围压效应对钙泥质胶结砂岩强度和变形的影响

doi:10.12068/j.issn.1005-3026.2018.02.021

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (2): 254-259.DOI: 10.12068/j.issn.1005-3026.2018.02.021

围压效应对钙泥质胶结砂岩强度和变形的影响

赵永川^1,2，杨天鸿^1,2，秦涛^1,2，汪泓^1,2

(1. 东北大学深部金属矿山安全开采教育部重点实验室，辽宁沈阳110819； 2. 东北大学资源与土木工程学院，辽宁沈阳110819)

收稿日期:2016-09-18 修回日期:2016-09-18 出版日期:2018-02-15 发布日期:2018-02-09
通讯作者: 赵永川
作者简介:赵永川(1989-)，男，河北沧州人，东北大学博士研究生；杨天鸿(1968-)，男，辽宁抚顺人，东北大学教授，博士生导师.
基金资助:
国家重点研发计划项目(2016YFC0801602)；国家自然科学基金资助项目(51604062)；黑龙江省自然科学基金资助项目(E2015031).

Effects of Confining Pressure Paths on Strength and Deformation of Calcareous Argillaceous Cemmented Sandstones

ZHAO Yong-chuan^1,2， YANG Tian-hong^1,2， QIN Tao^1,2， WANG Hong^1,2

1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines， Northeastern University， Shenyang 110819， China；2. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.

Received:2016-09-18 Revised:2016-09-18 Online:2018-02-15 Published:2018-02-09
Contact: YANG Tian-hong
About author:-
Supported by:
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摘要/Abstract

摘要： 针对西部地区侏罗系砂岩成岩年代新、胶结程度较差，以及煤矿高强度开采的特点，开展恒定围压下三轴压缩实验，不同速率卸围压，以及单块多级加载实验，研究围压路径变化效应对钙泥质胶结砂岩强度和变形特征的影响.实验表明:西部中粒砂岩峰值强度、残余强度、峰值应变、弹性模量、泊松比等力学参数均对围压依赖性较强，且由于其钙泥质胶结的细观特性使其黏聚力、内摩擦角相比其他地区、其他年代的砂岩较低.随着围压的增大，试件由简单平整破裂面向复杂非平整多破裂面破裂模式转化.变围压加载过程中，围压的变化对砂岩的承载能力和变性特征影响显著，围压主要通过束缚试件横向变形和裂纹扩展，以及增大内部摩擦的方式影响岩体的力学特征，围压卸载和加载对岩体力学参数的影响规律可为采场推进速度优化和围岩支护分析提供一定的参考.

关键词: 钙泥质砂岩, 围压卸载速率, 多级三轴加载, 峰值强度, 变形

Abstract: Considering the characteristics of short diagenetic age and high intensity mining of Jurassic weak cemented sandstone in western China， the conventional triaxial compression tests， different unloading rates of confining pressure in triaxial compression tests and multi-stage triaxial tests were conducted to study the effects of confining pressure path on the strength and deformation. The results show that: the peak strength， residual strength， peak strain， elastic modulus and Poisson ratio depend on the confining pressure strongly， and the cohesion and internal friction angle of the sandstones in western China are lower than those of other sandstones. As the confining pressure increases， the failure mode transits from single plane fracture to complex multi-fracture. During the loading process， the change of confining pressure can remarkably affect the strength and the deformation characteristic by restricting lateral dilatation and increasing the angle of internal friction. The effect of unloading and loading confining pressure path on the mechanical parameters can provide references for the optimization of mining velocity and the support design of the surrounding rock masses.

Key words: calcareous argillaceous cemented sandstone, confining unloading rate, multi-stage triaxial loading, peak strength, deformation

中图分类号:

TU458

赵永川，杨天鸿，秦涛，汪泓. 围压效应对钙泥质胶结砂岩强度和变形的影响[J]. 东北大学学报:自然科学版, 2018, 39(2): 254-259.

ZHAO Yong-chuan， YANG Tian-hong， QIN Tao， WANG Hong. Effects of Confining Pressure Paths on Strength and Deformation of Calcareous Argillaceous Cemmented Sandstones[J]. Journal of Northeastern University Natural Science, 2018, 39(2): 254-259.

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围压效应对钙泥质胶结砂岩强度和变形的影响

Effects of Confining Pressure Paths on Strength and Deformation of Calcareous Argillaceous Cemmented Sandstones

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