A Study on Engineering Properties and Counter-measures of Soft Rock and Soil Tunnels of Wanjiazhai Yellow River Diversion Project

2021 ◽  
pp. 159-178
Author(s):  
Song Yue
Keyword(s):  
Yellow River ◽  
Soft Rock ◽  
Engineering Properties ◽  
River Diversion ◽  
Counter Measures ◽  
Rock And Soil

scholarly journals Consolidation and Deformation Characteristics of Soft Rock Foundation in Hydrological Wetland Environment

2020 ◽  
Vol 24 (2) ◽  
pp. 183-190
Author(s):  
Bin Liu ◽  
Xiugen Jiang
Keyword(s):  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Soft Soil ◽  
Soft Rock ◽  
Rock Foundation ◽  
Deformation Characteristics ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Rock And Soil

The widespread distribution of soft rock and soft soil in hydrological wetland environment is a common geotechnical engineering problem encountered in coastal engineering construction. To solve this problem, a study method for consolidation and deformation characteristics of soft rock and soft soil foundation in hydrological wetland environment is proposed. Taking K9+280-K11+120 section along Fu-Nehe section of National Highway 111 as the research object, the consolidation and deformation characteristics and loading conditions of soft soil foundation under embankment filling load, treatment methods of soft rock foundation, stratum conditions, temperature changes and time effects are analyzed. The results show that although the wetland soft rock and soil layer is not thick, the settlement of soft rock and soil accounts for more than 80% of the total settlement. Negative temperature has a certain influence on the consolidation settlement of soft rock foundation, which is mainly manifested in the difference between the settlement process of the central separation zone and the roadbed soft soil foundation; the pore water pressure of soft rock foundation dissipates to varying degrees. According to the monitoring results of settlement and pore water pressure, bagged sand wells are more suitable for soft rock foundation engineering treatment in hydrological wetland. The research results can provide a reference for the study, calculation and design of consolidation and deformation of soft rock foundation in hydrological wetland.

The distribution, formation and engineering properties of Quaternary regional Sediments in China

1991 ◽  
Vol 7 (1) ◽  
pp. 491-501
Author(s):  
G. Guorui
Keyword(s):  
Yellow River ◽  
Southern China ◽  
Expansive Soils ◽  
Northern China ◽  
Climatic Conditions ◽  
Engineering Properties ◽  
Geographical Environment ◽  
Development Processes ◽  
Relationship Of ◽  
The Relationship

AbstractIn China, there exist various regional sediments of the Quaternary such as loess soils of the Yellow River in northern China, lateritic soils in southern China and expansive soils in the broad plains of the Yangtze River. In the past, these Quaternary Sediments were often treated as special soils and their engineering properties tended to be studied accordingly. However, not much attention was given to relationships that may exist between these regional soils and, so far, the distribution and formation of regional Sediments have not been systematically studied. Only when it was found that regional classifications of soils (their names and their engineering properties) were in disagreement with each other for adjacent areas was the subject of relationship considered.Recently, the author has tested and studied a number of samples of various Quaternary regional Sediments. The relationship of their composition and microstructural features to their engineering properties has first been analysed on the basis of their basic properties. The distribution of regional sediments has then been studied in detail according to geographical environment and climatic conditions. Finally, formation and development processes for the various regional Sediments of the Quaternary in China have been postulated.

Investigation on Shear Creep Mechanical Properties of Soft Rock

2011 ◽  
Vol 261-263 ◽  
pp. 1024-1028
Author(s):  
Yu Wang ◽  
Jian Lin Li
Keyword(s):  
Soil Mechanics ◽  
Testing Machine ◽  
Soft Rock ◽  
Underground Engineering ◽  
Shear Creep ◽  
Analysis Of Stability ◽  
The Stability ◽  
Argillaceous Siltstone ◽  
Rock And Soil

The construction of slope or underground engineering often encounters soft rocks, which control the stability of rock engineering, with obvious characteristics of rheology. Under step load conditon, the shear creep test of argillaceous siltstone is performed by using the RMT150c rock and soil mechanics testing machine. Testing results show that the amount of creep deformation for argillaceous siltstone is big enough, which should be taken into consideration for analysis of stability or design of slope or underground engineering. Based on testing results, the long-term shear strength parameters are determined to provide theory basis for engineering survey and design.

