本文關(guān)鍵詞：含水狀態(tài)對紅層軟巖力學(xué)特性影響機理　出處：《煤炭學(xué)報》2017年08期 　論文類型：期刊論文

  更多相關(guān)文章： 紅層軟巖 含水狀態(tài) 劣化 微觀孔隙 微觀結(jié)構(gòu)

【摘要】：飽水狀態(tài)下,紅層軟巖力學(xué)特性的劣化直接影響相關(guān)工程的變形穩(wěn)定�？紤]干燥、自然和飽水3種狀態(tài),對紅層軟巖抗壓和抗拉強度特性、變形破壞特征及微觀結(jié)構(gòu)特征進行了比較系統(tǒng)的試驗和檢測分析。研究表明:①飽水狀態(tài)下紅層軟巖的軟化特征明顯,破壞時的延性特征更加明顯,不同圍壓下巖樣的抗壓強度軟化系數(shù)為0.36~0.65,相對于干燥狀態(tài),彈性模量和變形模量逐漸降低分別降低了35.60%~75.53%,44.57%~69.64%,而且圍壓越小,抗壓強度和模量降低趨勢越明顯;②相對干燥狀態(tài),飽水狀態(tài)下巖樣的黏聚力、內(nèi)摩擦角分別下降了47.77%和12.68%,巖樣的黏聚力對含水狀態(tài)更為敏感;③飽水狀態(tài)下巖樣抗拉強度軟化系數(shù)為0.40,加載線附近局部破壞特征明顯;④巖樣內(nèi)部礦物顆粒間泥質(zhì)膠結(jié)物的溶解破壞,伊利石、蒙脫石等黏土礦物吸水膨脹、分解,使得巖體結(jié)構(gòu)由相對密實狀態(tài)逐漸變得多孔、松散,而且孔隙多被水充填,這些微觀結(jié)構(gòu)的改變直接導(dǎo)致了紅層軟巖力學(xué)性質(zhì)的劣化。
[Abstract]:The saturation condition, deterioration of mechanical properties of soft rock of red layer directly affect the deformation and stability of related engineering. Considering the natural dry and water saturated 3 kinds of state of red layer soft rock compressive strength and tensile strength characteristics, deformation characteristics and microstructure characteristics were compared with the test system and test analysis. The results show that the water saturated softening characteristics of soft rock of red layer obviously, ductility failure is more obvious, the compressive strength under different confining pressure rock softening coefficient is 0.36~0.65, relative to the dry state, elastic modulus and deformation modulus decreases respectively decreased 35.60%~75.53%, 44.57%~69.64%, pressure is small and round, and the compressive strength the modulus decreased more obviously; the relatively dry, water saturated rock cohesion, internal friction angle decreased by 47.77% and 12.68%, the cohesion of rock is more sensitive to water content; the water saturated state The softening of rock tensile strength coefficient is 0.40, the loading line in the vicinity of the local damage characteristics; the dissolved rock mineral particles argillanceous cement damage, illite, montmorillonite clay mineral swelling, decomposition, making the rock mass structure by relatively dense state gradually become porous, loose and porous water filling, these the change of microstructure directly leads to the deterioration of red layer soft rock mechanical properties.

【作者單位】： 三峽大學(xué)三峽庫區(qū)地質(zhì)災(zāi)害教育部重點實驗室;
【基金】：國家自然科學(xué)基金資助項目(51679127);國家自然科學(xué)基金重點資助項目(51439003) 水利部公益基金資助項目(201401029)
【分類號】：TU45
【正文快照】： 紅層軟巖作為一類特殊的巖體,遇水易產(chǎn)生膨脹變形,甚至崩解破壞,在各類巖土工程中普遍存在,往往對邊坡、壩基以及地下洞室的變形穩(wěn)定性起著控制性作用[1]。較多學(xué)者對紅層軟巖的物理力學(xué)特性進行了理論和試驗研究。孫喬寶[2],萬宗禮等[3]對紅層軟巖結(jié)構(gòu)構(gòu)造及巖體結(jié)構(gòu)特征進行

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