【摘要】 土质墙体日光温室是一种在我国北方广泛应用的温室类型,目前的主要研究集中于对土质墙体保温、蓄热等功能特性的分析,而关于土质墙体结构稳定性的研究鲜见报道。本研究以辽宁省日光温室蔬菜主产区典型的9种土质为研究对象,借鉴边坡变形失稳机理的分析方法,从土体含水量出发,通过获取土样的基本物理力学指标,分析不同土样含水量与粘聚力、内摩擦角的关系,基于土样抗剪强度的试验结果,运用ANSYS软件对9种土质日光温室墙体的屈服破坏行为进行数值模拟,初步探索含水量与土质墙体稳定性的关系。结果表明:基于土样的基本物理力学性质,将试验所用土分类为黏土、粉质黏土及沙土。随着含水量的增加,黏土、粉质黏土和沙土的含水量与粘聚力均呈二阶指数衰减趋势,与内摩擦角呈线性负相关关系;黏土、粉质黏土和沙土含水量分别超过26%、16%和14%时极易引起日光温室土质墙体失稳;在此含水量范围内,外坡角增加到70°时,土质墙体的塑性区域逐渐由坡体内部发展到外坡角区域,且靠近地面附近的墙体是应力集中的主要区域,最易发生屈服破坏。用黏土、粉质黏土、沙土建造日光温室土质墙体时,建议含水量分别不宜超过26%、16%和14%,外坡角的合理范围为60°~70°,在进行土质墙体设计和支护时应充分考虑应力的主要集中区域。本研究对提高土质墙体结构日光温室设计及建造质量具有一定的指导意义。更多还原

【Abstract】 Earth-wall solar greenhouse is widely used in Northern China. The current researches mainly focuse on the analyses of function characteristics of the earth-wall, such as heat preservation and heat storage, while the researches on the stability of earth-wall structure are rare. In this study, nine kinds of representative soils which were collected in the main producing areas of solar greenhouse vegetable in Liaoning province, were tested for the basic physical and mechanical indexes to analyze the relationship between soil samples with water content and cohesive force, internal friction angle, and to simulate soil yield failure behavior of the nine soil wall solar greenhouses with ANSYS software based on the test results of shear strength of the soil samples. The soils were classified as clay, silty clay and sandy soil based on the basic physical-mechanical properties of the soil samples. Cohesive force of clay, silty clay and sandy soil presented the second order exponential decay trend with the increase of water content, and the internal friction angle presented a linear negative correlation. It was much easy to cause instability of solar greenhouse earth-wall when the water content of clay, silty clay and sand soil was more than 26%,16% and 14%,respectively. At this water content, the soil wall plastic area turned gradually from the internal development to the outside of slope angle when the outside slope angle increased to 70°. The low part of the greenhouse soil wall was the main area of stress concentration, most prone to yield failure. When solar greenhouse was built with clay, silty clay and sandy soil, it was suggested that water content should not be more than 26%, 16% and 26%, respectively. With reasonable range of slope angle of 60°~70°,and that more attention should be paid to the near ground area in the earth wall design and support. This research has a significance in improving structure design and construction quality of earth-wall solar greenhouse.更多还原