摘要
大洋27航次中,在马里亚纳海沟挑战者深渊南翼斜坡上获得了箱式插管和重力柱状样品,并对这些样品现场进行了含水率、湿密度、微型扭力十字板、微型贯入和无侧限抗压强度试验,获得了深海表层沉积物的物理力学性质参数,具有较高的含水率、较低的密度、较大的孔隙比、较低的抗剪强度和贯入阻力,各项参数随深度增加呈现规律性变化。归航后通过对沉积物的粒度、碎屑矿物、黏土矿物、微体古生物的鉴定,进一步从物质组成、物质来源和沉积环境等方面对此特殊工程地质性质沉积物的成因进行分析。
During the 27th voyage of oceanic expedition, box-type intubation samples and gravity column samples were obtained on the southern slope of the Challenger deep in Mariana Trench. We had spot tests of water content, wet density, micro-torsion cross plate, micro-penetration and unconfined compressive strength on these samples, and got the physical and mechanical properties of deep sea sediments, which have high water content, low density, large void ratio, low shear strength and penetration resistance, and show regu- lar variations with the depth. Through identification of sediment grain, detrital minerals, clay minerals and microfossils after the 27th voyage homing, the genesis of these sediments with special engineering geological properties was analyzed from the aspects of material composition, source and sedimentary environment.
出处
《地质学刊》
CAS
2015年第2期251-257,共7页
Journal of Geology
基金
国际海域资源调查与开发"十二五"课题"首采区多金属结核资源评价"(DY125-14-R-01)
关键词
深海沉积物
含水率
抗剪强度
工程地质性质
挑战者深渊
马里亚纳海沟
deep sea sediment
water content
shear strength
engineering geological property
Challenger deep
Mariana Trench
