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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： L.Q,Zhang~*,J.Zhou,X.L.Wang key laboratory of engineering geomechanics,institute of {2. and {3.,chinese academy of sciences,Beijing 100029,PR china

*** Discontinuities,such as joints,fissures,faults and bedding planes, play extremely important roles in mechanical behaviors of rock masses. Many researchers have been interested in deformation and failure of intermittent joints,with a particular attention paid to strength weakening of intact segments along discontinuities,referred to as

关键词： Intermittent joint Rock bridge Maximum tensile stress Critical stress analysis Long-term tensile strength

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Diminished groundwater recharge and circulation relative to degrading riparian vegetation in the middle Tarim River,Xinjiang Uygur,Western china

Diminished groundwater recharge and circulation relative to ...

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中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： Zhonghe Pang,~(1*) Tianming Huang~(1,2.and Yaning Chen~3.1 key laboratory of engineering geomechanics,institute of {2. and geophysics,chinese academy of sciences,Beijing,100029,china 2.Graduate University of chinese academy of sciences,Beijing,10003.,china 3.{13. {12. of Oasis Ecology and Desert Environment,Xinjiang institute of Ecology and Geography,chinese academy of sciences,Urumqi, Xinjiang,83.011,china

Riparian vegetation in the middle Tarim River is being degenerated,and groundwater in the riparian system is a key facto controlling this *** degeneration is related to the reduced inflow from the upstream,reduced recharge to riparian groundwater,lowered water table and increased salinity of the groundwater *** chemical and isotopi sampling of river water and groundwater transects perpendicular to the river show that riparian groundwater is fed by the *** water picks up salts from the river bed and/or from irrigation returns as it flows downstream,and groundwate from riverbank sediments mirror this *** dissolution and evapotranspiration are the main mechanisms of salt accumulation in *** recharge from the river has resulted in a distinctive zoning pattern in groundwate *** residence times derived from tritium contents indicate that the extent of modern recharge(since the 1960s)is limited to approximately 1500 m from the riverbank in the middle reaches of the Tarim *** grows better in habitats with modern groundwater than in other *** embankment built in 2.01 along one side of the Tarim River appears to have reduced groundwater recharge,causing the water table to drop and ecosystem to *** (?)2.09 John Wiley & Sons,Ltd.

关键词： riparian vegetation groundwater recharge isotopes Tarim River eco-hydrology salinity

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Analysis of Ground Fissures Induced by Underground Mining in a Metal Mine

Analysis of Ground Fissures Induced by Underground Mining in...

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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： Haijun Zhao~a,Fengshan Ma~b,Jie Guo~c 1key laboratory of {2. {3.,institute of geology and geophysics,china academy of sciences,Beijing 100029,china

Jinchuan nickel mine is the largest cut-and fill mining mine in *** keep successive mining for nearly twenty years,it appeared serious ground fissures.A major thrust of this paper is to discuss the distribution features,deformation regularities,development tendency and formation mechanisms of ground fissures based on long-term subsidence monitoring and *** results showed that large-scale ground subsidence basin has been developed in the mine area,and the ground fissures mainly scattered in the tensile zone of the subsidence ***,ground fissures have the features of compressive shear or tensile mechanical properties and zonary pattern. Unfortunately,with the mining scale keep expanding,both the quantity and width of the ground fissures increased *** will be unfavourable to safety of mining and engineering facilities. Therefore,strengthened monitoring and prevention works are essentially important to the similar mines which designed with cut-and-fill mining method.

关键词： underground mining metal mine subsidence ground fissure monitoring

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Palaeoenvironmental implication of the Plio-Pleistocene loess deposits in southern Tarim Basin

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chinese Science Bulletin 2002年第8期47卷 700-704页

作者： ZHENG Hongbo, CHEN Huizhong & CAO Junjilaboratory of Marine geology, Tongji University, Shanghai 2.0092.{2. institute of Earth Environment, chinese academy of sciences, Xi’an 710054,{2. institute of Environment and engineering of Cold and Arid Regio laboratory of Marine geology Tongji University Shanghai 200092 China

The sedimentary characteristics, grain-size distribution, geochemical composition and surface characteristics of quartz grains, together with palaeoenvironmental reconnaissance, all point to an aeolian origin for the intercalated siltstone beds in the Plio-Pleistocene Artux and Xiyu Formations along the southern margins of the Tarim Basin, indicating that loess deposition in the region started, at least, in the Early Pliocene. Loess deposition in the southern Tarim Basin was a response to the global deterioration, which might be attributed to the uplift of the Tibetan Plateau.

关键词： eolian loess Plio-Pleistocene Tarim Basin.

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Water geochemistry of the Chaohu Lake Basin rivers,china:Chemical weathering and anthropogenic inputs

Water geochemistry of the Chaohu Lake Basin rivers,China:Che...

