Complex geological environment and engineering effect in the deep

This part focuses on the applied fundamental research of formation and evolution of special engineering geological environment in deep rock and soil, the structure and material composition of the rock and soil in the deep environment, the detailed detection and evaluation of the geological environment of deep underground engineering, temperature field of deep rock mass and the formation mechanism of thermal damage as well as the interaction and restriction law between underground engineering construction and geological environment, etc.

Main research contents are listed as follows.

(1) The initial stress field, geothermal field, occurrence of groundwater (gas), migration law and interaction property which affects mechanical properties of deep rock and soil and stability of underground engineering; deep underground engineering response under geological structure and hydrogeological anomaly; the coupling mechanism of deep stratum thermalphysics characteristics and three phases (solid phase, liquid phase and gas phase); prevention of deep geothermal disasters and the comprehensive utilization;

(2) To adopt comprehensive integration method and information technology of engineering geology and mechanics to carry out 3D visual modeling, and accurately detect geological structures of deep rock and soil; to study the stratigraphic structure and lithologic changes from the plane and three-dimensional perspective;

(3) Theories and methods of propagation of seismic waves and electromagnetic waves in deep fractured rock and soil; the stress field law in fractured and tectonic rock mass and the theories and methods of seismic and electrical exploration; theories and methods for the development of fissures and joints in deep rock and soil and the determination of their orientations;

(4) Direct and indirect testing techniques and means such as scanning electron microscopy, X-ray, CT, acoustic emission, etc. were used to study the micro-mechanism of rock and soil fracture and failure under the complex geological environment in deep underground and its relationship with the macroscopic behavior characteristics.