为保证那丘隧道特大型溶洞地段主体结构的施工质量与结构稳定性,在隧道底部溶腔已处治的基础上,提出了主洞洞身开挖与初期支护施工技术,并运用FLAC3D对特殊断面的开挖施工进行模拟,通过分析围岩位移与结构应力计算结果,对岩溶整体结构开挖与支护效果进行了评价.结果表明,围岩最大位移为5 mm,支护结构应力小于设计抗压强度,均符合施工设计规范指标.最后,结合现场监测数据与数值模拟结果,通过对比分析,验证了实际施工技术的合理性,可为类似工程提供参考.

For the highway tunnels crossing the super-large karst cavity, the complexities of the cavity profile and the stratigraphic direction will inevitably affect the construction of the tunnel structure. The karst cave treatment is of great significance to the safety of the tunnel construction and the safety of the tunnel structure. In order to solve the problem of steep slope pile foundation construction in the bottom empty area of the Naqiu tunnel, the authors have established a set of construction method of pile foundation in steep slope based on backfilling,and some key technologies of the construction method are emphatically put forward. Finally,some relevant construction quality control points of the pile foundation are put forward according to the construction sequence characteristics.

Based on the microscopic rock mechanics and the digital detailed measure of morphology characteristics in the joint surface, the numerical model was built to simulate the direct shear test of the fracture rock surface in the Tongkeng zinc/copper mine. The parameters of joint were back analyzed by the software PFC2D(particle flow code). The mechanical parameters of the rock mass structure were obtained and predicted by back analysis method from the numerical shear test. Numerical simulation results showed: The main failure is the interfacial shear slip under the smooth joint surface; The cohesion of the structure surface is 0.45 MPa, and the internal friction angle is 35.8° in Tongkeng zinc/copper mine; it is consistent between the simulated results and the results of the Gaofeng Mine.

The current analysis method of pile foundation under horizontal load are analyzed comprehensively.First,mechanics model of rigid pile in slope considering pile lateral stress is established. Second,according to the principle of limit equilibrium,the bending moment and stress equilibrium equation of rigid pile in slope under lateral load are proposed.Then the pile lateral ultimate bearing capacity and horizontal resistance coefficient along the depth increasing linear are developed using p y curve method. The proposed method is applied in the case study,and the results verified the rationality and feasibility of this method by comparative analysis with the existing finite element calculation methods.Finally,the method is used to perform a series of parametric analyses,such as angle of slope,pile soil contact surface coefficient and horizontal resistance coefficient,and some significant conclusions are drawn.The slope Angle,contact surface coefficient of pile and soil has significant impact on the load displacement curve of rigid pile,and the resistance coefficient of pile side soil impact load displacement curve of is not obvious under the action of the lateral load.

为了使得云计算不仅满足调度任务的QoS要求,且尽可能地最大化其服务收益,从云服务提供方的角度出发,提出了一种成本驱动的云计算任务调度策略.提出的方法在满足用户任务QoS约束的前提下,以最大化云环境单位计算开销的服务收益作为其调度目标,在此基础上建立相应的任务调度模型,最后通过遗传算法在多项式时间复杂度内对上述调度目标进行优化求解.在Cloudsim模拟器上完成了一系列仿真测试.结果表明:提出的方法在任务完成时间、调度完成时间超过调度截止时间底线的任务比例,以及云环境单位计算开销的服务收益等指标上均优于传统的Min-min算法和改进的QoS约束的Min-min算法.

As protecting the ecological environment is an important strategy of the sustainable socio-economic development,this paper starts from the analysis on many negative effects caused by social and economic development such as vegetation destruction,air pollution and soil erosion.Based on domestic and international cases of underground works in improving the ecological environment,the advantages of tunnel transport in big cities,mountainous terrain and river and water areas for protecting ecological environment are deeply analyzed and discussed.The results show that tunneling and underground space utilization can reduce the environmental pollution caused by vehicles and the destruction of mountain vegetation,ensure all-weather smooth running of traffic without affecting the waterway shipping,and improve the efficiency of land use and urban defense capability to resist natural disasters and spoils of war.The practice shows that the utilization of underground space such as tunnel engineering is one of the most effective ways to protect the ecological environment for achieving sustainable economic development.

To overcome the limitation of the traditional RF cable payoff control system on the control accuracy and the robust performance,the internal model control system is built which is based on the T-S fuzzy model of RF cable payoff system,the internal model controller(the reversed T-S model) of the payoff system.The test result shows that the new control system has better control accuracy than that of inverter + motor PID control system and the new control system is much more robust than before.

贝叶斯分类方法因具有严密的数学理论基础,于是成为一种简单而有效的数据挖掘方法;然而,贝叶斯分类器要求——条件独立性假设和每个属性权值为1,这极大降低了贝叶斯分类器的性能;针对贝叶斯分类器的局限性,文章提出了一种优化的贝叶斯分类算法;文中,首先利用粗糙集理论对待分类数据集进行属性约简,删除冗余属性;然后给出了属性权值的计算方法和公式,目的在于更准确地描述数据集的重要性和相关性;同时,通过weka3.6.2工具,以UCI机器学习数据库中的数据集为测试数据,进行了对比测试;实验结果表明:OBCA具有较高的分类准确率。

Load dispatching strategy is proposed based on the heat balance mechanism.We use new temperature prediction mechanism,with less expense for accurate prediction of heat,based on the kernel level scheduling so that a single socket uniform heat distribution.In each socket,use the SLS strategy to balance its power consumption.Under the condition of power equilibrium,fine-tune overcome local hot spots appear,finally,the cooling fans' speed average and stable distribution,so as to minimize the fan speed to provide server cooling needed for convection heat transfer.Experiment shows that the new scheme can reduce cooling system power consumption at eighty percent,it is a excellent method.

