本文選題：極弱膠結(jié)巖體　切入點(diǎn)：結(jié)構(gòu)與力學(xué)特性　出處：《中國礦業(yè)大學(xué)》2014年博士論文

【摘要】：極弱膠結(jié)巖體是廣泛分布在我國西部礦區(qū)侏羅系、白堊系地層中的一類特殊軟巖，特殊的成巖環(huán)境和沉積過程，形成了其獨(dú)特的物理與力學(xué)性質(zhì)。由于在極弱膠結(jié)巖體的研究中存在一系列的難題，目前對(duì)極弱膠結(jié)巖體的基本物理力學(xué)性質(zhì)試驗(yàn)及本構(gòu)模型的相關(guān)研究涉及甚少。隨著西部礦井的大規(guī)模建設(shè)，極弱膠結(jié)地層巷道圍巖控制問題逐漸突出，亟需開展極弱膠結(jié)巖體的物理力學(xué)性質(zhì)試驗(yàn)與本構(gòu)模型方面的研究，對(duì)我國西部礦區(qū)的建設(shè)與安全生產(chǎn)具有重要現(xiàn)實(shí)意義和工程應(yīng)用價(jià)值。 本文以極弱膠結(jié)巖體為研究對(duì)象，綜合運(yùn)用巖體試驗(yàn)、理論分析、數(shù)值模擬等技術(shù)手段，研究了不同應(yīng)力狀態(tài)及含水率條件下極弱膠結(jié)巖體的物理與力學(xué)特性，揭示了圍巖再生結(jié)構(gòu)的形成過程及圍巖位移、塑性區(qū)與應(yīng)力分布的演化規(guī)律，構(gòu)建了極弱膠結(jié)巖體擴(kuò)容大變形本構(gòu)模型，分析了極弱膠結(jié)巖體擴(kuò)容大變形破壞機(jī)理，提出了極弱膠結(jié)地層巷道圍巖控制技術(shù)。 論文研究主要成果與進(jìn)展： （1）自主研制了極弱膠結(jié)巖體再生結(jié)構(gòu)形成試驗(yàn)裝置，確定了再生結(jié)構(gòu)巖樣分級(jí)加載與固結(jié)穩(wěn)定方法，形成了不同含水率極弱膠結(jié)巖體再生結(jié)構(gòu)巖樣，揭示了再生結(jié)構(gòu)巖樣的形成過程及結(jié)構(gòu)與力學(xué)特性。 （2）基于裂紋體積應(yīng)變模型，分析了極弱膠結(jié)巖體擴(kuò)容大變形破壞機(jī)理，反映了不同應(yīng)力狀態(tài)與含水率條件下極弱膠結(jié)巖體應(yīng)力-應(yīng)變曲線特性，揭示了巖體強(qiáng)度與擴(kuò)容參數(shù)隨等效塑性應(yīng)變及含水率變化的演化規(guī)律。 （3）建立了峰前損傷擴(kuò)容與峰后破裂擴(kuò)容屈服準(zhǔn)則，修正了Mohr-Coulomb準(zhǔn)則剪切與拉伸破壞區(qū)域的劃分條件，構(gòu)建了極弱膠結(jié)巖體擴(kuò)容大變形本構(gòu)模型，揭示了極弱膠結(jié)巖體峰后應(yīng)變軟化與擴(kuò)容變形特性。 （4）確定了極弱膠結(jié)巖體本構(gòu)模型的增量迭代格式，實(shí)現(xiàn)了極弱膠結(jié)巖體擴(kuò)容大變形本構(gòu)模型的二次開發(fā)，揭示了不同埋深、側(cè)壓力系數(shù)及剪脹角等條件下巷道圍巖位移、塑性區(qū)與應(yīng)力分布的演化規(guī)律。 （5）提出了應(yīng)用切圓拱形斷面與雙層錨固平衡拱結(jié)構(gòu)，基于煤層厚度與巷道埋深影響效應(yīng)，提出了極弱膠結(jié)地層回采巷道分類支護(hù)技術(shù)方案，揭示了巷道圍巖變形與支護(hù)結(jié)構(gòu)受力演化規(guī)律，，并成功應(yīng)用于工程實(shí)踐。
[Abstract]:The very weak cemented rock mass is a kind of special soft rock which is widely distributed in Jurassic and Cretaceous strata in western China. The special diagenetic environment and sedimentary process form its unique physical and mechanical properties.Due to a series of difficult problems in the study of very weak cemented rock mass, there is little research on the basic physical and mechanical properties of the very weak cemented rock mass and the related research on the constitutive model of the very weak cemented rock mass.With the large-scale construction of the west coal mine, the problem of controlling the surrounding rock of the roadway in the very weak cemented strata is becoming more and more serious. It is urgent to study the physical and mechanical properties of the very weak cemented rock mass and the constitutive model.It has important practical significance and engineering application value for the construction and safe production of mining area in western China.Taking the very weak cemented rock mass as the research object, the physical and mechanical properties of the very weak cemented rock mass under the condition of different stress states and moisture content are studied by means of rock mass test, theoretical analysis and numerical simulation.The forming process of surrounding rock regeneration structure and the evolution law of surrounding rock displacement, plastic zone and stress distribution are revealed. The constitutive model of dilatancy and large deformation of very weak cemented rock mass is constructed, and the failure mechanism of very weak cemented rock mass is analyzed.The control technology of surrounding rock of roadway in very weak cemented stratum is put forward.The main achievements and progress of this paper are as follows:In this paper, an experimental device for the formation of regenerative structure of very weak cemented rock mass has been developed. The method of graded loading and consolidation stability of recycled rock samples has been determined, and the rock samples with very weak cemented rock mass with different moisture content have been formed.The formation process, structure and mechanical properties of regenerated rock samples are revealed.(2) based on the crack volume strain model, the mechanism of dilatancy and large deformation of very weak cemented rock mass is analyzed, which reflects the stress-strain curve characteristics of very weak cemented rock mass under different stress states and water content.The evolution law of rock mass strength and expansion parameters with the change of equivalent plastic strain and water content is revealed.(3) the pre-peak damage expansion criterion and post-peak fracture expansion yield criterion are established, the Mohr-Coulomb criterion is modified to divide the shear and tensile failure regions, and the constitutive model of the dilatancy and large deformation of the very weak cemented rock mass is constructed.The characteristics of strain softening and expansion deformation after peak of very weak cemented rock mass are revealed.(4) the incremental iterative scheme of the constitutive model of very weak cemented rock mass is determined, the secondary development of the constitutive model of the very weak cemented rock mass with large deformation is realized, and the displacement of surrounding rock of roadway is revealed under the conditions of different burying depth, lateral pressure coefficient and shear-expansion angle, etc.The evolution of plastic zone and stress distribution.Based on the effect of coal seam thickness and roadway depth, this paper puts forward the technical scheme of classified support for mining roadway in very weak cemented strata, which is based on the application of tangential arch section and double-layer anchor balanced arch structure, based on the effect of coal seam thickness and roadway depth.The evolution law of surrounding rock deformation and supporting structure is revealed and successfully applied in engineering practice.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU452