scholarly journals Effects of Water Replenishment from Yellow River on Water Quality of Hengshui Lake Wetland

2018 ◽  
Vol 1 (1) ◽  
pp. 58-62
Author(s):  
Xu Weigang ◽  
Yu Yilei ◽  
Yu Yilei ◽  
Ma Muyuan ◽  
Ma Muyuan ◽  
...  
Keyword(s):  
Water Quality ◽  
Yellow River ◽  
Pollution Index ◽  
Water Diversion ◽  
Ecological Environment ◽  
River Diversion ◽  
Natural Lakes ◽  
Artificial Water ◽  
Lake Wetlands

Hengshui Lake Wetland is the only national wetland and bird nature reserve in the North China Plain. It plays an important role in maintaining the species diversity and ecological balance. In recent years, due to industrial and agricultural production, infrastructure and ecological environment construction and other reasons, the infiltration, runoff, evapotranspiration and other water balance elements was changed, which reduced runoff into the lake. In order to ease the tense water resources situation in the region, Hengshui Lake is replenished each year by Yellow River water. Although Diversion Yellow River Wetland has made direct water supply protection, but also affected the ecology and environment of Hengshui Lake wetlands. In order to understand how artificial water diversion can affect the ecological environment of natural lakes, this paper analyzes the effects of artificial water storage on the water quality of the lake by using the measured data of water samples in the lake. The results showed that the water level of Hengshui Lake showed an upward trend after the diversion from the Yellow River. Comprehensive pollution index showed a downward trend, but Hengshui Lake wetlands are still slightly polluted. Diversion of Yellow River diversion into the lake of the ecological health of Hengshui also caused some impact.

Study on the Correlation of N, P Nutrients and Chlorella Growth

2014 ◽  
Vol 641-642 ◽  
pp. 1183-1186 ◽  
Author(s):  
Jun Sen Wu ◽  
Rui Bao Jia ◽  
Bing Li ◽  
Chen Chen Liu
Keyword(s):  
Nitrogen Source ◽  
Chlorella Vulgaris ◽  
Yellow River ◽  
Limiting Factor ◽  
Optimum Ratio ◽  
River Diversion ◽  
Algae Biomass ◽  
Experimental Subjects ◽  
The Relationship ◽  
Water Eutrophication

In this paper, the Chlorella vulgaris in Yellow River Diversion reservoir was selected as experimental subjects to cultivate in laboratory. The the relationship between algae biomass and N,P was studied from the following aspects：the type of nitrogen source, the concentration of N and P，and the ratio of N and P. It was found that KNO3 was one of the best nitrogen source for growth of Chlorella vulgaris. Chlorella vulgaris can live at the lower N concentration, while it was very difficult to survive in the absence of P. So P is the limiting factor for its growth. In addition, the optimum ratio of nitrogen to phosphorus was 16:1, for Chlorella vulgaris’s growth. It was similar to the algae outbreak in the water eutrophication, glycine as the Chlorella nutrition, the algae grew slow at early and later rapid.

The Risk and Disease Analysis and Disposal of Yellow River Sluices in Shandong

2014 ◽  
Vol 584-586 ◽  
pp. 2096-2098
Author(s):  
Jian Cheng Yang ◽  
Yan Li ◽  
Yan Bo Zhao ◽  
You Zhi Wang ◽  
Yi Lin Wang
Keyword(s):  
Yellow River ◽  
Shandong Province ◽  
The Yellow River ◽  
River Diversion ◽  
Operational Safety ◽  
Disease Analysis ◽  
Design Construction

The sluices of the Yellow River Diversion Project in Shandong Province are mostly constructed from 1970s to 1990s. According to the regular examination records and the safety appraisal reports, the majority of these sluices are operating with risks and diseases. This paper analyses several factors in terms of design, construction and management, and proposes corresponding disposal strategies. The analysis indicates that regular examination, well maintenance and perfect control are strongly recommended; meanwhile reinforcement should be applied in sluices with risks and diseases to guarantee the operational safety.

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