Impact model between boulder and pier was built based on the Hertz contact theory and structural mechanics. Three main influence factors of impact force, including the material properties, relative size, and structure displacement were quantized and the modified formula was presented to calculate impact force. It shows that, material correction coefficient ranges from 0. 20 to 0. 45, which is proportional to material yield strength Y while correlated reciprocally with the equivalent modulus of system, E. The correction coefficient of ball diameter ratio exhibits that, along with the increase of structure size, it increases stably after rapid growth. Structure displacement correction coefficient is affected by the constraint condition of pier top and impact location. The practical application of this modifier formula in Dengjigou engineering result is only 6.7% of the calculated value by Hertz elastic collision theory, and according to the outcome that, relation curve between impact force and impact velocity is relatively flat, which performs in accordance with practical estimation.

When conventional GM(1,1)model is used to predict,The model can make full use of the limited data to reflect the development and change of the system with initial small amounts of data.For more backward monitoring,The prediction accu-racy of the model is weaker.And in practical application,we must consider the disturbance or the driving factor of the system, put every new data into the system in any time,establish a new GM(1,1)model to predict the deformation.Therefore,in view of the shortcomings of the conventional GM(1,1)model,this paper establish the grey metabolic GM(1,1)landslide prediction model,and use the model to predict the deformation of highway Bada.The results show that the gray metabolism GM (1 ,1 ) model has a higher precision and less prediction error,and has good engineering application value.

针对国内预应力锚索外锚头采用单一夹片式锚具锁定容易出现外锚锁定失效的问题,提出通过在原有夹片式锚具锁定的基础上增设附加锁固件的方式来强化锚头锁定力.附加锁固件由钢套筒和锚固胶两部分构成,通过高强锚固胶将锚具外露钢绞线端头与套筒固为一体,形成外锚头多重锁定效果,具有结构简单、受力明确、经济实用的特点.通过拉拔实验,对比分析附加锁固件张拉破坏时的受力特性,确定了附加锁固件的最优设计参数.试验证明了本方法的合理性和有效性,其结果可为新型预应力锚索锚头强化锁固技术的推广应用提供理论依据.

To make industrial robots and intelligent mobile platform available in the field of high-tech field which needs precise assemblage and operation,a high-precision stereo vision detection approach was proposed.Laser features were used in Harris corner detection,therefore feature detection was much more precise.The rude level detection was done by image pyramids struc-ture features based on direction vectors of images which got from two low resolution cameras together with line laser features from a high-speed laser scanning equipment.High-precision detection was achieved using both the displacement information of the laser and the image ROI (region of interest)features based on priori knowledge got from a high resolution monocular camera. Compared with the traditional method,the proposed method generates more accurate feature extraction result with less time con-sumption of the detection algorithm.

In inertial navigation system, some traditional calibration methods of accelerator mainly rely on turntable, other methods without the support of turntable have less accuracy. Therefore, this paper presents a high-accuracy calibration method of accelerator without the support of turntable. It only needs 12 static output data of accelerator to calibrate the bias, scale factor and misalignment. Experiment results indicate that this method has higher accuracy cnmDared with traditional calibration method without the support of turntable.

In the data fusion of tightly coupled GPS/Attitude Heading Reference System (AHRS), the calculation errors of traditional UKF resulted in a negative definite state of covariance. The results may ultimately reduce the accuracy of filter and even cause divergence of filters which lead to abnormality of the system. An improved adaptive SRUKF (square root unsensitive Kalman filter) provided in this paper, can help solve the problem of negative definite state covariance and lower calculation complexity. The filtering results of the simulation data show that, under the condition of unknown and real-time system noise statistics, the improved adaptive SRUKF in a tightly coupled integrated navigation system have better performance both in accuracy and in robustness.

This paper focuses on the applications of extension theory in geological engineering. The characteristics of geological engineering are first discussed, and it is shown that the effect of different grades on the correlation degree is equivalent but interval lengths may be different; and correlation degree is linearly related with effect factor. With a special and simple geological engineering example, the extension matter-element theory is applied and then expanded, and related curves of all grades between correlation degrees and grades (effect factor values) are plotted. The problems are analyzed based on differences between curves and actual situations. A new correlation function is then proposed to improve the differences between the original function and actual situations. Finally, the improved function is shown in agreement with actual situations by analyzing its curves in geological engineering.

