【摘要】：依據(jù)疏浚工程珊瑚礁巖的物理力學(xué)試驗資料,應(yīng)用珊瑚礁沉積原理和結(jié)構(gòu)特征理論知識,將疏浚珊瑚礁巖分為3類:管狀珊瑚礁巖、蜂窩狀珊瑚礁巖和致密狀珊瑚礁巖。從珊瑚礁巖的特性角度出發(fā),分析了礁巖類別、顆粒成分和破壞應(yīng)變率對抗剪強(qiáng)度的影響及規(guī)律。結(jié)果表明:1)粘聚力c和內(nèi)摩擦角φ均具有無填充管狀珊瑚礁填充珊瑚砂粒蜂窩狀珊瑚礁填充鈣質(zhì)膠結(jié)方解石致密狀珊瑚礁的特點(diǎn)。2)內(nèi)摩擦角φ值與粒徑大于5 mm的含量值相關(guān)性最好,回歸系數(shù)為0.862。3)c和φ值隨軸向應(yīng)變的增加而迅速增加,抗剪強(qiáng)度達(dá)到峰值,所需應(yīng)變率為0.018%~0.082%,都為脆性破壞,呈現(xiàn)剪切、劈裂和沿裂隙破壞3種形式。
[Abstract]:Based on the physical and mechanical test data of coral reef rocks in dredging engineering, the dredged coral reef rocks are divided into three types: tubular coral reef rock, honeycomb coral reef rock and dense coral reef rock by using the principle of coral reef deposition and the theoretical knowledge of structural characteristics. From the point of view of the characteristics of coral reef rocks, the effects and laws of reef types, particle composition and failure strain rate on shear strength are analyzed. The results show that: 1) both cohesion c and internal friction angle 蠁 have the characteristics of unfilled tubular coral reefs filled with coral sand and honeycomb coral reefs filled with calcareous calcite dense coral reefs. 2) the internal friction angle 蠁 has the best correlation with the content of particle size larger than 5 mm. The regression coefficient is 0.862.3) c and 蠁 increase rapidly with the increase of axial strain, and the shear strength reaches the peak. The required strain rate is 0.018% 鈮，

本文編號：2497861