發(fā)布時(shí)間：2018-02-25 16:21

  本文關(guān)鍵詞： 安全工程 裂隙巖體 滲透率 粗糙度 應(yīng)力歷史 流固耦合　出處：《安全與環(huán)境學(xué)報(bào)》2017年01期 　論文類型：期刊論文

【摘要】：針對(duì)光滑平行板裂隙加載滲流規(guī)律難以準(zhǔn)確反映實(shí)際工程裂隙巖體卸荷滲流特性的問題,利用水力壓裂方法制作了天然巖芯裂隙,開展了裂隙試件受軸壓、圍壓加載和卸載作用的滲流試驗(yàn),并將裂隙試件的CT掃描圖像導(dǎo)入ABAQUS軟件,對(duì)粗糙裂隙受載時(shí)的應(yīng)力和變形規(guī)律進(jìn)行了數(shù)值模擬。結(jié)果表明:裂隙面的法向應(yīng)力是影響裂隙滲流的主要因素;在加載階段,粗糙裂隙面受載產(chǎn)生接觸應(yīng)力致使接觸部分產(chǎn)生變形和破壞,裂隙接觸剛度增大,裂隙寬度非線性減小,滲透率降低速率越來越小;在卸載階段,彈性變形逐步恢復(fù),裂隙寬度緩慢增加,滲透率先緩慢增大,當(dāng)載荷卸到一定值后,在孔隙壓力作用下裂隙張開、滲透率突然增大。研究結(jié)果表明了粗糙裂隙與光滑平行板裂隙對(duì)載荷敏感性不同的機(jī)理,反映了實(shí)際工程裂隙巖體卸荷滲流特性。
[Abstract]:In view of the problem that the seepage law of smooth parallel plate crack loading is difficult to accurately reflect the unloading seepage characteristics of practical engineering fractured rock mass, the natural core fractures are made by hydraulic fracturing method, and the fracture specimen is subjected to axial compression. The seepage test of confining pressure loading and unloading action, and the CT scanning image of fracture specimen were imported into ABAQUS software. Numerical simulation of stress and deformation law of rough fracture under loading is carried out. The results show that normal stress of fracture surface is the main factor affecting fracture seepage, and in the loading stage, The contact stress caused by the load on the rough fracture surface causes the deformation and failure of the contact part, the contact stiffness of the crack increases, the width of the crack decreases nonlinear, the rate of permeability decreases, and the elastic deformation recovers gradually in the unloading stage. The crack width increases slowly, the permeability increases slowly, and when the load is discharged to a certain value, the crack opens under the action of pore pressure. The results show that the mechanism of the difference between the rough fracture and the smooth parallel plate fissure is different to the load sensitivity, which reflects the unloading seepage characteristics of the actual engineering fissured rock mass.
【作者單位】： 遼寧工程技術(shù)大學(xué)力學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(11072103) 遼寧省高等院校優(yōu)秀人才支持計(jì)劃項(xiàng)目(LR2011008) 遼寧工程技術(shù)大學(xué)研究生創(chuàng)新項(xiàng)目(5A2014014-01)
【分類號(hào)】：TU45

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