›› 2015, Vol. 36 ›› Issue (2): 470-476.doi: 10.16285/j.rsm.2015.02.024

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on critical placement height of gravel column reinforced soft soil foundations

CHEN Ji-bin1, 2, ZHAO Qi-hua1, 2, PENG She-qin1, 2   

  1. 1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China
  • Received:2014-02-03 Online:2015-02-11 Published:2018-06-13

PDF (Chinese)

1616

Abstract: Calculation methods for the critical placement height of gravel column reinforced soft soil foundations are not perfect at present. The traditional calculation methods do not take the improvement of composite foundation's strength and the enhancement of foundation's drainage consolidation ability into account. Based on the consolidation theory, the simplified method of consolidation calculation of gravel column composite foundation is introduced, and it modifies the formula of the critical placement height according to the deformation control. Analyzing the settlement deformation observation data of the soft ground distributed along the Suining-Ziyang expressway in Sichuan province, results show that the thickness of clay in the study area is within 6.5-11 m and the observation value of critical placement height ranges from 4.5 to 6.5 m. The difference between observation values and calculation values with modified formula is ±(0.1-0.4)m. It verifies that the formula deduced in this paper is applicable. Based on these, the factors influencing the critical placement height were discussed and it was found that the thickness of soft soil and the column spacing have more obvious influences on the critical placement height than other factors.

Key words: gravel column, soft soil foundation, critical placement height, consolidation theory, analytical formula

CLC Number: 

  • TU 447
[1] JIN Dan-dan, WANG Su, LI Chuan-xun. Analysis of consolidation of natural heterogeneous soils with a threshold hydraulic gradient [J]. Rock and Soil Mechanics, 2019, 40(4): 1433-1440.
[2] LIU Zhong-yu, ZHANG Jia-chao, ZHENG Zhan-lei, GUAN Cong. Finite element analysis of two-dimensional Biot’s consolidation with Hansbo’s flow [J]. Rock and Soil Mechanics, 2018, 39(12): 4617-4626.
[3] LI Hong-jiang , TONG Li-yuan, LIU Song-yu, GU Ming-fen, LU Zhan-qiu,. Displacement standards for lateral capacity of rigid pile and flexible pile in soft soil foundation [J]. , 2017, 38(9): 2676-2682.
[4] XIAO Zhong, GE Bo-rui, WANG Yuan-zhan, WANG Yan, . Influence of cruciform inner clapboards on uniaxial bearing capacity and failure mode of bucket foundation [J]. , 2017, 38(11): 3136-3144.
[5] ZHOU Xiao-wen, CHEN Ling-wei, CHENG Zhan-lin, WANG Ming-yuan,. Stability controlling standard for embankment construction on soft soil ground [J]. , 2016, 37(9): 2631-2635.
[6] JIANG Jian-qing , CAO Guo-hui , LIU Re-qiang,. Field test on behaviours of marine soft soil foundation treated with plastic drainage plate and sand column combined with surcharge preloading [J]. , 2015, 36(S2): 551-558.
[7] SUN Li-Qiang , ZHANG Jing-Jing , LI Heng , YAN Shu-wang , HUO Zhi-liang , . Research on key factors influencing relative angle of prestressed concrete cylinder pipe in soft soil foundation [J]. , 2015, 36(S1): 293-298.
[8] MA Yong-feng , ZHOU Ding-heng , ZHANG Zhi-hao , CAO Li-qiao，. In-situ test on vibro-replacement stone pile in large petrochemical foundation treatment [J]. , 2015, 36(S1): 327-333.
[9] HOU Jing-jun ，HE Jun ，TANG Zheng-jun ，LIU Jun-xin ，TAN Wan-yuan，. Application of gravity retaining wall with H-shaped steel in soft soil foundation pit [J]. , 2014, 35(S1): 431-436.
[10] LEI Hong-wu, JIN Guang-rong, SHI Yan, LI Jia-qi, WANG Fu-gang, XU Tian-fu. Numerical simulation of subsurface coupled thermo-hydro-mechanical (THM) processes: Application to CO2 geological sequestration [J]. , 2014, 35(8): 2415-2425.
[11] ZHU Fu、 ZHAN Gao-feng、 NIE Lei、. Study of a calculation method of critical height of embankment on natural soft soil foundation [J]. , 2013, 34(6): 1738-1744.
[12] ZHANG Zhi-pei, PENG Hui, RAO Xiao. Numerical simulation study of grouting diffusion process in soft soil foundation [J]. , 2011, 32(S1): 652-0655.
[13] DENG Yue-bao，XIE Kang-he. Application of complementary algorithm for solving one-dimensional nonlinear consolidation [J]. , 2011, 32(9): 2656-2662.
[14] XUE Ru，LI Guang-hui. Study of model tests of soft soil foundation by dynamic drainage consolidation [J]. , 2011, 32(11): 3242-3248.
[15] SUN Li-yun, LIU Zhong-yu, YUE Jin-chao, ZHANG Jie. One-dimensional consolidation of saturated clays under cyclic loading considering non-Darcy flow [J]. , 2010, 31(S1): 62-68.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] CHU Xi-hua, XU Yuan-jie. Studies on transformation from M-C criterion to Drucker-Prager criterions based on distortion energy density[J]. , 2009, 30(10): 2985 -2990 .
[2] LI Li-ping, LI Shu-cai, CUI Jin-sheng. Experimental research on chemical grout for treating water inrush in rock mass[J]. , 2009, 30(12): 3642 -3648 .
[3] SUN Ping, PENG Jian-bing, YIN Yue-ping, WU Shu-ren. Tensile test and simulation analysis of fracture process of loess[J]. , 2010, 31(2): 633 -637 .
[4] WANG Gui-yao，LI Bin，LUO Jun，FU Hong-yuan. Study of soil-water charactiristics and matric suction measurement device for unsaturated silty soil[J]. , 2010, 31(11): 3678 -3682 .
[5] SHI Cheng-hua，PENG Li-min，LEI Ming-feng. Study of time-space united calculating method of stratum deformation caused by shield tunnel excavation[J]. , 2009, 30(8): 2379 -2384 .
[6] LU Jun-fu，WANG Ming-nian，JIA Yuan-yuan，YU Yu， TAN Zhong-sheng. Research on construction time of secondary lining of large section loess tunnel for high-speed railway[J]. , 2011, 32(3): 843 -848 .
[7] ZHUANG Hai-yang，HUANG Chun-xia，ZUO Yu-feng. Sensitivity analysis of model parameters for predicting liquefied large deformation of sand[J]. , 2012, 33(1): 280 -286 .
[8] HUANG Jun-jie ，SU Qian ，ZHONG Biao ，BAI Hao ，WANG Wu-bin . Deformation failure characteristics and influential factors of subgrade upon slope in permafrost area[J]. , 2013, 34(3): 703 -710 .
[9] HUANG Jun-yu , XU Song-lin , WANG Dao-rong , HU Shi-sheng . Investigation on dynamic multiscale model for brittle granular materials[J]. , 2013, 34(4): 922 -932 .
[10] ZHU Xing ，XU Qiang ，TANG Ming-gao ，FU Xiao-min ，ZHOU Jian-bin . Experimental study of infrasound wave generated by typical rock fracture[J]. , 2013, 34(5): 1306 -1312 .
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd