【摘要】：為深入研究循環(huán)加卸載作用下巖體的變形規(guī)律,針對三峽庫區(qū)砂巖進(jìn)行了56組循環(huán)加卸載試驗(yàn)。根據(jù)試驗(yàn)的不同步現(xiàn)象,對應(yīng)力 應(yīng)變滯后概念進(jìn)行修正:(1)應(yīng)力超前于應(yīng)變和應(yīng)力滯后于應(yīng)變現(xiàn)象共存,故將"應(yīng)力 應(yīng)變滯后現(xiàn)象"更名為"應(yīng)力 應(yīng)變不同步現(xiàn)象"更為合理;(2)在應(yīng)力 應(yīng)變不同步現(xiàn)象的基礎(chǔ)上,應(yīng)考慮應(yīng)力速率 應(yīng)變速率的不同步現(xiàn)象。通過分析循環(huán)加卸載試驗(yàn)的不同步機(jī)制,提出應(yīng)力 應(yīng)變吸引點(diǎn)、應(yīng)力速率 應(yīng)變速率吸引點(diǎn)、應(yīng)力 應(yīng)變補(bǔ)償機(jī)制和應(yīng)力速率 應(yīng)變速率補(bǔ)償機(jī)制4個概念,并且得到:應(yīng)力 應(yīng)變同步與應(yīng)力速率 應(yīng)變速率同步不能同時(shí)出現(xiàn);不同步現(xiàn)象是必然而同步僅存在于某一時(shí)刻點(diǎn);應(yīng)力 應(yīng)變處于螺旋式循環(huán)遞進(jìn)的過程�；谘h(huán)加卸載試驗(yàn),首次發(fā)現(xiàn)應(yīng)力速率 應(yīng)變速率不同步現(xiàn)象,在不同步現(xiàn)象中提出了3個不同步階段的定義,并通過分析預(yù)測變形速率 實(shí)際變形速率、表觀彈性模量以及巖樣的瞬時(shí)泊松比隨時(shí)間的變化規(guī)律,提出3種對不同步階段定量判別的方法。此外,基于同頻率不同峰值強(qiáng)度下試驗(yàn)得到,隨著峰值強(qiáng)度f(t)的增加,巖樣的E(t)值逐漸增加,式E(t)?af(t)?b吻合度也逐漸增加。
[Abstract]:In order to study the deformation rule of rock mass under cyclic loading and unloading, 56 groups of cyclic loading and unloading tests were carried out for sandstone in the three Gorges Reservoir area. According to the phenomenon of out-of-synchronization, the concept of stress-strain lag is modified: (1) stress is ahead of strain and stress-lag is coexisting with strain; Therefore, it is more reasonable to change the name of "stress-strain lag phenomenon" to "stress-strain out-of-sync phenomenon". (2) the stress rate and strain rate should be taken into account on the basis of stress-strain asynchronous phenomenon. By analyzing the asynchronous mechanism of cyclic loading and unloading test, four concepts are put forward: stress / strain attraction point, stress rate / strain rate attraction point, stress / strain compensation mechanism and stress rate / strain rate compensation mechanism. The results show that the synchronization of stress-strain and stress-rate-strain can not occur at the same time. The phenomenon of out-of-sync is inevitable, and synchronization only exists at a certain point of time, and the stress and strain are in the spiral cycle progressive process. Based on cyclic loading and unloading tests, the phenomenon of stress rate / strain rate dissynchronism is found for the first time. In this paper, the definition of three out-of-sync stages is put forward, and the deformation rate / actual deformation rate is predicted by analyzing and predicting the deformation rate. Based on the variation of apparent elastic modulus and instantaneous Poisson ratio of rock samples with time, three methods for quantificationally discriminating out-of-sync stage are proposed. In addition, based on the same frequency and different peak intensity, it is found that with the increase of peak intensity f (t), the E (t) value of rock samples increases gradually, and the E (t)? af (t)? b coincidence also increases gradually.
【作者單位】： 三峽大學(xué)三峽庫區(qū)地質(zhì)災(zāi)害教育部重點(diǎn)實(shí)驗(yàn)室;三峽大學(xué)土木與建筑學(xué)院;
【基金】：國家科技支撐計(jì)劃項(xiàng)目(2015BAB07B08) 國家自然科學(xué)基金資助項(xiàng)目(51579138) 長江科學(xué)院開放研究基金資助項(xiàng)目(CKWV2016377/KY)~~
【分類號】：TV223

【共引文獻(xiàn)】

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