本文關(guān)鍵詞： 巖石力學(xué) 真三軸應(yīng)力 球應(yīng)力 偏應(yīng)力 變形 應(yīng)力Lode角　出處：《巖石力學(xué)與工程學(xué)報(bào)》2017年09期 　論文類型：期刊論文

【摘要】：基于自主研發(fā)的"多功能真三軸流固耦合試驗(yàn)系統(tǒng)",進(jìn)行真三軸應(yīng)力(σ1σ2σ3)條件下,保持球應(yīng)力、偏應(yīng)力不變而改變應(yīng)力Lode角試驗(yàn),研究了球應(yīng)力、偏應(yīng)力不變條件下,應(yīng)力Lode角旋轉(zhuǎn)對(duì)巖石變形特性的影響。結(jié)果表明:3個(gè)主應(yīng)變、體應(yīng)變及偏應(yīng)變均隨應(yīng)力Lode角的變化而改變;偏應(yīng)力相等時(shí),ε1,ε2,ε3,εv及εs隨著偏應(yīng)力比M(q/p)的增大而呈現(xiàn)遞減趨勢(shì);球應(yīng)力相等時(shí),3個(gè)主應(yīng)變、體應(yīng)變及偏應(yīng)變隨著偏應(yīng)力比M的增大呈現(xiàn)先減小后增大的趨勢(shì),且在M較大時(shí)失穩(wěn)破壞。巖石破壞時(shí)形成多個(gè)近似垂直于σ3方向而平行于σ1,σ2方向的破壞面,且強(qiáng)度值較常規(guī)加載明顯偏小;偏應(yīng)力比M對(duì)偏應(yīng)變模量Gs有較大影響。球應(yīng)力主要影響巖石的體積變化,且有一定的區(qū)間性;偏應(yīng)力主要影響巖石的畸變,對(duì)巖石破壞起重要作用。試驗(yàn)砂巖的塑性變形受Lode角影響較大,塑形流動(dòng)方向?yàn)棣萻=(θσ + π/2)。
[Abstract]:Based on the "multifunctional true triaxial fluid-solid coupling test system", the Lode angle of stress is changed under the condition of true triaxial stress (蟽 1 蟽 2 蟽 3). The influence of stress Lode angle rotation on the deformation characteristics of rock is studied under the condition of spherical stress and deflection stress invariant. The results show that the three principal strain, bulk strain and deflection strain all change with the change of stress Lode angle. When the deflection stress is equal, 蔚 _ 1, 蔚 _ 2, 蔚 _ 3, 蔚 _ v and 蔚 _ s decrease with the increase of the deviation stress ratio (M ~ Q / p). When the spherical stress is equal, the three principal strains, the bulk strain and the deflection strain tend to decrease first and then increase with the increase of the deflection stress ratio M. When M is larger than M, there are many failure surfaces perpendicular to 蟽 3 and parallel to 蟽 1 and 蟽 2, and the strength is obviously smaller than that of conventional loading. The deflection stress ratio M has a great influence on the deviant strain modulus Gs. The spherical stress mainly affects the volume change of rock and has certain interval property. Deformation stress mainly affects rock distortion and plays an important role in rock failure. The plastic deformation of the tested sandstone is greatly affected by the Lode angle, and the plastic flow direction is 胃 sn (胃 蟽 蟺 / 2).
【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;重慶大學(xué)資源及環(huán)境科學(xué)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51434003,51374256)~~
【分類號(hào)】：TU45
【正文快照】： 巖石在應(yīng)力作用下的變形、強(qiáng)度等相關(guān)力學(xué)性質(zhì),一直是巖石力學(xué)試驗(yàn)研究的重點(diǎn)。但現(xiàn)有大量試驗(yàn)多是以圓柱體試樣在軸對(duì)稱應(yīng)力(1?2?=3?)條件下進(jìn)行的,因此忽略了中間主應(yīng)力2?的影響,這與實(shí)際地應(yīng)力狀況不相符[1]。隨著大量地下巷道、硐室、儲(chǔ)油庫(kù)、儲(chǔ)氣庫(kù)及核廢料庫(kù)等的興建,

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1 邵建國(guó);張小平;;論上部巖石圈的偏應(yīng)力值[J];地質(zhì)論評(píng);1991年04期

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