摘要
按纤维与干土质量的百分比0.0%,0.1%,0.2%,0.3%和0.4%配制了玄武岩纤维加筋黏土试样,在控制干密度的条件下,对试样进行了一系列三轴固结不排水剪试验。试验结果表明:(1)玄武岩纤维加筋黏土试样的破坏形态均呈鼓胀型,为明显的塑性破坏;(2)采用玄武岩纤维加筋,能够显著增加黏土的有效黏聚力,但对有效内摩擦角影响不大,当纤维掺量为0.3%时,土体的有效黏聚力最大;(3)玄武岩纤维加筋黏土的应力–应变关系总体表现为弱硬化型,可以用双曲线来拟合,在纤维掺量相同时,其拟合结果的参数b随围压的增大而减小,在围压相同时,参数b随掺量的变化规律与围压大小有关。
A series of CU triaxial tests on clay reinforced by basalt fiber are performed under controlled soil dry density conditions, and the ratio of basalt fiber content to dry soil by weight is 0.0%, 0.1%, 0.2%, 0.3% and 0.4%. The test results show that:(1) The failure of specimens are all tympanous and plastic obviously.(2) The effective cohesion of the reinforced clay soil increases obviously, but the effective internal friction angle only changes a little. The effective cohesion is the maximum under the fiber content of 0.3%.(3) The stress-strain relationships of the basalt fiber-reinforced clay soil possess weak hardening characteristics generally, and they can be fitted by hyperbolic curve. The parameter b of the fitting results decreases with the increase of confining pressure under the same fiber content, and the variation of b with the fiber content is related to the magnitude of confining pressure under the same confining pressure.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2017年第S1期198-203,共6页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51508159)
江苏省高校"青蓝工程"项目
中央高校基本科研业务费专项资金项目(2015B25914
2016B20214
2016B06114)
