非饱和重塑黄土强度与屈服特性试验研究 |
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引用本文: | 覃小华,黄雪峰,姚志华,张蓓,辛建平. 非饱和重塑黄土强度与屈服特性试验研究[J]. 四川建筑科学研究, 2014, 0(3): 121-124 |
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作者姓名: | 覃小华 黄雪峰 姚志华 张蓓 辛建平 |
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作者单位: | 中国人民解放军后勤工程学院军事建筑工程系;岩土力学与地质环境保护重庆市重点实验室; |
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基金项目: | 后勤工程学院2011年研究生创新基金资助项目 |
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摘 要: | 为研究非饱和重塑黄土的强度与屈服特性,在控制吸力的条件下以黄土三轴剪切试验为基础,研究了重塑黄土的应力-应变曲线、强度与屈服特性。试验结果表明:在试验控制吸力条件下,重塑黄土的破坏形式均呈塑形破坏;在同一吸力、不同净围压作用下,重塑黄土从理想塑形破坏(或弱硬化型)向强硬化型发展;在p-q面内,强度包线几乎呈直线;黏聚力c随吸力增大而增大,但内摩擦角φ变化较小;不同吸力作用下,重塑黄土的εr-log(q/p)关系曲线呈三阶段分布,得到了非饱和重塑黄土的屈服应力(ps,qs)。
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关 键 词: | 重塑黄土 吸力 强度 屈服 |
Experimental study on strength and yield properties of unsaturated disturbed loess |
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Affiliation: | QIN Xiaohua, HUANG Xuefeng ,YAO Zhihua ,ZHANG Bei ,XIN Jlanplng( 1. Department of Architectural Engineering, Logistical Engineering University of PLA, Chongqing 401331, China ; 2. Chongqing Key Laboratory of Geomechanics & Geoenvironmental Protection, Chongqing 401331 ,China) |
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Abstract: | To study the strength and yield properties of unsaturated disturbed loess, a series of triaxial shear tests of loess were done on the condition of suction control. Study the stress-strain curves, the strength and yield properties of disturbed loess. The test results show that the failure model of disturbed loess is shown with plastic failure;the stress-strain curves of disturbed loess will change from strain softening to strain hardening with different confining pressure under same suction;the strength envelope of disturbed loess is distributed with linear in the plane of p - q ; the cohesion of disturbed loess has a linear increase with the increase of suction, but the friction angle is found to have little change with the change of suction. The curves of εr-log(q/p) of loess has three-stage with different suction, and the yield stress(ps ,qs) of unsaturated disturbed loess was acquired. |
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Keywords: | disturbed loess suction strength yield |
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