摘要
在几何非线性有限单元法的基础上,考虑大位移大应变情形,采用修正剑桥模型对软土花管压密注浆进行了数值模拟和分析。注浆的过程被模拟成不断在注浆体和土体的边界面上施加均匀压力的过程。分析结果表明,从竖向位移等值线分布情况来看,注浆孔上半部分出现向上的位移,下半部分则为向下的位移,也就是说,压密注浆过程中注浆段上方将出现上抬现象,这与注浆实际情况是一致的。从地表各点竖向位移的变化情况来看,位移最大值出现在地表孔壁处,随着径向距离增加,地表各点竖向位移逐渐减少为0。
Based on geometric nonlinear finite element method, large displacement and strain considered, Modified Cambridge model was adopted to simulate and analyze compaction grout in soft soil with bored pipe. Grouting pressure was added on the borderline of grout and soil in simulation of grouting process. The results show that displacement of the top section of grouting hole is upwards and the lower is downwards. The upward section is raised during compaction grouting , which is consistent with the fact. The maximum vertical displacement on the surface appears on the bore wall, and it is reduced gradually to 0 with the increase of radial distance.
出处
《铁道科学与工程学报》
CAS
CSCD
2009年第3期28-30,共3页
Journal of Railway Science and Engineering
基金
湖南省自然科学基金资助项目(07JJ3104)
广州市地下铁道总公司科技计划项目(09A003)
关键词
软土
花管压密注浆
有限元
大变形
大应变
soft soil
compaction grouting with bored pipe
finite elment
large displacement
large strain
