水压-应力耦合作用下灰岩力学特性试验

田树坤

doi:10.3969/j.issn.1001-1986.2020.03.020

水压-应力耦合作用下灰岩力学特性试验

田树坤^1,2

1. 中国铁建大桥工程局集团有限公司，天津 300300;
2. 西安建筑科技大学土木工程学院，陕西西安 710055

基金项目:

国家自然科学基金项目（51578447）

详细信息

作者简介:
田树坤,1975年生,男,浙江嵊州人,高级工程师,研究方向为隧道与地下空间工程.E-mail:445104722@qq.com

中图分类号: TU443
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出版历程
- 收稿日期: 2019-12-25
- 修回日期: 2020-04-01
- 发布日期: 2020-06-24

Test of mechanical properties of limestone under hydraulic pressure-stress coupling

TIAN Shukun^1,2

1. China Railway Construction Engineering Bureau Group Co. Ltd., Tianjin 300300, China;
2. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

Funds:

National Natural Science Foundation of China(51578447)

摘要

摘要: 为探究富水饱和灰岩体在水压-应力耦合作用下的力学特性，利用自主研发的可实现单轴压缩的渗透试验装置对不同水压强度下的灰岩试样进行压缩破坏试验，测试灰岩应力-应变特性，分析水压对单轴抗压强度、弹性模量、变形模量的影响，灰岩破碎特性与水压强度相关性以及孔隙变化规律。研究表明：增加的水压强度对灰岩应力-应变和强度特性有显著的影响。随着水压强度增大，应力-应变曲线的压密阶段相对延长而弹性相对缩短，峰值强度呈指数减小而弹性模量和变形模量均呈线性下降，表明水压作用显著降低了灰岩脆性。另外，灰岩弹性模量、变形模量均与峰值强度呈线性关系。增大的水压强度对灰岩宏观断裂具有显著影响而未对其破坏类型造成影响，随水压强度增加，碎块均一系数和单位质量孔隙体积均呈指数函数增加。研究成果为隧道建设中富水岩体的开挖稳定性分析提供参考。
- 灰岩 /
- 水压-应力耦合 /
- 应力-应变曲线 /
- 强度特征 /
- 贵阳下麦西隧道移动阅读
Abstract: To study the mechanical properties of limestone with water-rich saturated circumstance under water pressure-stress coupling, compression failure tests of limestone samples with different water pressure were carried out by using a self-developed permeability test device, the device can realize uniaxial compression test. Then, the stress-strain characteristics of limestone, the effect of hydraulic pressure on uniaxial compressive strength, the elastic modulus and the deformation modulus, and the correlation between breaking characteristics and hydraulic pressure were tested. The results show that the increased hydraulic pressure has a significant influence on the stress-strain curve and strength characteristics. With the increase of hydraulic strength, the compaction stage of stress-strain curve is relatively prolonged and elasticity stage is relatively shortened, the peak strength decreases exponentially while the elastic modulus and the deformation modulus decrease linearly, indicating that the brittleness of limestone is significantly reduced by water-rock interaction. Besides, the elastic modulus and the deformation modulus of limestone are linearly related to the peak strength. The increased hydraulic pressure has a significant effect on the macroscopic fracture of limestone but not on its failure type. With the increase of hydraulic pressure, both the homogenization coefficient and the pore volume per unit mass of limestone increase by exponential function. The experimental results could provide reference for the excavation stability analysis of water-rich rock mass in tunnel construction.
- limestone /
- hydraulic pressure-stress coupling /
- stress-strain curve /
- strength characteristics /
- Xiamaixi tunnel in Guiyang

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