Selection of Groundwater Control Scheme for Deep Excavation in Alluvial Soil along the Yellow River

2012 ◽  
Vol 212-213 ◽  
pp. 323-326 ◽  
Author(s):  
Hua Yuan ◽  
Zhi Liang Zhao ◽  
Yun Hua Li
Keyword(s):  
Yellow River ◽  
Alluvial Soil ◽  
High Water ◽  
High Water Content ◽  
The Yellow River ◽  
Deep Excavation ◽  
Foundation Pit ◽  
Water Head ◽  
Control Scheme ◽  
Geological Conditions

Kaifeng locates on a flat and open alluvial plain of the middle and lower reaches of the Yellow River. Owing to its complex history and long-term deposition, a silty stratum with multi-miscellaneous fill and alluvial soil interphase is gradually formed. Combing with the soil actual characteristics of Kaifeng area, which is mainly composed of “high water content”, “high water head”, “strong permeability”, “low strength”, “adequate water supply”, a optimal groundwater control scheme for deep excavation under above complicated geological conditions is proposed. Moreover, the most appropriate waterproof curtain form is recommended for the foundation pit engineering whose excavation depth is less than 10m. The findings of this investigation may offer some suggestions for the choice of groundwater control scheme for construction purpose in similar strata.

scholarly journals Horizontal Bearing Test and Optimization of m Value for Precast Piles in Alluvium Stratum of the Yellow River

2018 ◽  
Vol 2018 ◽  
pp. 1-13
Author(s):  
Xianzhou Lyu ◽  
Zhen Chen ◽  
Zenghui Zhao ◽  
Weiming Wang
Keyword(s):  
Bearing Capacity ◽  
Yellow River ◽  
Back Analysis ◽  
Horizontal Displacement ◽  
The Yellow River ◽  
Analysis Model ◽  
Foundation Design ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Geological Conditions

For a pile foundation design, the value of proportional coefficient m to define the soil horizontal resist force is a significant parameter. However, different geological conditions and experimental environment have led to different m values. In this paper, an in situ test is firstly carried out on the horizontal bearing capacity of large-size precast square-piles. The piles deformation is then derived by using the optimization method from the measured data. Secondly a back analysis model is established to calculate the m value by using the simplex method, which reveals the evolution rule of the value of proportional coefficient m. Results show that the horizontal bearing characteristics of precast piles depend on the interaction force of piles and soils. The action mechanism of the soils around the piles is gradually developed with the increase in the concrete content. The horizontal critical load and the Eigenvalue of horizontal bearing capacity increased by 16.7% and 20%, respectively. It is also seen that the higher the content of the cement-soil around the piles and the longer the pile length, the bigger the m value obtained. The variation of the proportional coefficient m with the horizontal displacement of pile top is defined by three stages: rapid decaying stage, slow decaying stage, and balanced stage, respectively. The inverse analysis method on the proposed m value can accurately reflect the actual working state of piles and soils. In the depth of 3~18m in the west of Ji'nan, the range of m value is recommended as 4~6.58 MN·m-4. When Δ takes 12mm, the values of m are consistent with the result from the back analysis. In summary, the obtained m value can be effectively used to guide the design of enclosure structure in the super deep foundation pit in the Yellow River alluvial stratum.

scholarly journals Investigation on Dewatering of a Deep Shaft in Strong Permeable Sandy Pebble Strata on the Bank of the Yellow River

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Yuchao Zheng ◽  
Jianyong Lei ◽  
Fei Wang ◽  
Liang Xiang ◽  
Jianfeng Yang ◽  
...  
Keyword(s):  
Permeability Coefficient ◽  
Yellow River ◽  
Pumping Test ◽  
The Yellow River ◽  
Construction Process ◽  
Deep Excavation ◽  
Ground Settlement ◽  
High Permeability ◽  
Reverse Analysis ◽  
Table Versus

