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Prediction Research of Deformation Modulus of Weak Rock Zone under In-situ Conditions

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Journal of Mountain Science 2011年第2期8卷 345-353页

作者： ZHANG Yong HE JiangDa WEI Yufeng NIE Dexin School of Hydraulic and Hydroelectric Engineering Sichuan University Chengdu 610065China state key laboratory of {3. prevention and geoenvironment protection Chengdu University of Technology Chengdu 610059China

Weak rock zone (soft interlayer, fault zone and soft rock) is the highlight of large-scale geological engineering research. It is an important boundary for analysis of rock mass stability. Weak rock zone has been formed in a long geological period, and in this period, various rocks have undergone long-term consolidation of geostatic stress and tectonic stress; therefore, under in-situ conditions, their density and modulus of deformation are relatively high. Due to its fragmentary nature, once being exposed to the earth's surface, the structure of weak rock zone will soon be loosened, its density will be reduced, and its modulus of deformation will also be reduced significantly. Generally, weak rock zone can be found in large construction projects, especially in the dam foundation rocks of hydropower stations. These rocks cannot be eliminated completely by excavation. Furthermore, all tests nowadays are carried out after the exposure of weak rock zone, modulus of deformation under in-situ conditions cannot be revealed. In this paper, a test method explored by the authors has been introduced. This method is a whole multilayered medium deformation method. It is unnecessary to eliminate the relatively complete rocks covering on weak rock zone. A theoretical formula to obtain the modulus of deformation in various mediums has also been introduced. On-site comparative trials and indoor deformation modulus tests under equivalent density conditions have been carried out. We adopted several methods for the prediction researches of the deformation modulus of weak rock zone under in-situ conditions, and revealed a fact that under in-situ conditions, the deformation modulus of weak rock zone are several times higher than the test results obtained after the exposure. In a perspective of geological engineering, the research findings have fundamentally changed peoples' concepts on the deformation modulus of weak rock zone, provided important theories and methods for precise definit

关键词： Weak rock zone In-situ conditions: Stress Confining pressure Deformation modulus Multilayered

Formation,distribution and risk control of landslides in china

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Journal of Rock Mechanics and Geotechnical Engineering 2011年第2期3卷 97-116页

作者： Runqiu Huang, Weile Li state key laboratory of {3.s prevention and geoenvironment protection, chengdu university of technology, chengdu, 610059, china state key laboratory of {3.s prevention and geoenvironment protection chengdu university of technology chengdu 610059 china

china is a country with a large population as well as frequent landslides. The formation and distribution of landslides in china are determined by its special topography, complex geological environment, active earthquake environment and unusual climate features. This paper analyzes the main features and distribution of 200 catastrophic landslides that occurred in china since 1900. The relationships among the distribution of landslides and topographic conditions, geological structure, climate features and strong earthquake environment are analyzed. The features of landslide-triggering factors and critical conditions in different areas have also been considered. Based on the above-mentioned work, the authors have undertaken the studies of landslide susceptibility assessment. The study is performed according to the topographic and geological features, which are the main triggering factors that affect the landslides. The china’s mainland can be divided into 12 zones, including 4 high susceptibility zones, 7 medium susceptibility zones and 1 low susceptibility zone, according to landslide proneness. Considering the number of life loss and extent of property loss caused by landslides in those 12 zones, the risk evaluation results are listed as follows: 2 extremely high-risk zones, 5 high-risk zones, 2 medium-risk zones and 3.low-risk zones. Taking the number of life loss caused by landslides as the standard of risk level, the paper also analyzes the change in landslide risk level and main risk control measures in china since 1990s. Based on the risk level of landslides in other countries or regions, the acceptable landslide risk level in china has been proposed.

关键词： landslides risk control distribution of landslides in china's Mainland

Dynamic Design and Construction of Highway Cut Slopes in Huangshan Area, china

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Journal of Mountain Science 2011年第2期8卷 154-165页

作者： JU Nengpan ZHAO Jianjun HUANG Runqiu DUAN Haipeng state key laboratory of {3. prevention and geoenvironment protection Chengdu University of Technology Chengdu 610059 China Anhui Provincial Communication-Investment Group Co. Ltd. Hefe 230088China

Deformation and failure of high slope impact the construction and operation safety of highway in the mountainous areas. The deformation and failure are mainly caused by poor design which normally has not well combined with the geological conditions and unplanned construction. Therefore, effective design and construction management should be conducted for ensuring a successful construction without damage and risk. In light of the reality of high slope construction along highway in the Huangshan area, this paper proposes a technical procedure for dynamic design and construction management of high slopes along highway in the mountainous area. The proposed construction management scheme is divided into three phases, i.e., 1) design phase, 2) preparation phase of excavation, and 3. construction phase. During the design phase, experiences and lessons learnt from the design and construction of other high slopes along highway in the same region are summarized. The number of slopes and slope height should be optimized from the aspects of route selection and route form. During the preparation phase of excavation, "Excavation Permit Management System" should be adopted, and construction scheme should be made by the construction unit, then the scientific research and design unit determine whether it guarantees slope stability and makes optimization measures. During the construction phase, the scientific research unit would make proposal of optimization design, and apply the achievements of scientific research into practice through common efforts of various units based on the understanding of excavation and investigation. The management system mentioned above is adopted to conduct dynamic design and construction management for more than 90 slopes along the Huangshan - Taling - Taolin Expressway, and successful results of application have been achieved.

