水田表层土壤力学特性的原位试验分析  

In-situ test analysis on mechanical properties of paddy surface soil

作　　者：李澜 黄博翰 曾剑辉 刘木华[1,2] 黎静 薛龙[1,2] LI Lan;HUANG Bohan;ZENG Jianhui;LIU Muhua;LI Jing;XUE Long(College of Engineering,Jiangxi Agricultural University,Nanchang 330045,China;Key Lab of Modem Agricultural Equipment,Nanchang 330045,China)

机构地区：[1]江西农业大学工学院,江西南昌330045 [2]江西省现代农业装备重点实验室,江西南昌330045

出　　处：《河北农业大学学报》2023年第1期121-126,共6页Journal of Hebei Agricultural University

基　　金：国家自然科学基金(51865018);江西省自然科学基金(20192BAB206025)。

摘　　要：了解松软状态下表层和次表层水田土壤的力学参数是研制高通过性水田轮和耕作部件的前提。本文以松软状态下的水田土壤为研究对象,利用简易贝氏仪,对不同含水率条件下水田土壤的承压和剪切参数进行原位测量。试验结果表明,含水率在31.08%~38.26%范围内时,水田土壤变形指数0.61≤n≤0.72。对于摩擦变形模量Kφ而言,随着含水率的不同而变化,变化范围70.12~92.80 kN/m^((n+2))。含水率在液限附近时,含水率31.08%与33.12%相比,其内聚变形模量Kc增加10.08 kN/m((n+1)),变化明显。当含水率在31.38%~47.42%范围时,内摩擦角φ与含水率的数据拟合关系为y=-2.043 9x+100.74,R2为0.892。内聚力c随着含水率的不同而变化,变化范围964.68~2 370.70 Pa。本文试验结果可为常规农机在水田中的通过性能评估和耕作部件的减阻优化提供土壤参数依据。Understanding the mechanical parameters of surface and subsurface paddy soils under soft conditions is a prerequisite for developing high-pass paddy wheels and tillage components. In this paper, the paddy soil in soft state was taken as the research object, and the pressure-sinkage characteristics and shear properties of paddy soil under different moisture content conditions were measured in situ by using a simple bevameter. The test results showed that the paddy soil deformation index was 0.61≤n≤0.72 when the moisture content was in the range of 31.08 %-38.26 %.The friction deformation modulus varied with the moisture content in the range of 70.12-92.80 kN/m^((n+2)). When the moisture content was near the liquid limit, the cohesive deformation modulus Kc increases by 10.08 kN/m(n+1), when the moisture content was 31.08 % compared with 33.12 %,. When the moisture content was in the range of 31.38%-47.42 %, the fitting relationship between internal friction anglea φ and moisture content was y =-2.0439x+100.74.R~2=0.892. The cohesive force c varied with the moisture content in the range of 964.68-2370.70 Pa. The test results in this paper can provide soil parameter basis for the performance evaluation of conventional agricultural machinery in paddy fields and the drag reduction optimization of tillage components.

关 键 词：水田土壤 承压特性 剪切特性 车辆通过性 

分 类 号：TB17[生物学—生物工程] TU41[建筑科学—岩土工程]