本文關鍵詞： 巖石力學 真三軸應力 球應力 偏應力 變形 應力Lode角　出處：《巖石力學與工程學報》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系統(tǒng)",進行真三軸應力(σ1σ2σ3)條件下,保持球應力、偏應力不變而改變應力Lode角試驗,研究了球應力、偏應力不變條件下,應力Lode角旋轉對巖石變形特性的影響。結果表明:3個主應變、體應變及偏應變均隨應力Lode角的變化而改變;偏應力相等時,ε1,ε2,ε3,εv及εs隨著偏應力比M(q/p)的增大而呈現(xiàn)遞減趨勢;球應力相等時,3個主應變、體應變及偏應變隨著偏應力比M的增大呈現(xiàn)先減小后增大的趨勢,且在M較大時失穩(wěn)破壞。巖石破壞時形成多個近似垂直于σ3方向而平行于σ1,σ2方向的破壞面,且強度值較常規(guī)加載明顯偏小;偏應力比M對偏應變模量Gs有較大影響。球應力主要影響巖石的體積變化,且有一定的區(qū)間性;偏應力主要影響巖石的畸變,對巖石破壞起重要作用。試驗砂巖的塑性變形受Lode角影響較大,塑形流動方向為θs=(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】： 重慶大學煤礦災害動力學與控制國家重點實驗室;重慶大學資源及環(huán)境科學學院;
【基金】：國家自然科學基金資助項目(51434003,51374256)~~
【分類號】：TU45
【正文快照】： 巖石在應力作用下的變形、強度等相關力學性質(zhì),一直是巖石力學試驗研究的重點。但現(xiàn)有大量試驗多是以圓柱體試樣在軸對稱應力(1?2?=3?)條件下進行的,因此忽略了中間主應力2?的影響,這與實際地應力狀況不相符[1]。隨著大量地下巷道、硐室、儲油庫、儲氣庫及核廢料庫等的興建,

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

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