Energy method for analyzing dynamic pore water pressure model for tailing soil
LIU Shu-zhuo1, 2, LI Hui-zi1, 2, 3, SHAN Yi1, 2, LI Kang1, 2, BA Ling-zhen1, 2
1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China; 2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China; 3 Guangdong Zhonggong Architectural Design Co., Ltd., Guangzhou 510040, China
Abstract：By using the stress-controlled undrained dynamic triaxial cyclic shear tests, relationship between accumulative energy dissipation of tailing soil and pore water pressure is investigated based on the critical factors, namely, cyclic stress ratio and consolidation stress ratio. The test results indicate that, during the process of cyclic shear, the increase of pore water pressure is closely related to the accumulative energy dissipation of plastic strain and viscous properties. A critical state, when the cyclic stress ratio varies within the range of 0.205~0.238 and the consolidation stress ratio varies in 1.0~1.3, occurs between the pore water pressure and energy. Therefore, through nonlinear regression analysis, the energy model for pore water pressure of saturated tailing soil is preliminarily established based on the cyclic stress ratio and the axial-radial consolidation stress ratio, and it can be adequately employed to demonstrate the variations of pore water pressure without considering the uncertainty of cyclic loading number which can otherwise hinder the establishment of the model. In addition, the proposed model may also be a valuable source of reference for predicting the development of pore water pressure of saturated soil under cyclic loading.
刘叔灼, 李慧子, 单毅, 李康, 巴凌真. 基于能量法的尾矿土动孔压模型研究[J]. 岩土工程学报, 2016, 38(11): 2051-2058.
LIU Shu-zhuo, LI Hui-zi, SHAN Yi, LI Kang, BA Ling-zhen. Energy method for analyzing dynamic pore water pressure model for tailing soil. Chinese J. Geot. Eng., 2016, 38(11): 2051-2058.
[1] 谢定义. 土动力学[M]. 西安: 西安交通大学出版社, 1988. (XIE Ding-yi. Soil dynamics[M]. Xi'an: Xi'an Jiaotong University Press, 1988. (in Chinese)) [2] SEED H B, LYSMER J, MARTIN P P. Pore-water pressure changes during soil liquefaction[J]. Journal of the Geotechnical Engineering Division, 1976, 102(4): 323-346. [3] 徐志英, 沈珠江. 地震液化的有效应力二维动力分析方法[J]. 华东水利学院学报, 1981. (XU Zhi-ying, SHEN Zhu-jiang. 2D dynamic analysis of effective stresses of seismic liquefaction[J]. Journal of East China College of Hydraulic Engineering, 1981. (in Chinese)) [4] 汪闻韶. 饱和砂土震动孔隙水压力的产生、扩散和消散[M].天津: 中国工业出版社, 1964. (WANG Wen-shao. The generation, diffusion and dissipation of vibration pore water pressure in sature sands[M]. Tianjin: China Industry Press, 1964. (in Chinese)) [5] DOBRY R, LADD R S, YOKEL F Y. Prediction of pore water pressure build up and liquefaction of sands during earthquakes by the cyclic strain method[M]. Maryland: National Bureau of Standarts, 1982. [6] 何广讷, 李万明. 振动能量下砂土的体变与孔隙水压力[J].地震工程与工程振动, 1987(2): 89-99. (HE Guang-ne, LI Wang-ming. Volumetric deformation and pore water pressure of sand under vibration energy[J]. Earthquake Engineering and Engineering Vibration, 1987(2): 89-99. (in Chinese)) [7] 郭 莹, 刘艳华, 栾茂田, 等. 复杂应力条件下饱和松砂振动孔隙水压力增长的能量模式[J]. 岩土工程学报, 2005, 27(12): 1380-1385. (GUO Ying, LIU Yan-hua, LUAN Mao-tian, et al. Energy-based model of vibration-induced pore water pressure build-up of saturated loose sand under complex stress condition[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(12): 1380-1385. (in Chinese)) [8] YAN J, SHEN Y, HUANG G. Energy-based method for analyzing the collapse characteristics of silt subjected to changes of principal stress orientation[J]. Journal of Testing and Evaluation, 2011, 39(5): 123-131. [9] FINN W D L, BHATIA S K. Prediction of seismic pore water pressures[J]. Stockholm, 1981, 21: 201-206. [10] 徐杨青, 郭见扬. 波浪荷载下海洋土孔隙水压力内时模型的研究[J]. 岩土力学, 1991, 22(3): 43-50. (XU Yang-qing, GUO Jian-yang. Study on the model of pore water pressure of marine Soil under wave loading[J]. Rock and Soil Mechanics, 1991, 22(3): 43-50. (in Chinese)) [11] NEMAT S. NASSER A S. A unified approach to densification and liquefaction of cohesionless sand in cyclic shearing[J]. Canadian Geotechnical Journal, 1979, 16(4): 659-678. [12] 何广讷. 评价土体液化势的能量法[J]. 岩土工程学报, 1981(4): 11-21. (HE Guang-ne. Energy analysis procedure for evaluating soil liquefaction potential[J]. Chines Journal of Geotechnical Engineering, 1981(4): 11-21. (in Chinese)) [13] SL 237—1999土工试验规程[S]. 1999. (SL237—1999 Specification of soil test[S]. 1999. (in Chinese)) [14] 陈 伟, 孔令伟, 朱建群. 一种土的阻尼比近似计算方法[J]. 岩土力学, 2007, 28(增刊1): 789-791. (CHEN Wei, KONG Ling-wei, ZHU Jian-qun. Simple method to approximately determine the damping ratio of soils[J]. Rock and Soil Mechanics, 2007, 28(S1): 789-791. (in Chinese)) [15] 刘艳华. 复杂应力条件下饱和松砂振动孔隙水压力的能量模式研究[D]. 大连: 大连理工大学, 2005. (LIU Yan-hua. Energy-based model of pore water pressure build-up of saturated loose sand under complex stress condition[D]. Dalian: Dalian University of Technology, 2005. (in Chinese)) [16] ISHAC M F, HEIDEBRECHT A C. Energy dissipation and seismic liquefaction in sands[J]. Earthquake Engineering & Structural Dynamics, 1982, 10(1): 59-68. [17] 张建民, 谢定义. 饱和砂土振动孔隙水压力增长的实用算法[J]. 水利学报, 1991(8): 45-51. (ZHANG Jian-min, XIE Ding-yi. The practical algorithm for estimating shaking-induced pore-water pressure[J]. Journal of Hydraulic Engineering, 1991(8): 45-51. (in Chinese))
