| 韩铁林,师俊平,陈蕴生.干湿循环和化学腐蚀共同作用下单裂隙非贯通试样力学特征的试验研究[J].水利学报,2016,47(12):1566-1576 |
| 干湿循环和化学腐蚀共同作用下单裂隙非贯通试样力学特征的试验研究 |
| Laboratory study on mechanical behaviours of the single-intermittent cracked masses under the combined action of water chemical corrosion and dry-wet cycles |
| 投稿时间：2016-06-13 |
| DOI：10.13243/j.cnki.slxb.20160616 |
| 中文关键词: 岩石力学 裂隙岩体 化学腐蚀 干湿循环 力学特征 破坏特征 |
| 英文关键词: rock mechanics jointed rock mass chemical erosion dry wet cycle mechanical characteris-tics damage characteristics |
| 基金项目:国家自然科学基金项目（51269024，11302167）；陕西省教育厅自然科学专项（2013JK0609） |
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| 中文摘要: |
| 以水库库岸边坡消落带节理岩体的实际赋存环境为背景，采用在类岩石材料中预制裂隙的方法来模拟节理岩体，通过干湿循环试验的方法，研究了裂隙试样在酸性Na2SO4溶液、中性Na2SO4溶液和碱性NaOH溶液中浸泡并经历干湿循环作用后的力学特性和破坏特征，分析了浸泡在不同化学溶液中的裂隙试样在经历不同干湿循环作用后其力学特征的变化规律。研究结果表明：自然及不同化学溶液下裂隙试样的峰值强度和弹性模量随着裂隙倾角的增加均呈现出先减小后增大的变化规律。不同化学溶液和干湿循环共同作用下裂隙试样的劣化程度逐渐加剧，其峰值强度和弹性模量随干湿循环次数的劣化规律基本一致，但不同裂隙倾角下其劣化程度却存在一定的差异，其中裂隙倾角为45°时，试样的劣化程度最大，90°和30°时居中，而60°和0°时最小。酸性化学溶液加剧了裂隙试样的干湿损伤劣化程度，而碱性化学溶液对裂隙试样却存在一定的抑制作用。完整试样和裂隙倾角为90°试样的破坏特征基本相似，为张拉破坏模式；0°时裂隙试样呈现为“H”型的张拉破坏模式；在30°和45°时其呈现出张剪混合破坏；60°时为剪切破坏。 |
| 英文摘要: |
| In consideration with the actual environment of the hydro-fluctuation belt of a typical bank slope, by using prefabricated-cracked rock-like materials to simulate jointed rock mass, one test scheme of dry-wet cycles is adopted to explore the mechanical behaviors and failure characteristics of the fractured rock. The variation of mechanical behaviors of the fractured specimens with different dry-wet cycle times and different chemical soak solutions is analyzed. Experimental results show that, under natural state and with different chemical solutions, both the peak strength and elastic modulus of fractured specimens initial-ly decrease and then increase with the continuous increase of the inclination angle. It is found that, with the increase of the number of dry-wet cycles and also with different chemical soak solutions, the mechani-cal behaviors of fractured specimens are gradually deteriorated, and the deterioration tendencies of peak strength and elastic modulus are basically consistent, but there is some difference:the maximum deteriora-tion of the fractured specimens occurs at the crack inclination angle 45°, the moderate situation is at crack inclination angle about 90° and 30°, and the minimum situation meets with at 60° and 0°, respec-tively. It is also found that the acid chemical solutions are able to aggravate the deterioration of wet-dry damage of fractured specimens, while the alkaline solutions have some resisting effect. Additionally, it is observed from experimental results that:the intact specimens and the ones with 90℃rack inclination angle have similar failure mode, and it is tensile failure mode; the specimens with 0° crack angle are broken with the H-tensile failure mode; the fracture specimens with the crack inclination angle between 30°~45° will have a mixed tensile-shear failure model; the shear failure mode is found when specimens have 60° crack inclination angle. |
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