【摘要】：為了清晰了解具有脆性破壞特征的頁(yè)巖在拉伸破壞下的能量統(tǒng)計(jì)分布特征,研究整體破壞能量分布與局部應(yīng)力下的能量統(tǒng)計(jì)分布規(guī)律,從而為現(xiàn)場(chǎng)壓裂機(jī)制提供理論依據(jù)。選取四川盆地南部地區(qū)龍馬溪組鈣質(zhì)頁(yè)巖進(jìn)行巴西劈裂(間接拉伸)的聲發(fā)射試驗(yàn),加載速率分別為0.005,0.05,0.5 mm/min。結(jié)果表明:(1)在各個(gè)加載速率下巖石破壞過(guò)程的能量概率密度函數(shù)符合冪定律分布,并遵循時(shí)間上的冪律無(wú)尺度分布。(2)局部應(yīng)力下的能量概率密度函數(shù)也符合冪定律分布,與冪值分布圖變化規(guī)律形成良好對(duì)應(yīng),各局部應(yīng)力階段下的能量概率分布曲線向著整體破壞的能量概率分布曲線流動(dòng)。(3)當(dāng)應(yīng)力σ達(dá)到0.9σmax,系統(tǒng)進(jìn)入臨界態(tài),能量分布曲線與冪值分布曲線接近于整體破壞過(guò)程中的能量分布曲線與冪值分布曲線,并逐漸重合。(4)試驗(yàn)結(jié)果與纖維束模型數(shù)值模擬結(jié)果相符,當(dāng)應(yīng)力σ達(dá)到試件破壞應(yīng)力的90%后,分叉率ξ急劇增大,直至巖石破壞,能良好驗(yàn)證臨界態(tài)特性。
[Abstract]:In order to clearly understand the energy statistical distribution characteristics of shale with brittle failure characteristics under tensile failure, the distribution of whole failure energy and local stress is studied, which provides a theoretical basis for the field fracturing mechanism. Acoustic emission tests of Brazilian fracturing (indirect stretching) of calcareous shale of Longmaxi formation in the southern part of Sichuan Basin were carried out at the loading rate of 0.005 0. 05 mm/min. and 0. 05 mm/min., respectively. The results show that: (1) the energy probability density function of rock failure process at different loading rates obeys the power law distribution. The energy probability density function under local stress also obeys the power law distribution, which corresponds well with the law of power distribution, and follows the scale-free distribution of power law in time. (2) the energy probability density function under local stress also obeys the power law distribution. The energy probability distribution curves at each local stress stage flow to the whole failure energy probability distribution curves. (3) when the stress 蟽 reaches 0. 9 蟽 max, system, the critical state is obtained. The energy distribution curve and the power value distribution curve are close to the power distribution curve in the whole failure process, and gradually coincide. (4) the experimental results agree with the numerical simulation results of the fiber bundle model. When the stress 蟽 reaches 90% of the failure stress of the specimen, the bifurcation rate 尉 increases sharply until the rock failure, and the critical state characteristics can be well verified.
【作者單位】： 重慶大學(xué)煤礦災(zāi)害動(dòng)力學(xué)與控制國(guó)家重點(diǎn)實(shí)驗(yàn)室;西南大學(xué)地理科學(xué)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金青年基金資助項(xiàng)目(51304256) 高等學(xué)校博士學(xué)科點(diǎn)專(zhuān)項(xiàng)科研基金資助課題資助項(xiàng)目(20130191130003) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃資助項(xiàng)目(2014CB239204)
【分類(lèi)號(hào)】：TD315

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