关键词： Highway cut slopes Dynamic design and construction Excavation Permit Management System Slope stability

Decision System for Geological Disaster Using Artificial Neural Network and GIS

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Decision System for Geological Disaster Using Artificial Neu...

2011 4th IEEE International Conference on Computer Science and Information technology(ICCSIT 2011)

作者： Baiyan Su and Qiang Xu state key laboratory of {3. prevention and geoenvironment protection chengdu university of technology chengdu 610059 china

Geological hazards are very harmful for human life. To measure the hazards and made correct decisions,this paper designs a decision system based on artificial neural network and Geographic Information System（GIS）.To improve the performance of the neural network,a novel differential evolution algorithm is used to train the connecting weights. The system makes full use of the functions of GIS and neural network,and is capable of visualization evaluation for the hazards.

关键词： geological disaster artificial neural network GIS decision system

The Genetic Mechanism of Wenchuan Earthquake

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Journal of Mountain Science 2011年第2期8卷 336-344页

作者： WANG Yunsheng HUANG Runqiu LUO Yonghong XU Hongbiao state key Lab. of geohazard {3. Chengdu University of Technology Chengdu 610059 China

The genetic mechanism of the 5.12 Wenchuan Earthquake is still being debated and there is still no convincing general explanation for most of the phenomena. This is because researchers have ignored the important role of the Minshan block in the seismogenic process. The authors present a new opinion based on geological survey and comprehensive analyses. The Minshan block is a key tectonic element of the earthquake occurrence in the northwest triangle faulty block of Sichuan Province. The Minshan block is bordered by Longmen Mountain Range fractures in the south, the Huya fracture in the east, the Tazang fracture in the north and the Mounigou Valley fracture in the west. The rigidity of the block is relatively larger than those of the adjacent regions. The block's eastward movement pushed by regional maximum main geo-stress is limited when it suddenly tapers off near the east triangle end with a bottle-neck effect, and this causes geo-stress concentration around it. The shape of the block is coffin-like, wide in the upper part and narrow in the lower part. When a strong earthquake occurs along the block margins, the lock-up effect temporarily released, resulting in geo-stress transmitted to the Pingwu-Qingchuan (Motianling block) region. This transmission caused the Wenchuan earthquake's aftershocks to be concentrated in Qingchuan region. As the block moved eastward, the back of the block, i.e. the south segment of Mounigou Valley fracture, became active after the Wenchuan Earthquake. Therefore the aftershocks were concentrated along the south segment of Mounigou Valley fracture. Because the south margin is composed of the front range fracture, the geo-stress gradually released, causing many aftershocks along the Guanxian-Anxian fracture. The geological survey made after the Wenchuan Earthquake reveals that the surface ruptures in the south margin of Minshan block occur not along the Beichuan-Yingxiu fracture (central fracture) also along the front range fracture. The

关键词： 5.12 Wenchuan Earthquake Genetic mechanism Minshan block Geological activities Longmen Mountain Range

Characteristic Analysis of Hydrogeololgy-Related Information Based on Remote Sensing——Taking Tibetan Naqu Area For Example

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Characteristic Analysis of Hydrogeololgy-Related Information...

2010 Second IITA International Conference on Geoscience and Remote Sensing (IITA-GRS 2010)

作者： DENG Hui LIU Hanhu state key laboratory of {3. prevention and geoenvironment protection chengdu university of technology chengdu Sichuan china

Owing to those unfavorable factors such as poor natural conditions,high altitude and vast territorial spread in Tibet,it is hard to locate water-rich areas accurately just with traditional hydrogeological survey methods,but remote sensing can do *** processed remote sensing Landsat TM/ETM imagery,this paper extracts geomorphology and geology information related to hydrogeology,discusses hydrogeological resources information of Quaternary Period and basement area,and finally analyzes primary water area,taking two areas in Tibet for *** research is expected to indicate direction for further hydrogeological investigation in Tibetan area,and to provide feasible means for hydrogeological investigation in other places.

关键词： Remote sensing Tibet TM/ETM Hydrogeology

Application on monitoring of Three Gorges Reservoir Collapse by High-precision Satellite Remote Sensing Technique

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Application on monitoring of Three Gorges Reservoir Collapse...

