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| 1 | Dynamic properties of polyurethane foam adhesive-reinforced gravels显示文摘Polyurethane foam adhesive(PFA)has been introduced as an alternative stabilizer in geotechnical applications because PFA can improve the engineering characteristics of soil by filling the pore space and generating adhesive bonding among the particles.However,the dynamic properties of PFA-reinforced soils are not well understood.To analyze the dynamic characteristics of PFA-reinforced gravels,a series of cyclic triaxial tests were carried out to investigate the shear modulus and damping ratio of PFA-reinforced gravels,and to determine the corresponding effects of the PFA content,confining pressure,consolidation stress ratio and loading frequency.The results showed that the shear modulus increased,and the damping ratio decreased as the PFA content,confining pressure and consolidation stress ratio increased.In contrast,the effect of the loading frequency,which ranged from 0.05 to 1 Hz,was negligible.A modified hyperbolic empirical model can consider the effect of the PFA content on the maximum shear modulus and predict the relationship between the normalized shear modulus and the normalized shear strain was proposed.Moreover,the upper and lower bounds of the damping ratio were also proposed. | LIU Ping MENG MinQiang XIAO Yang LIU HanLong YANG Gui | 2021 | Science China(Technological Sciences)2021，64，3： | 3 |
| 2 | 高聚物布袋桩加固淤泥质软土地基模型试验显示文摘高聚物布袋桩是加固软土地区既有建筑物地基的一种全新技术。针对其在淤泥质软土中成桩后桩径、桩体容重与注浆量的对应关系,以及成桩过程中挤土压力变化规律、超静孔隙水压力的变化趋势和分布规律等问题认识的不足,通过模型试验在淤泥质软土中进行3组不同注浆量的成桩试验和1组木桩的对比试验,并利用单桩载荷试验验证了高聚物布袋桩的承载能力。试验结果表明:相同土体中,注浆量越大,成桩后的桩径越大,对应的桩体容重也越大;成桩引起的超静孔隙水压力在同一监测距离下随着深度的增大而增大,在同一监测深度下随着与桩体距离的增大而增大,且其引起的超静孔隙水压力是木桩的2倍,能加速淤泥质软土的排水固结;经高聚物布袋桩加固后,淤泥质软土复合地基承载力最大可提高27%左右,加固效果明显。 | 石明生 李禄禄 夏洋洋 樊炳森 | 2020 | 铁道科学与工程学报2020，17，9： | 3 |
| 3 | Experimental Study on Viscosity Characteristics of Expanding Polymer Grout显示文摘The viscosity evolution for different temperatures was studied experimentally.A time-varying viscosity model was derived and the influence of the initial temperature on gel time was analyzed.The experimental results show that the viscosity of polymer grout increases exponentially with time.It can be divided into two phases.Before gelation,the viscosity variable quantity is very small.At the gel point,there is a sudden increase in viscosity.The initial viscosity and gel time decrease with the increasing initial temperature within a certain range,The study contributes to deepening understanding of the rheological properties of polymer grout,which can provide some references for polymer grouting construction. | 郝梅美 李晓龙 WANG Xinling ZHONG Yanhui ZHANG Bei WANG Fuming 张玉龙 | 2021 | Journal of Wuhan University of Technology(Materials Science)2021，36，2： | 1 |
| 4 | 抗精神病药对月经周期的影响调查分析显示文摘目的 探讨抗精神病药物对月经周期的影响。方法 对月经正常的73例女病人服药后进行半年的随访。结果 服用抗精神病药物后69.86%的病人出现月经紊乱,主要表现来潮时间推迟,经期缩短(t=8.57,P<0.001);月经紊乱者与月经正常者疗效差异显著(u=2.80,P<0.01);氯丙嗪可使部分病人经期提前,而氯氮平则无此作用(u=3.16,P<0.01)。结论 抗精神病药对月经周期影响明显。 | 张衍军 龚福敏 赵逢玉 邢茂富 | 2000 | 山东精神医学2000，13，2： | 1 |
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