本文關(guān)鍵詞： 深部巖石 三維高靜載 頻繁動(dòng)態(tài)擾動(dòng) 損傷特性 本構(gòu)模型　出處：《巖土力學(xué)》2017年08期 　論文類型：期刊論文

【摘要】：采用改進(jìn)的SHPB試驗(yàn)裝置,進(jìn)行深部巖石的三維高靜載頻繁動(dòng)態(tài)擾動(dòng)試驗(yàn),分析動(dòng)態(tài)應(yīng)力-應(yīng)變曲線的一般特征,可將其細(xì)分為微裂紋穩(wěn)定發(fā)展、微裂紋非穩(wěn)定發(fā)展、疲勞損傷、疲勞破壞4個(gè)階段進(jìn)行描述,其中峰值后的2個(gè)階段處于動(dòng)態(tài)應(yīng)力卸載過程�；谶B續(xù)因子、應(yīng)變等效原理及統(tǒng)計(jì)損傷理論定義巖石的損傷變量并推演損傷演化方程,采用組合模型法建立巖石的本構(gòu)模型。結(jié)合試驗(yàn)數(shù)據(jù),驗(yàn)證巖石的損傷演化規(guī)律及建立的本構(gòu)模型,結(jié)果表明:利用推演的損傷演化方程計(jì)算出損傷變量,其與動(dòng)態(tài)應(yīng)變的關(guān)系曲線符合試驗(yàn)中巖樣的損傷規(guī)律;建立本構(gòu)方程的擬合曲線與試驗(yàn)曲線具有較好的一致性,說明建立的本構(gòu)模型可以用來預(yù)測深部巖石處于三維高靜載頻繁動(dòng)態(tài)擾動(dòng)時(shí)的動(dòng)力學(xué)特性。
[Abstract]:By using the improved SHPB test device, the frequent dynamic disturbance test of three dimensional Gao Jing loading on deep rock is carried out, and the general characteristics of dynamic stress-strain curve are analyzed, which can be subdivided into microcrack stable development, micro-crack unsteady development and fatigue damage. The four stages of fatigue failure are described, in which the two phases after the peak are in the dynamic stress unloading process. Based on the continuum factor, the strain equivalent principle and the statistical damage theory, the damage variables of rock are defined and the damage evolution equation is derived. Combined with the experimental data, the damage evolution law and constitutive model of rock are verified. The results show that the damage variable is calculated by using the derived damage evolution equation. The curve of relationship with dynamic strain accords with the damage law of rock samples in the test, and the fitting curve of the constitutive equation is in good agreement with the test curve. It is concluded that the constitutive model can be used to predict the dynamic characteristics of deep rocks under the frequent dynamic disturbances of three dimensional Gao Jing.
【作者單位】： 河南理工大學(xué)能源科學(xué)與工程學(xué)院;中南大學(xué)資源與安全工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(No.51474250) 國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)資助項(xiàng)目(No.2010CB732004)~~
【分類號(hào)】：TU45

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