Study on treatment of karst foundation by dynamic compaction

Authors

LYU Jiang, Hangzhou Transportation Investment and Construction Management Group Co., Ltd., Hangzhou, Zhejiang 310024, China
ZHAO Hui, Hangzhou Transportation Investment and Construction Management Group Co., Ltd., Hangzhou, Zhejiang 310024, China
YANG Biao, College of Civil Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310023, China

Abstract

Dynamic compaction is a commonly used method for treating karst foundations with cavities; however, the design parameters of dynamic compaction under different working conditions lack clear standards. This paper employs the finite element software Abaqus to simulate the effects of surrounding rock quality and karst roof thickness on the stability of karst cave roofs during dynamic compaction treatment. The results indicate that the vertical displacement and maximum tensile stress of karst cave roofs are negatively correlated with roof thickness. For Grade II and III surrounding rocks with better properties, no cave collapse occurred after dynamic compaction treatment. In contrast, for Grade V surrounding rocks with poorer properties, no collapse occurs when the cave roof thickness exceeds 3 m, while treatment requires 2,000 kN·m of compaction energy for roof thicknesses below 2 m, 4,000 kN·m for thicknesses between 2 and 3 m, and 6,000 kN·m to break through and backfill the cave when the thickness is approximately 3 m.

Publication Date

5-11-2023

DOI

10.14048/j.issn.1671-2579.2023.02.005

First Page

26

Last Page

30

Submission Date

March 2025

Recommended Citation

Jiang, LYU; Hui, ZHAO; and Biao, YANG (2023) "Study on treatment of karst foundation by dynamic compaction," Journal of China & Foreign Highway: Vol. 43: Iss. 2, Article 5.
DOI: 10.14048/j.issn.1671-2579.2023.02.005
Available at: https://zwgl1980.csust.edu.cn/journal/vol43/iss2/5

Reference

[1] 彭晖. 强夯及注浆法在娄新高速公路下伏岩溶治理工程中的应用研究[D]. 长沙: 中南大学, 2013. PENG Hui. Study on the application of dynamic compaction and grouting method in the Karst treatment project under Louxin Expressway[D]. Changsha: Central South University, 2013. [2] 胡涛, 魏婷, 张超, 等. 强夯法处理娄新高速公路岩溶塌陷地基的现场试验研究[J]. 铁道科学与工程学报, 2014, 11(5): 118-124. HU Tao, WEI Ting, ZHANG Chao, et al. Experi mental study on dyna mic co mpaction method applied in Karst collapse Fou ndation of Lou-Xin expressway[J]. Journal of Railway Science and Engineering, 2014, 11(5): 118-124. [3] GUTIÉRREZ F, PARISE M, DE WAELE J, et al. A review on natural and human-induced geohazards and impacts in karst[J]. Earth-Science Reviews, 2014, 138: 61-88. [4] 李士友. 杭金衢高速公路溶洞发育区地基处理技术研究[D]. 杭州: 浙江大学, 2005. LI Shiyou. Study on foundation treatment technology in Karst cave development area of Hangjinqu Expressway[D]. Hangzhou: Zhejiang University, 2005. [5] 袁腾方. 岩溶区高速公路路基强夯处治技术及其稳定性分析[D]. 长沙: 湖南大学, 2018. YUAN Tengfang. Dynamic compaction treatment technology and stability analysis of expressway subgrade in Karst area[D]. Changsha: Hunan University, 2018. [6] 何春保, 姜志全. 垫层强夯法在岩溶地貌地基处理中的试验研究[J]. 长江科学院院报, 2014, 31(8):60-65. HE Chunbao, JIANG Zhiquan. Dynamic consolidation on cushions for karst landform foundation treatment[J]. Journal of Changjiang River Scientific Research Institute, 2014, 31(8):60-65. [7] 黄赫, 李凤岭, 马永峰, 等. 岩溶地质条件下双层强夯地基处理效果分析[J]. 石油工程建设, 2017, 43(1): 6-12. HUANG He, LI Fengling, MA Yongfeng, et al. Foundation treatment effect analysis of two-layer dynamic compaction in Karst geological condition[J]. Petroleum Engineering Construction, 2017, 43(1): 6-12. [8] 张道玲. 岩溶地质特征下的溶洞地基处治研究[J]. 城市道桥与防洪, 2020(4): 164-167. ZHANG Daoling. Study on treatment of Karst cave foundation under Karst geological characteristics[J]. Urban Roads Bridges & Flood Control, 2020(4): 164-167. [9] LYSMER J, WAAS G. Shear waves in plane infinite structures[J]. Journal of the Engineering Mechanics Division, 1972, 98(1): 85-105. [10] 蔡袁强, 陈超, 徐长节. 强夯加固回填土地基的三维数值模拟[J]. 岩土力学, 2007, 28(6): 1108-1112. CAI Yuanqiang, CHEN Chao, XU Changjie. Three-dimensional numerical simulation of dynamic compaction of backfilled soil[J]. Rock and Soil Mechanics, 2007, 28(6): 1108-1112. [11] ZHANG L, YANG G Q, ZHANG D L, et al. Field test and numerical simulation of dynamic compaction of high embankment filled with soil-rock[J]. Advances in Civil Engineering, 2019, 2019(1): 6040793. [12] 宋修广, 周志东, 杨阳, 等. 强夯法加固无黏性土路基的现场试验与数值分析[J]. 公路交通科技, 2014, 31(3): 1-6, 37. SONG Xiuguang, ZHOU Zhidong, YANG Yang, et al. Field test and numerical analysis of dynamic compaction on cohesionless soil subgrade[J]. Journal of Highway and Transportation Research and Development, 2014, 31(3): 1-6, 37. [13] 刘汉龙, 高有斌, 曹建建, 等. 强夯作用下接触应力与土体竖向位移计算[J]. 岩土工程学报, 2009, 31(10): 1493-1497. LIU Hanlong, GAO Youbin, CAO Jianjian, et al. Calculation of contact stress and soil vertical displacement under dynamic compaction[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(10): 1493-1497. [14] 范文超, 蔡新, 徐宝明, 等. 强夯荷载作用下地基竖向位移数值分析[J]. 水利水电科技进展, 2018, 38(4): 75-80. FAN Wenchao, CAI Xin, XU Baoming, et al. Numerical analysis of vertical displacement of foundation under dynamic compaction load[J]. Advances in Science and Technology of Water Resources, 2018, 38(4): 75-80. [15] 孙箭林. 钻爆法施工下穿既有隧道的影响研究[D]. 长沙: 中南大学, 2014. SUN Jianlin. Study on the influence of drilling and blasting construction under existing tunnel[D]. Changsha: Central South University, 2014.