本文關(guān)鍵詞：基于應(yīng)力集中強(qiáng)度比的單裂隙巖石破壞過程研究　出處：《巖土力學(xué)》2017年S1期 　論文類型：期刊論文

  更多相關(guān)文章： 應(yīng)力集中強(qiáng)度比 裂隙巖石 單軸加載 PIV粒子成像測速

【摘要】：對含單裂隙巖石開展單軸壓縮試驗(yàn),采用PIV粒子成像測速系統(tǒng)實(shí)時采集試驗(yàn)過程中巖樣照片,借助PIVProcess流場處理系統(tǒng)將照片轉(zhuǎn)為位移矢量�；谟邢拊碛�(jì)算應(yīng)力,提出以應(yīng)力集中強(qiáng)度比k的變化規(guī)律劃分裂隙巖石變形破壞過程的方法,分析裂隙巖石變形破壞各階段應(yīng)力場特征。研究結(jié)果表明,加載過程中k隨著軸向應(yīng)變的增加呈現(xiàn)增大-穩(wěn)定-波動-持續(xù)增大的變化規(guī)律,根據(jù)k變化規(guī)律,獲得幾個重要應(yīng)力閥值即閉合應(yīng)力σ_(cc)、起裂應(yīng)力σ_(ci)、損傷應(yīng)力σ_(cd)值分別為(0.13~0.17)σ_p、(0.48~0.59)σ_p和(0.80~0.92)σ_p(σ_p為峰值應(yīng)力);k波動變化結(jié)束后,急劇增大,宏觀裂紋在應(yīng)力集中區(qū)域出現(xiàn);應(yīng)力集中區(qū)域與宏觀裂紋分布區(qū)域具有較好的一致性。研究結(jié)果有助于提升人們對巖石應(yīng)力場變化的認(rèn)識,為裂隙巖石破壞過程階段劃分的研究提供一個新方法。
[Abstract]:The single fractured rock in uniaxial compression test, the sample photos real-time acquisition test procedure for PIV particle image velocimetry system, with the help of PIVProcess flow processing system to the photo. The displacement vector stress calculation of finite element method based on the principle of the stress intensity ratio changes in K division of fractured rock deformation and failure process of the analysis of fractured rock failure stages, deformation characteristics of the stress field. The results show that the loading process of K with the increase of axial strain changed with increasing and stable fluctuation - continues to increase, according to the change of K, obtain several important stress threshold of the closure stress _ (CC), crack initiation stress Sigma _ (CI), injury stress _ (CD) = (0.13~0.17) _p, (0.48~0.59) _p (0.80~0.92) and sigma Sigma _p (_p peak stress); the end of the K fluctuation, increases rapidly, the macroscopic crack in the stress concentration area There is a good consistency between the stress concentration area and the macro crack distribution area. The research results are helpful to enhance people's understanding of the change of rock stress field, and provide a new method for the study of the stage division of fractured rock failure process.

【作者單位】： 成都理工大學(xué)地質(zhì)災(zāi)害防治與地質(zhì)環(huán)境保護(hù)國家重點(diǎn)實(shí)驗(yàn)室;成都理工大學(xué)環(huán)境與土木工程學(xué)院;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(No.2011CB013501) 國家自然科學(xué)基金面上項(xiàng)目(No.41272333)~~
【分類號】：TU45
【正文快照】： The National Basic Research Programme of China(973 Programme)(2011CB013501)and the National Natural Science Foundation of China(41272333).水電資源的開發(fā)利用是我國西部大開發(fā)戰(zhàn)略的重要課題,解決這一課題首先面對的是大型巖體工程的設(shè)計(jì)和施工。天然巖體經(jīng)過長期

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