本文關(guān)鍵詞： 軟巖 非定常 非線性 蠕變 黏彈塑本構(gòu)　出處：《北京交通大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著西部大開(kāi)發(fā)政策的實(shí)施和經(jīng)濟(jì)建設(shè)步伐的加快,礦山、水電和交通等大型基礎(chǔ)設(shè)施建設(shè)如火如荼,深部軟巖建設(shè)工點(diǎn)越來(lái)越多,并引發(fā)了施工過(guò)程中圍巖持續(xù)性的蠕變大變形災(zāi)害,對(duì)工程的長(zhǎng)期穩(wěn)定性及運(yùn)營(yíng)期結(jié)構(gòu)安全性和使用壽命提出了嚴(yán)峻的挑戰(zhàn),依托國(guó)家自然科學(xué)基金面上項(xiàng)目“軟巖非定常分?jǐn)?shù)階微積分蠕變本構(gòu)模型及深部軟巖隧道施工圍巖大變形控制理論研究”,本文從實(shí)驗(yàn)及理論的角度研究軟弱巖石在長(zhǎng)期荷載作用下的蠕變特性,建立了能正確反映軟巖蠕變破壞全過(guò)程的本構(gòu)模型,取得了如下成果:(1)在蠕變實(shí)驗(yàn)過(guò)程中,由于蠕變損傷導(dǎo)致巖石的力學(xué)參數(shù)逐漸弱化。本文根據(jù)泥巖在不同蠕變時(shí)間、不同軸向應(yīng)力作用下的實(shí)驗(yàn)數(shù)據(jù),提出了泥巖彈性模量隨時(shí)間的衰減公式。(2)基于Maxwell模型,并考慮蠕變過(guò)程中彈模隨時(shí)間的衰減規(guī)律,建立了一種參數(shù)非定常的軟巖非線性黏彈塑性蠕變本構(gòu),并對(duì)模型參數(shù)進(jìn)行了辨識(shí)。該模型可以很好地描述單軸壓縮狀態(tài)下泥巖蠕變?nèi)^(guò)程,三維狀態(tài)下該蠕變模型對(duì)泥巖三軸壓縮蠕變曲線等速和加速蠕變階段實(shí)驗(yàn)結(jié)果描述不甚理想,該模型仍可以為以后的研究提供參考借鑒。(3)通過(guò)重新定義一個(gè)新的非線性黏壺元件,結(jié)合Bingham模型,本文提出了 一個(gè)基于改進(jìn)Bingham模型的軟巖參數(shù)非定常的一維非線性黏彈塑性流變本構(gòu),該本構(gòu)能準(zhǔn)確描述單軸壓縮蠕變下泥巖的衰減、穩(wěn)態(tài)和加速蠕變階段。(4)將所建立的基于改進(jìn)Bingham模型的蠕變本構(gòu)方程推廣到三維狀態(tài),并根據(jù)泥巖三軸蠕變?cè)囼?yàn)數(shù)據(jù)對(duì)該三維模型進(jìn)行了參數(shù)辨識(shí)和驗(yàn)證,模型計(jì)算結(jié)果與實(shí)驗(yàn)數(shù)據(jù)吻合地比較理想,證明了所建立的基于改進(jìn)Bingham模型的流變本構(gòu)方程的正確性與合理性。且參數(shù)相對(duì)較少,組合形式簡(jiǎn)單,參數(shù)易于辨識(shí),有利于在以后工程實(shí)踐中推廣應(yīng)用,具有重要實(shí)際意義。(5)將所建立的基于改進(jìn)Bingham模型的流變本構(gòu)與傳統(tǒng)Bingham模型、未考慮參數(shù)非定常的本模型、改進(jìn)的西原模型和河海模型在同等實(shí)驗(yàn)條件下進(jìn)行了對(duì)比,深入分析了本文所提新模型的特征和優(yōu)缺點(diǎn)。
[Abstract]:With the implementation of the western development policy and speed up the pace of economic development, mining, large-scale infrastructure construction like a raging fire of hydropower and transportation, construction of deep soft rock site more and more, and led to the construction process of rock creep persistent large deformation disasters, poses a severe challenge to the long-term stability and service life and operation the structure of safety engineering, relying on the National Natural Science Fund Project "on the surface of the unsteady fractional calculus creep constitutive model and deep soft rock tunnel surrounding rock of soft rock large deformation control theory, this paper studies the creep characteristics of soft rock under long-term loading from the experimental and theoretical point of view, to establish a to correctly reflect the constitutive model of soft rock creep damage, the achievements are as follows: (1) in the creep test, the creep damage caused due to rock mechanics parameters gradually fade . according to the mudstone under different creep time, different axial experimental data of the stress under the action of the proposed attenuation formula of mudstone elastic modulus with time. (2) based on the Maxwell model, and considering the creep process of shot mode attenuation with time, a non parameter nonlinear ordinary viscoelastic soft rock plastic creep constitutive model, and the parameters are identified. The model can well describe the whole process of mudstone creep under uniaxial compression, the creep model under 3D condition on the creep curve of mudstone and isokinetic three axial compression test results describe the accelerated creep stage is not ideal, the model can provide a reference the research for the future. (3) by redefining a new nonlinear dashpot element, combined with the Bingham model, this paper proposes a soft rock parameters based on improved Bingham model of unsteady one dimensional linear viscoelastic plasticity The rheological constitutive, the constitutive model can accurately describe the attenuation of mudstone under uniaxial compression creep, steady and accelerated creep stage. (4) will be established based on improved Bingham model of creep constitutive equation was applied to three-dimensional state, and according to the parameter identification and validation of the 3D model of three axis creep test data of mudstone and the calculation results of the model agree with the experimental data to prove the ideal, the rheological constitutive equation based on improved Bingham model is correct and reasonable. And the relatively few parameters, combined with simple form, easy parameter identification, favorable in the future engineering practice application, has important practical significance. (5) will the rheological constitutive model based on improved Bingham model and traditional Bingham model, the parameters of the unsteady model do not consider the Xiyuan model and the improved model of Hehai were compared under the same experimental conditions, The characteristics and advantages and disadvantages of the new model proposed in this paper are deeply analyzed.

【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU45

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