發(fā)布時(shí)間：2019-04-24 11:00

【摘要】：全應(yīng)力-應(yīng)變下巖體的力學(xué)特性和應(yīng)力場下巖體的滲透規(guī)律研究是巖石力學(xué)學(xué)科領(lǐng)域研究的前沿方向。巖石內(nèi)部大都存在多種非連續(xù)面,其中包含孔隙,節(jié)理,微裂紋等各種缺陷,這些缺陷為裂隙流體的儲(chǔ)存和流動(dòng)提供了空間場所。我國南方煤田大多是以充水溶洞為主的茅口灰?guī)r巖溶礦床,研究含裂隙茅口灰?guī)r的強(qiáng)度特性、滲流力學(xué)特性和滲流場下的破壞特性為研究南方煤礦突水防治、隧道開挖等提供一定的理論依據(jù)。本文通過取從小到大具有代表性的滲透壓與圍壓并分配組合,對含裂隙灰?guī)r進(jìn)行了水-力耦合試驗(yàn),由試驗(yàn)結(jié)果對裂隙灰?guī)r在全應(yīng)力-應(yīng)變過程中的力學(xué)特征變化以及滲透性特征進(jìn)行了分析研究并且探討了水-力耦合作用下裂隙灰?guī)r的強(qiáng)度變化和以及變形特征。為了便于研究,文中還取了全應(yīng)力-應(yīng)變過程中六個(gè)相對重要的點(diǎn)的滲透率值做了定義。本文研究的主要結(jié)果如下:1、滲透壓對裂隙灰?guī)r的力學(xué)特征有一定的影響,裂隙灰?guī)r的強(qiáng)度以及變形模量會(huì)因?yàn)闈B透壓的存在而有一定程度的下降,滲透壓的存在對巖體的側(cè)向變形會(huì)有加強(qiáng)作用,水-力耦合作用下裂隙灰?guī)r的強(qiáng)度特征變化過程相對的影響因素更多,可以運(yùn)用莫爾-庫侖屈服準(zhǔn)則來表示;2、裂隙灰?guī)r的滲透率在試驗(yàn)過程中的變化會(huì)經(jīng)過滲透率緩慢下降、滲透率緩慢增加、滲透率快速增長和滲透率小幅度下降一共四個(gè)階段。對比全應(yīng)力-應(yīng)變曲線,這四個(gè)階段較好的對應(yīng)于其中的巖石體積壓縮階段、近線性變形階段、峰值點(diǎn)左右破裂階段和峰后殘余強(qiáng)度階段。這種對應(yīng)關(guān)系的一致性更好的表現(xiàn)在滲透率較低的情況下,在滲透率較高時(shí),會(huì)存在一定的不一致性,其中滲透率下降過程要少于體積壓縮的過程;3、對于體積壓縮階段的滲透率與其體積應(yīng)變之間的關(guān)系,由于其吻合性不同,在較低滲透壓的情況下,可以用負(fù)指數(shù)函數(shù)來進(jìn)行擬合,而在較高滲透壓的作用下,可以用三次多項(xiàng)式來進(jìn)行擬合。
[Abstract]:The research on the mechanical properties of rock mass under total stress-strain and the seepage law of rock mass under stress field is the frontier direction in the field of rock mechanics. There are many kinds of discontinuous surfaces in rock interior, which contain many kinds of defects such as pores, joints, micro-cracks and so on. These defects provide a space for the storage and flow of fractured fluids. Most of the coal fields in southern China are maokou limestone karst deposits dominated by water-filled karst caves. The strength characteristics of fissure-bearing Maokou limestone, the characteristics of seepage mechanics and the failure characteristics under seepage field are studied for the prevention and treatment of water inrush in southern coal mines. Tunnel excavation provides a certain theoretical basis. In this paper, the hydraulic-mechanical coupling test of fractured limestone is carried out by taking the typical combination of osmotic pressure and confining pressure from small to large. The mechanical and permeability characteristics of fracture limestone in total stress-strain process are analyzed and studied based on the experimental results. The strength change and deformation characteristics of fracture limestone under water-force coupling are also discussed. In order to facilitate the study, the permeability values of six relatively important points in the total stress-strain process are also defined. The main results obtained in this paper are as follows: 1. Osmotic pressure has a certain effect on the mechanical characteristics of fractured limestone, and the strength and deformation modulus of fractured limestone will decrease to a certain extent due to the existence of osmotic pressure. The existence of osmotic pressure will strengthen the lateral deformation of rock mass. There are more influencing factors in the process of strength change of fractured limestone under water-force coupling, which can be expressed by Mohr-Coulomb yield criterion (Mohr-Coulomb yield criterion). 2. During the test, the permeability of fractured limestone will decrease slowly, the permeability will increase rapidly, and the permeability will decrease by a small extent, there are four stages: the permeability decreases slowly, the permeability increases slowly, and the permeability increases slowly. Compared with the total stress-strain curves, these four stages correspond well to the rock volume compression stage, the near linear deformation stage, the rupture stage around the peak point and the residual strength stage after the peak. The consistency of the corresponding relation is better in the case of low permeability, when the permeability is high, there will be some inconsistency, in which the process of permeability decrease is less than the process of volume compression. 3, for the relationship between permeability and volume strain in the stage of volume compression, because of its different coincidence, the negative exponential function can be used to fit under the condition of lower osmotic pressure, but under the action of higher osmotic pressure, the relationship between the permeability and the volume strain can be fitted by negative exponential function under the condition of lower osmotic pressure. Cubic polynomial can be used to fit.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD313

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