某露天矿边坡稳定性分析及治理对策研究

根据数值模拟分析,判断现阶段边坡潜在破坏区域及破坏模式,结合后续开挖过程中稳定性变形发展趋势,确定现阶段边坡需要治理区域和治理方案,然后通过数值模拟方法对治理方案进行设计及效果验证。     

隐伏多空区下露天边坡坡面角优化数值分析

考虑隐伏多空区和坡面角的变化对边坡稳定性影响,采用FLAC3D对露天边坡的65°、66°和67°三种隐伏多空区下坡面角方案进行了稳定性数值模拟计算,通过坡面角的变化分析边坡的整体最大位移变化规律,应用Mohr圆定量分析了典型应力作用区域的岩体破坏程度。研究结果表明:通过三种不同坡面角方案的比选,坡面角为65°时整体边坡的位移变化最小,典型的应力作用区域均未受到明显的破坏,此研究成果为矿山安全经济设计提供了依据。     

露天边坡对地下采场覆岩稳定性影响的数值模拟研究

以某矿山露天转房柱法地下开采为研究背景,根据现场调研获得的岩土力学参数,利用FLAC3D等软件进行三维建模[1],对倾角为40°时边坡高度为90m的地下采场上覆岩层位移与应力响应特征进行数值模拟分析。研究结果表明:在露天终了边坡高度为90m倾角为40°时,地下开采完后采场上覆岩层受到开挖的扰动,稳定性降低,塑性区面积已经发育至坡面,整个岩体处于临界破坏状态,不利于矿山的安全稳定,因此建议该矿山露天终了边坡高度不超过90m。     

某堆场边坡稳定性分析及治理方案确定

为防止某松散堆积矿堆边坡发生滑坡，确保周围设施及人身安全同时扩大堆场堆积量，采用极限平衡分析法对边坡进行了安全稳定性综合计算分析。通过分析确定了堆场自然条件下许用安全系数取1.30，极端条件下许用安全系数取1.05，其下游危险系数最大；并设计了考虑基底承载的治理方案，综合经济及工程量考虑，采用上游堆置方案，共开挖矿石量47万方，确保了边坡的稳定性和安全。     

苏南某矿坑边坡稳定性分析

某苏南矿坑，由于多年开采，宕口直径约400m，深约70m，稳定性极差，崩塌、滑坡时有发生，给周边人民造成了极大的安全隐患，因此，对研究区展开工程地质研究很有必要。本文从对研究区的边坡稳定性方面进行分析，对研究区各分区的破坏模式作了详细的分析以及对比，在研究区中选取代表性剖面，对其进行稳定性评价，对各分区边坡稳定性有了定量、定性的评价结果，为后期治理方案提供了可靠的依据。     

某电站施工期高边坡稳定性三维数值模拟评价研究

边坡稳定性分析研究,一直成为岩土工程界的重大研究课题。根据对某电站施工期间工程边坡详细的野外实地调查,查阅和整理大量的资料,总结出工程区边坡工程特性,获得边坡稳定性定性评价。在建立边坡岩体稳定性研究模型的基础上,采用三维数值模拟,对高边坡开挖过程进行再现,验证所建立的地质模型或概念模型的实用性和合理性。重点分析电站施工期高边坡的稳定性,同时,也为高边坡的开挖施工及支护措施提供了许多合理的建议。     

某露天矿山边坡变形体治理方案研究

随着露天矿山开挖深度的增加而导致变形体滑坡,从而造成对露天采场的安全开采的严重困扰,影响矿山的安全生产。根据矿区的地质背景试分析影响该露天矿边坡稳定性的自然因素和人为因素,同时利用Slide数值模拟软件对其进行模拟,针对研究中出现的问题,制定了三套边坡治理方案,提出了相应的防护措施,并根据综合费用进行对比分析,最终推荐方案二为优选方案。该露天矿边坡治理方案对我国露天矿山的安全生产具有一定的参考价值和指导意义。     

高边坡底摩擦试验研究及三维数值模拟分析

为了验证某金矿初步设计的280 m高露天边坡的稳定性,首先利用底摩擦模型实验,模拟露天矿的开挖过程,获得边坡的稳定性及其可能的破坏模式。结果表明,初步设计的露天矿边坡在采场的开挖过程中,会发生少量局部破坏,破坏模式主要是开挖面造成的拉裂破断和滑移破坏。之后,利用数值模拟方法,分析露天矿边坡逐步开挖后,边坡岩体的变形以及稳定性。计算结果显示,水平方向的切应力和位移主要集中在边坡坡面,开挖过程对应力、位移的分布和大小影响不大,与底摩擦试验结果相同。根据强度折减法可知,边坡的安全系数为1.25,满足设计规范要求,表明初设计的露天矿边坡是稳定的。     

紫木凼金矿露天坑底氧化矿回采及空区处理实践

紫木凼金矿露天开采已结束，边坡已并段，而边坡围岩倾角、倾向与边坡的倾角、倾向基本一致。因此，露天坑底氧化矿开采时，容易因为采动的影响而在露天边坡造成滚石，甚至滑坡。文中论述了露天坑底氧化矿回采及空区处理技术，该技术提高了作业效率、保证了生产安全、增强了开采的经济合理性。     

攀钢营盘山高陡边坡稳定性极限平衡综合评价

针对营盘山高陡边坡工程地质条件实际，根据控制边坡稳定性的不同边界条件，采用极限平衡法，从平面、空间角度对边坡稳定性进行了定量计算，并综合分析、评价了优化后的边坡境界方案。     

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)     

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.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.