打桩施工对附近高压铁塔形变的影响

近距离内预制桩打桩施工对高压铁塔的形变影响实例甚少,本文仅就普陀区俞赵宅工地的监测成果,提出塔基升降、水平位移、铁塔倾斜等允许值,可供今后同类工程施工时参考。

地壳形变对航天测控站站址坐标影响的分析

航天测控站分布在全球不同的板块,其站址坐标随地壳形变而发生变化。分析了中国大陆区域的地壳形变运动速率,讨论了地壳形变对航天测控站站址坐标的影响,提出了改正措施。

荷载对形变观测影响的定量计算

近年来,荷载干扰对地形变观测的影响日趋严重。以2014—2015年福建省漳州市寺庙施工对洞体应变的影响为例,利用ANSYS软件,定量地模拟计算了寺庙施工对该地形变测项的影响量值。结果表明,漳州洞体应变东西分量数据曲线畸变与寺庙施工有关,不是地震前兆异常。

钙镁膨胀剂在隧道衬砌防开裂治理上的应用研究

在寒冷地区或者在温差较大的线路区域,公路隧道养护经常要应对衬砌温缩开裂的防护治理问题。在衬砌混凝土中掺加钙镁膨胀剂技术,是受水工混凝土温缩防裂技术启发,而在公路隧道工程中逐渐探索应用的一项公路隧道衬砌防开裂技术。案例隧道工程应用该工艺开展隧道衬砌防开裂防护治理,取得了明显的防护治理效果。围绕该工艺技术,重点介绍了钙镁膨胀剂对衬砌混凝土自由形变、砂浆限制形变、加筋混凝土形变、混凝土温度应力等的功效影响,通过数据比较,验证了该工艺技术的工程适用性。

A Numerical Study on the Effects of Orography During the Landfall Process of Typhoon Haitang

The landfall process of typhoon Haitang which affected East China seriously was simulated by using the MM5 model and the track, intensity, precipitation and structure of typhoon were successfully reproduced. Then through the sensitive test, the effects of terrain were analyzed Results show that the irregular track during the period of typhoon passing through Taiwan and later landfalling at Fujian was in relation to the occurring and developing of orthographic impressed depression. The amount of rainfall was enhanced more than one time and the strength of typhoon was weakened 4 to 5 hPa. It is found that the effect of terrain on the structure of typhoon is limited at low level and is backward in space compared with the one at high level. In addition, the phenomenon that the equivalent temperature in the typhoon＇s moving direction inclines to the west on the eye of landfall may be concerned with the terrain.

几种外保温系统的比较分析

外墙外保温技术是在外墙外侧附加一种保温隔热层。外墙外保温有效地避免了室外温度对建筑物的形变影响使外墙体处于一个相对一致的温度环境．既保护了主体的围护结构．又延长了建筑物的使用寿命。目前在我国北方建筑施工中．外保温系统主要分为四大类：苯板保温系统、膨化珍珠岩保温系统、保温装饰一体化保温系统、聚氨酯夹芯板材系统。

路基拓宽防沉降技术的应用

路基拓宽是指对现有的公路进行扩展的一种施工方法，在对公路进行拓宽的实际过程之中，不可避免的会造成新旧公路之间的相互挤压，并且由于新旧公路性质的不相同，路基拓宽的实际过程之中就会出现很多的问题，进而就会影响到公路的正常运行和行人的安全。为了预防和有效地解决路基拓宽过程当中所出现的一系列问题，就有必要分析路基拓宽的理论和关键技术，并且要分析不同路基拓宽的方案对地基造成的形变影响。同时，路基拓宽对于促进我国的经济发展等具有非常深远的意义。

Effects of Geographic and Topographic Factors on First Frost in Shanxi Province from 1961 to 2010

Based on day-to-day minimal ground temperatures in 1961-2010 from 62 meteorological stations in Shanxi province,the variation characteristics of Shanxi＇s first frost were analyzed.The results show：Shanxi＇s average first frost date was October 7,and the first frost date of the north was generally earlier than the south; the average first frost date had obvious negative correlations with altitude and latitude,and the correlation coefficients were respectively-0.85 and-0.82.M-K mutation test shows that the first frost date of most meteorological stations had mutations from 1961 to 2010,mainly in the years from 1981 to 2000,and the mutation year of the central area was generally later than the north and the south; the mutation year had negative correlations with altitude and latitude,and the correlation coefficients were respectively-0.45 and-0.51.The first frost dates of most stations had a delaying trend.Specifically,the large delaying scope region was located in the north and the mid-east,and the large advancing scope region was located in the south and the south central.The changing trend had negative correlations with altitude and latitude,and the correlation coefficients were respectively-0.30 and-0.37.Probabilities of the mild,the moderate and the severe first frost were 62％-82％,6％-26％ and 4％-22％,respectively,and the maximum probabilities appeared in the south central ＆ northeast,the central ＆ north central and the west ＆ north central.Correlation of altitude with first frost tends to be volatile upon frost grade and latitude has bigger impacts on first frost probabilities.

