Analytical modeling on consolidation of stiffened deep mixed column-reinforced soft soil under embankment     

Zhen Zhang  Fengrui Rao  Guanbao Ye 《国际地质力学数值与分析法杂志》2020,44(1):137-158

Stiffened deep mixed (SDM) column is a new ground improvement technique to improve soft soil, which can be used to increase bearing capacity, reduce deformation, and enhance stability of soft soil. This technique has been successfully adopted to support the highway and railway embankments over soft soils in China and other countries. However, there have been limited investigations on its consolidation under embankment loading. This paper developed an analytical solution for the consolidation of embankment over soft soil with SDM column in which core pile is equal to or shorter than outer DM column. The consolidation problem was simplified as a consolidation of composite soil considering the load shear effect of core pile. The developed solution was verified by a comparison with the results computed by three-dimensional (3-D) finite element analysis. A parametric study based on the derived solution was conducted to investigate influence factors—length of core pile, diameter of core pile, diameter of SDM column, modulus of DM column, and permeability coefficient of DM column—on the consolidation behavior of SDM column-supported embankment over soft soil. The developed solution was applied to a case history of SDM column-supported embankment, and a good agreement was found between the predictions and the field measurements.  相似文献   

Characterization of Kota Sandstone Under Different Strain Rates in Uniaxial Loading     

Md. Shams Alam  Tanusree Chakraborty  Vasant Matsagar  K. Seshagiri Rao  Prince Sharma  Manjit Singh 《Geotechnical and Geological Engineering》2015,33(1):143-152

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Simulation of heavy rainfall events over Indian region: a benchmark skill with a GCM     

Prashant Goswami  B. Kantha Rao 《Climate Dynamics》2015,45(7-8):1899-1911

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Water uptake of riparian plants in the lower Lhasa River Basin,South Tibetan Plateau using stable water isotopes     

Wenbo Rao  Xi Chen  Karina T. Meredith  Hongbing Tan  Man Gao  Jintao Liu 《水文研究》2020,34(16):3492-3505

Riparian plants can adapt their water uptake strategies based on climatic and hydrological conditions within a river basin. The response of cold-alpine riparian trees to changes in water availability is poorly understood. The Lhasa River is a representative cold-alpine river in South Tibet and an under-studied environment. Therefore, a 96 km section of the lower Lhasa River was selected for a study on the water-use patterns of riparian plants. Plant water, soil water, groundwater and river water were measured at three sites for δ¹⁸O and δ²H values during the warm-wet and cold-dry periods in 2018. Soil profiles differed in isotope values between seasons and with the distance along the river. During the cold-dry period, the upper parts of the soil profiles were significantly affected by evaporation. During the warm-wet period, the soil profile was influenced by precipitation infiltration in the upper reaches of the study area and by various water sources in the lower reaches. Calculations using the IsoSource model indicated that the mature salix and birch trees (Salix cheilophila Schneid. and Betula platyphylla Suk.) accessed water from multiple sources during the cold-dry period, whereas they sourced more than 70% of their requirement from the upper 60–80 cm of the soil profile during the warm-wet period. The model indicated that the immature rose willow tree (Tamarix ramosissima Ledeb) accessed 66% of its water from the surface soil during the cold-dry period, but used the deeper layers during the warm-wet period. The plant type was not the dominant factor driving water uptake patterns in mature plants. Our findings can contribute to strategies for the sustainable development of cold-alpine riparian ecosystems. It is recommended that reducing plantation density and collocating plants with different rooting depths would be conducive to optimal plant growth in this environment.  相似文献   

Roughness Lengths at Four Stations Within the Micrometeorological Network over the Indian Monsoon Region     

N. Narendra Reddy  Kusuma G. Rao 《Boundary-Layer Meteorology》2016,158(1):151-164

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Coralline algae and benthic foraminifera from the long formation (middle Miocene) of the Little Andaman Island,India: Biofacies analysis,systematics and palaeoenvironmental implications     

