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高徑比對(duì)板巖單軸抗壓強(qiáng)度的尺寸效應(yīng)試驗(yàn)研究(已修改)

2025-08-17 18:12 本頁(yè)面
 

【正文】 高徑比對(duì)板巖單軸抗壓強(qiáng)度尺寸效應(yīng)的試驗(yàn)研究劉曉紅,陳崗,趙青山(,湖南 岳陽(yáng),41400)摘要:對(duì)不同高徑比的板巖試件進(jìn)行了大量單軸抗壓強(qiáng)度試驗(yàn),獲得了3種風(fēng)化程度板巖強(qiáng)度隨試件高徑比增大而非線性減小的關(guān)系曲線及二者間的經(jīng)驗(yàn)關(guān)系式。依據(jù)板巖標(biāo)準(zhǔn)試件與非標(biāo)準(zhǔn)試件的強(qiáng)度比值,提出了巖石強(qiáng)度尺寸效應(yīng)系數(shù)的概念,繪制了不同風(fēng)化程度板巖強(qiáng)度尺寸效應(yīng)系數(shù)隨高徑比增大而非線性增大的關(guān)系曲線,給出了3種不同風(fēng)化程度板巖強(qiáng)度尺寸效應(yīng)系數(shù)的經(jīng)驗(yàn)計(jì)算式。試驗(yàn)結(jié)果分析表明,巖石風(fēng)化程度不同(強(qiáng)度不同),其強(qiáng)度尺寸效應(yīng)不同,即巖石強(qiáng)度越大,其尺寸效應(yīng)越顯著。本文經(jīng)驗(yàn)公式的提出為非標(biāo)準(zhǔn)試件板巖單軸抗壓強(qiáng)度的修正提供新的便利途徑,也可為其它各類巖石強(qiáng)度尺寸效應(yīng)的修正提供參考。關(guān)鍵詞:板巖強(qiáng)度;尺寸效應(yīng);高徑比;試驗(yàn)研究Experimental study on the uniaxial pressive strength size effect by the ratio of height to diameter of slate specimenLIU Xiaohong, CHEN Gang, CHEN Jiguang (Department of Construction amp。 Engineering of Hunan Institute of Science and Technology, Yueyang, Hunan 414000, China)Abstract:According to a lot of uniaxial pressive strength on different ratio of height to diameter of the slate specimen, 3 relation curves and empirical formulas between specimens strengthen and ratio of height to diameter are obtained. Based on the strength ratio of standard and non standard specimens, the concept of rock strength size effect coefficient is put forward, and relation curves between slate strength size effect coefficient and ratio of height to diameter are drawn, and empirical formulas of rock strength size effect coefficient are given for 3 different weathering degrees of slate. The results showed that, the bigger the rock strength is, the more obvious the size effect is. The empirical formulas in this paper provide convenient new way for the correction of slate uniaxial pressive strength of non standard specimen, and also provide reference for other types of rock.Keywords:slate strength;size effect;ratio of height to diameter;experimental study0 引言大量前人研究成果表明[15],巖石強(qiáng)度具有明顯的尺寸效應(yīng),即巖石強(qiáng)度不再為一個(gè)常數(shù),而是隨試件尺寸的增大而減小。尺寸效應(yīng)因巖石類型、巖石風(fēng)化程度、試驗(yàn)條件、地質(zhì)環(huán)境及區(qū)域特征等因素的不同而不同。王劍波等[6]對(duì)煤巖單軸抗壓強(qiáng)度尺寸效應(yīng)的試驗(yàn)及理論研究表明:隨著煤巖巖樣高寬比的增加,其單軸抗壓強(qiáng)度呈下降趨勢(shì),彈性模量呈上升趨勢(shì)。張后全等[7]基于不同高徑比的灰?guī)r試件單軸抗壓強(qiáng)度尺寸效應(yīng)現(xiàn)象,從理論上分析了產(chǎn)生巖石強(qiáng)度尺寸效應(yīng)的原因。尤明慶[
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