A Study of Large Manmade-Slope Protection Method for Erosion in Large Farm Development.

这是一项关于农田开发中土木工程技术的实地研究。特别是，本研究的主要目的是大型人工边坡的稳定性及其侵蚀。本研究是在ABUKUMA山区的福岛县KOURIYAMA市郊区的试验场进行的。山脚下有许多泉水。一般在削山填谷造田时，都会在谷底兴建盲渠，以排除山坡上的雨水。但它的盲涵没有用。通过对“MASA土”的现场试验和现场调查，得出以下结论：（1）坡脚碎石垫层是一种很好的边坡防护材料，其作用机理是：（1）在坡脚碎石垫层的作用下，坡脚碎石垫层的抗渗能力较强;（2）在坡脚碎石垫层的抗渗能力较强; (2)在马萨山脚下应修建盲涵，用于收集排放的雨水。(3)未受干扰的马萨土壤的渗透性为10^<-3>-10 ^<-4>cm/sec，受干扰的马萨土壤的渗透性为10^<-4>-10 ^<-5>cm/sec。

This is a field study dealing with a civil engineering technique used a farm land development.Especially, main purposes in this study were a stability of large man-made slope and its erosion.This study was done in the test field at the suburbs of KOURIYAMA CITY in FUKUSHIMA prefecture, in the ABUKUMA mountains.There are many springs around the foot of the hills. Usually, when a farm land was made by cutting down the hills and by banking into the valley, blind culvert was constructed on the bottom of the valley for drainage the rain water from the hillbody. But its blind culvert was not useful. It is the reason that man-made slope was easy to break welling out rain water at the point of slope toe where the cutting and banking slope surface was crossed.The following characteristics of 「MASA SOIL」 was measured.The following conclusion was led from the results of the field test and the field investigations,(1) Gravel mat on the slope toe was very useful.(2) Blind culvert should be constructed on the foot Masa hill for catching the discharge rain water.(3) Undisturbed Masa soil's permeability has 10^<-3>-10^<-4>cm/sec,disturbed Masa soil's permeabiliy has 10^<-4>-10^<-5>cm/sec.