庫水波動帶岸坡原位聲波測試及劣化特性研究
本文選題:三峽庫區(qū) 切入點:消落帶 出處:《工程地質(zhì)學(xué)報》2017年02期 論文類型:期刊論文
【摘要】:為了揭示庫水波動帶內(nèi)巖體在庫水位周期性升降,干-濕循環(huán)條件下,其物理力學(xué)性質(zhì)變化特征,掌握不同巖性的劣化改造過程和差異性。選擇消落帶內(nèi)變形破壞強烈的侏羅系庫岸斜坡,在宏觀調(diào)查的基礎(chǔ)上,運用單孔、跨孔聲波測試方法進行原位試驗測試,同時進行原位樣品試件采集,運用干濕循環(huán)、力學(xué)測試、耐崩解等手段進行室內(nèi)試驗測試。原位單孔聲波測試KV值為0.2~0.51,跨聲波測試KV值為0.46~0.91,表明巖體橫向完整性差,縱向完整性相對較好,并且消落帶內(nèi)巖體隨著高程的降低,其巖體完整性呈下降趨勢;試件力學(xué)測試結(jié)果表明,20次干-濕循環(huán)后其強度平均下降30%~45%,且摩擦系數(shù)和黏聚力參數(shù)均呈逐漸降低趨勢;耐崩解性試驗表明,干-濕循環(huán)條件下,巖石耐崩解性逐漸降低,5次干-濕循環(huán)后,試件耐崩解性指數(shù)降低量達3.1%~20.2%。試驗結(jié)果均證實了消落帶內(nèi)巖體受庫水影響強烈,巖體長期在干-濕循條件下,其物理力學(xué)性質(zhì)呈降低趨勢,不同巖性劣化程度不同,巖體總體向破碎、解體的趨勢發(fā)展,并且具有漸進性和累積性。
[Abstract]:In order to reveal the reservoir water fluctuation zone in rock mass of reservoir water level fluctuation, dry wet cycle condition, the physical and mechanical properties changes, deterioration of the transformation process and the differences between the different lithologies. Master selection within the fluctuating zone of deformation and failure of the Jurassic reservoir slope strong, based on macroscopic investigation, use single hole, cross hole sonic testing method for in situ test, at the same time in the sample collection, the use of dry wet cycle, mechanical testing, indoor test and other means of resistance. In situ disintegration of single hole sonic testing KV value 0.2~0.51, KV value is 0.46~0.91 cross acoustic test, show that the rock mass integrity transverse, longitudinal complete relatively good, and the rock mass in the riparian zone along the elevation decreased, decreased the integrity of rock mass is the mechanical test results; test showed that the 20 dry wet cycle after the average intensity decreased by 30%~45%, and the coefficient of friction and The cohesion parameters were gradually decreased; resistance to slaking test showed that the dry wet cycle condition, rock disintegrative resistance decreased gradually, 5 times of dry wet cycles, the specimen disintegrative resistance index decreased amount of 3.1%~20.2%. test results verified that the fluctuating zone of rock mass in the strong influence of reservoir water, rock mass long in the dry wet cycle condition, the physical and mechanical properties decreased, the degree of degradation of different lithologic rock mass, the overall trend of development to fragmentation, disintegration, and with the progressive and cumulative.
【作者單位】: 中國地質(zhì)調(diào)查局武漢地質(zhì)調(diào)查中心;
【基金】:國家自然科學(xué)基金(41372321) 中國地質(zhì)調(diào)查局災(zāi)害預(yù)警項目(12120114079301) 水工環(huán)調(diào)查項目(121201009000150023)資助
【分類號】:P642.2
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