摘要
黏土路基在交通荷载作用下的沉降以及不均匀沉降问题越来越突出,孔压的累积与消散是其中重要的影响因素,探究出孔压发展规律对于科学设计与施工具有重要意义。在前人研究基础之上,采用GDS动态三轴仪器对天津地区饱和黏土进行试验,主要探究振动次数、动应力比和结构性对孔压发展的影响。试验结果表明,原状土孔压的增长速率随着振动次数的增加而逐渐减小,随着动应力比的增加而增大;重塑土孔压在振动初期迅速上升随后达到稳定,达到的稳定值比原状土高,稳定后有轻微的剪胀现象。针对试验结果,提出了适用于天津地区黏土动载模式下的孔压发展模型,并结合实际工程对黏土长期沉降进行预测。
The settlement and the uneven settlement of clay ground under traffic loads are more and more prominent. Theaccumulation and dissipation of pore water pressure is one of the most important factors, it is very important for scientific designand construction to probe into the development law of pore pressure. Based on the previous researches, we adopted the GDSdynamic triaxial apparatus to carry out tests of saturated clay in Tianjin area, mainly exploring the influence of the number ofvibration, dynamic stress ratio and structural property on the development of pore pressure. The results of undisturbed soil showthat the growth rate of pore pressure decreases with the increase of the number of vibrations and increases with the increase ofdynamic stress ratio. The results of remolded soil show that the pore pressure rises rapidly in the initial stage of vibration, thenreaches the stable value which is higher than undisturbed soil, and there is a slight dilatancy condition after stabilization.According to the test results, we proposed the pore pressure developing model of Tianjin clay under dynamic load, andpredicted the long-term settlement of clay combined with practical engineering.
出处
《中国港湾建设》
2018年第2期24-29,共6页
China Harbour Engineering
基金
国家自然科学基金面上项目(51578371
51378344)
关键词
饱和黏土
孔压模型
长期沉降
saturated clay
pore pressure model
long-term settlement
