【摘要】：隨著煤炭資源的深部開(kāi)采,采用斜井方式建設(shè)運(yùn)輸通道的方式被廣泛運(yùn)用。相比于傳統(tǒng)的礦山法修建煤礦斜井,盾構(gòu)/TBM工法安全程度高,施工速度快,采用盾構(gòu)/TBM工法修建煤礦長(zhǎng)距離斜井已成為當(dāng)前煤炭資源開(kāi)發(fā)的重要課題。本文依托神東補(bǔ)連塔煤礦斜井工程,針對(duì)煤礦斜井管片襯砌接頭力學(xué)性能開(kāi)展研究,主要的研究工作及成果如下:1.制作了兩組管片接頭構(gòu)件并布置了傳感器,對(duì)盾構(gòu)管片接頭分別進(jìn)行了正彎矩加載試驗(yàn)與負(fù)彎矩加載試驗(yàn)。探明了不同軸力作用下,彎矩對(duì)管片接頭張開(kāi)量、轉(zhuǎn)角以及接縫附近各表面混凝土應(yīng)變的影響規(guī)律。試驗(yàn)還對(duì)管片接頭進(jìn)行了破壞試驗(yàn),得到了在大軸力作用時(shí),管片接頭受彎破壞特點(diǎn),其破壞特性表現(xiàn)為混凝土首先壓碎破壞,螺栓變形量較小。2.以試驗(yàn)數(shù)據(jù)為基礎(chǔ),經(jīng)過(guò)數(shù)學(xué)變換,研究了不同軸力下,管片接頭抗彎剛度隨彎矩變化規(guī)律,并給出了不同軸力下抗彎剛度的取值范圍。同時(shí)采用有限元軟件,建立了三維有限元模型,研究了不同軸力作用下,管片接頭轉(zhuǎn)角隨彎矩變化關(guān)系,接頭抗彎剛度隨彎矩變化關(guān)系,并與試驗(yàn)結(jié)果進(jìn)行了對(duì)比分析,研究結(jié)果表明,有限元計(jì)算得到的抗彎剛度值小于試驗(yàn)結(jié)果。3.根據(jù)試驗(yàn)研究得到的管片接頭抗彎剛度值,提出了基于接頭抗彎剛度迭代的梁-彈簧模型。研究了接頭抗彎剛度對(duì)管片襯砌結(jié)構(gòu)內(nèi)力、位移的影響規(guī)律,接頭抗彎剛度增加,襯砌結(jié)構(gòu)內(nèi)力增大,位移減小。同時(shí)對(duì)比分析不同荷載組合下梁-彈簧模型與勻質(zhì)圓環(huán)模型計(jì)算結(jié)果的差異,梁-彈簧模型計(jì)算結(jié)果相對(duì)于勻質(zhì)圓環(huán)計(jì)算結(jié)果,彎矩較小,剪力、軸力、位移則較大。
[Abstract]:With the deep mining of coal resources, the construction of transportation passage by inclined well is widely used. Compared with the traditional mining method, the shield / TBM method is of high safety and fast construction speed. It has become an important subject of coal resource development to use shield / TBM method to build long distance inclined shaft in coal mine. Based on the inclined well engineering of Shendong Bulinta Coal Mine, this paper studies the mechanical properties of the lining joint of the inclined shaft segment in the coal mine. The main research work and results are as follows: 1. Two groups of segment joint members were made and sensors were arranged. The positive moment loading test and negative moment loading test of shield segment joint were carried out. The influence of bending moment on the opening and angle of segment joint and the strain of concrete on each surface near the joint was investigated under the action of different axial forces. The failure test of segment joint is also carried out, and the bending failure characteristics of segment joint under the action of large axial force are obtained. The failure characteristic of segment joint is first crushed concrete, and the deformation of bolt is small. 2. Based on the experimental data and mathematical transformation, the variation of bending stiffness of segment joints with bending moment under different axial forces is studied, and the value range of bending stiffness under different axial forces is given. At the same time, a three-dimensional finite element model is established by using the finite element software. The relationship between the angle of the segment joint and the moment and the bending stiffness of the joint with the bending moment are studied under different axial forces, and the results are compared with the experimental results. The results show that the bending stiffness calculated by finite element method is smaller than that of test. Based on the bending stiffness of segment joint, a beam-spring model based on flexural stiffness iteration is proposed. The influence of joint bending stiffness on the internal force and displacement of segment lining structure is studied. The bending stiffness of joint increases and the internal force of lining structure increases and the displacement decreases. At the same time, the difference between beam-spring model and homogeneous ring model under different load combinations is analyzed. The results of beam-spring model are smaller than those of homogeneous ring, and the bending moment is smaller, the shear force, axial force and displacement are larger.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD55

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