Research on Unloading Rebound Deformation of Muddy Silty Clay at Hexi District in Nanjing City

侯晓亮; 周建华; 赵晓豹; 李晓昭

doi:10.13409/j.cnki.jdpme.2011.04.006

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Research on Unloading Rebound Deformation of Muddy Silty Clay at Hexi District in Nanjing City

更新时间：2025-12-11

- Research on Unloading Rebound Deformation of Muddy Silty Clay at Hexi District in Nanjing City
- Vol. 31, Issue 4, Pages: 397-402(2011)
- 作者机构：
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- DOI：10.13409/j.cnki.jdpme.2011.04.006
  CLC： U43
- Published：2011
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[1]侯晓亮,周建华,赵晓豹,李晓昭.南京河西淤泥质粉质粘土卸荷回弹变形研究[J].防灾减灾工程学报,2011,31(04):397-402.

侯晓亮, 周建华, 赵晓豹, et al. Research on Unloading Rebound Deformation of Muddy Silty Clay at Hexi District in Nanjing City[J]. 2011, 31(4): 397-402.
[1]侯晓亮,周建华,赵晓豹,李晓昭.南京河西淤泥质粉质粘土卸荷回弹变形研究[J].防灾减灾工程学报,2011,31(04):397-402. DOI： 10.13409/j.cnki.jdpme.2011.04.006.

侯晓亮, 周建华, 赵晓豹, et al. Research on Unloading Rebound Deformation of Muddy Silty Clay at Hexi District in Nanjing City[J]. 2011, 31(4): 397-402. DOI： 10.13409/j.cnki.jdpme.2011.04.006.

摘要

通过大量室内固结回弹试验

研究了南京河西地区淤泥质粉质粘土的卸荷回弹变形规律。固结-回弹-再压缩曲线表明该地区淤泥质粉质粘土的弹性变形要比其塑性变形量小得多

卸荷再压缩后

土体的压缩性也明显降低;通过分析卸荷比和回弹率、回弹应变以及回弹模量的关系曲线

确定了该地区淤泥质粉质粘土的临界卸荷比和极限卸荷比指标

从而可以确定开挖卸荷的影响深度范围。卸荷回弹变形随着卸荷滞留时间的增长

有先增大后减小的特点。试验结果表明

在卸荷与加荷作用下

土体的变形特性、变形模量有着明显差别。

Abstract

With the rapid development of economic construction

the rebound deformation analyses are needed in many engineering projects.Through large numbers of consolidation-rebound tests

rebound deformation characteristics of muddy silty clay at Hexi district in Nanjing city under unloading have been studied.It indicates that the elastic deformation of muddy silty clay is much smaller than its plastic deformation and the compressibility of muddy silty clay is reduced significantly when it is compressed again after unloading.By analyzing the relationships of resilience ratio

resilience strain and resilience modulus to unloading ratio

the critical ratio and the ultimate ratio that can be used to estimate the depth of unloading influence are confirmed.The rebound deformation under unloading increases with the residence time before decrease.The test results show that the behaviors of deformation and deformation modulus under unloading conditions are much different from those under loading conditions.

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references

土体卸荷回弹实验研究 [J]. 张淑朝,张建新,任杰东,张阳. 河北工程大学学报(自然科学版) . 2008(03)

卸荷作用下淤泥变形规律的试验研究 [J]. 师旭超,汪稔,韩阳. 岩土力学 . 2004(08)

深基坑卸荷回弹问题的研究 [J]. 潘林有,胡中雄. 岩土工程学报 . 2002(01)

上海地区软粘土的卸荷—再加荷变形特性 [J]. 陈永福,曹名葆. 岩土工程学报 . 1990(02)

工程岩土学[M]. 地质出版社 , 唐大雄等修订, 1999

土力学与地基基础[M]. 武汉工业大学出版社 , 陈书申,陈晓平主编, 1997

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