Vertical Crustal Displacements Due to Surface Fluid Changes

Using the model data for surface mass changes of the atmosphere, ocean, soil moisture and snow depth, the vertical crustal displacements of 25 ficual stations in China were calculated according to the loading theory. From the spectral analysis of the results, we can see that the periods of displacements are 12 months and the semi-periods are 6 months. The results also show that the maximum seasonal displacements can reach 20 mm and even larger. The covariance analyses and significance tests show that the coefficients of 96 percent of the stations are significant at the 0.1 significance level. The results show that one of the reasons of the vertical crustal displacements is the changing surface fluid loads.

Sensitivity analysis of influencing parameters in cavern stability

In order to analyze the stability of the underground rock structures,knowing the sensitivity of geomechanical parameters is important.To investigate the priority of these geomechanical properties in the stability of cavern,a sensitivity analysis has been performed on a single cavern in various rock mass qualities according to RMR using Phase 2.The stability of cavern has been studied by investigating the side wall deformation.Results showed that most sensitive properties are coefficient of lateral stress and modulus of deformation.Also parameters of Hoek-Brown criterion and r c have no sensitivity when cavern is in a perfect elastic state.But in an elasto-plastic state,parameters of Hoek-Brown criterion and r c affect the deformability;such effect becomes more remarkable with increasing plastic area.Other parameters have different sensitivities concerning rock mass quality(RMR).Results have been used to propose the best set of parameters for study on prediction of sidewall displacement.

Humidification vibration deformation behavior of intact loess

A parameter, known as the parameter of humidification vibration deformation, was proposed, describing quantitatively the impact of water content on vibration settlement deformation, and its relationship with humidification water content, dynamic shear stress peak value, initial consolidation stress and vibration frequency was built. The result shows that 1） the parameter of humidification vibration deformation increases with the vibration shear stress peak value increasing. 2） The humidification water content has significant influence on the curve of the parameter of humidification vibration deformation and the peak vibration shear stress. When the humidification water content is low, the curve increases slowly. However, when the humidification water content is high, the curve increases rapidly. 3） Initial consolidation stress has significant influence on the humidification vibration deformation coefficient. When initial consolidation stress is not large enough to destroy the loess structure, with initial consolidation stress increasing, the humidification vibration deformation coefficient decreases. On the contrary, the humidification vibration deformation coefficient increases with initial consolidation stress increasing. 4） With the increase of vibration time, the parameter of humidification vibration settlement shows an increasing trend overall. The initial dynamic shear stress peak value and humidification water content all have significant effects on the curve of the parameter of humidification vibration settlement and vibration time. However, the humidification water content is even more significant.

Outcomes of palliative local treatment in metastatic colorectal cancer patients receiving chemotherapy plus bevacizumab

Objective The aim of this study was to assess the value of palliative local treatment of incurable metastatic lesions in colorectal cancer(CRC) patients receiving chemotherapy plus bevacizumab.Methods Data of 105 patients with histologically confirmed synchronous or metachronous metastatic CRC who received bevacizumab treatment from January 1, 2011 to January 31, 2017 were retrospectively reviewed. Sixteen(15%) patients who were treated with bevacizumab for less than 4 cycles were excluded, and finally, 89(85%) patients were enrolled. Among them, 33(37%) patients who received palliative local treatment were categorized into the palliative local treatment group, and the remaining 56(63%) patients were categorized into the chemotherapy plus bevacizumab group. The primary endpoint was overall survival(OS), which was calculated using Kaplan-Meier survival analyses. Factors possibly influencing survival were evaluated by univariate and multivariate analyses. Adverse events(AEs) were graded according to Common Terminology Criteria for Adverse Events, version 4.0. Grades 1–2 and 3–4 AEs of the two groups were compared and analyzed using the Fisher's exact test and χ~2 analysis.Results The median follow-up period was 20.4 months, ranging from 1 to 60 months. The median OS in the palliative local treatment group was 36.3 months(95% CI, 33.5–39.2), and that in the chemotherapy plus bevacizumab group was 20.5 months(95% CI, 17.6–23.4). Both the univariate(HR 0.13, 95% CI, 0.05–0.30, P < 0.001) and multivariate(HR 0.16, 95% CI, 0.07–0.39, P < 0.001) analyses showed that the addition of palliative local treatment could prolong survival compared with chemotherapy plus bevacizumab alone. There were no significant differences in the rates of common chemotherapy-or bevacizumab-related AEs between the two groups.Conclusion These findings suggest palliative local treatment is an effective and safe method for treating patients with incurable metastatic CRC receiving chemotherapy plus bevacizumab.

