發(fā)布時間：2018-11-29 12:43

【摘要】：混凝土作為軍事和民用工程中應(yīng)用最為廣泛的建筑材料,其抗侵徹問題的研究具有重要意義。約束混凝土的抗侵徹能力優(yōu)于無約束混凝土,然而目前有關(guān)約束混凝土抗侵徹性能和機理的研究較少。本文基于現(xiàn)有混凝土侵徹試驗,采用理論分析和數(shù)值模擬相結(jié)合的方法,開展了剛性彈侵徹約束混凝土厚靶問題研究,為約束混凝土在遮彈結(jié)構(gòu)中的應(yīng)用提供了理論支撐,具有重要的理論意義和應(yīng)用價值。本文主要內(nèi)容如下:1、提出了一個剛性彈侵徹半無限混凝土靶工程模型。針對Mohr-Coulomb屈服準(zhǔn)則和Griffith準(zhǔn)則的局限性,提出了粉碎區(qū)混凝土采用Hoek-Brown準(zhǔn)則的空腔膨脹模型,得到了靜阻力的解析解,建立了新的半無限混凝土侵徹深度工程模型。與現(xiàn)有典型侵徹試驗和侵徹深度公式對比表明:本文提出的基于Hoek-Brown準(zhǔn)則的球腔公式普適性較好,且在理論性上更具優(yōu)勢。2、建立了約束混凝土的準(zhǔn)靜態(tài)柱形和球形空腔膨脹理論�；趶较蚴軓椥约s束的有限直徑模型和Hoek-Brown準(zhǔn)則,得到了約束混凝土柱形和球形空腔準(zhǔn)靜態(tài)膨脹的解析解。通過算例,分析了空腔膨脹過程以及各影響因素,結(jié)果表明:約束混凝土的空腔膨脹過程不同于半無限混凝土介質(zhì),其空腔壁壓力在膨脹過程中不斷變化,約束剛度越大,對應(yīng)的壓力值越大,且約束效應(yīng)對低強度混凝土的作用更明顯。3、分析了約束混凝土抗長桿彈侵徹機理。運用ANSYS/LS-DYNA有限元軟件,對文獻長桿彈侵徹混凝土靶試驗進行了數(shù)值模擬,確定了合理的數(shù)值模型和參數(shù);變化撞擊速度和鋼管約束混凝土厚靶半徑、鋼管壁厚,深入分析了鋼管約束混凝土抗長桿彈侵徹機理。結(jié)果表明,提高約束剛度可有效減小侵徹深度,但是當(dāng)鋼管壁厚或靶徑大到一定程度時,約束剛度對侵徹深度影響不大。另外,在隧道侵徹階段,侵徹阻力基本為常數(shù),且與撞擊速度關(guān)系并不密切。4、分別建立了硬芯槍彈和剛性長桿彈侵徹約束混凝土工程模型。將約束混凝土空腔膨脹理論解應(yīng)用于硬芯槍彈侵徹約束混凝土厚靶,得到了硬芯槍彈侵徹深度預(yù)測公式�；陂L桿彈侵徹約束混凝土靶的數(shù)值模擬,建立了剛性長桿彈侵徹有限直徑約束混凝土厚靶侵徹深度公式,公式計算侵深與數(shù)值模擬值吻合較好。
[Abstract]:As the most widely used building material in military and civil engineering, it is of great significance to study the penetration resistance of concrete. The penetration resistance of confined concrete is better than that of unconfined concrete. However, there are few researches on the anti-penetration performance and mechanism of confined concrete. In this paper, based on the existing concrete penetration test, the problem of rigid projectile penetrating the confined concrete thick target is studied by combining theoretical analysis and numerical simulation, which provides a theoretical support for the application of confined concrete in the projectile structure. It has important theoretical significance and application value. The main contents of this paper are as follows: 1. A rigid projectile penetrating semi-infinite concrete target engineering model is proposed. In view of the limitation of Mohr-Coulomb yield criterion and Griffith criterion, a cavity expansion model of concrete in comminuted area using Hoek-Brown criterion is proposed. The analytical solution of static resistance is obtained, and a new engineering model of penetration depth of semi-infinite concrete is established. The comparison with the typical penetration test and penetration depth formula shows that the spherical cavity formula proposed in this paper based on Hoek-Brown criterion has better universality and has more theoretical advantages. 2. The expansion theory of quasi-static cylindrical and spherical cavity for confined concrete is established. Based on the finite diameter model with radial elastic constraints and the Hoek-Brown criterion, the analytical solutions of quasi-static expansion of confined concrete cylindrical and spherical cavities are obtained. The results show that the expansion process of confined concrete is different from that of semi-infinite concrete medium, and the wall pressure of the cavity is constantly changing during the expansion process, and the constraint stiffness is greater. The higher the corresponding pressure value, the more obvious the effect of constraint effect on low strength concrete. 3. The mechanism of resisting long rod projectile penetration of confined concrete is analyzed. By using ANSYS/LS-DYNA finite element software, the numerical simulation of long rod projectile penetrating concrete target is carried out, and the reasonable numerical model and parameters are determined. The mechanism of resisting long rod projectile penetration of steel tube confined concrete is deeply analyzed by changing the impact velocity, the thick target radius of concrete confined by steel tube and the wall thickness of steel tube. The results show that the penetration depth can be reduced effectively by increasing the restrained stiffness, but when the wall thickness of the steel pipe or the target diameter is large to a certain extent, the constraint stiffness has little effect on the penetration depth. In addition, in the tunnel penetration stage, the penetration resistance is basically constant and does not have a close relationship with the impact velocity. 4. The engineering models of the hard core projectile and the rigid long rod projectile penetrating the confined concrete are established respectively. In this paper, the expansion theory of confined concrete cavity is applied to the penetration of hard core projectile into confined concrete thick target, and the prediction formula of penetration depth of hard core projectile is obtained. Based on the numerical simulation of long rod projectile penetrating confined concrete target, the penetration depth formula of rigid long rod projectile penetrating finite diameter confined concrete thick target is established. The calculated penetration depth is in good agreement with the numerical simulation value.
【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU528

