RESEARCH ON EENGINEERING PROPERTIES AND TREATING MEASURE OF DECAYED WOOD AND SILT MIXED SOIL OF JIEPU SPEEDWAY
RESEARCH ON EENGINEERING PROPERTIES AND TREATING MEASURE OF DECAYED WOOD AND SILT MIXED SOIL OF JIEPU SPEEDWAY
Ling Zhi Shan, Rui Yu, Mingdong Li
Zhongzi Planning and Design Research Co., Ltd
Jiangxi Highway Investment Co., Ltd
East China University of Technology
Copyright © 2022 by Cayley Nielson Press, Inc.
ISBN: 978-1-957274-08-9
Cayley Nielson Press Scholarly Monograph Series Book Code No.: 212-4-7
Series of Scientific Advances in Geological Environment & Underground Engineering, Volume VII
Editor in chief: Li, Mingdong and Xue, Kaixi（李明东，薛凯喜）
Editors: Yi, Jinxiang; Zhang, Jingwu; Zhu, Liping; Yang, Ting; Xu, Tao; Wang, Shengfu; Shan, Lingzhi; Wan, Yukuai (易进翔，张京伍，朱丽萍，杨婷，许涛，王升福，单凌志，万愉快)
US$150.00
Preface
Rotten wood and Silt Mixed Soil（RWSMS）is an specialkind of soft soil which has been found in the foundation of Jiepu expressway of Guangdong province.It has the characteristic of high water ratio,high compressibility and low permeability.Rotten Wood and Silt Mixed Soil distribute broadly in Guangdong province and other provinces. With the change of geological origin and geological environment, the content of rotten wood and the degree of decay in the rotten wood and silt mixed soil is different, which causes the different engineering properties of the rotten wood and silt mixed soil. In order to clarify the relationship here, this paper used more than 100,000 words to describe.So,the study on the engineering properties of Rotten Wood and Silt Mixed Soil has the great significance to guide the construction of other project on the same layer.The main work of the theis is as follows:
With the change of geological origin and geological environment, the content of rotten wood and the degree of decay in the rotten wood and silt mixed soil is different, which causes the different engineering properties of the rotten wood and silt mixed soil. In order to clarify the relationship here, this paper used more than 100,000 words to describe.
1 It is point out the consolidation settlement mechanics of Rotten Wood and Silt Mixed Soil by comparing the composition content,physical and mechanical index of rotten wood with silt’s and analysis the difference on consolidation,compression, secondary consolidation between them.
2 Make up threekinds rotten wood and silt mixed soil which the rotten wood percent respectively are five,forty and seventy.It is respectively represent these circumstances which the rotten wood percent is few, middling and much.The variable law of mechanical properties of threekings rotten wood and silt mixed soil were analyzed by consolidation tests, compression tests and secondary consolidation tests.
3 The transformation of pore water pressure and permeability coefficient of rotten wood and silt mixed soil in consolidation process was analyzed with the handling consolidometer which can measure pore water pressure and permeability coefficient.
4 Educe the strength index by cu-test and cd-test of rotten wood and silt mixed soil which has different rotten wood content.Analyzing the mechanics of strength index and the relationship between strength index and rotten wood content.Contrast the strength index of rotten wood and silt mixed soil with silt’s in this paper too.
5 Analyzing the settlement and stabilization of rotten wood and silt mixed soil by using plaxis,the compute result proved that the parameter which get from indoor test is correct.
6 The settlement law of rotten wood and silt mixed soil was analyzed by using observation data and verify the conclusion which draw from indoor test, It is also conclude the best treating way of rotten wood and silt mixed soil by computing.
Key words: Rotten wood and silt mixed soil; tests; deformation character; strength character; program checking calculation; foundation treatment way;
Zhongzi planning and Design Research Co.,Ltd
Beijing, China
February 10,2022
Contents
Preface I
Chapter 1 Introduction 1
1.1 Propose The Problems 1
1.2 The Main Research Work Of This Paper 5
Chapter 2 The Study Of Engineering Geology Origin And Environment Of Rotten Wood And Silt Mixed Soil 8
2.1 Basic Characteristics Of Sapropelic Soil Layers 14
2.1.1 General Characteristics Of Soil Layers Of Decayed Wood 14
2.1.2 Results Of Sporopollen Analysis In Soil Layer 15
2.1.3 Chemical And Mineral Composition 25
2.2 Formation Environment Of Sapropelic Soil Layer 29
2.3 Conclusion 34
Chapter 3 The Deformation Characteristics Of Rotten Wood And Silt Mixed Soil Are Studied By Laboratory Test 38
3.1 Development Of Test Equipment 38
3.2 Undisturbed And Disturbed Soil Samples 39
3.3 Determination Of Basic Physical Indexes Of Rotten Wood And Silt Mixed Soil 42
3.4 Determination Of Consolidation Coefficient Of Saw-Silt Mixed Soil By Laboratory Test 45
3.4.1 Calculation Of Consolidation Coefficient According To Consolidation Settlement Curve Of Soft Soil 51
3.4.2 Coefficient Of Consolidation Derived From Permeability Coefficient And Volume Compressibility Of Soft Soil 52