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 布和朝魯;;內(nèi)蒙古煤炭資源開發(fā)現(xiàn)狀、問題與對(duì)策分析[J];北方經(jīng)濟(jì);2007年17期

2 劉艷英;;淺析內(nèi)蒙古煤炭資源開發(fā)利用中存在的問題及對(duì)策[J];赤峰學(xué)院學(xué)報(bào)(自然科學(xué)版);2008年03期

3 朱鳳賢;周翠英;;軟巖遇水軟化的耗散結(jié)構(gòu)形成機(jī)制[J];地球科學(xué)(中國地質(zhì)大學(xué)學(xué)報(bào));2009年03期

4 楊圣奇;徐衛(wèi)亞;蘇承東;;大理巖三軸壓縮變形破壞與能量特征研究[J];工程力學(xué);2007年01期

5 錢自衛(wèi);姜振泉;孫強(qiáng);朱術(shù)云;李東林;;深部煤系軟巖遇水崩解的宏觀特征及微觀機(jī)理研究[J];高校地質(zhì)學(xué)報(bào);2011年04期

6 蔣維;鄧建;司慶超;;基于Mohr準(zhǔn)則的巖石損傷本構(gòu)模型及其修正研究[J];河北工程大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年02期

7 孟慶彬;韓立軍;喬衛(wèi)國;林登閣;呂言新;;深部高應(yīng)力軟巖巷道變形破壞特性研究[J];采礦與安全工程學(xué)報(bào);2012年04期

8 周宏偉,謝和平,左建平;深部高地應(yīng)力下巖石力學(xué)行為研究進(jìn)展[J];力學(xué)進(jìn)展;2005年01期

9 張向東;傅強(qiáng);鄭曉峰;;煤礦泥巖流變模型辨識(shí)及支護(hù)方法的確定[J];力學(xué)與實(shí)踐;2011年02期

10 彭向峰;;我國煤礦軟巖的主要工程地質(zhì)性質(zhì)[J];煤田地質(zhì)與勘探;1992年05期

本文編號(hào)：1728187