This paper reports the dewatering scheme of a deep excavation in sandy pebble strata. The excavation is in high permeability strata and is close to the Yellow River, making the dewatering difficult during construction. At present, few researchers have specially studied the dewatering scheme of deep excavations in strong permeable strata near the water resource. Field pumping test was conducted before the excavation activity, and the permeability coefficient of the strata was obtained by reverse analysis. According to the characteristics of the project, the dewatering scheme of “ waterproof   curtain + base   grouting + pumping ” was proposed. The influence of vertical waterproof curtain and base grouting on dewatering was analyzed by numerical simulation. In the construction process, the field water table and ground settlement were measured. The results show that (1) the groundwater table versus permeability coefficient curve shows three different stages and (2) the dewatering scheme of “ waterproof   curtain + base   grouting + pumping ” is effective for deep excavation in strong permeable strata.

Evaluation on Effect of Building Settlement due to Adjacent Deep Excavation

2012 ◽  
Vol 170-173 ◽  
pp. 637-646
Author(s):  
Jun Sheng Chen ◽  
Hai Hong Mo ◽  
Shuo Zhuo Liu
Keyword(s):  
Stability Analysis ◽  
Adjacent Area ◽  
Analysis Method ◽  
Deep Excavation ◽  
Complex Environment ◽  
3D Fem ◽  
Foundation Pit ◽  
Geological Conditions ◽  
Compound Method ◽  
Ground Stability

A compound method which includes overall site stability analysis, stratum stability analysis on deep excavation boundary and 3D FEM is proposed to evaluate the effect of building settlement due to adjacent deep excavation. A typical deep excavation project was used to evaluate the feasibility of the compound method. The analysis results indicate the ground stability analysis is useful to understand the stratum situation of deep excavation and adjacent area. In 3D FEM, undulate stratum can simulate the supporting system of more accurately. The compound method brings a new analysis method for foundation pit project in complex environment and complex geological conditions.

Formation and Stablity of the Sky Pond Landslide Dam, China

2011 ◽  
Vol 243-249 ◽  
pp. 3189-3200 ◽  
Author(s):  
Yan Hui Song
Keyword(s):  
Yellow River ◽  
Limit Equilibrium ◽  
Landslide Dam ◽  
Equilibrium Analysis ◽  
Qualitative Assessment ◽  
Hydropower Station ◽  
The Yellow River ◽  
Geological Conditions ◽  
Dammed Lake ◽  
The Stability

The Sky Pond landslide dam is located in Muchang valley, a branch of the Yellow River branches. From this point it is about 6Km to the mouth of the valley from where the Yellow River flows 0.8Km downwards to the planned Jishi gorge hydropower station. The Sky Pond landslide dam is actually formed by two landslides from both the left and right bank slopes and completely blocks the seasonal river channel. The volume of the landslide dam is about 14 millions m3 with 2.37 millions m3 water stored in the dammed lake under the condition of perennial mean water level. Because (1) the dam body is large in width and thickness; (2) the dammed lake water is small both in volume and weight compared to the landslide dam; (3) recharge to the dammed lake is basically the same as the discharge every year; and (4) there is a natural spillway in the dam body, the landslide dam is present at least 750 years after its formation. Although landslide dams which have existed for several hundreds to thousands of years are generally considered as stable, there are remains which may fail catastrophically. In order to analyze the stability of the Sky Pond landslide dam and provide justification for the future engineering decisions, this paper describes the engineering geological conditions near the landslide dam and the characteristics of the dam body, and a detailed discussion of the formation mechanism of the landslide. Based on engineering geology investigation, a qualitative assessment of the stability of the dam and an analysis of the probability of dam overtopping and piping is carried out. Limit equilibrium analysis has been used to calculate the stability of the dam slope under various operational conditions. Results of the stability analyses indicate that the Sky Pond landslide dam should remain stable and does not present a potential theat to the planned hydropower station.

