Experimental study on dynamic deformation and dynamic strength of expansive soil modified by phosphorus tailings

被引：0

作者：

Zhuang X. ^{[1
]}

Zhuang T. ^{[1
]}

Tao G. ^{[1
]}

Zhao H. ^{[1
]}

Li Y. ^{[1
]}

机构：

[1] School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2020年 / 39卷

基金：

中国国家自然科学基金;

关键词：

Dynamic elastic modulus; Dynamic strength; Expansive soil; Phosphorus tailings; Soil mechanics;

D O I：

10.13722/j.cnki.jrme.2019.0776

中图分类号：

学科分类号：

摘要：

The εd-σd relationship, dynamic elastic modulus and dynamic strength was studied under different confining pressure and Phosphorus tailings by GDS dynamic triaxial test. The experimental results show that the dynamic strain-dynamic stress(εd-σd) curves of the improved soil rise first and then decrease with the increase of phosphorus tailings, and the optimal dosage is 7%. The dynamic elastic modulus Ed decreases with the increase of the dynamic strain εd, When εd≤0.2%, the dynamic elastic modulus decreases rapidly. When εd>0.2%, the soil enters the plastic development stage, and Ed decreases and becomes slow. The dynamic strength curve conforms to the power function relationship; Dynamic strength increases with the increase of confining pressure, and increases first and then decreases with the increase of phosphorus tailings content. Compared with pure expansive soil, the modified soil dynamic strength increases by about 40 kPa, and the increase is about 30%. The improved soil dynamic cohesion cd increases first and then decreases with the increase of phosphorus tailings content; Compared with pure expansive soil, cd increases by about 9 kPa, and the increase is about 36%. The amount of phosphorus tailings has little effect on the internal friction angle φd. The dynamic strength calculation formula is given by nonlinearly fitting the relationship between dynamic strength parameters and phosphorus tailings. © 2020, Science Press. All right reserved.

引用

页码：3032 / 3038

页数：6

共 16 条

[1]

SUN Dean, LI Xuan, Dynamic deformation characteristics of unsaturated silt over a wide suction range, Chinese Journal of Geotechnical Engineering, 41, 4, pp. 617-624, (2019)

[2]

CHEN Cunli, YANG Peng, HE Junfang, Research on dynamic characteristics of saturated compacted loess, Rock and Soil Mechanics, 28, 8, pp. 1551-1556, (2007)

[3]

WANG Qian, LI Na, WANG Ping, Et al., Behaviors of dynamic modulus and damping ratio of loess in Gannan region of Gansu Province, Chinese Journal of Geotechnical Engineering, 39, pp. 192-197, (2017)

[4]

CAI Huiteng, JIN Xing, Testing study on dynamic shear modulus and damping ratio of silty clay in Fuzhou downtown area, China Civil Engineering Journal, 44, pp. 110-113, (2011)

[5]

ZHANG Ru, HE Changrong, FEI Wenping, Et al., Effect of consolidation stress ratio on dynamic strength and dynamic pore water pressure of soil, Chinese Journal of Geotechnical Engineering, 28, 1, pp. 101-105, (2006)

[6]

ZHANGYanmei, RUAN Donghua, CHENG Zhiliang, Experimental study on dynamic characteristics of texsol, Journal of China University of Petroleum: Natural Science, 39, 2, pp. 119-123, (2015)

[7]

WANG Zhijie, LUO Yasheng, WANG Ruirui, Et al., Experimental study on dynamic shear modulus and damping ratio of undisturbed loess in different regions, Chinese Journal of Geotechnical Engineering, 32, 9, pp. 1464-1469, (2010)

[8]

WANG Y X, GUO P P, REN W X, Et al., Laboratory investigation on strength characteristics of expansive soil treated with jute fiber reinforcement, International Journal of Geomechanics, 17, 11, pp. 1-12, (2017)

[9]

MAO Cheng, QIU Yanjun, Testing study on dynamic properties of expansive soil and improved expansive soil [J], Chinese Journal of Rock Mechanics and Engineering, 24, 10, pp. 1783-1788, (2005)

[10]

LI Xing, Experimentalstudyondynami ccharacteristicsofhigh-speedrailway-basedcementmodifiedexpansivesoilunderdry-wetcycle, 6

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