三种典型岩石单轴抗压强度的尺寸效应试验研究

王连山; 孙东生; 郑秀华; 赵卫华; 李阿伟; 李全

三种典型岩石单轴抗压强度的尺寸效应试验研究

王连山^{1, 2,},
孙东生^{1, 3, ,},
郑秀华²,
赵卫华^{1, 3},
李阿伟^{1, 3},
李全^{1, 3}

1.
中国地质科学院地质力学研究所, 北京 100081
2.
中国地质大学(北京)工程技术学院, 北京 100083
3.
国土资源部新构造运动与地质灾害重点实验室, 北京 100081

基金项目:

国家自然科学基金项目 41404080

国土资源部公益性行业专项 201211076

详细信息

作者简介:
王连山(1991-), 男, 硕士研究生, 主要从事岩土工程领域相关工作。E-mail:wls@cugb.edu.cn

通讯作者:
孙东生(1980-), 男, 博士, 高级工程师, 主要从事原地应力测量、岩石力学试验方面的研究。E-mail:dongshengsun@cags.ac.cn

中图分类号: TU452
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出版历程
- 收稿日期: 2016-06-01
- 刊出日期: 2017-04-01

SIZE EFFECT EXPERIMENT OF UNIAXIAL COMPRESSIVE STRENGTH OF THREE TYPICAL ROCKS

WANG Lian-shan^{1, 2
,},
SUN Dong-sheng^{1, 3
, ,},
ZHENG Xiu-hua²,
ZHAO Wei-hua^{1, 3},
LI A-wei^{1, 3},
LI Quan^{1, 3}

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
3.
Key Laboratory of Neotectonic Movement & Geohazard, Ministry of Land and Resources, Beijing 100081, China

摘要

摘要: 尺寸效应是岩石力学领域研究的难点与热点。本文利用自主研发的大尺寸刚性试验机，开展了最大样品尺寸为400 mm×400 mm×800 mm大理岩、闪长岩和凝灰岩的单轴抗压强度试验，从等高宽比条件下岩石强度的尺寸效应和不同高宽比条件下岩石强度变化两个方面开展了岩石强度尺寸效应研究，结果表明：相同高宽比条件下，岩石强度随样品尺寸的增大呈对数形式减小，且逐渐趋于定值；不同高宽比情况，岩石长宽为200 mm×200 mm，高度分别为200 mm，400 mm，600 mm和800 mm，岩石单轴抗压强度随高宽比的增加表现出先减小后增大的变化规律，对应的破坏形式表现为复杂劈裂、劈裂和剪切破坏。本文试验结果为丰富岩石尺寸效应研究提供了基础数据，同时对实际工程中岩体强度尺寸效应的修正具有一定参考价值。
- 大尺寸岩石 /
- 单轴抗压强度 /
- 尺寸效应 /
- 高宽比 /
- 破坏形式
Abstract: Size effect is a popular and difficult issue in the field of rock mechanics. In this paper, the uniaxial compressive strength of marble, diorite and tuffsamples with the maximum sample size 400 mm×400 mm×800 mm were tested using the self-developed large-scale rigid testing machine. Two cases of size effect of rock uniaxial compression strength were conducted:one is with the same aspect ratio and the other is different aspect ratio with the same length and width. The results show that, with the increase of samples dimensions, the uniaxial compression strength decrease in logarithmic function form and gradually approach to a certain value in the case that with the same aspect ratio; In the case that with different aspect ratios, the length and width of the samples are 200 mm×200 mm, and the heights are 200 mm, 400 mm, 600 mm and 800 mm respectively. The uniaxial compression strength decreased first and then increased as the increase of aspect ratio of samples. And the corresponding failure modes of samples are complex splitting, splitting and shear failure respectively as the increase of aspect ratio. The results of uniaxial compression strength of different dimensions presented in this paper provide the basic data for the size effect research of rock samples. At the same time, the results have some reference value for the correction of size effect in the practical engineering.
- large-size rock /
- uniaxial compressive strength /
- size effect /
- aspect ratio /
- failure mode

HTML全文

图 1 样品显微薄片照片(正交偏光)

a-大理石；b-闪长石；c-凝灰石
Qtz-石英；Dol-白云石；Mus-白云母；Fsp-长石；Bit-黑云母；Hb-角闪石

Figure 1. Microstructure photo of rock samples (crossed polars)

下载: 全尺寸图片幻灯片

图 2 10000 kN室内双轴加载装置

Figure 2. 10000 kN indoor biaxial loading device

下载: 全尺寸图片幻灯片

图 3 三种岩石平均抗压强度尺寸效应拟合曲线

Figure 3. Fitting curves of average compressive strength size effect of three kinds of rocks

下载: 全尺寸图片幻灯片

图 4 不同宽高比条件下岩石单轴抗压强度(样品长宽为200mm×200mm)

Figure 4. Uniaxial compressive strength with different aspect ratio

下载: 全尺寸图片幻灯片

图 5 三种岩石不同高宽比破坏形式对比图

Figure 5. The different failure mode contrast photos of three kinds of rocks with the different aspect ratios

下载: 全尺寸图片幻灯片

表 1 各个尺寸岩样的力学参数

Table 1. The mechanical parameters of each sample size

试验类型	样品长×宽×高/ mm	UCS/MPa
试验类型	样品长×宽×高/ mm	大理岩	闪长岩	凝灰岩
等高宽比	25×25×50	95.9	120.5	131.7
	50×50×100	74.2	104.1	116.9
	100×100×200	48.6	75.2	99.6
	200×200×400	13.8	37.2	53.0
	300×300×600	31.6	55.9	57.2
	400×400×800	51.0	47.1	54.2
不同高宽比	200×200×200	59.1	72.8	67.7
	200×200×400	13.8	37.2	53.0
	200×200×600	31.1	65.5	21.0
	200×200×800	47.9	103.3	64.0
	UCS：岩石的单轴抗压强度

下载: 导出CSV

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