A Discussion of the Stability of Foundation Pit or Slope with Soft Interlayer or with Back Berm

2014 ◽  
Vol 1065-1069 ◽  
pp. 96-99
Author(s):  
Hai Ying Hu ◽  
Xiao Wen Zhou ◽  
Zhi Xing Huang
Keyword(s):  
Bearing Capacity ◽  
Soft Soil ◽  
High Water ◽  
High Water Content ◽  
Sliding Surface ◽  
Foundation Pit ◽  
Soft Interlayer ◽  
The Difference ◽  
The Stability ◽  
Slice Method

The soft soil in Pearl River Delta regions is characterized with high water content, high compressibility and low bearing capacity. Therefore, when building the structures on such foundation, it’s necessary to pay attention to the deformation and stability. The projects' practice shows that, when analyzing the stability on foundation pit or slope with soft interlayer, it should not only calculate the overall stability of the slope, but also calculate the stability or bearing capacity of the foundation. Although sometimes the stability of the slope meets the requirements, it doesn’t means that the bearing capacity of the foundation meets the requirements because of the existence soft interlayer, the limitations of the circle slice method and the difference between the sliding surface and the actual sliding surface.

Experiment Study on One Dimensional Vertical Soil Pole Seeper Infiltration of Unsaturated Clayey Sand

2011 ◽  
Vol 250-253 ◽  
pp. 3785-3789
Author(s):  
Qiang Qiang Miao ◽  
Zheng Han Chen ◽  
Qing Qing Zhu ◽  
Zhi Hua Yao ◽  
Jun Hao Zhang
Keyword(s):  
High Water ◽  
Measuring System ◽  
High Water Content ◽  
Dry Density ◽  
Experiment Study ◽  
Time Pass ◽  
Clayey Sand ◽  
One Dimensional ◽  
Water Head ◽  
The Relationship

Measuring system of soil moisture and water bedload LGD-Ⅲ was used in those tests . Infiltration law of one dimensional vertical soil poles were carried out profound studies,under different density and a constant water head . At the same time,the course of wetness front along with time pass away, infiltration law along with time pass away and different high water content along with time pass away were made a comprehensive studies , under different dry density. According to a great deal of test data, the relationship between wetness front and time was given to a function under different dry density.

Risk Analysis during Departure and Reception of Shield in the Yellow River Crossing Tunnel of the Middle Route Project of South-to-North Water Diversion

2011 ◽  
Vol 90-93 ◽  
pp. 2125-2130
Author(s):  
Zhi Lin Dun ◽  
Yang Cao ◽  
Lian Wei Ren
Keyword(s):  
Evaluation Method ◽  
Large Deviation ◽  
Yellow River ◽  
Reference Value ◽  
Fuzzy Comprehensive Evaluation ◽  
Water Diversion ◽  
The Yellow River ◽  
Mechanical Equipment ◽  
Geological Conditions ◽  
North Water

In the Yellow River crossing tunnel of the middle route project of South-to-North water diversion, its geological conditions are very complicated, so potential risks are much likely to occur in the construction. Based on the fault tree analysis, fuzzy comprehensive evaluation method is also used for the quantitative analysis on the risks during the departure and reception phase of the tunnel construction. And it turns out that, there are risks of collapse of working well, leakage and plasma leakage, mechanical equipment failure and large deviation from the designed axis during the construction. Finally, the measures available of risk aversion are put forward, which have achieved good field applications and also provided some reference value for similar projects in the future construction.

scholarly journals Study on the Bearing Characteristics and Application of the Filling Body in Original Roadway Filling and Nonpillar Driving

Lithosphere ◽  
2021 ◽  
Vol 2021 (Special 4) ◽  
Author(s):  
Wenbao Shi ◽  
Yan Li ◽  
Jucai Chang
Keyword(s):  
Water Content ◽  
Coal Mining ◽  
High Water ◽  
High Water Content ◽  
Working Face ◽  
Geological Conditions ◽  
Analysis Laboratory ◽  
The Stability ◽  
And Control

