本文選題：路基工程 + 急傾斜采空區(qū)��； 參考：《長安大學(xué)》2015年碩士論文

【摘要】：近年來隨著國家經(jīng)濟(jì)的高速發(fā)展,礦產(chǎn)資源不斷開采,在新疆地區(qū)形成了大量的急傾斜采空區(qū)。隨著對基礎(chǔ)設(shè)施建設(shè)的投入不斷增大,高速公路建設(shè)迅速發(fā)展,不可避免的經(jīng)過急傾斜采空區(qū)。因此,對于高速公路下伏急傾斜采空區(qū)的變形移動(dòng)規(guī)律研究十分重要。但是,國內(nèi)外對于下伏急傾斜采空區(qū)與高速公路相互作用的研究還較少,理論尚不成熟。為了深入研究下伏急傾斜采空區(qū)對高速公路路基及各地層的變形移動(dòng)規(guī)律,依托新疆烏魯木齊繞城高速公路(東線)急傾斜煤層采空區(qū),采用理論研究、現(xiàn)場勘察、模型試驗(yàn)和數(shù)值模擬相結(jié)合的方法,分析比選急傾斜采空區(qū)勘察技術(shù),并對高速公路下伏急傾斜采空區(qū)路基穩(wěn)定性進(jìn)行研究,主要研究內(nèi)容如下:(1)針對新疆烏魯木齊繞城高速公路急傾斜煤層采空區(qū),通過對既有采空區(qū)勘察技術(shù)進(jìn)行比選,在現(xiàn)場采用高密度電法和瞬變電磁法進(jìn)行勘察,并對物探異常點(diǎn)進(jìn)行鉆孔驗(yàn)證,物探解釋結(jié)果與鉆孔結(jié)果吻合良好,得出高密度電法和瞬變電磁法對急傾斜采空區(qū)勘察具有良好的適用性。(2)依據(jù)相似理論與模型試驗(yàn),確定大比例尺物理模型試驗(yàn)的相似常數(shù)。通過對相似材料的物理力學(xué)性能試驗(yàn),確定可模擬第四系礫石層的相似材料配比為m土:m砂=1:2,ρ=2.0g/cm3,ω=10%,凡士林含量為6%;可模擬中風(fēng)化砂巖的相似材料配比為m土:m砂=2:1,ρ=2.2g/cm3,ω=10%。(3)根據(jù)理論研究和依托工程現(xiàn)場實(shí)際情況,選取第一合同段K23+220~K24+70的小窯采空區(qū),通過改變開采厚度和煤層傾角等影響因素,模擬不同試驗(yàn)工況,通過在模型土體中預(yù)埋測試元件并定期觀測土體豎向位移,利用試驗(yàn)數(shù)據(jù)繪制路基和地層的位移曲線,得出路基和地層變形移動(dòng)規(guī)律。(4)建立FLAC3D數(shù)值模型,監(jiān)測測點(diǎn)豎向位移,分析數(shù)值模擬結(jié)果,并通過對模型試驗(yàn)與數(shù)值模擬對比分析得出開采厚度、煤層傾角與上覆層厚度對急傾斜煤層采空區(qū)路基的穩(wěn)定影響,確定急傾斜采空區(qū)對路基和地層的影響規(guī)律。
[Abstract]:In recent years, with the rapid development of national economy, mineral resources have been continuously exploited, and a large number of steep goaf have been formed in Xinjiang. With the increasing investment in infrastructure construction and the rapid development of highway construction, it is inevitable to pass through steep goaf. Therefore, it is very important to study the law of deformation and movement of goaf under freeway. However, there are few researches on the interaction between goaf and highway at home and abroad, and the theory is still immature. In order to deeply study the law of deformation and movement of roadbed and strata of expressway in downhill steep goaf, relying on the goaf of steep coal seam of Urumqi Expressway (East Line) in Xinjiang, theoretical research and field investigation are adopted. Combined with model test and numerical simulation, this paper analyzes the investigation technology of goaf with steep inclination, and studies the stability of roadbed in goaf under freeway. The main research contents are as follows: (1) aiming at the goaf in steep inclined coal seam of Urumqi Expressway in Xinjiang, by comparing and selecting the survey technology of the existing goaf, the high density electric method and transient electromagnetic method are used in the field investigation. The results of geophysical exploration interpretation are in good agreement with the borehole results. It is concluded that the high density electric method and transient electromagnetic method have good applicability for the investigation of steep goaf. The similarity constant of large scale physical model test is determined. By testing the physical and mechanical properties of similar materials, It is determined that the ratio of similar materials that can simulate the Quaternary gravel layer is m: 1: 2, 蟻 = 2.0 g / cm ~ 3, 蠅 ~ (10) = 10 ~ 10 and Vaseline content = 6; the similar material ratio of simulated weathered sandstone is m soil: 1 / m sand, 蟻 ~ (2. 2) g / cm ~ (3), 蠅 10 路3). According to the actual situation of the project, the similar material ratio can be studied and supported according to the actual situation of the project. The small kiln goaf of K23 220~K24 70 in the first contract section is selected. By changing the influence factors such as mining thickness and coal seam inclination, the different test conditions are simulated, and the vertical displacement of the soil is observed periodically by burying the test elements in the model soil. The displacement curve of subgrade and stratum is drawn from test data, and the law of deformation and movement of subgrade and stratum is obtained. The FLAC3D numerical model is established to monitor the vertical displacement of measuring point and analyze the result of numerical simulation. The effects of mining thickness, dip angle of coal seam and thickness of overlying layer on the stability of roadbed in goaf of steeply inclined coal seam are obtained by comparison of model test and numerical simulation, and the influence law of steep goaf on roadbed and stratum is determined.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U412.2;U416.1

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