侧向应变下膨胀土侧向压力变化规律试验研究
Experimental Study on the Change Law of Lateral Pressure of Expansion Soil Under Lateral Strain
冯炜栋 1张文慧 1王少鹏 2王东英 3王斯杰1
作者信息
- 1. 河海大学 岩土力学与堤坝工程教育部重点实验室,江苏 南京 210024
- 2. 中国农业发展银行西藏自治区分行,西藏 拉萨 850000
- 3. 宿迁市港航事业发展中心,江苏 宿迁 223899
- 折叠
摘要
膨胀土边坡土体含水率增加时会发生一定的侧向膨胀变形,同时产生一定的侧向压力,其由周围土体约束变形产生的侧向膨胀力与土体自重与上覆荷载导致的侧向土压力组成,该侧向压力特别是侧向膨胀力的产生是膨胀土边坡浅层破坏的主要原因之一.通过自制仪器进行了控制侧向应变的侧向压力试验,研究侧向压力在侧向应变、上覆压力与干湿循环等因素影响下的变化规律.试验结果表明:侧向压力随上覆压力呈线性递增关系,其趋势不随其他条件影响而改变;干湿循环的进行会导致侧向压力有一定程度的降低,但在一定循环次数后会逐渐趋于稳定;侧向压力随侧向应变的增加大幅度减少,但减少幅度逐渐降低;在现有的变化范围内,侧向应变对侧向压力的改变最为明显,上覆压力次之,干湿循环次数的影响相对较小.
Abstract
As the moisture content of the expansive soil slope increases,a certain amount of lateral ex-pansion deformation occurs,and a certain amount of lateral pressure is generated which is composed of the lateral expansion force generated by the constraint deformation of the surrounding soil and the lateral soil pressure caused by the self-weight of the soil and the overlying load.The lateral pressure,especia-lly the generation of lateral expansion force,is one of the main reasons for the shallow failure of the ex-pansive soil slope.A lateral pressure test was conducted using a self-made instrument to control the late-ral strain,and the variation law of the lateral pressure under the influence of factors such as the lateral strain,overlying pressure,and wet-dry cycles was studied.The experimental results show that the late-ral pressure increases linearly with the overlying pressure,and the increase trend does not change with the influence of other conditions.The progress of wet-dry cycles will lead to a certain degree of reduc-tion in the lateral pressure,but it will gradually stabilize after a certain number of cycles.The lateral pressure decreases significantly with the increase of lateral strain,but the decrease extent gradually de-creases.Within the existing range of changes,the lateral strain has the most significant effect on lateral pressure,followed by the overlying pressure,and the impact of wet-dry cycles is relatively small.
关键词
膨胀土/侧向压力/干湿循环/上覆压力/侧向应变Key words
expansive soil/lateral expansive force/dry-wet cycle/overlying pressure/lateral strain引用本文复制引用
基金项目
江苏省自然科学基金资助项目(BK2017434)
出版年
2024
NETL
NSTL
万方数据