本文選題：紅層軟巖 + 崩解特性��； 參考：《巖土力學(xué)》2017年11期

【摘要】：紅層軟巖遇水崩解是引發(fā)工程災(zāi)害的重要原因。紅層軟巖遇水崩解緣于水作用下軟巖細觀成分組構(gòu)的變化,但目前軟巖崩解特性定量表征研究多根據(jù)宏觀現(xiàn)象,所得到的崩解模型難以對軟巖崩解的細觀過程進行研究。根據(jù)室內(nèi)軟巖靜態(tài)崩解和軟巖碎片浸水試驗以及不同浸泡階段的軟巖的成分組構(gòu)掃描電鏡觀察試驗,揭示了水-軟巖界面的細觀演化規(guī)律:紅層軟巖的崩解機制緣于軟巖碎片間泥質(zhì)填充區(qū)中水-巖界面上的黏土顆粒在水作用下發(fā)生水化、擴散和流失致使泥質(zhì)膠結(jié)帶縮減,從而引起碎片間凝聚力下降;靜水作用下軟巖碎片間的凝聚力隨時間呈冪函數(shù)衰減。在此基礎(chǔ)上,利用界面與膠體化學(xué)、斷裂力學(xué)理論,定量表征了軟巖中水化黏土顆粒的流失以及軟巖碎片間的模式Ⅱ型開裂,建立了軟巖遇水崩解的界面模型,進而定量表征了軟巖遇水崩解過程。通過對比計算,利用上述所建模型計算的軟巖碎片剝落時間和試驗觀察的軟巖碎片剝落時間相近,從而驗證了模型的合理性。
[Abstract]:The collapse of red bed soft rock is an important cause of engineering disaster. The breakup of soft rock in red bed is caused by the change of meso-compositional fabric of soft rock under the action of water. However, the quantitative characterization of the disintegration characteristics of soft rock is mostly based on macroscopic phenomena, and it is difficult to study the meso-process of soft rock disintegration by the obtained disintegration model. According to the static disintegration of soft rock in laboratory and the soaking test of soft rock fragments, the composition of soft rock in different soaking stages was observed by scanning electron microscope (SEM). The microcosmic evolution of the water-soft rock interface is revealed. The collapse mechanism of the soft rock in the red bed is due to the hydration of clay particles at the water-rock interface in the muddy fill area between the soft rock fragments, the diffusion and loss of the clay cementation zone, and the reduction of the muddy cementation zone. The cohesion of soft rock fragments decreases with time, and the cohesion of soft rock fragments decreases with time. On this basis, the loss of hydrated clay particles in soft rock and mode 鈪，

本文編號：2004286