交通荷载作用后粉质黏土不排水强度特性试验研究

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摘要利用动三轴仪，对京津高速铁路沿线典型的饱和粉质黏土经历交通荷载长期作用前后的强度进行对比试验，研究排水条件、施工扰动及超固结等因素对土体振后不排水强度的影响。研究结果表明：长期交通荷载作用下产生的累积轴向应变和孔压均可作为试样结构破坏程度的表征，且存在临界值。当应变或孔压超过其临界值时，振后强度会发生衰减。若施工扰动破坏了土体天然结构性，两者的临界值均将大大降低，地基振后强度均发生衰减，且衰减程度也比天然地基大。地基中存在良好的排水途径将有效提高正常固结地基振后承载能力；交通荷载的往复作用及排水条件对预压处理后的超固结地基强度影响较小。

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关键词 ：土力学, 不排水剪切强度, 交通荷载, 粉质黏土, 似超固结比

Abstract：To investigate the effect of drainage condition，disturbance of construction and overconsolidation effects on the static undrained strength of the soil，a series of postcyclic undrained triaxial strength tests are carried out on samples of a silty clay(obtained along Beijing—Tianjin speed line). The results show that the generated excess pore pressure and residual shear strain of the specimens after long-term traffic load both can be regarded as the characterizations of damage degree of soil structure，and they all have their threshold values. If the pore pressure or shear strain after cyclic load exceeds its threshold value，the strength attenuation of the specimens will be caused. Apparent reductions in the threshold values are observed as the post cyclic strength by comparison of the reconstituted and intact specimens. Moreover，the soil strength of reconstituted one is lower than that of intact one at the same effective confining stress，which means that the construction disturbance should be paid more attention. Good drainage condition will enhance the bearing capacity of normally consolidated foundation. The traffic load and drainage conditions have little effects on the post cyclic shear strength of the foundation with the application of preload treatment.

Key words： soil mechanics undrained shear strength traffic load silty clay apparent overconslidation ratio(AOCR)

引用本文:

黄博1，2，丁浩1，2，陈云敏1，2，边学成1，2. 交通荷载作用后粉质黏土不排水强度特性试验研究[J]. 岩石力学与工程学报, 2010, 29(S2): 3986-3993.
HUANG Bo1，2，DING Hao1，2，CHEN Yunmin1，2，BIAN Xuecheng1，2. EXPERIMENTAL STUDY OF UNDRAINED STRENGTH PROPERTY OF SATURATED SILTY CLAY AFTER TRAFFIC LOAD. , 2010, 29(S2): 3986-3993.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2010/V29/IS2/3986

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