多层土壤接地网设计的机辅分析方法

提出了基于计算机辅助分析的变电站接地网设计方法。主要内容包括：从现场实测在接地电阻率出发,得到多层土壤结构模型;计算出多层不均匀土壤条件下不同地风结构,包括立体地网的接地电阻;分析并设计得到更经济合理的地网;同时给出地网的电位分布。     

扩底桩在层状软土地基中的工程实践

根据福州地区层状软土地基中,利用薄硬夹层作为扩底桩持力层的工程实践,对其工作机理、计算方法与经济效果等问题进行探讨。     

关键层运动对覆岩及地表移动影响的研究

采用实验、０实测及数值模拟方法,研究了关键层对覆岩及地表移动的控制作用和关键层破断块度对其位移曲线形态的影响,提出了“砌体梁”结构位移曲线的拟合方程;对关键层与表土层间耦合关系进行了研究,提示了关键层与表土层间合关系的一些基本规律,对改进地表下沉预计方法具有指导意义。     

深厚软土地区搅拌桩复合地基的沉降计算与实测分析

通过工程实例,介绍了深厚软土地区搅拌桩复合地基以不同的计算模式计算的沉降结果与实测沉降量的差异性,以及复合地基静载荷试验检测的沉降量与建筑物实际沉降量的差异性;分析了建筑物沉降与区域地面沉降,建筑物基础尺寸及基础埋深等因素的关系;论证了类似条件下复合地基沉降计算模式选择的合理性。     

道路软基处理水泥土室内配比试验研究

通过室内配比试验了解掺灰量,龄期和土质对水泥土抗压强度的影响,为软基处理水泥土的设计和施工提供科学依据。     

土性相关距离计算的非线性曲线拟合法

该文根据Vanmarcke提出的土层概率模型、土性相关距离的定义及方差折减函数I2（h）的基本性质,在递推空间平均法的基础上,提出了曲线拟合法计算相关距离,并从理论上证明了其方法的合理性。该方法克服了以往计算结果受人为影响较大的不足。     

Alpha-stable分布粗糙土壤表面电磁散射研究

采用空间域合成法生成高度起伏遵守Alpha-stable分布的粗糙土壤表面,运用矩量法研究了锥形入射波入射时粗糙土壤表面的电磁散射特性.数值计算了散射系数随散射角的变化关系,分析了稳定性系数、归一化尺度参数、互相关长度、入射波频率、土壤湿度对散射系数的影响.结果表明,稳定性系数、归一化尺度参数、互相关长度、入射波频率、土壤湿度对散射系数均有较大的影响,遵守不同的规律.     

Phragmites stimulation and natural attenuation of indigenous microbial community accelerated bioremediation of oil contaminated soil

Illumina high-throughput sequencing method was used to reflect fluctuation of indigenous microbial community during phragmites stimulation process in this study. Results showed Proteobacteria, Fimicutes, and Actinobacteria were most influential in process, Firmicutes and Deinococcus-Thermus were positively affected by nutrient amendment. Firmicutes can be seen as indicator of degradation rate. Dietzia, Salinimicrobium, and Halomonas were the most dominant genus in both Phragmites and Blank setups. These results indicated phragmites addition improved the efficiency of biodegradation and significantly regulated the microbial community structure and functions during remediation process.     

Bearing capacity of isolated square footing resting on contaminated sandy soil with crude oil

The main objective of this paper is the evaluation of bearing capacity of isolated square footing resting on clean and oil-contaminated sand. The study is aimed at determining the effect of percentage of oil content in sand and the depth of the contaminated sand layer under the footing on the bearing capacity of footing. A series of routine laboratory tests were carried out on sand to obtain the physical, mechanical, and chemical properties. Crude oil is used as a contamination material. The research-included the completion of experimental work that consists of a series of loading tests carried on model of isolated square footing resting on clean and oil-contaminated sand. The contaminated sand layers were prepared by mixing the sand with crude oil at percent (10 and 20) % by weight of dry sand to simulate the field conditions. The depth of contaminated sand layer (d) under the footing was chosen depending on the footing width (B) as expressed by (d/B) ratio and varied as (0.5, 1, 1.5 and 2) to simulate the field conditions. The results showed that the contamination influences the load-settlement curves and leads to a reduction in its bearing capacity. The bearing capacity of the footing decreases significantly with increasing both the percentage of oil content and the depth of the contaminated sand layer. The results also showed that the presence of oil in sand changes the mode of shear failure in sand under the footing from local shear failure to the punching shear failure.     

多环芳烃污染土壤的化学氧化处理研究

以国内某焦化企业场地多环芳烃污染土壤为研究对象，研究了过硫酸钠作为氧化剂时，硫酸亚铁或次氯酸钠助剂的使用对修复效率的影响，同时通过对比阐述了硫酸亚铁及次氯酸钠在过硫酸钠氧化体系中的不同作用。结果表明：微量硫酸亚铁对过硫酸钠氧化土壤中多环芳烃起到催化作用，可显著提高多环芳烃去除效率；次氯酸钠可与过硫酸钠协同使用，达到共氧化的目的。