本文選題：應(yīng)力狀態(tài) + 粗顆粒材料�。� 參考：《工程科學(xué)與技術(shù)》2017年S1期

【摘要】：土石壩在運營過程中,不同部位往往處于不同的應(yīng)力水平。壩體在遭遇地震工況下,導(dǎo)致壩體內(nèi)部不同部位會產(chǎn)生不同的地震附加應(yīng)力,應(yīng)力狀態(tài)是影響粗顆粒材料動力特性的重要因素。為研究地震過程中應(yīng)力狀態(tài)的變化對壩體抗震性能的影響,本文開展不同圍壓、不同固結(jié)應(yīng)力比及不同動應(yīng)力條件下粗顆粒材料動力特性試驗研究工作。研究表明:不同圍壓下最大動彈性模量值隨著圍壓和固結(jié)應(yīng)力比的提高逐漸增大,隨著動應(yīng)變的增大呈逐漸衰減趨勢,衰減率隨著圍壓和固結(jié)應(yīng)力比的增加逐漸減慢;不同圍壓下阻尼比隨著動應(yīng)變的增大呈逐漸增大趨勢;隨著圍壓增加,阻尼比λ呈逐漸減小趨勢;各級圍壓下最大動彈性模量值及阻尼比值均比較分散,不能依靠動應(yīng)變對其進行歸一化描述。在相同圍壓和固結(jié)應(yīng)力比作用下,隨著動應(yīng)力的提高,動永久軸向變形和動永久體積均產(chǎn)生一定的增加;在相同圍壓和動應(yīng)力作用下,動永久軸向變形隨著固結(jié)應(yīng)力比的提高而增加,動永久體積變形隨著固結(jié)應(yīng)力比的提高而略有降低;在相同的固結(jié)應(yīng)力比和動應(yīng)力作用下,隨著圍壓的提高,動永久軸向變形和動永久體積均產(chǎn)生一定的增加;軸向動應(yīng)變幅值是不均勻的,一般開始幾周較大,后期會逐漸變小,在第10次循環(huán)左右,軸向動應(yīng)變幅值逐漸趨向于定值。
[Abstract]:In the operation of earth-rock dam, different parts are often in different stress levels. When the dam is subjected to earthquake conditions, different additional stresses will be produced in different parts of the dam body, and the stress state is an important factor affecting the dynamic characteristics of coarse granular materials. In order to study the effect of stress state change on seismic behavior of dam during earthquake, the dynamic characteristics of coarse granular materials under different confining pressures, different consolidation stress ratios and different dynamic stresses are studied experimentally in this paper. The results show that the maximum dynamic elastic modulus increases with the increase of confining pressure and consolidation stress ratio, and decreases with the increase of dynamic strain, and the attenuation rate decreases with the increase of confining pressure and consolidation stress ratio. Under different confining pressures, the damping ratio increases gradually with the increase of dynamic strain, and decreases with the increase of confining pressure, and the maximum dynamic elastic modulus and damping ratio are dispersed at different confining pressures. It can not be normalized by dynamic strain. Under the same confining pressure and consolidation stress ratio, dynamic permanent axial deformation and dynamic permanent volume increase with the increase of dynamic stress, and under the same confining pressure and dynamic stress, The dynamic permanent axial deformation increases with the increase of the consolidation stress ratio, the dynamic permanent volume deformation decreases slightly with the increase of the consolidation stress ratio, and under the same consolidation stress ratio and dynamic stress, the dynamic permanent volume deformation increases with the increase of the confining pressure. Both the dynamic permanent axial deformation and the dynamic permanent volume increase to a certain extent, and the amplitude of the axial dynamic strain is non-uniform, generally larger at the beginning of several weeks, and gradually smaller at the later stage. At the 10th cycle or so, the amplitude of the axial dynamic strain tends to be fixed gradually.
【作者單位】： 南京水利科學(xué)研究院;水利部土石壩破壞機理與防控技術(shù)重點實驗室;中國電建中南勘測設(shè)計研究院有限公司;
【基金】：國家自然科學(xué)基金重大研究計劃集成項目資助(91215301);國家自然科學(xué)基金重點資助項目(51539006);國家自然科學(xué)基金青年基金資助項目(51309161)
【分類號】：TV41

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