本文選題：層狀巖體 + 非對(duì)稱變形�。� 參考：《昆明理工大學(xué)》2015年碩士論文

【摘要】：層狀巖體是世界上分布較為廣泛的一種巖體,具有層狀構(gòu)造的巖體大約占到陸地面積的2/3,我國(guó)層狀巖體占陸地面積為77.3%。層狀巖體由于受到層理構(gòu)造的影響,具有正交各向異性或橫觀各向同性的特征,破壞形式與均質(zhì)巖體有很大不同。本文依托于馳宏鋅鍺公司永昌鉛鋅礦860坑550中段巷道,結(jié)合現(xiàn)場(chǎng)調(diào)查、理論分析、相似模擬實(shí)驗(yàn)及數(shù)值模擬等研究手段,針對(duì)巷道圍巖的變形破壞特征、力學(xué)特性和巷道破壞過(guò)程進(jìn)行研究。同時(shí)對(duì)傾斜薄層狀圍巖巷道的失穩(wěn)機(jī)理,選擇施工技術(shù)上相對(duì)合理,經(jīng)濟(jì)上切實(shí)可行的支護(hù)方式,并對(duì)此類巷道變形控制有普遍的適用性和實(shí)踐意義。本文主要研究?jī)?nèi)容如下：(1)通過(guò)對(duì)860坑550中段巷道的工程地質(zhì)、水文地質(zhì)進(jìn)行調(diào)查,了解了860坑的地層巖性、地質(zhì)構(gòu)造以及巷道圍巖巖性,并對(duì)具有層狀特征的巷道圍巖破壞形式進(jìn)行了描述。(2)對(duì)目前層狀巖體的破壞機(jī)理的理論和層狀圍巖巷道的失穩(wěn)判據(jù)進(jìn)行了總結(jié)歸納。(3)通過(guò)對(duì)相似理論學(xué)習(xí),對(duì)實(shí)驗(yàn)室原有的相似模擬實(shí)驗(yàn)臺(tái)進(jìn)行改造,增加能夠模擬上覆巖層壓力的上部加壓設(shè)備。其次進(jìn)行相似材料配比實(shí)驗(yàn),選擇在重度、抗壓強(qiáng)度、彈模、泊松比上與原型通過(guò)相似比縮小后力學(xué)性質(zhì)最為相近的相似材料,并采用正交設(shè)計(jì)法對(duì)相似材料力學(xué)性質(zhì)的影響因素進(jìn)行分析,從而選取了與原型按比例縮小后力學(xué)性質(zhì)最為相似的材料。(4)通過(guò)相似模擬實(shí)驗(yàn)研究,分析了巷道的破壞過(guò)程、破壞形式和巷道圍巖在受壓過(guò)程中的位移變化規(guī)律,從而更加直觀的掌握了傾斜薄層狀巷道圍巖的破壞過(guò)程與巷道圍巖破壞的關(guān)鍵位置。其次運(yùn)用數(shù)值模擬對(duì)巷道的受力情況等進(jìn)行分析,綜合分析巷道的變形、失穩(wěn)原因。(5)針對(duì)傾斜薄層狀圍巖巷道特殊的失穩(wěn)機(jī)理,運(yùn)用“長(zhǎng)短錨桿組合支護(hù)方案”。并采用數(shù)值模擬對(duì)支護(hù)方案進(jìn)行驗(yàn)證,并在驗(yàn)證的基礎(chǔ)上,對(duì)長(zhǎng)短錨桿組合支護(hù)方案進(jìn)行再次優(yōu)化設(shè)計(jì)。
[Abstract]:Layered rock mass is a widely distributed rock mass in the world. The rock mass with layered structure accounts for about 2 / 3 of the land area, and the stratiform rock mass occupies 77.3% of the land area in China. The layered rock mass is characterized by orthotropic or transversely isotropic due to the influence of bedding structure, and the failure form is quite different from that of homogeneous rock mass. Based on the roadway of 860keng 550 in Yongchang Pb-Zn Mine of Chihong Zinc and Germanium Company, combined with field investigation, theoretical analysis, similar simulation experiment and numerical simulation, this paper aims at the deformation and failure characteristics of roadway surrounding rock. Mechanical properties and roadway failure process were studied. At the same time, the mechanism of instability of inclined and thin-layer surrounding rock roadway is chosen, which is relatively reasonable in construction technology and feasible in economy, and has universal applicability and practical significance for deformation control of this kind of roadway. The main contents of this paper are as follows: (1) through the investigation of engineering geology and hydrogeology of the middle section of the 860keng 550 section, the stratigraphic lithology, geological structure and lithology of the surrounding rock of the tunnel are understood. The failure form of roadway surrounding rock with layered characteristics is described. (2) the theory of failure mechanism of layered rock mass and the instability criterion of layered rock roadway are summarized and summarized. 3) the similarity theory is studied. The original similar simulative test bench was modified to increase the upper pressure equipment which can simulate the pressure of overlying strata. Secondly, the similar material ratio was tested, and the similar materials with the most similar mechanical properties were selected on the degree of weight, compressive strength, modulus of elasticity, Poisson's ratio and the prototype after the similarity ratio was reduced. The influence factors of the mechanical properties of similar materials are analyzed by orthogonal design method, and the most similar material to the prototype is selected. The failure process of the roadway is analyzed through the similar simulation experiment study, which is most similar to the mechanical properties of the prototype. The failure form and displacement of roadway surrounding rock in the process of compression, thus more intuitively grasped the destruction process of inclined and thin-layer roadway and the key position of roadway surrounding rock failure. Secondly, numerical simulation is used to analyze the stress of roadway, and the deformation of roadway is analyzed synthetically. The reason of instability is. 5) according to the special instability mechanism of inclined and thin-bed surrounding rock roadway, "long and short bolt combination support scheme" is used. Numerical simulation is used to verify the support scheme, and on the basis of verification, the combined support scheme of long and short bolt is optimized again.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD322.4;TD353

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本文編號(hào)：1967494