【摘要】：由于天然巖體裂隙分布的隱蔽性和不確定性,很難準(zhǔn)確評(píng)價(jià)天然裂隙巖體的滲透性和可灌性。離散裂隙網(wǎng)絡(luò)作為描述天然裂隙網(wǎng)絡(luò)的有力工具,能在一定程度上反應(yīng)裂隙巖體的某些特征,但都是基于統(tǒng)計(jì)意義上的概率分布,無(wú)法反應(yīng)裂隙網(wǎng)絡(luò)參數(shù)的內(nèi)部聯(lián)系以及微觀特征。Mandelbrot提出的分形幾何是描述不規(guī)則物體的重要工具,研究發(fā)現(xiàn)裂隙網(wǎng)絡(luò)中的裂隙跡長(zhǎng)分布服從分形特征,很多學(xué)者利用這一理論對(duì)裂隙網(wǎng)絡(luò)的滲透性進(jìn)行了研究,推導(dǎo)了裂隙網(wǎng)絡(luò)滲透系數(shù)的表達(dá)式。然而缺乏裂隙網(wǎng)絡(luò)的可灌性和灌漿量的研究。本文首先利用裂隙網(wǎng)絡(luò)的分形特征和裂隙跡長(zhǎng)與隙寬的關(guān)系,建立了裂隙巖體導(dǎo)水率的分形模型,推導(dǎo)了裂隙巖體導(dǎo)水率與分形維數(shù)的關(guān)系表達(dá)式,并與已有研究結(jié)果進(jìn)行了對(duì)比,證實(shí)了該關(guān)系式的可靠性。其次,分析了裂隙巖體灌漿注灰量與分形維數(shù)的關(guān)系,進(jìn)而推導(dǎo)了注灰量與導(dǎo)水率的關(guān)系式,根據(jù)注灰量與導(dǎo)水率的關(guān)系曲線對(duì)灌漿區(qū)域的劃分,定義了3個(gè)不同的灌漿區(qū)域:正常區(qū)域、微小裂隙區(qū)域和擴(kuò)展區(qū)域,分別對(duì)應(yīng)于正常灌漿、微小裂隙較多和裂隙擴(kuò)展變形這3種不同的灌漿狀態(tài)。最后,通過(guò)與工程實(shí)測(cè)數(shù)據(jù)的對(duì)比,證實(shí)了本文注灰量與導(dǎo)水率關(guān)系式的可靠性和適用性,也說(shuō)明了3個(gè)灌漿區(qū)域的劃分是合理并且重要的。因此,該關(guān)系式和灌漿區(qū)域的劃分可以用來(lái)預(yù)測(cè)和評(píng)價(jià)實(shí)際工程灌漿施工的合理性和可灌性。
[Abstract]:Due to the invisibility and uncertainty of the distribution of fractures in natural rock mass, it is difficult to accurately evaluate the permeability and irrigability of natural fractured rock mass. As a powerful tool to describe natural fracture network, discrete fracture network can reflect some characteristics of fractured rock mass to some extent, but it is based on statistical probability distribution. The fractal geometry proposed by Mandelbrot is an important tool to describe irregular objects. Many scholars use this theory to study the permeability of fracture network and derive the expression of permeability coefficient of fracture network. However, there is a lack of research on the irrigation capacity and grouting quantity of the fissure network. In this paper, the fractal model of the hydraulic conductivity of fractured rock mass is established by using the fractal characteristics of fracture network and the relationship between crack trace length and gap width, and the expression of the relation between hydraulic conductivity and fractal dimension of fractured rock mass is derived. The reliability of the relationship is confirmed by comparing with the existing research results. Secondly, the relationship between grouting ash quantity and fractal dimension of fractured rock mass is analyzed, and the relationship between ash injection quantity and water conductivity is deduced, and the grouting area is divided according to the relationship curve between ash injection quantity and water conductivity. Three different grouting regions are defined: normal area, small fissure area and extension area, which correspond to three different grouting states respectively: normal grouting, large number of small cracks and crack spreading deformation. Finally, the reliability and applicability of the relationship between the ash injection rate and the water conductivity are confirmed by comparing with the measured data, and the division of the three grouting areas is reasonable and important. Therefore, the relationship and the division of grouting area can be used to predict and evaluate the rationality and irrigability of actual grouting construction.
【作者單位】： 天津大學(xué)水利工程仿真與安全國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(51439005);國(guó)家自然科學(xué)基金(51339003) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)(2013CB035904)
【分類號(hào)】：TV223
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本文編號(hào)：2408092