摘要
以上海市深层调蓄管道系统工程58 m基坑为背景,对埋深约110 m的第(10)层黏土进行了不同卸荷应力下的回弹再压缩试验,并分析了试验结果。结果表明:在1 000 kPa卸荷压力下,该黏土表现出显著的回弹变形特征:当卸荷比不大于0.4时,土体基本没有回弹变形;当卸荷比大于0.8时,土的回弹迅速增加,回弹模量显著弱化。并明确了黏性土的回弹模量和压缩模量,二者的对应关系。
Taking the 58-meter deep excavation of the Shanghai Deep Storage Pipeline System Project as the background,rebound and recompression tests were conducted on the 10th layer of clay at a depth of approximately 110 meters under dif-ferent unloading stresses,analyzes the test results.The test results indicate that under an unloading pressure of 1000 kPa,the rebound deformation characteristics of the 10th layer of clay are as follows:when the unloading ratio is less than or equal to 0.4,the soil exhibits almost no rebound deformation;however,when the unloading ratio exceeds 0.8,the rebound of the soil increases rapidly,and the rebound modulus significantly weakens,and clarifies the corresponding relationship between the rebound modulus and compressive modulus of cohesive soil.
作者
邢春艳
朱墩
杭荟旻
Xing Chunyan;Zhu Dun;Hang Huimin(Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China)
出处
《山西建筑》
2026年第2期64-67,74,共5页
Shanxi Architecture
关键词
超深基坑
回弹试验
回弹模量
压缩模量
ultra-deep foundation pit
rebound test
rebound modulus
compression modulus
