循环荷载作用下重塑素土和根系加筋土动力试验研究  

Dynamic experimental study on remolded soil and plant-root reinforced soil under cyclic load

作　　者：严振石 YAN Zhen-shi(Guangxi Xijiang Development&Investment Group Co.,Ltd.,Nanning 530022,China)

机构地区：[1]广西西江开发投资集团有限公司,广西南宁530022

出　　处：《水运工程》2021年第11期186-191,共6页Port & Waterway Engineering

基　　金：国际科技合作重点项目计划项目(2019YFE0121000)。

摘　　要：船行波引发的循环荷载是造成内河航道岸坡失稳、破坏的重要原因之一,深入研究循环荷载作用下土体失稳和破坏机理对航道岸坡的设计具有重要意义。植物护岸技术是通过根系与土体紧密结合,从而改变土体强度。基于那吉库区重塑素土和重塑根系加筋土,利用三轴循环荷载试验,模拟船行波荷载长期作用,研究重塑素土和重塑根系加筋土在循环荷载作用下的循环荷载振次、强度、围压强度与土体应变之间的关系。结果表明,当围压稳定时,试样残余应变随着循环荷载的增大而增大。但相同围压条件下,重塑根系加筋土的内摩擦角和黏聚力高于重塑素土,说明植物根系的存在提高了土体对于船行波的抵抗效应,提高土体在循环荷载作用下的抗剪强度。The cyclic load caused by the ship traveling wave is one important reason which leads to the instability of inland waterway revetment,thus it has significance to study the mechanism of soil instability and failure under cyclic load for the design of inland waterway revetment.Plant revetment protection technology can enhance the soil strength by the root combining closely with soil.Based on the remolded plain soil and remolded root reinforced soil of Naji Reservoir,we apply the triaxial cyclic loading test,simulate the long-term action of ship traveling wave load,study the relationships of cyclic loading vibration time,strength,confining pressure strength and soil strain of remolded plain soil and remolded root reinforced soil under cyclic loading.The results show that the residual strain of remolded plain soil and remolded root reinforced soil increases with the increase of cyclic load under different confining pressure.Under the same cyclic load,the internal friction angle and cohesion of remolded root reinforced soil are higher than these of remolded plain soil,and the existence of root improves the resistance effect of soil to ship traveling wave,and improves the shear strength of soil under the cyclic load.

关 键 词：循环荷载 重塑素土 重塑根系加筋土 残余应变 抗剪能力 

分 类 号：U656.3[交通运输工程—港口、海岸及近海工程]