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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： Zhifang Xu~(a,*),Jianpeng Ji~(a,b),Chao Shi~(a,b) a key laboratory of engineering geomechanics,institute of {2. and {3.,chinese academy of sciences,Beijing 100029,china b Graduate University of chinese academy of sciences,Beijing 100049,china

As one of the five largest freshwater lakes in china,the Chaohu Lake is polluted by many kinds of pollutants. Chemical and Sr tsotopic compositions of river waters in the Zhegao River sub-catchment have been determined with the main purpose of understanding the contribution of chemical weathering and anthropogenic inputs to *** major ion compositions of the river waters are characterized by the dominance of Ca and HCO,followed by Mg and *** chemical and Sr isotopic analyses indicate that three major reservoirs(carbonate,silicate and human activities) contribute to the dissolved *** calculated results show that the dissolved load is dominated by carbonate *** contribution of the anthropogenic inputs is estimated to be from 1.64%to 3..8%,with an average of 15.6%, demonstrating the strong impacts of human activities on water *** total chemical denudation flux of the Zhegao sub-catchment is about 12..7 ton km a with carbonate and silicate weathering rates of 97.5 ton km a and 3..2.ton km a,respectively.

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The Characteristics and Causes of Land Subsidence in Tanggu Based on the GPS Survey System and Numerical Simulation

The Characteristics and Causes of Land Subsidence in Tanggu ...

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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： MA Fengshan~1,WEI Aihua~(1*),HAN Zhantao~2.ZHAO Haijun~1 and GUO Jie~1 1 key laboratory of engineering geomechanics,institute of {2. and geophysics,chinese academy of sciences,Beijing 100029,china 2.The institute of Hydro{2. and Environmental {2.,chinese academy of Geological sciences, Shijiazhuang 050061,china

Land subsidence is a severe hazard threatening Tanggu,a flat lowland area,and evidences of land subsidence can be seen throughout the city.A new reasonable GPS network was set up in this area from 2.08 to *** monitoring data show that land subsidence was serious and two main subsidence cones were obviously formed In the *** emerged at Hujiayuan,with the maximum rate reaching 60 mm/a,and the influence region enlarged prominently from 2.05 to *** other one occurred at Kaifaqu,which became obvious only after 2.05,and it showed a decreasing tendency with *** analyze the causes of ground settlement,a correlation between groundwater withdrawal and land subsidence was firstly *** results confirmed that over-exploitation of groundwater was the major cause for the severe settlement In ***,the subsidence of Kaifaqu was also related to groundwater withdrawal before ***,the relationship became unconspicuous after *** find the cause of this abnormity,a three-dimensional finite element numerical model,coupled with groundwater flow and subsidence,was *** simulation results indicate that the subsidence Induced by high-rise buildings is serious,but the affected range is limited and it also shows a decreasing trend with time,corresponding to the subsidence characteristics at ***,more attention should be paid to this hazard induced by {3. construction besides groundwater withdrawal,as more high-rise buildings are under construction in Tanggu.

关键词： land subsidence GPS subsidence cones finite element numerical model high-rise buildings

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Physical modelling of joint effects on deformation and failure of tunnels

Physical modelling of joint effects on deformation and failu...

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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： Haijun Zhao~(1,a),Fengshan Ma~(1,b) and Jie Guo~(1,c) 1 key laboratory of engineering geomechanics,institute of {2. and {3.,china academy of sciences,Beijing 100029,china

The deformation and failure mechanisms of tunnels in jointed rock mass with variable orientation and overburden pressures were studied by physical *** deformation and expansion characteristics and regularities of joints and its influence on the stability of tunnels were *** results shown that the effects of unloading and reactivation of joints,and subsequent shear slip and deformation induced by excavation cause the structural instability of *** deformation,failure,and instability of surrounding rocks are essentially the continued deformation and repeated failure of joints in varied stress field caused by excavation and overburden pressure. When the dip angle of the joint sets is 75°,the joints have extremely striking influence on the stability of *** addition,with the increasing of the overburden pressures,the deformation extent and failure rate are sped up prominently due to the rapid increasing of the shear stresses on joint planes.

关键词： joint tunnel deformation stability of surrounding rocks physical modelling

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Chemical and Strontium Isotopic Compositions of the Hanjiang Basin Rivers in china:Anthropogenic Impacts and Chemical Weathering

Chemical and Strontium Isotopic Compositions of the Hanjiang...

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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： Zhifang Xu Chao Shi Yang Tang Hongyin Han key laboratory of engineering geomechanics,institute of {2. and {3., chinese academy of sciences,100029 Beijing,china Graduate University of chinese academy of sciences,100049 Beijing,china institute of Geochemistry,chinese academy of {12.,550002.Guiyang,Guizhou,china key laboratory of Biologic {2. and Environmental {2. under Ministry of Education, china University of Geo{12.,43.074 Wuhan,china