Suman Sarkar  Amit K. Ghosh  G. M. Narasimha Rao 《Journal of the Geological Society of India》2016,87(1):69-84

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Estimation of Partial Pressure of Carbon Dioxide and Air-Sea Fluxes in Hooghly Estuary Based on In Situ and Satellite Observations     

P. C. Padhy  R. K. Nayak  V. K. Dadhwal  M. Salim  D. Mitra  S. B. Chaudhury  P. R. Rao  K. H. Rao  C.B. S. Dutt 《Journal of the Indian Society of Remote Sensing》2016,44(1):135-143

An empirical model is developed and used with remotely sensed predictors: sea surface temperature (SST) and chlorophyll-a concentration (Chl-a), to compute surface water partial pressure of carbon dioxide (pCO_2w) and air-sea fluxes of CO₂ in the Hooghly estuary and its adjacent coastal oceans. In situ observations used here were based on measurements carried out in this region during winter and summer periods in 2008. The estimated pCO_2w compares well with the in situ observations at root mean square error ±18 μatm. In winter, estimated pCO_2w ranges between 320 and 500 μatm with large values (>400 μatm) on the south-western and south-eastern flanks of the coastal domain and lower values (340–375 μatm) on the main-channel. In summer, it remained spatially uniform at 450 μatm. Extrapolation of the results over the study region based on the Moderate Imaging Specroradiometer (MODIS) measured SST and Chl-a suggests that the region is a strong source of atmospheric CO₂ during the summer with net release of 0.095 Tg C year^?1 (equivalent to mean flux of 90 molC m^?2 year^?1) and is a weak source during the winter with net release of 0.006 Tg C yr^?1 (0.5 molC m^?2 year^?1) from the geographical extent of 6000 Km² area.  相似文献   

On the relation of vegetation and southwest monsoon rainfall over Western Ghats,India     

T. V. Lakshmi Kumar  Koteswara Rao  R. Uma  Humberto Barbosa  K. V. K. R. K. Patnaik  Emily Prabha Jothi 《Natural Hazards》2016,80(1):425-444

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Petrogenesis of Mesoproterozoic lamproite dykes from the Garledinne (Banganapalle) cluster,south-western Cuddapah Basin,southern India     

N. V. Chalapathi Rao  Atiullah  Alok Kumar  Samarendra Sahoo  Purnendu Nanda  Ngazimpi Chahong  B. Lehmann  K. V. S. Rao 《Mineralogy and Petrology》2016,110(2-3):247-268

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The Blasting Test and Blasting Vibration Monitoring of Vertical Crater Retreat Mining Method in the Luohe Iron Mine     

Zhenbin Rao  Sijing Cai 《Geotechnical and Geological Engineering》2016,34(4):1047-1056

Because the land requisition and demolishing became difficult more and more, the mining scheme of Luohe iron mine was changed from caving method to filling method. In order to ensure the safety of the residence and the underground tunnel cavern within the mobile belt of the underground mining, the Luohe iron mine did the blasting test on the vertical crater retreat mining method and blasting vibration monitoring. The blasting experiments use common emulsified oil explosives and non-electric initiation system. The way of caved ore adopts the cutting groove and bench side. The NUBOX-6016 intelligent vibration monitor was chosen in the blasting vibration monitoring. Twice experiments on the blasting vibration monitoring were done on the surface or in the underground refuge cavern. The first test select the three monitoring points on the ground and the second select two monitoring points on the ground and a monitoring point in the underground refuge cavern. The blasting vibration monitoring data were conducted by the regression analysis in the Sodev’s empirical formula. The vibration attenuation formula about the underground blasting vibration transmitting in three directions is derived. The blasting test on the vertical crater retreat mining method and the blasting vibration were analyzed. It is estimated if the vibration damage possibly the surface buildings and related facilities of mine.  相似文献