PrefaceIn order to meet the needs of the development of society and the times，this book is based on the undergraduate specialty construction and certification standards proposed by the National Civil Engineering Professional Steering Committee of Colleges and Universities，incorporating relevant provisions of the latest national codes and industry standards.This book systematically introduces the basic principles and analysis and calculation methods of soil mechanics adopted the latest norms and regulations of home and related industries.Focusing on the professional knowledge and operational skills required by students for employment，this book focuses on the contents required for the cultivation of innovative applied talents，highlighting practicality and operability.Soil mechanics is a highly theoretical and practical course.This book fully emphasizes the integration of theory with practice，explains the knowledge points with simple and understandable words combined with pictures and examples，and follows the teaching rules of the course.Through the systematic arrangement of related knowledge，it guides students to enter the professional field as soon as possible.Through the knowledge objectives set in each chapter，supplemented by more exercises，students can have a deeper understanding of the basic concepts，principles，methods and comprehensive application of this book，so that students can consolidate and strengthen the learning achievements of this course.At the end of the book，necessary references are listed for teachers to refer to when preparing lessons，and also for students who want to study in depth.This book is written by Jia Caihong of Nanjing Institute of Engineering in Chapter 2，Chapter 3，Chapter 4 and Chapter 5，Liu Shaobo of Nanjing Institute of Engineering in Chapter 6，Chapter 7 and Chapter 8，and Wang Feng of Nanjing Fire Engineering Co.，Ltd.in the introduction and chapter 1.The whole book was compiled by Jia Caihong.Due to the knowledge level and ability of the editor，there are inevitably omissions and inadequacies in the book，We urge the readers to criticize and correct.Editor2023.1