Abstract Original roadway filling and nonpillar driving can effectively solve the difficulty facing mining replacement in the stope of deep mines. As the bearing characteristics of the filling body in the original roadway play a crucial role in the structural stability of the overlying strata, with the recovery and geological conditions of 62210 working face in Xinzhuangzi Coal Mine, Huainan Mining Group, China, as the background, this study analyzed the stability characteristics of the filling body in the original roadway through comprehensive research methods of theoretical analysis, laboratory tests, and onsite monitoring. The results disclose that the filling body in the original roadway should boost early strength, strong bearing capacity, and long-term weakening. When the water-cement ratios are 1 : 1, 1.5 : 1, 2 : 1, 2.5 : 1, and 3 : 1, the strengths of the filling body are 1.12 MPa, 0.93 MPa, 0.57 MPa, 0.33 MPa, and 0.21 MPa at 2 h and 5.63 MPa, 4.66 MPa, 2.87 MPa, 1.65 MPa, and 1.02 MPa at 48 h, respectively. The strengths surge by 5 times within 2 d on the whole and reach the maximum at about 7 d, i.e., 8.12 MPa, 6.91 MPa, 6.60 MPa, 3.95 MPa, and 2.20 MPa, respectively. As time goes, the water content of the filling body gradually decreases and the compressive strength plunges. This demonstrates that the rapid solidification material with a high water content can satisfy the requirements of the bearing characteristics of the original roadway filling body. With reference to numerical simulation and the data monitored onsite, it can be known that the filling body in the original roadway can support the roof effectively and control the surrounding rock deformation of newly excavated roadways in the lower section. The research results provide theoretical guidance for coal mining under similar geological conditions and serve as reference for safe and efficient coal mining.

Application of Water-Proof Curtain with High-Pressure Injection Concrete Piles in Foundation Pit

2015 ◽  
Vol 744-746 ◽  
pp. 447-450
Author(s):  
Quan Chen Gao ◽  
Zhuo Yang ◽  
Hong Bo Wang ◽  
Han Lu Fu ◽  
Rong Bin Zhou ◽  
...  
Keyword(s):  
High Pressure ◽  
Soil Layer ◽  
High Water ◽  
Underground Water ◽  
High Water Content ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Foundation Soil ◽  
World Center ◽  
Water Proof

This paper introduces a design program for supporting of deep foundation pit through the actual example for Beijing Moisten the world Center project to solve the difficulties of high water content in foundation soil, sensitiveness to surroundings, and difficult control of quick sand and flowing mud in the process of supporting of foundation pit. This program adopts a supporting system with upper soil nailing wall and lower pre-stressed anchor pile and a comprehensive water-proof curtain (Retaining piles + Long spiral high pressure jet grouting & mixing piles) to effectively solve the above difficulties. It is indicated through actual monitoring that displacement and settlement of foundation pit meet the specification and design requirements with excellent water-proof effect. The successful application of this program provides a reference for foundation pit engineering with rich underground water, especially for engineering at hard soil layer and stratum with sand and gravel that are apt to the formation of cement-soil grouting and mixing piles, as well as engineering with limitation on dewatering of foundation pit.

Influence of Water Content on the Strength of Silt Soil in Yellow River Alluvial Plain

2012 ◽  
Vol 256-259 ◽  
pp. 481-487
Author(s):  
Xiao Ming Yi ◽  
Song Gen Wang ◽  
Zhen Qing Liu ◽  
Gang Xu
Keyword(s):  
Elastic Modulus ◽  
Water Content ◽  
Yellow River ◽  
Friction Angle ◽  
Cohesive Soil ◽  
High Water ◽  
Alluvial Plain ◽  
High Water Content ◽  
Optimum Water Content ◽  
Influence Of Water

Hydrophilic characteristic of silt soil in Yellow River alluvial plain was studied in order to reveal the water content changes of silt. Then strength tests were used to research how engineering parameters such as elastic modulus, cohesion and friction angle change at different water content. The results show that high permeability coefficient and strong capillary are main factors to increase the water content, and the influence of capillary rising is greater than that of rainfall infiltration. The strength characteristic of silt soil is similar to the character of non-cohesive soil in low water content and that of clay in high water content. If the water content is greater than optimum water content, the elastic modulus and cohesion of silt shall decay obviously. Friction angle decreases dramatically as well, when the soil is saturated.

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