Yu Zhao received his Ph.D. degree in Geotechnical Engineering from Chongqing University, China, in 2007. From 2010 to 2011, he studied as a visiting scholar at the Energy Geosciences Division of Lawrence Berkeley National Laboratory, America. In 2013, he was promoted to professor. Now, he is the dean of the College of Civil Engineering at Guizhou University. His research interests cover hydro-mechanical coupling in tunnel engineering and deep rock engineering. He has received six national or provincial scientific research projects and published more than 60 international and national papers. Yongfa Zhang received his Ph.D. degree in Civil Engineering from the School of Civil Engineering, Chongqing University, China, in 2022. From November 2021 to November 2022, he studied at GFZ German Research Centre for Geosciences (Helmholtz Centre Potsdam) as a visiting Ph.D. student. He obtained his bachelor's degree from China University of Mining and Technology in2016. His current research interest is to characterize rock’s hydraulic fracturing process and model hydraulic fracture behaviors. Pengfei He received his master’s degree in Geotechnical Engineering from Chongqing University, China, in 2018. He is now a geotechnical engineer, engaged in geotechnical engineering investigation and design.

• 1 Introduction.- Part I Laboratory observation.- 2 Rock mechanics in hydraulic fracturing operations.- Part II Laboratory observation.- 3 Reservoir characteristics.- 4 Constant flow injection.- 5 Constant pressure injection.- Part III Theoretical modeling considering Nonuniform fluid pressure.- 6 Fracture initiation.- 7 Fracture propagation.- 8 Fracture interaction behaviors.- Part IV Field implication.- 9 Formation of complex networks.- Epilogue.- References.

Yu Zhao received his Ph.D. degree in Geotechnical Engineering from Chongqing University, China, in 2007. From 2010 to 2011, he studied as a visiting scholar at the Energy Geosciences Division of Lawrence Berkeley National Laboratory, America. In 2013, he was promoted to professor. Now, he is the dean of the College of Civil Engineering at Guizhou University. His research interests cover hydro-mechanical coupling in tunnel engineering and deep rock engineering. He has received six national or provincial scientific research projects and published more than 60 international and national papers. Yongfa Zhang received his Ph.D. degree in Civil Engineering from the School of Civil Engineering, Chongqing University, China, in 2022. From November 2021 to November 2022, he studied at GFZ German Research Centre for Geosciences (Helmholtz Centre Potsdam) as a visiting Ph.D. student. He obtained his bachelor's degree from China University of Mining and Technology in2016. His current research interest is to characterize rock’s hydraulic fracturing process and model hydraulic fracture behaviors. Pengfei He received his master’s degree in Geotechnical Engineering from Chongqing University, China, in 2018. He is now a geotechnical engineer, engaged in geotechnical engineering investigation and design.

• 1 Introduction.- Part I Laboratory observation.- 2 Rock mechanics in hydraulic fracturing operations.- Part II Laboratory observation.- 3 Reservoir characteristics.- 4 Constant flow injection.- 5 Constant pressure injection.- Part III Theoretical modeling considering Nonuniform fluid pressure.- 6 Fracture initiation.- 7 Fracture propagation.- 8 Fracture interaction behaviors.- Part IV Field implication.- 9 Formation of complex networks.- Epilogue.- References.

Yu Zhao received his Ph.D. degree in Geotechnical Engineering from Chongqing University, China, in 2007. From 2010 to 2011, he studied as a visiting scholar at the Energy Geosciences Division of Lawrence Berkeley National Laboratory, America. In 2013, he was promoted to professor. Now, he is the dean of the College of Civil Engineering at Guizhou University. His research interests cover hydro-mechanical coupling in tunnel engineering and deep rock engineering. He has received six national or provincial scientific research projects and published more than 60 international and national papers. Yongfa Zhang received his Ph.D. degree in Civil Engineering from the School of Civil Engineering, Chongqing University, China, in 2022. From November 2021 to November 2022, he studied at GFZ German Research Centre for Geosciences (Helmholtz Centre Potsdam) as a visiting Ph.D. student. He obtained his bachelor's degree from China University of Mining and Technology in2016. His current research interest is to characterize rock’s hydraulic fracturing process and model hydraulic fracture behaviors. Pengfei He received his master’s degree in Geotechnical Engineering from Chongqing University, China, in 2018. He is now a geotechnical engineer, engaged in geotechnical engineering investigation and design.

• 1 Introduction.- Part I Laboratory observation.- 2 Rock mechanics in hydraulic fracturing operations.- Part II Laboratory observation.- 3 Reservoir characteristics.- 4 Constant flow injection.- 5 Constant pressure injection.- Part III Theoretical modeling considering Nonuniform fluid pressure.- 6 Fracture initiation.- 7 Fracture propagation.- 8 Fracture interaction behaviors.- Part IV Field implication.- 9 Formation of complex networks.- Epilogue.- References.