摘要
针对沙漠风沙土结构松散、强度较低等特点,采用聚丙烯纤维对其进行加固。采用3种不同含水量的纤维风沙土进行三轴压缩试验,对纤维风沙土应力—应变关系曲线和强度特性及影响规律进行研究。研究表明:纤维长度为3mm的纤维风沙土,含水量为12%时表现为应变稳定型,含水量为10%时表现为应变软化型;其强度在含水量为12%时最大,含水量为10%时次之,含水量为14%时最小。纤维长度为9mm的纤维风沙土,围压为100kPa时,3种含水量均为应变稳定型;围压为200kPa和300kPa时,含水量为10%时为应变稳定型,含水量为12%和14%时为应变硬化型;其强度在含水量为14%时最大,含水量为12%时次之,含水量为10%时最小。含水量对纤维长度为3mm和9mm的纤维风沙土强度的影响规律并不一样,说明不同纤维长度的纤维风沙土含水量对其强度的影响有其自身的特点。综上所述,含水量对纤维风沙土应力—应变关系和强度有重要的影响。
Due to the features such as looseness of structure and low strength, polypropylene fiber is used to reinforce the aeolian sandy soil. Triaxial tests using fiber aeolian sandy soil with three kinds of water con- tent are carried out to investigate the stress-strain relation, strength characteristics and change rules. The results indicate that to the fiber aeolian sandy soil with the fiber length of 3mm, it shows as strain stabili- zation when the water content is 12% but it shows as strain softening when the water content is 10% the strength is the.strongest when the water content is 12%, moderate when the water content is 10%, and the weakest when the water content is 14%. To the fiber aeolian Sandy soil with the fiber length of 9mm, three kinds of water content all show as strain stabilization when the confining pressure is 100 kPai if the confining pressure is 200 kPa or 300 kPa, it shows as strain stabilization when the water content is 10%, hut it shows as strain hardening when the water content is 12% or 14% the strength is the strongest when the water content is 14%, moderate when the water content is 12%, and the weakest when the wa- ter content is 10%. The effects of water content on the strength of the fiber aeolian sandy soil with the fi- ber length of 3ram and 9ram are different, so the effects of water content of the fiber aeolian sandy soil with different fiber lengths on the strength have their own characteristics. In conclusion, water content significantly affects the stress-strain relation and strength of the fiber aeolian sandy soil.
出处
《黑龙江工程学院学报》
CAS
2012年第2期36-39,共4页
Journal of Heilongjiang Institute of Technology
基金
国家自然科学基金资助项目(51108134)
黑龙江省教育厅科学技术研究项目资助(12511566)
佳木斯市社会科学重点科研项目资助(11135)
关键词
风沙土
纤维
三轴试验
含水量
强度
aeolian sandy soil fiber triaxial test water content strength
