郴州市狮子山隧道工程水文地质特征分析

为研究某隧道工程建设场地的水文地质特征及岩土工程地质特征,对相关隧址区进行了工程地质、水文地质工程详细勘察,并对隧道围岩岩性及其工程地质特征、隧道洞口及洞身稳定性、场地水文地质特征等进行了评价,为该隧道工程的设计、施工提供了定量参数指标,提出了相应的施工建议。     

软弱岩段大跨度斜井挑顶施工技术

<正>铁路隧道由辅助坑道转为正洞施工时,由于开挖断面突变,引起围岩应力重新分布,稍有不慎便会产生坍塌,软弱围岩隧道亦是如此。为此,本文依托玉磨铁路景寨隧道2号支洞转正洞施工情况,详细阐述了挑顶位置的选择、斜井套拱及衬砌加固、小导洞与正洞正交进入、门梁与门架设计及施工、导洞处正洞拱架施作、导洞侧墙处支护拆除、交叉口落底加固要求等,以保证施工安全,达到控制变形要求,并为类似工程提供借鉴。     

盾构在矿山法隧道内进出洞施工关键技术

地铁等区间隧道两端多为强风化的岩层或残积土,中间较深段常遇到未风化或微风化的高强度岩层,单靠盾构法施工难以完成,多采用"矿山法+盾构法"施工。以深圳地铁某区间隧道为例,详细介绍了"矿山法+盾构法"工法中盾构在矿山法隧道内进出洞施工技术,提出了解决施工关键技术的措施,为这种新型复合工法的推广提供了良好的借鉴。     

甘肃省康县金洞子金矿地质特征

康县金洞子金矿位于甘肃省康县三河坝乡。矿床成因属接触交代中-低温热液型金矿床,其工业类型为含金石英脉型金矿床。矿区水文工程地质条件简单。矿石类型自然类型以原生矿为主,工业类型为石英脉型。金洞子金矿发现了一条金矿体为金盲矿体。围岩主要为灰-灰黑色砂质板岩,容矿岩石为细脉状、网脉状、树枝状、浸染状石英脉。矿体发育在近东西向层间挤压破碎带中。总体走向75°,倾向东南,倾角60°～74°。矿体与围岩接触界线明显。     

鹰嘴岩隧道软弱破碎岩体开挖施工技术研究

主要介绍了鹰嘴岩隧道进口洞身在Ⅱ、Ⅲ类软弱破碎岩体段开挖的施工技术，以及监控量测、安全措施等，取得了显著成效，保证了施工进度与安全，在类似工程中具有参考价值。     

穿越高层建筑群浅埋软弱岩体隧道施工力学数值模拟研究

为了研究隧道挖掘施工对支护结构、围岩应力变化以及地表变形的影响,采用有限元软件数值模拟方法对挖掘施工进行力学计算。首先分析了施工地层变形及传播规律;然后结合midas GTS软件建立了高层建筑群附近的软弱围岩隧道施工力学模型;最后通过围岩应力、初支应力以及二衬应力计算得出以下几点结论:模拟施工首先进行右洞开挖,右洞下台阶开挖导致洞口两侧受力不均,周边收敛值达到5. 74 mm,增幅高达133%,现场施工时需注意减小开挖幅度,避免洞口两侧受力不均问题;对初支结构应力计算得到左洞部分位置最大拉应力达到2. 31 MPa,高于C20喷射混凝土极限拉应力2. 1 MPa,施工过程需加密钢拱架。     

工程地质测绘在山区隧道勘察中的应用——以福建某隧道为例

隧道勘察前进行必要的工程地质测绘工作,通过收集资料、实地调查等手段对调查区的地形地貌、地层岩性、地质构造、不良地质等进行查明,为后续勘察方案的布置提供依据。通过对福建某隧道工程地质调绘的案例,说明地质测绘工作对隧道勘察的重要性。     

黄河沿岸砂土场地工程地质特征及拟建物基础类型选择

通过野外钻探取样编录,对场地地层进行划分,在此基础上利用室内土工试验、现场标准贯入试验、重型动力触探等成果资料进行数理统计及相关计算,结合有关规范与工程地质手册,给出了内蒙临河区某工程地基承载力的推荐值和设计需要的相关参数建议值。并且对地基土进行工程地质条件评价、持力层选取、地基处理方式提出建议,为本工程施工图设计提供了可靠的地质资料。通过根据岩土工程勘察报告和实际施工情况,分析、阐述了内蒙临河地区地基土工程地质特征及地基基础处理建议,为类似工程提供参考。     

安徽省泾县石芒坑金矿地质特征及控矿因素浅析

安徽省泾县石芒坑金矿,主要赋存于花岗闪长斑岩岩脉与志留系地层上下接触带的硅化破碎带中,也有在围岩的硅化破碎带中,为角砾岩型矿床,少量零星矿体为石英脉型,主要矿体受北西向断层控制;本文着重从矿区地质概况、矿化特征及主要控矿因素等方面阐述分析了该矿床的地质特征和矿床成因。     

抽水试验在断裂带水文地质勘查中的应用

以广州地铁二十一号线世界大观站工程为背景,介绍了该项目在断裂带中复杂的工程地质和水文地质条件,通过有针对性的抽水试验,准确的查明了场地地下水的埋藏情况和各岩土层的水文地质参数,为车站基坑设计和施工提供了可靠的水文地质参数。基坑施工结果表明水文地质参数准确,抽水试验方法有效。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.