發(fā)布時間：2018-02-12 21:17

  本文關鍵詞： 三點彎曲 北山花崗巖 振鈴計數率 加卸載 飽和　出處：《巖土工程學報》2017年08期 　論文類型：期刊論文

【摘要】：利用MTS815 Flex Test GT巖石力學試驗系統(tǒng)及聲發(fā)射(AE)三維定位實時監(jiān)測系統(tǒng),對兩種不同含水狀態(tài)的深部細粒英云閃長巖進行了三點彎曲試驗,得到烘干狀態(tài)及飽水狀態(tài)下花崗巖的載荷 LPD曲線、聲發(fā)射振鈴計數率、AE撞擊數曲線。試驗結果表明,在水的影響下花崗巖的斷裂力學特性和聲發(fā)射特征都有較大變化。飽水狀態(tài)巖樣的平均斷裂韌度為干燥狀態(tài)下的87.5%,且在試驗過程中整體的變形變大,其剛度變小,脆性減弱,強度變低。在巖樣三點彎曲的各個階段,飽水巖樣的聲發(fā)射振鈴計數率遠小于干燥狀態(tài)巖樣;在試驗過程中出現(xiàn)了明顯的Kaiser效應。巖樣以V型截面拉斷破壞為主;飽和巖樣聲發(fā)射事件數遠大于干燥巖樣。研究結果對于受含水層影響的深部花崗巖巖土工程設計及施工具有重要的理論及實際指導意義。
[Abstract]:Using MTS815 Flex Test GT rock mechanics test system and acoustic emission (AE) 3D positioning real time monitoring system, three point bending tests were carried out on two kinds of deep fine-grained quartz diorite with different water-bearing states. The load LPD curve and AE impact number curve of granite under drying and saturated state are obtained. The experimental results show that the acoustic emission ring counting rate is higher than AE impact number curve. Under the influence of water, the fracture mechanics characteristics and acoustic emission characteristics of granite have great changes. The average fracture toughness of saturated rock samples is 87.5% in dry state, and the whole deformation becomes larger, the stiffness becomes smaller and the brittleness weakens during the test. In each stage of three-point bending of rock sample, the counting rate of acoustic emission ring of saturated rock sample is much smaller than that of dry rock sample, and there is obvious Kaiser effect in the process of test. The number of acoustic emission events of saturated rock samples is much larger than that of dry rock samples. The results of the study have important theoretical and practical guiding significance for the design and construction of deep granite geotechnical engineering affected by aquifer.
【作者單位】： 四川大學水利水電學院;核工業(yè)北京地質研究院環(huán)境工程研究所;
【基金】：國家自然科學基金項目(51374148,51641405) 四川省青年基金項目(2017JQ0003)
【分類號】：TU45

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