运用案例组织教学已为许多计算机基础课教师所关注,但在运用该教学方法中教学案例选择设计的科学性、教师与学生在案例教学中的适应性、案例教学法与其他教学方法的兼容性等问题仍未得到有效解决。本文认为,运用案例教学法开展计算机基础课教学,需要充分考虑学生的专业知识结构、优选教学案例、创新教学方法、完善教学评价体系、有机结合其他教学方法等,使案例教学法更加具有针对性和实效性。

To solve the shortcomings of asynchronous disaster-tolerant which suffer from network attacks and bad traffic,a compound encryption logs disaster-tolerant method was proposed,the excursive disks were used to store the writing operation logs in native node and backup node,when writing operation,the logs were stored in native disk and divided into some sessions which were optimized to reduce the unnecessary logs,then were encrypted and send to backup node.The dynamic key method was adapted for encryption algorithm,some hash functions were used for verifying transferred logs by network.After performed operation according to optimized logs,the corresponding logs were deleted in native node and backup node.The presented method has some advantages,such as small transmission quantity,high safety and good resistance to aggressive.The experiments show the new method almost no affects the native node performance,the small quantity of net transmission.

在分布式文件系统中,小文件的管理一般存在访问性能较差和存储空间浪费较大等缺点.为了解决这些问题,提出了一种性能优化的小文件存储访问（SFSA）策略.SFSA将逻辑上连续的数据尽可能存储在物理磁盘的连续空间,使用Cache充当元数据服务器的角色并通过简化的文件信息节点提高Cache利用率,提高了小文件访问性能;写数据时聚合更新数据及其文件夹域中的相关数据为一次I/O请求写入,减少了文件碎片数量,提高了存储空间利用率;文件传输时利用局部性原理,提前发送批量的高访问率的小文件,降低了建立网络连接开销,提升了文件传输性能.理论分析和实验证明,SFSA的设计思想和方法能有效地优化小文件的存储访问性能.

Data is increasingly becoming the core of customer value,to protect customer value a method of disaster tolerance must be designed.This paper analysise the theory of disaster tolerance and IPSAN then designed an remote data replication method based log,it decrease net traffic by write coalescing and asynchronous writing and can recover damage date,simulation shows it is a excellent disaster tolerance method.

The combination of a newly developed low pressure pulse valve with a diameter of 100 mm is optimized by orthogonal test,and compared to the small-sized valve,the jetting performance and technical economic performance of the large-sized low-pressure pulse valve has widespread application market,better than the small one,the valve body resistance is decreased with the rise of diameter.So it can be widely applied.

After being incinerated,the adhesion of waste steel,greasy dirt and rubber,creates large amount of fume and dust,which is dangerous for people's health,especially during the producing process,massive discharge causes serious pollution to the surrounding environment.The article briefly introduces the efficacy of waste steel incinerating purification system in Wuhan Iron and Steel Group Mental Resource Company,in which the waste steel with adhesion of greasy dirt and rubber is incinerated in a special hood,the desulphurization and dust removal process is conducted and then the cleaned waste steel is put in the smelting so that the pollution is reduced and the recycling of waste steel is ensured.

Emulsified wastewater from mechanical process is treated by method of demulsification and flocculation.The results show that: The best demulsifier is concentrated sulfuric acid and the oil content can be reduced from 8 670 mg/L to below 30 mg/L when dosage of acid is 0.5%(volume ratio);COD can be reduced to 480 mg/L when dosage of PAM is 50 mg/L and wastewater is slightly alkaline.According to the experimental results and situation in the enterprises,the process of acidification demulsification-neutralization-flocculation is presented.The final effluent can be directly discharged into urban drainage systems.

The article uses the safety management in WISCO Machinery Manufacturing Co.,Ltd as the example,takes the collection,investigation,conclusion,statistics and analysis of the company′s industrial accident by mathematical statistics method,and takes necessary safety education and corrective and remedial measure on typical accident to sharply decrease the safety accident and improve the profit of the whole company.

Montmorillonite was activated by acid and then polymerized with alkali to prepare poly- montmorillonite-based flocculant(PMT),and was used for removal of TOC and chroma in dyeing wastewater.The experimental results show that:Under the optimum conditions of PMT dosages 0.30 g/L for 2BLN,0.30 g/L for KNR and 0.25 g/L for X-3B,the TOC removal rates of the 3 kinds of simulated dyeing wastewater are 77.0%,89.2%,39.5%,the chroma removal rates are 41.2%, 43.1%,57.4%,respectively.The TOC removal rates of KNR and 2BLN actual wastewater by PMT are 91.6% and 88.4%,which are higher than those by PAC and PFS,whereas the TOC removal rate of X-3B actual wastewater and the chroma removal rates of the 3 kinds of actual dyeing wastewater by PMT are all lower than those by PAC and PFS.

With the development of network and the rapid growth of data size,it becomes more and more important to share the data storage effectively.The paper analyses the shortages of traditional SCSI storage and NAS storage,and the advantages of SAN storage method,then designs a new net storage shared system based on SAN architecture.The new system is easy to management and convenient to share,and overcomes the shortages of limited storage capacity of SCSI and NAS.It also overcomes the influence of network bandwidth,we think it is a storage system.with good foreground.

With the explosive expanding of the data storage, the data storage is facing the unprecedented storage challenge. The traditional storage architecture exits function bottleneck and single-point invalidation of server. So we bring forward a new storage architecture based on Embedded System and analysis its hardware platform, finally we design this architecture.