The Hanjiang River,the largest tributaries of the Changjiang(Yangtze) River, is the water source area of the Middle Route of china’s South-to-North Water Transfer *** chemical and strontium isotopic compositions of the river waters are determined with the main purpose of understanding the contribution of chemical weathering processes and anthropogenic inputs on river solutes,as well as the associated CO consumption in the carbonate-dominated *** major ion compositions of the Hanjiang River waters are characterized by the dominance of Ca and HCO,followed by Mg and *** increase in TDS and major anions(Cl,NO,and SO) concentrations from upstream to downstream is ascribed to both extensive influences from agriculture and domestic activities over the Hanjiang *** chemical and Sr isotopic analyses indicate that three major weathering sources(dolomite,limestone,and silicates) contribute to the total dissolved *** contributions of the different end-members to the dissolved load are calculated with the mass balance *** calculated results show that the dissolved load is dominated by carbonates weathering,the contribution of which accounts for about 79.4%for the Hanjiang *** silicate weathering and anthropogenic contributions are approximately 12.3.and 6.87%,*** total TDS fluxes from chemical weathering calculated for the water source area(the upper Hanjiang basin) and the whole Hanjiang basin are approximately 3.8×10 and 6.1×10 ton/year,respectively. The total chemical weathering(carbonate and silicate) rate for the Hanjiang basin is approximately 3..5 ton/km/year or 18.6 mm/k year,which is higher than global mean *** fluxes of CO consumption by carbonate and silicate weathering are estimated to be 56.4×10 and 12.9×10 mol/year,respectively.

关键词： Hanjiang River South-to-North water transfer project Sr isotopic ratio Chemical weathering CO2.consumption

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The Cultural Relics Distribution Characteristics Along the Canal Line and Appraisal of its Influence by the Middle Route Project for Water Transferring from South to North china

The Cultural Relics Distribution Characteristics Along the C...

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中国科学院地质与地球物理研究所2.03.术年会

作者： Yanjun Shang,~* Sijing Wang,Zhifa Yang,Kunshu Zhou,and Lihui Li key laboratory of engineering geomechanics,institute of {2. and {3.,chinese academy of sciences,Beijing 100029,Peoples Republic of china

Assessments of the impacts of environmental hazards on ecological systems and human health have become a subject of ever-increasing *** this work, we extend current ecological hazard evaluation to the problem of protecting cultural relics from hazards attributable to the presence of a large-scale canal system being planned in *** development and utilization of water resources must be closely combined with the preservation of cultural *** Middle Route Project for Water Transfer from South to North china(MRWT) is a current *** this paper,the engineering background of this project is briefly introduced. The distribution of cultural relics related to it is also summarized in terms of different geographical *** influence index E = f(L.Δh,k,I,v,s) is introduced to measure the comprehensive effect of the canal on cultural relics. Because this function is really established at the preconstruction stage,it is treated by use of fuzzy *** cultural relic has its own E *** relics with E values greater than 0.75 should be paid high attention,while those with E less than 0.5 may generally be *** must be preserved through use of engineering measures are cultural relics with E values greater than *** to those cultural relics with E ranging between 0.5 and 0.75,whether they should be preserved with engineering controls depends upon practical circumstances specific to each relic.

关键词： Middle Route Project for Water Transfer from South to North china cultural relics influence index fuzzy mathematics.

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Selection of emergency shelter sites for seismic disasters in mountainous regions:Lessons from the 2.08 Wenchuan Ms 8.0 Earthquake,china

Selection of emergency shelter sites for seismic disasters i...

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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： Qiang Liu~(a,b,*),Xuejing Ruan~b,Pilong Shi~a a key laboratory of engineering geomechanics,institute of {2. and {3.,chinese academy of sciences,Beijing 100029,china b Ocean University of china,Qingdao 2.6100,china

In this paper,we use the 12.May 2.08 Wenchuan Earthquake as a background event for analyzing and applying the principles of site selection of emergency shelters for a disastrous *** on field investigations and analyses of remote sensing imagery,we identified the distribution of active faults and the locations of co-seismic surface rupture zones—areas in which buildings are at risk of intensive damage. It is important that emergency shelters are located outside of such vulnerable *** of the lessons learned from the Wenchuan Earthquake is that high fatality rates occur in areas without life-saving *** principles that underlie the selection of emergency shelter sites are as follows;(1) keep far away from active fault zones,with the distance depending on the characteristics of the fault,including the nature of hangingwall and footwall structures;(2. disaster-mitigation strategies should be developed as a multi-dimensional system for the management of natural hazards,human activities,and urban expansion,involving keeping away from vulnerable slopes and establishing an early-warning system;(3. the accessibility of mountainous regions must be considered,including establishing small emergency shelters that house large numbers of people and covering regions with an uneven distribution of villages;and(4) government and law-making agencies in{3. must establish new earthquake design codes for buildings,emphasizing the importance of public facilities(including schools,collective welfare institutions, and medical facilities) as emergency shelters during disastrous *** site-selection process requires an interdisciplinary approach involving seismologists,engineers,environmental and social scientists,emergency management personnel,and government *** parameters upon which the above principles are based can be qualitatively determined,thereby providing a valuable initial database for further quantitative *** preliminary res

关键词： Emergency shelter Earthquake hazard Disaster mitigation Site-selection principles Risk management

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