Strength and deformation characteristic of soil-rock mixture and settlement prediction in high filled projects
YANG Xiaohui1，2，ZHU Yanpeng1，2，GUO Nan1，2
(1. School of Civil Engineering，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education，Lanzhou University of Technology，
Lanzhou，Gansu 730050，China)
Abstract：Shear tests and compression tests were carried out for soil samples of different initial water contents and initial dry densities in order to investigate the strength and deformation of soil-rock mixture in high filled projects. The shear strength and deformation of different soil-rock ratios varying with initial parameters were analyzed in detail. The smaller the initial degree of compaction is，the larger the confined compression strain of the specimen is. The larger the initial water content is，the larger the confined compression strain of the specimen is. The compression coefficient increases firstly and then decreases with increasing the vertical pressure. The compression modulus increases with rising the vertical pressure. The initial degree of compaction in the similar hill filled projects should be controlled to be more than 0.93，the initial water content should be controlled around the optimum water content within 2% to 3% of error，and the soil-rock ratio should be controlled between 2∶8 and 4∶6. The relationship between the dry density of the compacted mixture of silty clay and sandy mudstone and the vertical pressure is a power function. An algorithm was established to predict the strength and settlement according to the initial state and the loads of filled soil layer. The difference of settlement caused by the different compaction coefficient in the range of optimum water content is small. The settlement and deformation of foundation decrease obviously with the increase of compaction coefficient. The influence of compactness on the settlement of foundation when the ratio of soil to rock is 2∶8 is greater than when the ratio of soil to rock is 4∶6.
杨校辉1，2，朱彦鹏1，2，郭 楠1，2 . 高填方土石混合料强度与变形特性及沉降预测研究[J]. 岩石力学与工程学报, 2017, 36(7): 1780-1790.
YANG Xiaohui1，2，ZHU Yanpeng1，2，GUO Nan1，2. Strength and deformation characteristic of soil-rock mixture and settlement prediction in high filled projects. , 2017, 36(7): 1780-1790.
[1] LI P Y，QIAN H，WU J H. Accelerate research on land creation[J]. Nature，2014，510：29–31.
[2] 朱才辉. 深厚黄土地基上机场高填方沉降规律研究[博士学位论文][D]. 西安：西安理工大学，2012.(ZHU Caihui. Settlement regularity study of loess-high filled airport foundation with large thickness[Ph. D. Thesis][D]. Xi?an：Xi?an University of Technology，2012.(in Chinese))
[3] 刘汉龙，赵明华. 地基处理研究进展[J]. 土木工程学报，2015，49(1)：96–115.(LIU Hanlong，ZHAO Minghua. Review of ground improvement technical and its application in China[J]. China Civil Engineering Journal，2015，49(1)：96–115.(in Chinese))
[4] 杨校辉，朱彦鹏，周 勇，等. 山区机场高填方边坡滑移过程时空监测与稳定性分析[J]. 岩石力学与工程学报，2016，35(增2)： 3 977–3 990.(YANG Xiaohui，ZHU Yanpeng，ZHOU Yong，et al. Time-space monitoring and stability analysis of high fill slope slip process at a airport in mountain region[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(Supp.2)：3 977–3 990.(in Chinese))
[5] 谢定义. 非饱和土土力学[M]. 北京：高等教育出版社，2015：24–75.(XIE Dingyi. Soil mechanics for unsaturated soils[M]. Beijing：Higher Education Press，2015：24–75.(in Chinese))