The study area in this paper,the reservoir area of a hydropower station located on the upstream of the Jinshajiang River,is characterized by high relief and inaccessibility.ETM+ and SPOT-5 Pan are used as the remote sensing data source.However,the spatial resolution of SPOT-5 Pan is much higher than that of ETM+ multi-spectral images,and therefore,a suitable fusing method should be selected to fuse SPOT-5 Pan with ETM+ images to obtain a fused image with high spatial and spectral resolutions.In this paper,a comparison has been made between various fusing methods,including IHS,Brovey and PCA transformation methods.Subjective appraisal and horizontal spectral profile have been adopted to assess the quality of the fused images.Also field survey has been taken to find the interpretation veracity.

ETM+与SPOT-5Pan融合影像含有丰富的光谱信息和空间结构信息,是地质灾害调查的理想数据源。但ETM+多光谱图像与SPOT-5 Pan图像空间分辨率相差悬殊,直接融合可能导致融合影像色彩模糊、色调不和谐等问题;若将ETM+与其全色融合后再与SPOT-5 Pan融合,如果融合方法不当亦会造成光谱信息的过多损失。通过采用IHS、Brovey、PCA和Gram-Schmidt变换分别对ETM+和SPOT-5 Pan按上述两种途径进行直接和间接融合,采用主观评定以及光谱剖面分析对融合影像进行了评价,从而筛选出适合于地质灾害调查的ETM+与SPOT-5 Pan融合方法。

文章讨论了外场移动条件下多径信道的一种测试方法,并通过搭建的系统对市区环境微小区的信道分布情况进行测试。实测结果表明基于该方法搭建的测试系统能够有效地测试外场多径信道的分布情况。且该方法抗干扰性强,具有低功耗、存储数据量少、运算复杂度低、精度高、实时性强的优点。

How to predict and forecast the landslide hazard effectively is always a key point for prevention from casualty and economic loss caused by landslides. Based on the coupling analysis of the geology and meteorology,it is possible to improve the precision of the landslide forecast. The occurrence of landslides is mainly controlled by the following three factors:topography,geology and rainfall. A new method of landslide probabilistic forecast is proposed considering the combination of geologic environment with weather conditions. The urban area of Chongqing,which is one of the cities with most serious landslides in China,is taken as the study example. Taking into account the geologic environmental factors such as slope gradient,slope shape,lithology combination,structures of rock mass and hydrologic geology,the landslide susceptibility zonation is conducted with the information model. The prediction criterion of landslides in each susceptibility subarea is established by two variable combinations:the maximum 24 hours rainfall and the antecedent effective precipitation of 15 days. Finally,the feasibility of the probabilistic forecast on landslides using weather prediction is discussed with an actual example.

The Three Gorges Reservoir area is located at the upper reaches of the Yangtze River,where the geological hazards occur with high frequency,especially the major landslides are fully developed at the bank slopes along the river.These landslides are characterized by great amount,extensive distribution and big magnitude,often causing serious loss and casualty in local areas.How to predict landslides is the key to prevent hazards and reduce economical loss and casualties.The rainfall is the dominant exterior factor triggering the landslides.Based on statistic analysis of the data of 112 landslides(volume≥104 m3),the relationship between landslide and rainfall is derived.It is suggested that the temporal prediction criterion of landslides in the local areabe established by the maximum 24-hour rainfall.In terms of the characteristics of landform,lithology,geologicalstructures etc.,the Three Gorges Reservoir area is divided into two parts for landslides prediction.Using themaximum 24-hour rainfall in 72 hours as the prediction index,the occurrence probabilities of landslides aredetermined in different rainfall conditions for the two subareas.The distinct difference of landslides probabilitiesbetween the two subareas indicates that their different mechanism of rainfall induced landslides.Based on thecoupling analysis of the geology and meteorology,it is possible to improve the precision of the landslideforecast.

As one of the top ten natural disasters, landslides have great impacts on the environment and on societies, and often cause vast economic losses and casualties. Many methods have been developed for the prediction or forecast of landslides; however, results are not very satisfactory. Two kinds of triggering factors are currently considered in prediction or forecast of landslides: natural and man-made. Under given geological and geomorphic conditions, rainfall becomes a key natural factor. Based on philosophical thoughts on the prediction or forecast of landslides, the authors suggest that the method of ”weather-slope” forecast, in which probability of occurrence of landslides was calculated based on the forecast of rainfall, be enhanced,. As expected, by integrating the ”weather slope” forecast with the monitoring of landslides, the resulting method could improve the accuracy of prediction or forecast of landslides.