitative analysis of the reinforcement effect, it is found that under the same confining pressure and the same number of layers, the gabion reinforcement strength is generally higher than that of the grille reinforcement, and the reinforcement effect coefficients are all above 1.39; Although the reinforcement can significantly increase the peak strength of the red sandstone and the ductility of the soil, and greatly increase the cohesion of the red sandstone, the increase in the friction angle is not large. Finally, the Duncan-Chang model and discrete element software are used to describe and verify the mechanical properties of the reinforced soil.

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张和. 加筋红砂岩力学特性试验研究及数值模拟[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-09-12
  • 最后修改日期:2021-12-16
  • 录用日期:2021-12-26
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