【參考文獻】

相關(guān)期刊論文 前10條

1 甄明;蔣志剛;萬帆;劉飛;譚清華;;鋼管約束混凝土抗侵徹性能試驗[J];國防科技大學(xué)學(xué)報;2015年03期

2 蔣志剛;甄明;劉飛;譚清華;宋殿義;;鋼管約束混凝土抗侵徹機理的數(shù)值模擬[J];振動與沖擊;2015年11期

3 彭永;方秦;吳昊;龔自明;孔祥振;;對彈體侵徹混凝土靶體阻力函數(shù)計算公式的探討[J];工程力學(xué);2015年04期

4 李衛(wèi)寧;徐金俊;陳宗平;;方鋼管再生混凝土的界面力學(xué)行為研究[J];建筑技術(shù);2015年01期

5 陳宗平;柯曉軍;陳宇良;;鋼管約束再生混凝土柱的變形性能及承載力計算[J];應(yīng)用力學(xué)學(xué)報;2014年06期

6 E.Hoek;C.D.Martin;;Fracture initiation and propagation in intact rock—A review[J];Journal of Rock Mechanics and Geotechnical Engineering;2014年04期

7 劉德穩(wěn);譚平;周福霖;李祥秀;李洋;范世凱;;核電站工程防災(zāi)減災(zāi)研究[J];災(zāi)害學(xué);2014年02期

8 賴建中;朱耀勇;徐升;過旭佳;;超高性能水泥基復(fù)合材料抗多次侵徹性能研究[J];爆炸與沖擊;2013年06期

9 胡瑞;汪劍輝;王天運;顏海春;林大路;季新年;;高含量混雜鋼纖維高強混凝土抗侵徹性能試驗研究[J];混凝土;2013年10期

10 柯曉軍;陳宗平;薛建陽;蘇益聲;;方鋼管再生混凝土短柱軸壓承載性能試驗研究[J];工程力學(xué);2013年08期

相關(guān)碩士學(xué)位論文 前4條

1 萬帆;鋼管約束混凝土抗侵徹性能與機理研究[D];國防科學(xué)技術(shù)大學(xué);2014年

2 甄明;有限空腔膨脹理論及約束混凝土抗侵徹機理研究[D];國防科學(xué)技術(shù)大學(xué);2013年

3 王建剛;子彈侵徹鋼筋混凝土的數(shù)值模擬研究[D];國防科學(xué)技術(shù)大學(xué);2011年

4 張建斌;基于ANSYS/LS-DYNA的彈頭侵徹問題分析與研究[D];西安電子科技大學(xué);2009年

，

本文編號：2365026