【摘要】：以三峽庫(kù)區(qū)岸邊坡消落帶的典型砂巖為研究對(duì)象,針對(duì)其實(shí)際的賦存環(huán)境設(shè)計(jì)了干濕循環(huán)和凍融循環(huán)2種試驗(yàn)方案,分別研究了2種試驗(yàn)方案過(guò)程中砂巖試樣的力學(xué)特征,分析了浸泡在不同化學(xué)溶液中的砂巖試樣經(jīng)歷不同循環(huán)次數(shù)后各力學(xué)參數(shù)的變化規(guī)律.試驗(yàn)結(jié)果表明:干濕循環(huán)和凍融循環(huán)作用下砂巖試樣具有明顯的"弱化"趨勢(shì),其斷裂韌度、抗壓強(qiáng)度和抗拉強(qiáng)度劣化趨勢(shì)基本一致,但試樣各力學(xué)參數(shù)的劣化程度卻存在差異.其中,斷裂韌度KIC的劣化程度最大,抗拉強(qiáng)度次之,抗壓強(qiáng)度最小.干濕循環(huán)和凍融循環(huán)作用過(guò)程中砂巖試樣各力學(xué)參數(shù)的劣化程度均非常顯著,該現(xiàn)象說(shuō)明在模擬庫(kù)岸邊坡消落帶巖體遭受化學(xué)溶液作用時(shí),干濕循環(huán)和凍融循環(huán)作用均是不可能忽視的影響因素.但比較而言,在凍融循環(huán)作用下砂巖試樣各力學(xué)參數(shù)的劣化程度更加顯著.不同的化學(xué)溶液對(duì)砂巖試樣力學(xué)特征的損傷劣化程度的影響有所不同,酸性化學(xué)溶液加劇了砂巖的劣化程度,而SO2-4離子對(duì)砂巖劣化的影響大于HCO-3離子的.
[Abstract]:Taking the typical sandstone along the slope of the three Gorges reservoir area as the research object, the dry wet cycle and freeze-thaw cycle test schemes are designed for their actual storage environment, and the mechanical characteristics of the sandstone samples in the process of the two test schemes are studied respectively. The variation of mechanical parameters of sandstone samples immersed in different chemical solutions was analyzed after different cycles. The results show that under the action of dry and wet cycles and freezing and thawing cycles, the sandstone samples have an obvious "weakening" trend, and the deterioration trend of fracture toughness, compressive strength and tensile strength is basically the same. However, the deterioration degree of the mechanical parameters of the specimen is different. The degradation of fracture toughness KIC is the biggest, the tensile strength is the second, and the compressive strength is the least. The deterioration of the mechanical parameters of sandstone samples during dry and wet cycles and freeze-thaw cycles is very significant. This phenomenon shows that when the rock mass of slope collapse zone on the bank of reservoir is subjected to chemical solution action, Both wet and dry cycles and freeze-thaw cycles are the influential factors which can not be ignored. However, the degradation of mechanical parameters of sandstone samples is more significant under the action of freeze-thaw cycle. The effects of different chemical solutions on the damage and deterioration of sandstone samples are different. Acid chemical solution intensifies the degradation of sandstone, while SO2-4 ion has more influence on the degradation of sandstone than HCO-3 ion.
【作者單位】： 西安理工大學(xué)巖土工程研究所;西安理工大學(xué)土木建筑工程學(xué)院;
【分類(lèi)號(hào)】：O346.1
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本文編號(hào)：2140967