3.4.3 Consolidation Factor Derived From Bottom Pore Water Pressure And Time Curves 54
3.4.4 Analysis Of Factors Affecting Consolidation Coefficient 61
3.5 Determination Of Secondary Consolidation Coefficient Of Saw-Wood And Silt Mixed Soil By Laboratory Test 65
3.5.1 Influence Of Stress Level On Secondary Consolidation Coefficient Of Saw-Wood Silt Mixed Soil 72
3.5.2 Effect Of Stress History On Secondary Consolidation Coefficient Of Sapropelic Silt Mixed Soil 73
3.6 Determination Of Compression Coefficient Av, Compression Index Cc And Rebound Index Cs Of Rotten Wood And Silt Mixed Soil By Laboratory Test 74
3.6.1 Compression Factor Av 74
3.6.2 Compression Index Cc And Rebound Index Cs: 76
3.6.3 Relationship Between Coefficient Of Secondary Consolidation And Compression Index Of Rotten Wood And Silt Mixed Soil 81
3.7 Effects Of Particle Size And Organic Matter On Consolidation, Secondary Consolidation And Compression Properties Of Saprophytic Wood-Silt Mixed Soil 81
3.8 Comparison Of Basic Deformation Indexes Between Sapropelic And Silty Soil Mixed With Sapropelic Mud 88
Chapter 4 The Deformation Parameters Of Saprophytic Wood-Silt Mixed Soil Under Different Saprophytic Wood Contents Are Studied 92
4.1 Rotten Wood Composition Structure 92
4.2 Comparison Of Physical Properties Of Decayed Wood And Silt 93
4.3 Test Contents And Sample Preparation Method 95
4.3.1 Content 95
4.3.2 Sample Preparation 97
4.4 Effect Of Rotten Wood Content On Consolidation Characteristics 99
4.4.1 Comparison Of Consolidation Characteristics Between Decayed Wood And Silt 99
4.4.2 Consolidation Characteristics Of Saprophytic Wood-Silt Mixed Soil With Different Saprophytic Wood Contents 108
4.4.3 Summary 118
4.5 Variation Of Permeability Coefficient During Consolidation Of Rotten Wood And Silt Mixed Soil 120
4.6 Effect Of Rotten Wood Content On Compressibility 125
4.6.1 Comparison Of Compressive Properties Of Decayed Wood And Silt 125
4.6.2 Compressibility Of Saprophytic Wood-Silt Mixed Soil With Different Saprophytic Wood Contents 130
4.7 Effect Of Rotten Wood Content On Secondary Consolidation Characteristics 139
4.7.1 Mechanism Of Secondary Consolidation Of Silt And Rotten Wood 139
4.7.2 Test Content 142
4.7.3 Analysis Of Test Results 143
4.7.4 Deformation Characteristics And Classification Of Primary And Secondary Consolidation 145
4.7.5 Relationship Between Time And Secondary Consolidation Coefficient Of Saprophytic Wood-Silt Mixed Soil Under Different Saprophytic Wood Contents 147
4.7.6 The Relationship Between The Content Of Rotten Wood, The Coefficient Of Secondary Consolidation And The Consolidation Pressure 148
4.7.7 Relationship Between Coefficient Of Secondary Consolidation And Compression Index 150
4.7.8 The Relationship Between The Coefficient Of Secondary Consolidation And The Content Of Rotten Wood 152
Chapter 5 The Strength Characteristics Of Rotten Wood And Silt Mixed Soil Are Studied 154
5.1 Sample Preparation And Test Methods 154
5.2 Cu Test Results And Analysis 155
5.3 Cd Test Results And Analysis 162
Chapter 6 The Measured Settlement Data Of Rotten Wood And Silt Mixed Soil Soft Foundation Embankment Are Analyzedprediction Model Study 177
6.1 Settlement Prediction Of Graded Filling Embankment Based On Hyperbola Method 177
6.1.1 Factors Affecting Prediction Accuracy Of Hyperbola Method 178
6.1.2 Fitting Equation Of Hyperbolic Method For Settlement Prediction Of Graded Embankment 184
6.1.3 Variation Of Consolidation Coefficient During Consolidation Of Soft Soil 185
6.1.4 Determination Of Prediction Model Parameters 187
6.1.5 Case Studies 190
6.1.6 Summary 194
6.2 Settlement Rate Method For Determining The Unloading Time Of Overloading And Preloading Of Rotten Wood And Silt Mixed Soil Soft Foundation 195
6.2.1 Establishment Of Control Standard For Overloading Settlement Rate 196
6.2.2 Example Of Determining Unloading Time Under Overloading And Preloading 200
6.2.3 Summary 206
6.3 Summary Of This Chapter 207
Chapter 7 The Project Example Analysis And The Procedure Checking Computation 210
7.1 Engineering Geology Of Exposing Pufu Wood And Silt Mixed Soil 210
7.2 Analysis Of Settlement Observation Data Of Typical Section 212
7.3 Program Checking 217
7.3.1 Introduction To Constitutive Models In Plaxis 218
7.3.2 Plaxis Steps 220
7.3.3 Settlement And Stability Calculation Of Typical Sections 222
7.4 Calculation And Analysis Of Different Treatment Methods 230
7.4.1 Equal Load Preloading 232
7.4.2 Sand Well Combined With Equal Load Preloading Treatment 232
7.4.3 Sand Well Combined With Overload Preloading Treatment 233
7.5 Summary 235
Chapter 8 The Main Conclusions And Prospects 237
8.1 Main Conclusions 237
8.2 Outlook 240
References 241
Readership
This book should be useful for students, scientists, engineers and professionals working in the areas of optoelectronic packaging, photonic devices, semiconductor technology, materials science, polymer science, electrical and electronics engineering. This book could be used for one semester course on adhesives for photonics packaging designed for both undergraduate and graduate engineering students.
