Tianjin Institute of Geological Survey

Tianjin, China

Tianjin Institute of Geological Survey

Tianjin, China
Time filter
Source Type

Lei H.-Y.,Tianjin University | Lu H.-B.,Tianjin University | Bai J.-W.,Tianjin Institute of Geological Survey
Geotechnical and Geological Engineering | Year: 2017

The deformation mechanism of engineered municipal construction waste (EMCW) is complicated and different from that of the traditional soil. A series of field tests and field measurements were performed on the piled mountain project to investigate the deformation characteristics of EMCW during the construction waste accumulation. Experimental studies revealed that EMCW was defined as a kind of heterogeneous soil with well-graded soil. The coefficients of uniformity were all greater than 10, while the coefficients of curvature were between 1 and 3. The permeability had approximately the same performance as the sandy gravel did. The field test results showed EMCW had the characteristics of small deformation and the time effect of loading. The p–s curves indicated that the bearing capacity of construction waste improved after 1 year’s filling. These phenomena were mostly caused by the complexity, diversity, and inhomogeneity of EMCW. According to the proposed control standards of settlement and lateral deformation, as a method of foundation treatment, EMCW was an effective way to build a large piled mountain on soft soil foundation. © 2017 Springer International Publishing Switzerland

Wang Z.Q.,Hebei University of Technology | Wang L.H.,Tianjin Institute of Geological Survey
Advanced Materials Research | Year: 2014

Regional groundwater exploitation is the foundation and basis for the groundwater resources administrative department to plan the rational utilization and protection of local groundwater resources. The dynamics characteristics and regularity of the local groundwater exploitation are studied in Tianjin from 1998 to 2009 by the methods of time-series analysis. The results show that it provides scientific basis for better understanding the present situation of groundwater exploitation objectively and planning the exploitation and utilization of groundwater resources reasonably. © (2014) Trans Tech Publications, Switzerland.

Wang W.-X.,Tianjin Institute of Geological Survey | Cheng X.-J.,Tianjin Institute of Geological Survey | Zhang S.-R.,Tianjin Center | Dong L.-Y.,Tianjin Institute of Geological Survey | Li G.-K.,Tianjin Institute of Geological Survey
Geological Bulletin of China | Year: 2014

Based on the natural heavy mineral and geochemical research for the project of "Mineral Resources Potential Evaluation of Tianjin" in combination with the distribution characteristics of mineral resources in Jixian County area, the authors made a comparative study of the regional prospecting effects for gold, tungsten and molybdenum deposits in Jixian County area by 1:200000 natural heavy mineral prospecting and 1:50000 stream sediment survey, investigated the anomaly distribution characteristics, and discovered new prospecting information. The results show that anomalies delineated by these two methods can directly indicate the ore potential of the corresponding geological bodies. The natural heavy mineral anomaly and the regional geochemical anomaly are fairly consistent with each other for specific mineral assemblage, suggesting that these two kinds of anomalies can both play the guiding role in mineral exploration. ©, 2014, China Geological Survey. All right reserved.

Li G.-K.,Tianjin Institute of Geological Survey | Wang W.-X.,Tianjin Institute of Geological Survey | Li H.,Tianjin Institute of Geological Survey | Yang F.-T.,Jilin University | And 2 more authors.
Geology in China | Year: 2014

Located in the northwest of Zunhua City of Hebei Province, Tangquan is characterized by hilly landscape and rich geothermal resources. In this paper, the authors studied the borehole data of many bedrock thermal wells (water wells) in the study area, and investigated the distribution characteristics and controlling factors of the geothermal field. The results show that borehole temperature is significantly affected by groundwater flow, and the vast majority of temperature wells are characterized by convective heat transfer, with a few temperature wells characterized dominantly by heat transfer conduction. The geothermal anomaly center of the study area is located in the area from Tangquan Fuquan Palace to the sanatorium, and the anomaly center exhibits bipolar distribution; the temperature of water at the depth of 50m in the geothermal anomaly center is about 51∼54°C, and that at the depth of 100m is up to 60∼67°C. The geothermal water of the geothermal system is caused by gradual heating action of surrounding rocks under the normal heat flow background in the process of deep circulation of groundwater. The water storage structure from Fuquan Palace to the sanitarium is formed by a buried basin with granite confining floor. Because faults cut through monolithic granite body, and cause the upward migration of the heat flux of the deep rock along the fault, whereas the heat flux is mixed with fissure water of the gneisses and is concentrated in the area from Fuquan Palace to the sanatorium. Because the gneiss fractures the aquifer in Fuquan Palace area and sanitarium area, the deep heat can quickly reach the shallow strata and give rise to local abnormal high temperature in the shallow part. The geothermal fluid belongs to continental sedimentary water that is formed in the strata with dissolved salt brine, and is mainly derived from meteoric water.

