摘要
粉喷桩-土工格栅复合地基使地基水平向和竖直向对抵抗变形的能力得到了增强。针对粉喷桩联合土工格栅加固地基性状进行了现场研究,包括地基的沉降、地土压力、孔隙水压力。根据试验结果,分析了格栅上下土压力的变化、桩土应力比变化、沉降与土压力的关系以及埋于不同深度孔隙水压力变化情况,得到桩-网复合地基受力机理和地基沉降的规律:(1)超孔隙水压力消散慢,但孔隙水压力与上部填土相比变化不大;(2)桩土应力较大,具有均化土压力的作用,同时基于各个断面土压力分布特点,提出了“拱效应”的观点;(3)地基的变形主要是以下卧软土层压缩和桩刺入变形和桩本身的变形,研究结果为进一步的理论研究和工程设计提供了有益的依据。
Pile-net composite foundations can be used to minimize the vertical and horizontal displacements of embankments on soft clay foundations. The behaviors of clay foundations stabilized by dry jet mixing piles combined with geogrid are studied, including settlement, excess pore water pressures and soil pressures. According to testing results, changes of pressures on and below geogrids, stress ratio of pile to soil, dissipation of excess pore water pressure and the relation of settlement and soil pressure are analyzed..From that, it can be concluded that （1） the excess pore water dissipates slowly, but its value is not larger than the above loading; （2）geogrid can improve the average result of soil pressures and can make the stress ratio of pile to soil large, and at the same time ,based on distribution of soil pressure of each cross section ,the viewpoint of arching effect is put forward; and （3） settlement is generated mainly by compress of the underlying clay and piercing deformation and self-deformation of dry jet mixing pile; the testing data provide useful information for theoretical analysis and designing.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第2期376-380,共5页
Rock and Soil Mechanics
关键词
粉喷桩
土工格栅
粉喷桩-土工格栅复合地基
土压力
桩上应力比
拱效应
超孔隙水压力
dry jet mixing pile
geogrids
dry jet mixing pile-geogrid composite foundation
soil pressure
stress ratio of pile to soil
arching effect
excess pore water pressure