2010 Second IITA International Conference on Geoscience and Remote Sensing (IITA-GRS 2010)

作者： DENG Hui CAO Jingfeng state key laboratory of {3. prevention and geoenvironment protection chengdu university of technology chengdu Sichuan china

Using remote sensing techniques to monitor changes of coastline or regional geological disasters have achieved good results,but it is was less used in the monitoring of reservoir *** article introduces the application that using multi-temporal Quickbird satellite images and original topographic map to monitor the bank collapse of Three Gorge reservoir,and analyzes its research methods and implementation *** Shows the feasibility of using high-precision remote sensing technology to monitor reservoir bank collapse by a concrete example.

关键词： three Gorge satellite remote sensing technique bank collapse

AN ANALYSIS OF THE CO-SEISMIC FAULT EFFECTS OF THE GEO-HAZARDS TRIGGERED BY WENCHUAN EARTHQUAKE,china Paper No.3.8

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AN ANALYSIS OF THE CO-SEISMIC FAULT EFFECTS OF THE GEO-HAZAR...

ISRM-Sponsored International Symposium on Rock Mechanics:"Rock Characterisation,Modelling and Engineering Design Methods"(SINOROCK2009)

作者： Huang Runqiu state key laboratory of Geo-hazard {3. and geoenvironment protection, chengdu university of technology chengdu,china Li Weile state key laboratory of Geo-hazard {3. and geoenvironment protection, chengdu university of technology chengdu,china

"5.12"Wenchuan Earthquake(Ms=8.0) triggered tens of thousands of geo-hazards throughout an area of about 100,000 *** distribution of geo-hazards is definitely affected by the such factors as geomorphology,topography,lithology and human engineering activities,but the distribution of earthquake-triggered geo-hazards is mainly controlled by the co-seismic fault, for they present zonal distribution along the co-seismic *** the studies of three geo-hazard concentration areas including Doujiangyan to Wenchuan Road,Beichuan to Anxian County area,and Magong to Hongguang area,it is found that Wenchuan Earthquake-triggered geo-hazards have the following co-seismic effects:(1) Wenchuan Earthquake is a thrust fault *** distribution of geo-hazards show marked"hanging wall and footwall effects",manifested by that the distribution concentration in the hanging wall of seismic fault is higher than that in the footwall and the former coverage is wider than the latter as well as that the scale of geo-hazards is larger than that in the footwall;(2) the strong development zones of geo-hazards are within the range of 7 km in the hanging wall of co-seismic *** ranges of 7 to 1 lkm in the hanging wall and o to 5km in the footwall can be delimited as the middle development zones.A vast majority of large-scale landslides are distributed within the range of 5km from the fault,and large-scale landslides are unlikely to occur within the range of over 10km;(3. the transitional and staggered positions of fault are the concentration areas of geo-hazards and large-scale geo-hazards are likely to occur in these positions;(4) the preferred direction of landslide is NW-SE,basically vertical to the spreading direction of Yingxiu-Beichuan *** may be because that Longmenshan Fault Zone has always been affected by the tectonic stress field of NW-SE extrusion area since Cenozoic Time;(5) the earthquake-triggered geo-hazards mainly occur in the zones of seismic intensit

关键词： "5.12"Wenchuan earthquake co-seismic fault effects hanging-wall effect

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稀性泥石流容重计算的改进方法

山地学报 2009年第1期27卷 70-75页

作者：余斌成都理工大学地质灾害防治与地质环境保护国家重点实验室

稀性泥石流的沉积样的粒度不能反映稀性泥石流的实际粒度,过渡(亚粘性)泥石流的沉积样的粒度也不能完全反映亚粘性泥石流的实际粒度。通过分析稀性泥石流和亚粘性泥石流沉积样中的粗颗粒和细颗粒组成的百分比与稀性泥石流和亚粘性泥石... 详细信息

稀性泥石流的沉积样的粒度不能反映稀性泥石流的实际粒度,过渡(亚粘性)泥石流的沉积样的粒度也不能完全反映亚粘性泥石流的实际粒度。通过分析稀性泥石流和亚粘性泥石流沉积样中的粗颗粒和细颗粒组成的百分比与稀性泥石流和亚粘性泥石流的实际粒度分布关系,得出稀性泥石流以细颗粒为主,>5mm的粗颗粒的百分比较小,大多数稀性泥石流的沉积样中这部分粗颗粒百分含量被夸大。去掉稀性泥石流沉积样中>5mm的粗颗粒可以修正被夸大的粗颗粒比例,由此粒度分布和修正公式计算的稀性泥石流容重与实际容重吻合较好。去掉亚粘性泥石流沉积样中>20mm的粗颗粒,可以修正亚粘性泥石流的粒度分布,由此粒度分布计算的亚粘性泥石流容重与实际容重吻合更好。

关键词：稀性泥石流改进容重粒度分布百分含量