Wang W.-X.,Tianjin Institute of Geological Survey | Li G.-K.,Tianjin Institute of Geological Survey | Li H.,Tianjin Institute of Geological Survey | Hou J.-Y.,Tianjin Institute of Geological Survey | And 2 more authors.
Geology in China | Year: 2013

Located in northwest Zhunhua City of Hebei Province, Tangquan has piedmont hilly landform with abundant geothermal resources. The authors analyzed the geothermal fluid of this area. According to the results obtained, Na +, Ca2+, K+, Mg2+, SO 2- 4, HCO- 3, Cl- and NO- 3 are major elements of the geothermal fluid of this area; hydrochemical types are mainly SO2- 4-Na+; the geothermal fluid is unpolluted and natural weakly alkaline water; the average content of F- of the geothermal fluid is 9.36 mg/1, which is much higher than the national standard of V grade groundwater quality; the content of soluble SiO2 of the geothermal fluid in this area can be used as a geothermometer, the total salinity of the geothermal fluid is 782.33 mg/1 on average, being of fresh water, the geothermal fluid belongs to medium corrosive water, which does not form CaCO3 CaSO4-2H 2O or SiO2 scales; the geothermal fluid belongs to continental sedimentary water formed in the strata with dissolved salt brine. The hydrogen and oxygen stable isotopes show that the geothermal fluid of this area is mainly derived from meteoric water.

Cheng T.,China University of Geosciences | Cheng T.,Tianjin Institute of Geological Survey | Yang W.,Tianjin Institute of Geological Survey | Wang D.,Chinese Academy of Geological Sciences
Geotectonica et Metallogenia | Year: 2014

The Alubaoge granite in Xiwuqi of inner-Mongolia, which is located in the middle segment of the northern margin of North China Craton geologically, consists mainly of porphyritic monzogranite. The Alubaoge granites are characterized by high SiO2 (71.29%~72.12%), high potassium (K2O=4.93%~5.27%, Na2O+K2O=8.70%~8.98%) content, and enriched in LREE, depleted in HREE(LREE/HREE=7.69~12.18), with obviously negative Eu anomaly (δEu=0.08~0.14). While the trace elements are characterized by Rb, Th, K, La, Nd, Hf, Zr, Pb enriched, and Ba, Ta, P, Ti depleted, as well as with high Ga/Al ratio (2.96×10-4~4.00×10-4), high Zr+Nb+Ce+Y value (548×10-6~739×10-6). The chemical signatures belong to A-type granite. In discrimination diagrams, all the samples show geochemical characteristics of A2-type granitoid, which means that the Alubaoge granite may be formed in post-orogenic stage. The zircon LA-ICP-MS U-Pb dating gives a weighted average age of 132.19±0.77 Ma (MSWD=4.6). The age suggests that the granite was emplaced in the Early Cretaceous. Considering the wide distribution of the Late Mesozoic basic and intermediate-acid volcanic rocks in depression basins, the authors suggest that this area was in post-orogenic regime in the Early Cretaceous.

Tian H.,Xi'an University of Science and Technology | Wang W.,Chang'an University | Sun X.,Tianjin Institute of Geological Survey | Deng L.,Chang'an University
2010 4th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2010 | Year: 2010

Aimed at the current situation of nitrogen pollution in groundwater, adsorption characteristics of ammonia-nitrogen onto different lithology named silty sand, silty clay and clay were studied. The results indicated that the process of ammonianitrogen adsorption onto soils mainly occurred within 0~2 h, then attended to a dynamic equilibrium Two kinetic models can describe the experiment data and adsorption onto different lithology obeyed the pseudo second-order kinetic model. The data of the ammonia-nitrogen sorption isotherms at different initial concentration ranges can be fitted by the linear form of Langmuir model remarkably. The maximal adsorption capacity of ammonia-nitrogen ranged from 0.088 to 0.540mg-g-1 . The retardant capacitiy of three lithology to prevent pollution are different and the clay is the best one. © 2010 IEEE.

