毛竹顺纹抗拉性质的变异及与气干密度的关系

将毛竹轴向分段(4段)、径向分层(6层)取样,研究其顺纹抗拉弹性模量和顺纹抗拉强度的变异规律,顺纹抗拉性质与气干密度之间的关系.结果表明:毛竹的顺纹抗拉弹性模量和顺纹抗拉强度的径向变异很大,不同位置竹材的顺纹抗拉弹性模量为8.49～32.49 GPa,最外层竹材的顺纹抗拉弹性模量约是最内层的3～4倍;不同位置顺竹材顺纹抗强度在115.94～328.15 MPa之间,最外层竹材的顺纹抗强度是最内层的2～3倍.用直线方程预测毛竹顺纹抗拉性质的效果略优于曲线方程的效果.     

煤矸石在矿区公路路面基层的应用

在矿区道路建设中，煤矸石可以做路面基层材料使用。本文通过对黑龙江省七台河市主要矿区煤矸石基本物理力学性能的研究，并结合了实际工程探讨了煤矸石在公路基层应用中的问题。实践表明，道路建设中利用煤矸石在技术上是可行的，并具有明显的经济和社会效益。     

胶合板胶合效果评价方法探讨

现行胶合板标准采用传统的胶合强度指标(含木破率)评判胶合板的胶合性能具有一定的局限性。本文通过对胶合板胶合强度的分析和胶合界面的观察，包括显微观察，提出以胶合有效性、木材破坏率和胶合层剪切弹性模量或其综合评分为衡量指标，是评判胶合板胶合效果较为客观的方法。     

加热法对石膏刨花板性能影响的研究

研究了加热温度和加压时间对石膏刨花板性能的影响。试验结果表明石膏固化时加适量的热量有助于提高石膏刨花板的性能;加热温度较高时石膏刨花板的性能比常温条件下压制的板的性能低。石膏固化时是吸热反应,石膏刨花板加压固化时,外加一定的热量有助于提高石膏的固化强度,因此板具有较好的物理力学性能。     

Influence of Ammoniacal Copper Quaternary treatments on mechanical properties of blue-stained Lodgepole Pine wood

Three concentrations （2.8%, 2.0%, 1.2%） of Ammoniacal Copper Quaternary （ACQ） was selected to treat Lodgepole pine wood for evaluating ACQ treatment on mechanical properties of blue-stained wood. The bending modules of elasticity （MOE）, modules of rupture （MOR）, toughness and shearing strength parallel to grain on tangential surface, are tested according to the criteria GB1927-1943-91. Non-treated sample were also tested according to the same procedure. The results showed that the three groups specimen impregnated by different concentrations of ACQ solution met the AWPA standard 2003 of America （UC4A 6.4g/cm^3）. There were significant difference of toughness between treated wood and non-treated wood （p=0.01）, but there were no statistically significant differences among three concentrations in terms of toughness, and toughness of treated wood was approximately 20% lower than non-treated. MOR, MOE as well as sheafing strength parallel to grain were found to be not significantly different between treated wood and non-treated one, and there were no statistically significant difference among three concentrations of ACQ too. Toughness, MOR, MOE and sheafing strength parallel to grain increased with decrease of concentration of ACQ, but they were hardly affected by ACQ preservatives.     

Intratree Variability of Tensile Strength Parallel to Grain in Chinese Fir and 1-214 Poplar from Plantation

The variation of tensile strength parallel to grain in Chinese fir and 1-214 poplar wood from plantations was studied in this paper. Aaccording to the national standards The Testing Methods for Physical and Mechanical Properties of Wood （GB 1927 to 1943 -- 1991）, the small clear wood samples were cut and tested, which represent the south and north of trees with heights of 1.3, 3.3, 5.3 and 7.3 m. The results showed： the tensile strength parallel to grain of the north wood was higher than that of south wood. ANOVA shows that the tensile strength parallel to the grain with height is of significant difference （at 0.05 level）.     

林木根系与黄土复合体的三轴试验

以林木根系为研究对象,将根系与土壤视为一个整体,用三轴压缩试验方法研究根土复合体的应力-应变及强度特性,探讨不同根系直径、根系分布方式、复合体含水量和围压下的极限主应力差和加根效果,得出根土复合体的强度指标.结果表明:根土复合体在含水量相同的情况下,随根径增大,复合体的强度提高率增大.水平根的根土复合体随含水量增加,复合体的强度提高率减小;垂直根和复合根的复合体随含水量增加,复合体的强度提高率增大.垂直根和复合根的根土复合体能明显提高土体的强度,水平根的根土复合体对于提高土体强度效果不是很明显.     

硬岩抗剪强度参数的最优化确定法

为了减小岩工程分析计算的工作量和节约研究经费,须利用有限的室内实验样本的测定值,通过对有限实验样本数据的回归分析整理,确定岩石抗剪强度参数c、φ,进而估计岩体的抗剪强度c、φ.由于试验方法、试验条件等有一定局限性,因而,岩石力学参数的试验结果具有一定的不确定性.其不确定性包含随机性和模糊性.而用传统的数理统计方法处理岩石样本值,显然是不合适的,只有通过寻求最优的数学回归分析方法,来处理相关试验结果.笔者通过对硬岩变角度剪切实验和常规三轴压缩实验的数据回归分析,得到利用最小二乘法的抛物线回归分析结果和随机-模糊回归分析结果比较符合.因而,为了优化计算结果而又避免繁琐的计算,通常可以采用最小二乘法的抛物线回归分析计算代替随机-模糊回归分析相关结果.     

西南桤木木塑复合材料的研究

采用乙烯基类系列单体——丙烯腈(AN)、甲基丙烯酸甲酯(MMA)、丙烯酸(AA)三元共聚单体注入西南桤木木材中，制成新型的高分子复合材料(AMA—WPC)。单体的注入用满细胞法，聚合用热引发法，并采用添加氯化锌对木材细胞壁进行活化等工艺对木塑复合材进行了研究和分析。实验样品按照国标GBl927—1943有关规定进行测试，并结合傅立叶红外光谱和扫描电镜探讨了各因素对AMA—WPC材料接枝率及性能的影响。结果表明：改性后西南桤木木塑复合材料具有优异的物理、力学性能。与素材相比较，AMA—WPC的密度提高了59．8％，顺纹抗压强度提高了76．7％，抗弯强度提高了90．4％，抗弯弹性模量提高22．2％，端面硬度提高102．3％，径面硬度提高153．6％，弦面硬度提高152．2％，吸水率降低56．7％，湿膨胀率降低19．0％。     

间伐小径木指接技术研究

间伐材指接胶合加工，变短材为长材，弯材为直材，为合理，有效利用间伐材开辟了新路。对间伐材木材含水率，指接端压的大小和时间，指接后养护时间，涂胶量，指榫规格等对指接材抗弯强度的影响进行了研究，并测定了苯酚，间苯二酚，甲醛树脂胶胶合的指接材快速老化性能。