本文選題：礦區(qū)道路 + 重載　； 參考：《中國(guó)礦業(yè)大學(xué)》2015年碩士論文

【摘要】：本文以礦區(qū)運(yùn)煤道路現(xiàn)狀為背景,結(jié)合礦區(qū)煤矸石資源豐富的條件,提出采用石灰、粉煤灰、水泥等結(jié)合料對(duì)煤矸石進(jìn)行改性,使其代替道路常規(guī)使用的基層、底基層,并使其能夠滿足礦區(qū)道路超重載的行車條件。本文通過將理論計(jì)算、改性煤矸石實(shí)驗(yàn)室試驗(yàn)以及數(shù)值模擬相結(jié)合的方法,得到了改性煤矸石處理路基時(shí)路基當(dāng)量回彈模量的變化規(guī)律、彎沉值在不同改性煤矸石底基層厚度及模量條件下的變化規(guī)律,并對(duì)煤矸石進(jìn)行了改性試驗(yàn),得到不同風(fēng)化程度下其物理力學(xué)參數(shù)的變化規(guī)律,基于試驗(yàn)結(jié)果建立有限元模型,在彎沉及應(yīng)力等效條件下對(duì)礦區(qū)重載道路進(jìn)行組合設(shè)計(jì),獲得了以下主要成果:(1)路基當(dāng)量回彈模量隨改性煤矸石處理層厚度及模量的增大而增大,但隨著其模量的增加,路基當(dāng)量回彈模量增加的趨勢(shì)逐漸變緩。得到路基當(dāng)量回彈模量增加到120MPa、150MPa、180MPa及200MPa時(shí),所需改性煤矸石處理層厚度及模量的組合。在路基當(dāng)量回彈模量及底基層一定時(shí),彎沉值隨輪壓的增加而增加,在路基當(dāng)量回彈模量及輪壓一定時(shí),彎沉值隨改性煤矸石底基層厚度的增大而減小,同時(shí)隨改性煤矸石底基層模量的增大而減小。得到基于彎沉等效條件下,路基當(dāng)量回彈模量取120MPa、150MPa、180MPa及200MPa時(shí),不同輪壓條件下所需改性煤矸石底基層的厚度與模量的組合設(shè)計(jì)依據(jù);(2)通過實(shí)驗(yàn)室試驗(yàn),得到改性煤矸石7d無側(cè)限抗壓強(qiáng)度,均滿足重載道路結(jié)構(gòu)層底基層填筑材料的要求。由試驗(yàn)結(jié)果可知,水泥穩(wěn)定煤矸石強(qiáng)度早期發(fā)展較快,增長(zhǎng)趨勢(shì)隨時(shí)間逐漸變緩,而石灰粉煤灰穩(wěn)定煤矸石強(qiáng)度早期強(qiáng)度發(fā)展較慢,后期強(qiáng)度增長(zhǎng)較快;得出采用不同風(fēng)化程度下的改性煤矸石處理路基時(shí),路基當(dāng)量回彈模量與處理層厚度及模量的關(guān)系,同時(shí)利用劈裂試驗(yàn)得到其粘聚力和內(nèi)摩擦角,為有限元分析提供必要的物理參數(shù);(3)利用ANSYS有限元軟件,在彎沉等效的條件下,在采用改性煤矸石處理路基基礎(chǔ)上,改性煤矸石做底基層時(shí)優(yōu)化道路結(jié)構(gòu)層與原道路結(jié)構(gòu)層各層的彎拉應(yīng)力進(jìn)行了分析。通過分析可知,優(yōu)化道路結(jié)構(gòu)層各層彎拉應(yīng)力均小于原道路結(jié)構(gòu)層各層彎拉應(yīng)力,并得到將路基當(dāng)量回彈模量提高后,在彎沉及應(yīng)力等效條件下,改性煤矸石底基層厚度及模量組合不同時(shí)道路結(jié)構(gòu)所能承受的最大荷載;(4)通過有限元分析,提出了在不同輪壓條件下礦區(qū)重載道路的設(shè)計(jì)依據(jù)。
[Abstract]:In this paper, the coal gangue is modified with lime, fly ash, cement and other binders to replace the basic course and the bottom base, which are used in the road, based on the present situation of coal transportation road in the mining area and the condition of abundant coal gangue resources in the mining area, such as lime, fly ash, cement and so on. It can satisfy the driving condition of road overload in mining area. Through the combination of theoretical calculation, laboratory test of modified coal gangue and numerical simulation, the variation law of equivalent modulus of resilience of roadbed treated by modified gangue is obtained in this paper. The variation law of deflection value under the condition of different thickness and modulus of coal gangue base is studied, and the change law of physical and mechanical parameters of coal gangue under different weathering degree is obtained. The finite element model is established based on the test results. Under the condition of deflection and equivalent stress, the main results are as follows: (1) the equivalent elastic modulus of roadbed increases with the thickness and modulus of the modified coal gangue treatment layer, but increases with the increase of its modulus. The increasing trend of the equivalent modulus of resilience of subgrade gradually becomes slower. When the equivalent modulus of resilience of roadbed is increased to 120 MPA and 200 MPA, the thickness and modulus of the modified coal gangue treatment layer are obtained. The deflection value increases with the increase of the wheel pressure when the equivalent modulus of springback of the subgrade and the base of the subgrade are fixed, and the deflection value decreases with the increase of the thickness of the base of the modified coal gangue when the equivalent modulus of springback and the wheel pressure of the roadbed are fixed. At the same time, the modulus of the modified coal gangue base decreases with the increase of the base modulus. Under the equivalent condition of deflection, when the equivalent modulus of resilience of roadbed is 120 MPA ~ 150 MPA ~ 180 MPA and 200 MPA, the combined design basis of thickness and modulus of modified coal gangue base is obtained under different wheel compression conditions. (2) through laboratory test, The unconfined compressive strength of modified coal gangue for 7 days is obtained, which can meet the requirements of filling materials for the base course of heavy load road structure layer. According to the test results, the strength of cement stabilized gangue develops rapidly in the early stage, and the increasing trend becomes slower with time, while the strength of coal gangue stabilized by lime and fly ash develops slowly at the early stage and the strength increases faster at the later stage. The relationship between the equivalent resilience modulus of roadbed and the thickness and modulus of the treated layer is obtained when the modified coal gangue is used to treat the roadbed with different weathering degree. The cohesion and internal friction angle of the roadbed are obtained by splitting test. It provides necessary physical parameters for finite element analysis. (3) using ANSYS finite element software, under the condition of equivalent deflection, on the basis of using modified coal gangue to treat roadbed, The bending tensile stress of the road structure layer and the original road structure layer is analyzed when the modified coal gangue is used as the base course. The results show that the bending tensile stress of each layer of the optimized road structure layer is smaller than that of the original road structure layer, and the equivalent elastic modulus of the roadbed can be increased under the condition of deflection and equivalent stress. The maximum load that the road structure can bear when the thickness and modulus of the modified coal gangue base is different; (4) through the finite element analysis, the design basis of heavy load road in mining area under different wheel compression conditions is put forward.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U421.6;U414

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