Wang L.-H.,Tianjin Institute of Geological Survey | Li M.-M.,Tianjin Institute of Geological Survey | Zhang Y.,Tianjin Institute of Geological Survey | Ma W.-M.,Tianjin Institute of Geological Survey | And 2 more authors.
Acta Geoscientica Sinica | Year: 2014

The concentrations of soil heavy metals in a vegetable base of North China were analyzed using field sampling and laboratory test. Environmental quality was evaluated by using the combination of single pollution index and comprehensive pollution index. Health risks of Cd, Hg, Cu and Pb caused by three exposure ways were assessed using USEPA health risk assessment model. The results show that the soil in the studied vegetable base has been polluted by the heavy metals of Cd, Hg, Cu in different degrees, whereas the average concentrations of heavy metals in soil have not exceeded Grade II standard for soil environmental quality. The order of non-carcinogenic risks of three exposure ways of heavy metals in soil is Hg>Cu>Zn>Cd, and the non-carcinogenic risks and the carcinogen risks of metals are both lower than their threshold values. It is thus held that Cd can not be the direct threats to human health.

Fan H.-Y.,Tianjin Institute of Geological Survey | Li M.-C.,Tianjin Institute of Geological Survey | Zhang Q.,Tianjin Institute of Geological Survey | Huang M.,Tianjin Institute of Geological Survey | And 2 more authors.
Geological Bulletin of China | Year: 2014

The Dashizai Formation volcanic rocks in Xi Ujimqin Banner area consist mainly of rhyolite. LA-ICP-MS zircon U-Pb dating and whole-rock major, trace and rare earth elements analyses show that the age of the rhyolite in this area is 280.3Ma±1.4Ma, implying early Permian. Dashizhai volcanic rocks belong to high potassium peraluminous calc-alkaline volcanic rocks, and the content of SiO2, K2O and Al2O3 is high. Chondrite-normalized REE patterns are generally right-oblique with the enrichment of the LREE, Eu exhibits negative anomalies, there exists no significant loss of HREE, Rb, Th, U, K and other LILE elements show significant enrichment, Ba exhibits weak losses, HFSE exhibit obvious Ta, Sr, P and Ti losses, and Zr, Hf shows relative enrichment. It is held that the rhyolite of this area was probably formed by fractional crystallization of basalt, andesite and other basic volcanic rocks, and the tectonic environment for the formation of the rhyolite in this area was continental marginal arc.

Cui Y.,Water Resources University | Su C.,Water Resources University | Su C.,Chinese Academy of Geological Sciences | Shao J.,Water Resources University | And 2 more authors.
Journal of Earth Science | Year: 2014

In this paper, a coupled numerical groundwater and land subsidence model was developed for the Tianjin Plain. The model was employed to investigate the groundwater resources and their changes over the last decade, and to further predict the changing patterns of the groundwater level and associated land subsidence in future. First, according to the regional hydrogeology, the simulation area was defined with an area of 10.6×103 km2, which was divided into six aquifer units. A coupled groundwater and land subsidence numerical model was built by using Modflow2005 and the land subsidence simulation module SUB (subsidence and aquifer-system compaction), in which the groundwater flow was modeled as three-dimensional unsteady flow and the land subsidence simulation was based on one-dimensional consolidation theory. The model was then calibrated by using the groundwater level contour lines, hydrographs, and land subsidence hydrographs over the period of 1998–2008. In addition, groundwater balance analysis of the simulation period indicated that under multi-year groundwater withdrawal condition the cross-flow recharge, compression release, and lateral boundary inflow contributed 44.43%, 32.14%, and 21.88% to the deep aquifer recharge, respectively. Finally, the model was applied to predict the changing patterns of the groundwater levels and the associated variations in land subsidence under the control of groundwater exploitation after implementation of the south-to-north water diversion project. The simulation results demonstrated that the groundwater level may gradually increase year by year with an decrease in the groundwater withdrawal; and the land in dominated land subsidence regions including the urban area, Dagang, Hangu, Jinghai, Wuqing, and Jinnan, may rebound at an average rate of 2–3 mm/a, and the land subsidence rate in the other regions may decrease. © China University of Geosciences and Springer-Verlag Berlin Heidelberg 2014.

Loading Tianjin Institute of Geological Survey collaborators
Loading Tianjin Institute of Geological Survey collaborators