本文選題：煤破壞 + 蠕變��； 參考：《遼寧工程技術(shù)大學(xué)》2015年碩士論文

【摘要】：流變特性是軟巖的一項(xiàng)重要的力學(xué)性質(zhì),尤其在煤礦開采過程中,地表災(zāi)害顯現(xiàn)具有滯后性,具有時(shí)間效應(yīng),表現(xiàn)為蠕變特性；而開采導(dǎo)致煤層覆巖產(chǎn)生裂隙,當(dāng)雨天地表積蓄水之后,雨水便會(huì)滲透進(jìn)煤層中,導(dǎo)致煤的力學(xué)性質(zhì)發(fā)生改變,導(dǎo)致地表塌陷、巨洞或滑坡事故。故進(jìn)行煤峰前峰后的蠕變-滲流耦合規(guī)律試驗(yàn)研究有著很重要的工程意義。論文應(yīng)用試驗(yàn)研究和理論分析的方法,對煤峰前峰后的蠕變-滲流規(guī)律進(jìn)行了研究,其內(nèi)容為：1、自主研發(fā)三軸蠕變-滲流試驗(yàn)系統(tǒng),包括：加載系統(tǒng),穩(wěn)壓系統(tǒng)、監(jiān)測系統(tǒng)、密封系統(tǒng)；其中加載系統(tǒng)采用手動(dòng)水泵進(jìn)行人工加壓；穩(wěn)壓系統(tǒng)采用穩(wěn)壓罐來保證試驗(yàn)過程中壓力的穩(wěn)定；監(jiān)測系統(tǒng)采用千分表和電阻應(yīng)變儀兩種方式對試件的變形進(jìn)行觀測,采用密閉式量筒對滲流量進(jìn)行測量；密封系統(tǒng)采用直徑80mm的熱縮管和密封圈對試件進(jìn)行密封；2、試驗(yàn)采用分級加載法,在峰前的試驗(yàn)當(dāng)中,首先測量煤體的初始滲流量和逐級加載壓力時(shí)的瞬時(shí)變形,之后測量煤在當(dāng)前應(yīng)力級別下12小時(shí)內(nèi)的蠕變量和滲流量,最后擬合出試件的變形量、滲流量與時(shí)間的關(guān)系曲線圖,分析出試件峰前的裂紋擴(kuò)展情況及蠕變-滲流特性規(guī)律,得出在軸壓和圍壓固定時(shí),隨著孔隙水壓的增大,滲流量也不斷的增大,并且隨著孔隙水壓的增大,試件的蠕變量也增大的規(guī)律；并對試驗(yàn)結(jié)果采用高斯擬合公式得出峰前蠕變-滲流耦合方程：3、在峰后的試驗(yàn)當(dāng)中,將試件逐級加載至破壞,為了更好的觀察峰后的圍壓、軸壓的變化,在破壞之后將軸壓加載至20MPa,進(jìn)行24小時(shí)的試驗(yàn),記錄試驗(yàn)過程當(dāng)中滲流量、軸向變形、軸壓、圍壓的變化并擬合曲線,分析出試件峰后的裂紋擴(kuò)展情況、應(yīng)力松弛規(guī)律以及蠕變-滲流特性規(guī)律,得出試件破壞后隨著軸壓逐漸松弛,軸向蠕變速率逐漸減緩,滲流量逐漸降低,圍壓增大并逐漸趨于平緩的規(guī)律;并對試驗(yàn)結(jié)果采用高斯擬合公式得出峰后蠕變-滲流耦合方程。
[Abstract]:Rheological property is an important mechanical property of soft rock, especially in the process of coal mining, the surface disaster appears to have hysteresis and time effect, which is shown as creep property, while mining causes cracks in overburden rock of coal seam. When the surface water accumulates on rainy days, Rain Water will infiltrate into the coal seam, resulting in the change of the mechanical properties of the coal, resulting in the surface collapse, giant hole or landslide accident. Therefore, it is of great engineering significance to study the creep-seepage coupling law after the coal peak. In this paper, the creep-seepage law after the peak of coal is studied by means of experimental research and theoretical analysis. The creep-seepage test system is developed by ourselves, which includes loading system, steady pressure system and monitoring system. The sealing system, in which the loading system is manually pressurized by a manual pump, the pressure stabilizer is used to ensure the stability of the pressure during the test, and the deformation of the specimen is observed by the monitoring system in two ways, the meter and the resistance strain meter. The sealant flow is measured with a closed cylinder, and the sealing system uses a heat shrink tube with diameter 80mm and a sealing ring to seal the specimen. The test adopts the method of step loading, and in the test before the peak, First, the initial seepage flow of coal body and the instantaneous deformation of coal under step by step loading pressure are measured, then the creep amount and seepage flow rate of coal within 12 hours under the current stress level are measured. Finally, the curves of deformation, seepage flow and time of the specimen are fitted. The crack propagation and creep-seepage characteristics of the specimen before the peak are analyzed. It is concluded that when the axial pressure and confining pressure are fixed, the seepage volume increases with the increase of pore water pressure and increases with the increase of pore water pressure. The creep amount of the specimen also increases, and the creep seepage coupling equation: 3 is obtained by using the Gao Si fitting formula. In the post-peak test, the specimen is loaded to failure step by step, in order to better observe the confining pressure after the peak, The change of axial pressure, loading the axial pressure to 20MPa after failure, carries on the experiment for 24 hours, records the change of seepage flow, axial deformation, axial pressure, confining pressure and fitting curve, and analyzes the crack propagation after the peak of the specimen. The stress relaxation law and creep-seepage characteristic rule show that the axial creep rate decreases gradually and the confining pressure increases and tends to be gentle gradually with axial compression gradually loosening after failure. The Gao Si fitting formula is used to obtain the creep-seepage coupling equation after the peak.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD31

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