大孤山尾礦中砂力學特性研究
本文選題:鄧肯-張模型 切入點:應力路徑 出處:《遼寧科技大學》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所組成,在微觀上顆粒形狀、大小和位置隨機分布的不均勻性,反映在宏觀上則表現出壓硬性,剪脹與各向異性等力學性質。對于砂土的力學性質的研究方面盡管許多學者已經做了大量的研究,但是尾礦砂在不同應力路徑試驗下的力學特性的試驗研究還比較少。以鞍鋼集團礦業(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力路徑下應力應變關系的變化規(guī)律。開展的主要工作及其結論有:(1)論述和分析國內外關于砂土及尾礦在不同應力路徑下力學性能的研究現狀。(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行不固結和固結的不排水三軸試驗,根據不同圍壓下的試驗數據繪制出應力-應變曲線以及應力路徑曲線。在相同圍壓下,固結完成的中砂強度比未固結的強度提高較大,亦即固結度對中砂的強度影響比較顯著。并且同一應力路徑的不同圍壓對中砂的強度是有影響的。在固結不排水應力路徑試驗中,對不同圍壓下的孔隙水壓力隨軸應變的變化亦是先增加到峰值,隨即下降并產生負壓。(3)利用SLB-1三軸系統,設計中砂在不同應力路徑下的試驗。通過室內試驗,得到大孤山尾礦庫中砂的應力-應變曲線,分析得出三種應力路徑均體現出應變軟化特性,應力路徑對中砂的強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變的變化先增加到峰值,隨即下降。對于固結不排水三軸試驗會產生負壓。(4)計算了中砂在不同應力路徑下的鄧肯張模型的參數。(5)中砂在等主應力比路徑下應力應變曲線符合冪函數形式。
[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.
【學位授予單位】:遼寧科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TU441
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