Effect of key factors on cold orbital forging of a spur bevel gear

Cold orbital forging is an advanced spur bevel gear forming technology. Generally, the spur bevel gear in the cold orbital forging process is formed by two steps: the preforming step and the final step. Due to the great importance of the final step to gear forming and its complication with interactive factors, this work aims at examining the influence of key factors on the final step in cold orbital forging of a spur bevel gear. Using the finite element(FE) method and control variate method, the influence rules of four key factors, rotation velocity of the upper tool, n, feeding velocity of the lower tool, v, tilted angle of the upper tool, γ, friction factor between the tools and the billet, m, on the geometry and the deformation inhomogeneity of the cold orbital forged gear are thoroughly clarified. The research results show that the flash becomes more homogeneous with increasing v, increasing m, decreasing n or decreasing γ. And the deformation of the gear becomes more homogeneous with increasing v, decreasing n or decreasing γ. Finally, a corresponding experiment is conducted, which verifies the accuracy of FE simulation conclusions.

Alpine Activity Patterns of Mitopus morio(Fabricius, 1779) are Induced by Variations in Temperature and Humidity at Different Scales in Central Norway

Our research addresses questions about how micro-climate affects activity abundance of a common and widespread harvestman in an alpine ecosystem. Activity patterns of the Harvestman Mitopus morio(Fabricius, 1779) were studied along different alpine gradients in the central Norwegian Scandes. Within a nested design, we surveyed 18 alpine habitats with pitfall traps and microclimatological equipment along oceanic-continental, two elevational, and(fine-scaled) microtopographic gradients. Sites in the oceanic region of the Scandes showed generally higher abundance of M. morio than sites in the continental region. Furthermore, along the elevational gradient, middle-alpine sites showed higher abundances than low-alpine sites. These general patterns are best explained by higher humidity in the oceanic region and in the middlealpine belt. Focusing at a finer scale, i.e. one elevational level within each region, revealed partly opposing activity patterns within relatively short distances. While in the western middle-alpine belt these patterns were best explained by humidityrelated measures but now with higher activity abundance during drier conditions, in the drier eastern middle-alpine belt heat sums rather than humidity were found to be the best explanatoryvariables for the observed patterns. Hence, our results imply a pronounced different reaction of the two populations towards climatic variables that partly even contradict the previously described general pattern. Regardless whether these differences in activity abundance in M. morio are a form of phenotypic plasticity or adaptation, our findings stress the importance of detailed autecological knowledge combined with fine-scaled climatic measurements when aiming at predictions about possible future ecosystem structures and spatiotemporal phenomena. M. morio proves to be an ideal biogeographic model organism for understanding spatio-temporal responses of alpine ecosystems under modified climatic conditions.

Subtidal variability in the Taiwan Strait induced by combined forcing of winter monsoon and topography

As an important channel connecting the East and South China Seas, circulations in the Taiwan Strait are strongly influenced by the East Asian monsoon and the topography of the strait, especially the Taiwan Bank(TWB), which is a remarkable topographic feature located at the southern entrance to the strait. Based on a series of pressure gauges deployed roughly 40 km offshore along the western Strait, subtidal sea-level variability under the combined impact of winter monsoon and topography was studied. The analyses show significant along-strait coherences of subtidal sea levels and their coherences with the large-scale monsoon wind for periods from 2 to 14 days. It is suggested that these fluctuations are mainly forced waves driven by the large-scale winds. In addition to the normal cross-shore wind setup, a sea-level setup in the along-strait direction is confirmed, which is induced by the combined forcing of the fluctuating winter monsoon and the blocking of the TWB. A southward current surge driven by a northerly wind event will cause a rising sea level over the TWB inducing a southward alongshore slope anomaly to the north of the TWB and a reversed slope anomaly to the south The subtidal current through the channel to the west of the TWB is found to be influenced by the reversed slope anomalies generated via the along-shore setup.