[6] 凌 华，殷宗泽. 非饱和土强度随含水量的变化[J]. 岩石力学与工程学报，2007，26(7)：1 499–1 503.(LING Hua，YIN Zongze. Variation of unsaturated soil strength with water contents[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(7)：1 499– 1 503.(in Chinese))
[7] 陈东霞，龚晓南，马 亢. 厦门地区非饱和残积土的强度随含水量变化规律[J]. 岩石力学与工程学报，2015，34(增1)：3 484–3 490. (CHEN Dongxia，GONG Xiaonan，MA Kang. Variation of the shear strength of Xiamen unsaturated residual soil with water content[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(Supp.1)：3 484–3 490.(in Chinese))
[8] 申春妮，方祥位，王和文，等. 吸力、含水率和干密度对重塑非饱和土抗剪强度影响研究[J]. 岩土力学，2009，30(5)：1 347–1 351. (SHEN Chunni，FANG Xiangwei，WANG Hewen，et al. Research on effects of suction，water content and dry density on shear strength of remolded unsaturated soils[J]. Rock and Soil Mechanics，2009，30(5)：1 347–1 351.(in Chinese))
[9] 胡长明，梅 源，王雪艳. 吕梁地区压实马兰黄土变形与抗剪强度特性[J]. 工程力学，2013，30(10)：108–114.(HU Changming，MEI Yuan，WANG Xueyan. Deformation and shearing strength characteristic of compacted Malan loess in Lüliang region[J]. Engineering Mechanics，2013，30(10)：108–114.(in Chinese))
[10] 朱彦鹏，杨校辉，周 勇，等. 基于含水量和密度影响的压实土抗剪强度试验研究[J]. 兰州理工大学学报，2016，42(6)：114–120. (ZHU Yanpeng，YANG Xiaohui，ZHOU Yong，et al. Experiment of shear strength of compacted soil when effect of its moisture capacity and dry density being taken into account[J]. Journal of Lanzhou University of Technology，2016，42(6)：114–120.(in Chinese))
[11] 刘保健，张军丽. 土工压缩试验成果分析方法与应用[J]. 中国公路学报，1999，12(1)：37–41.(LIU Baojian，ZHANG Junli. Application and analyzing method for soil compression test[J]. China Journal of Highway and Transport，1999，12(1)：37–41.(in Chinese))
[12] 陈开圣，沙爱民. 压实黄土变形特性[J]. 岩土力学，2010，31(4)：1 023–1 029.(CHEN Kaisheng，SHA Aimin. Study of deformation characteristic of compacted loess[J]. Rock and Soil Mechanics，2010，31(4)：1 023–1 029.(in Chinese))
[13] 黄雪峰，孔 洋，李旭东，等. 压实黄土变形特性研究与应用[J]. 岩土力学，2014，35(增2)：37–44.(HUANG Xuefeng，KONG Yang，LI Xudong，et al. Study and application of deformation characteristics of compacted loess[J]. Rock and Soil Mechanics，2014，35(Supp.2)：37–44.(in Chinese))
[14] BURLAND J B. On the compressibility and shear strength of natural clays[J]. Geotechnique，1990，40(3)：329–378.
[15] GURTUG Y. Prediction of the compressibility behavior of highly plastic clays under high stresses[J]. Applied Clay Science，2011，51(3)：295–299.
[16] 杨光华. 地基沉降计算的新方法[J]. 岩石力学与工程学报，2008，27(4)：679–686.(YANG Guanghua. New computation method for soil foundation settlements[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(4)：679–686.(in Chinese))
[17] JIANG X G，CUI P，GE Y G. Effects of fines on the strength characteristics of mixtures[J]. Engineering Geology，2015，198(1)：78–86.
[18] 郭庆国. 粗粒土的工程特性及应用[M]. 郑州：黄河水利出版社，1998：40–42.(GUO Qingguo. Engineering characteristics and application of coarse grained soil[M]. Zhengzhou：Yellow River Water Conservancy and Hydropower Press，1998：40–42.(in Chinese))
[19] ZHU Y P，YANG X H，SHI Z B. Design and installation of comprehensive instrumentation system of high-fill foundation in mountainous airport[C]// Proceedings of the 6th Asia-Pacific Conference on Unsaturated Soils. Guilin：[s. n.]，2015：733–740.
[20] 朱彦鹏，杨校辉，王秀丽，等. 高填方变形无线远程综合监测系统及安装监测方法[P]. 中国：CN201510555457.3.(ZHU Yanpeng，YANG Xiaohui，WANG Xiuli，et al. comprehensive monitoring system of remote wireless and installation monitoring method on the high filled deformation[P]. China：CN201510555457.3. (in Chinese))
2017, Vol. 36 
