What are the aspects of geological consideration for the construction of tunnel?

Tunnel design, method of its excavation and stability are greatly influenced by following geological conditions: lithology, geological structures and ground water conditions. the strength and extent of lining and, thus the cost of the project.

Which geological consideration is suitable for tunneling?

Hard and Crystalline Rocks are the favourites with the tunnel engineers. These are excavated by using conventional rock blasting methods (RBM) and also by tunnel boring machines (TBM) of suitable strength.

What are the parameters of RMR system?

Classification table

RMR	Rock quality
0 – 20	Very Poor
21 – 40	Poor
41 – 60	Fair
61 – 80	Good

What information do we need in site selection for tunnels?

The terrain of target areas, mechanical properties of geologic materials, and excavation gradient of slopes surrounding the portal, and the orientation of the portal of the tunnel are also taken into consideration by this method.

What are the geological considerations involved in the construction of building?

In particular, the influence of geology on cut slope stability, soft and hard ground excavation (including tunnelling), bearing capacity, settlement, subsidence and the choice of foundation type are all considered. Particular problems associated with the use of fills and waste materials are also mentioned.

What are geological considerations?

Among geological considerations, lithology, weathering, rock quality, rock structures, ground water, engineering properties of rock, rock cover, and pillar width are briefly discussed. Specific behaviors include rock loosening, squeezing, swelling, decomposition of material, piping, and surface deterioration.

What are geological considerations involved in the construction of buildings?

What are the six parameters to determine the rock quality by estimating?

The following six parameters are determined for each structural unit: Uniaxial compressive strength (UCS) of intact rock material, rock quality designation (RQD), joint or discontinuity spacing, joint condition, groundwater condition, and joint orientation.

What is Q-system and describe its all parameters?

The Q-system is developed to classify rock masses around an underground opening, as well as for field mapping. Based on estimation of six rock mass parameters, a Q-value for a rock mass can be calculated. This value gives a description of the rock mass quality. The Q-value in an undisturbed rock mass may be different.

What geological considerations are to be made for selecting a dam and tunnel site?

Following are the factors affecting selection of dam site by dam type.

• Topography.
• Geology and Foundation Conditions.
• Availability of materials.
• Spillway size and location.
• Earthquake zone.
• Height of the Dam.
• Other factors such as cost of construction and maintenance, life of dam, aesthetics etc.

What are the geological considerations for successful reservoir?

The various considerations are, the strength of the rock which should be adequate to carry the load of the dam without getting crushed or sheared, structural features like dip of strata, spacing of bedding planes, presence of folds, faults, joints and zones of crushed rock and the permeability of the rocks and the type …