本文選題：鄧肯-張模型　切入點：應(yīng)力路徑　出處：《遼寧科技大學(xué)》2017年碩士論文

【摘要】：砂土等巖土類材料主要由大量的顆粒物質(zhì)所組成,在微觀上顆粒形狀、大小和位置隨機(jī)分布的不均勻性,反映在宏觀上則表現(xiàn)出壓硬性,剪脹與各向異性等力學(xué)性質(zhì)。對于砂土的力學(xué)性質(zhì)的研究方面盡管許多學(xué)者已經(jīng)做了大量的研究,但是尾礦砂在不同應(yīng)力路徑試驗下的力學(xué)特性的試驗研究還比較少。以鞍鋼集團(tuán)礦業(yè)公司大孤山選礦廠尾礦庫中砂為研究對象,通過三軸試驗研究了中砂在不同應(yīng)力路徑下應(yīng)力應(yīng)變關(guān)系的變化規(guī)律。開展的主要工作及其結(jié)論有:(1)論述和分析國內(nèi)外關(guān)于砂土及尾礦在不同應(yīng)力路徑下力學(xué)性能的研究現(xiàn)狀。(2)試驗采用SLB-1三軸儀,分別在不同圍壓下對大孤山尾礦庫中砂進(jìn)行不固結(jié)和固結(jié)的不排水三軸試驗,根據(jù)不同圍壓下的試驗數(shù)據(jù)繪制出應(yīng)力-應(yīng)變曲線以及應(yīng)力路徑曲線。在相同圍壓下,固結(jié)完成的中砂強(qiáng)度比未固結(jié)的強(qiáng)度提高較大,亦即固結(jié)度對中砂的強(qiáng)度影響比較顯著。并且同一應(yīng)力路徑的不同圍壓對中砂的強(qiáng)度是有影響的。在固結(jié)不排水應(yīng)力路徑試驗中,對不同圍壓下的孔隙水壓力隨軸應(yīng)變的變化亦是先增加到峰值,隨即下降并產(chǎn)生負(fù)壓。(3)利用SLB-1三軸系統(tǒng),設(shè)計中砂在不同應(yīng)力路徑下的試驗。通過室內(nèi)試驗,得到大孤山尾礦庫中砂的應(yīng)力-應(yīng)變曲線,分析得出三種應(yīng)力路徑均體現(xiàn)出應(yīng)變軟化特性,應(yīng)力路徑對中砂的強(qiáng)度與變形有明顯影響。在常規(guī)不排水三軸壓縮試驗中,對不同圍壓下的孔隙水壓力隨軸應(yīng)變的變化先增加到峰值,隨即下降。對于固結(jié)不排水三軸試驗會產(chǎn)生負(fù)壓。(4)計算了中砂在不同應(yīng)力路徑下的鄧肯張模型的參數(shù)。(5)中砂在等主應(yīng)力比路徑下應(yīng)力應(yīng)變曲線符合冪函數(shù)形式。
[Abstract]:Rock and soil materials, such as sand and soil, are mainly composed of a large number of granular materials. The inhomogeneity of random distribution of grain shape, size and position is reflected in macroscopic mechanical properties such as compression, dilatancy and anisotropy.Although many scholars have done a lot of research on the mechanical properties of sand, there are few experimental studies on the mechanical properties of tailings under different stress paths.The main work carried out and its conclusions are discussed and analyzed at home and abroad on the research status of the mechanical properties of sand and tailings under different stress paths. The SLB-1 triaxial instrument is used in the test.The unconsolidated and unconsolidated undrained triaxial tests of sand in Dagushan tailings reservoir were carried out under different confining pressures, and the stress-strain curves and stress path curves were drawn according to the test data under different confining pressures.Under the same confining pressure, the strength of the consolidated sand is higher than that of the unconsolidated sand, that is, the consolidation degree has a significant effect on the strength of the medium sand.And the different confining pressure of the same stress path has an effect on the strength of sand.In the consolidation undrained stress path test, the pore water pressure under different confining pressures increases to the peak at first, then decreases and produces negative pressure. 3) using the SLB-1 triaxial system, the test of sand under different stress paths is designed.Through laboratory tests, the stress-strain curves of sand in Dagushan tailings reservoir are obtained. The results show that the three stress paths all reflect the strain-softening characteristics, and the stress paths have obvious influence on the strength and deformation of the sand.In the conventional undrained triaxial compression test, the pore water pressure under different confining pressures increases to the peak at first and then decreases with the axial strain.For consolidation undrained triaxial test, the negative pressure is generated. 4) the parameters of Duncan-Chang model of medium sand under different stress paths are calculated. 5) the stress-strain curve of medium sand under iso-principal stress ratio paths is in accordance with the power function form.
【學(xué)位授予單位】：遼寧科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU441

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