论文部分内容阅读
采用现场实测和室内试验相结合的方法,研究季节性气温变化、边坡深度、坡面植物种类和坡面朝向等因素对边坡土体含水率变化的影响规律。结果证明:边坡土体冻结过程中,水分向冻结区迁移;随着冻结深度增加,含水率的变化也会向深处发展;坡面木本植物比草本植物有更明显的吸水作用;边坡含水率和土体温度的变化影响土体的强度,边坡土体温度在0℃以上时,土体强度主要受含水率变化的影响,当土体温度在0℃以下时,强度主要受温度变化的影响;三轴试验证明:边坡土体的黏聚力首先随着含水率的增加而增大,含水率达到15%以后,边坡土体的黏聚力随含水率的增大而减小;边坡土体的内摩擦角基本上是随着含水率的增大而减小。研究成果可为季节性冻土地区高等级公路路堑边坡冻融失稳的预警提供判据。
The effects of seasonal temperature changes, slope depth, plant species on the slope surface and slope orientation on soil moisture content in slope soil were studied using a combination of field measurements and laboratory tests. The results showed that: during the freezing process of soil, the water migrated to the frozen zone. With the increase of the freezing depth, the change of the moisture content would also develop to the depth; the woody plants on the slope had more obvious water absorption than the herbs; Soil water content and soil temperature changes affect soil strength, soil temperature above 0 ℃, soil strength is mainly affected by changes in water content, soil temperature below 0 ℃, the main strength by The results of triaxial tests show that the cohesion of slope soil increases with the increase of water cut. When the water cut reaches 15%, the cohesion of slope soil increases with the increase of water cut But decreases; the internal friction angle of slope soil decreases with the increase of water content. The research results can provide the basis for early warning of freezing and thawing instability of high-grade highway cutting slope in seasonal frozen soil region.