本文選題：峰后碎裂圍巖 + 應(yīng)變能密度理論��； 參考：《山東大學(xué)》2015年碩士論文

【摘要】：隧道施工建設(shè)前期的初期支護(hù),作為整個(gè)施工工序極為重要的一環(huán),國內(nèi)的研究尚處于經(jīng)驗(yàn)指導(dǎo)施工階段,缺乏相關(guān)的工程問題研究,尤其是峰后碎裂圍巖條件下配套的隧道建設(shè)初期支護(hù)研究。對于峰后碎裂圍巖破壞機(jī)理的認(rèn)識問題,已引起巖土工程領(lǐng)域?qū)W者們的濃厚興趣。同時(shí),相應(yīng)的隧道初期支護(hù)對策以及最優(yōu)化,也成為工程技術(shù)領(lǐng)域急需解決的一個(gè)工程難題。本文從峰后碎裂圍巖體大變形導(dǎo)致初期支護(hù)噴射混凝土破裂這一工程現(xiàn)場問題需求出發(fā),從能量平衡的角度,對峰后碎裂巖體的破壞變形特性進(jìn)行研究。根據(jù)巖體裂隙發(fā)生及破壞過程中,整個(gè)圍巖系統(tǒng)能量的變化來判斷研究對象圍巖體的穩(wěn)定性,更好的解釋峰后碎裂圍巖變形破壞的內(nèi)在機(jī)制。本文從峰后裂隙圍巖局部大變形導(dǎo)致初期支護(hù)噴射混凝土破壞這一工程現(xiàn)場問題需求出發(fā),基于應(yīng)變能密度理論研究,借助于UDEC數(shù)值模擬工具,以塑鋼纖維噴射混凝土中心，結(jié)合室內(nèi)試驗(yàn)和工程現(xiàn)場試驗(yàn),試探性研究峰后碎裂巖體的變形破壞特性及塑鋼纖維噴射混凝土在初期支護(hù)中支護(hù)作用。本文的主要研究內(nèi)容可分為以下四點(diǎn)：1、以受工程開挖影響圍巖松動圈中的峰后碎裂巖體為研究對象,從能量轉(zhuǎn)換的角度出發(fā),基于應(yīng)變能密度理論, 把巖石的全應(yīng)力應(yīng)變曲線分為兩種類型,統(tǒng)一地用數(shù)學(xué)公式解釋其能量轉(zhuǎn)換關(guān)系,并進(jìn)一步提出適用于峰后碎裂圍巖變形破壞的能量判別準(zhǔn)則。2、通過Fish語言編程,把應(yīng)變能密度理論以破壞準(zhǔn)則的形式引入U(xiǎn)DEC數(shù)值模擬軟件,實(shí)現(xiàn)了峰后碎裂巖體從局部破壞到完全破壞的整個(gè)損傷演化過程的數(shù)值模擬分析。通過巖體試件的室內(nèi)試驗(yàn)與改進(jìn)后的數(shù)值模擬結(jié)果對比,驗(yàn)證改進(jìn)后UDEC程序的科學(xué)有效性,為下一步的研究塑鋼纖維噴射混凝土的支護(hù)作用優(yōu)必選提供支持。3、在室內(nèi)試驗(yàn)的基礎(chǔ)上,提出一種新型吸能型塑鋼纖維噴射混凝土材料,對塑鋼纖維噴射混凝土進(jìn)行優(yōu)化配比,選定最優(yōu)塑鋼纖維摻量和纖維長度,并給出其必要的力學(xué)性能參數(shù)。利用改進(jìn)的UDEC數(shù)值模擬軟件研究新型塑鋼纖維噴射混凝土在碎裂峰后圍巖體條件下的支護(hù)特性。4、結(jié)合工程現(xiàn)場原位試驗(yàn),改進(jìn)噴射混凝土施工工藝,提出一種新型分離式噴混施工工藝,并對塑鋼纖維噴射混凝土作為初期支護(hù)的效果進(jìn)行評價(jià)分析,確定其噴層的最優(yōu)厚度。
[Abstract]:As an important part of the whole construction process, the initial support in the early stage of tunnel construction construction is still in the stage of experience guiding construction, and there is a lack of research on related engineering problems. Especially the initial supporting research of tunnel construction under the condition of fractured surrounding rock after peak. The understanding of the failure mechanism of the post-peak fractured surrounding rock has aroused great interest of the scholars in the field of geotechnical engineering. At the same time, the corresponding initial supporting countermeasures and optimization of tunnel have become an urgent engineering problem in the field of engineering technology. In this paper, from the point of view of energy balance, the failure and deformation characteristics of post-peak fractured rock mass are studied from the point of view of the field problem of the initial support shotcrete rupture caused by the large deformation of the surrounding rock mass after the peak. According to the change of energy of the whole surrounding rock system during the occurrence and failure of rock fracture, the stability of the surrounding rock body is judged, and the internal mechanism of the deformation and failure of the fractured surrounding rock after the peak is better explained. In this paper, based on the research of strain energy density theory and UDEC numerical simulation tool, the center of plastic-steel fiber sprayed concrete is developed according to the demand of local large deformation of post-peak fissure surrounding rock which results in the initial support shotcrete destruction, which is based on the theory of strain energy density. Combined with laboratory tests and engineering field tests, the deformation and failure characteristics of post-peak fractured rock mass and the support function of plastic-steel fiber shotcrete in the initial support are studied tentatively. The main research contents of this paper can be divided into the following four points: 1. Taking the post-peak fractured rock mass in the loosening zone of surrounding rock affected by engineering excavation as the research object, from the point of view of energy conversion, Based on the theory of strain energy density, the total stress-strain curve of rock is divided into two types. Furthermore, the energy criterion. 2, which is suitable for the deformation and failure of post-peak fractured surrounding rock, is proposed. The strain energy density theory is introduced into the UDEC numerical simulation software in the form of failure criterion through Fish programming. Numerical simulation analysis of the whole damage evolution process from local failure to complete failure of post-peak fractured rock mass is carried out. The scientific validity of the improved UDEC program is verified by comparing the laboratory test of rock mass samples with the results of the improved numerical simulation. In order to study the supporting function of plastic-fiber sprayed concrete in the next step. 3. On the basis of indoor test, a new type of plastic-steel fiber sprayed concrete material is put forward to optimize the proportion of plastic-steel fiber sprayed concrete. The optimum fiber content and fiber length are selected and the necessary mechanical properties are given. By using the improved UDEC numerical simulation software, the supporting characteristics of new type plastic-steel fiber sprayed concrete under the condition of surrounding rock mass after the crack peak are studied. Combined with the in-situ test of the project, the construction technology of the sprayed concrete is improved. In this paper, a new type of separate shotcrete construction technology is put forward, and the effect of plastic-steel fiber shotcrete as initial support is evaluated and analyzed, and the optimum thickness of the spray layer is determined.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.7

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