Jiangya dam and uplift of the mountain near the da -

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Jiangya Dam and near the dam deformation of mountain uplift

) And other measures mentioned in (1) a (4) four are analyzed. Monitoring data show that the uplift pressure values were low enough to cause significant uplift a large area,[link widoczny dla zalogowanych], so experts believe that Jiangya mountains near the dam dam and uplift in the specific geological structure and hydrogeological conditions, the formation of a particular phenomenon . The foundation rock and the surrounding mountain uplift is mainly due to reservoir impoundment, the dam water confined aquifer due to increased pressure head. After impoundment, the role of water in the library, the increase in aquifer pressure head of about 100m, led to gaps in the confined aquifer water pressure, effective stress is reduced, and cracks caused by expansion between layers of rock return combined effects of bombs, so that the foundation rock uplift. 5 uplift deformation on the impact of engineering safety impact of the project there are two aspects of safety concerns. 5.1 uplift deformation of the differences between uplift deformation include the following: (1) The dam blocks a greater difference between the uplift of the dam between the sealing block or part of the dam block cracking damage; (2) differences on both sides of the river bed and uplift the dam abutment contact with the joint opened; (3) differences in vertical and horizontal deformation Foundation Impervious Curtain. A large number of observations indicate that deformation of the riverbed dam foundation and abutment sides evenly transition dam is uplifted, the difference between adjacent small dam block uplift deformation; through the foundation uplift pressure and seepage observation data for both sides confirmed that a sound and effective foundation seepage curtain; static level of the dam, dam cracks Reversed observation and other observations are confirmed total dam works, to present these concerns were not there. 5.2 confined aquifer roof of the stability of the hot water pressure water aquifer and reservoir connectivity, it plays a watertight roof insulation role. Long-term effect in the reservoir water, the roof to withstand the equivalent of the role of the whole head, so the stability of roof safety of the project is very important. (1) roof impervious impermeable layer stability. Impermeable layer roof, including D3h, ~, rock group, the total thickness of 67.11-68.54m, as not all lava lava and difficult, no karst. Impermeable rock with good thick 42.17m, impermeable layers of medium thickness of 8.87m, relatively weak rock impermeable thick l7.93m, high compressive strength of saturated rock, the long-term immersion in water for no obvious softening process phenomenon. Impermeable layer of rock from the fractured statistics, water pressure test, indoor and experiment results indicate that the impermeability impermeability of damage stability is good. Problems in the lift after the axis of the dam downstream about two months of playing both sides of the ground temperature observation wells, the depth of the Ministry of impermeable layer into the middle in the end, observation results show that the bottom of the impermeable layer in the reservoir after the water temperature gradient and consistent exploration of the observations; from the hole laid osmometer observations that,[link widoczny dla zalogowanych], the bottom of the impermeable layer of fissure water pressure were very low level, indicating a good seal at the bottom impermeable layer,[link widoczny dla zalogowanych], water alternating weak and not conducive to the thermal convection proliferation. (2) Stability of roof rock deformation impermeable layer. Pressure hot water in the reservoir water aquifer after the springback deformation occurred, causing uplift of the overlying rock mass deformation, its essence is in the bottom of the impermeable layer produces an additional stress. In the additional stress field, the impermeable layer is to be cut, or cause excessive deflection of doubts and worries. The analysis of the bottom of the impermeable layer is no faults, joints fissure developed, the thickness and stability of the rock group; pressure hot water layer of pressure head downstream from the dam to the uniform gradient, confined water layer near the springback deformation uniform. Numerical results show that the uplift of rock mass is a small elastic deformation. The observations confirm the role of the normal high water level, the roof impermeable layer without damage to signs. November 2001 held in Beijing, \high water level. Although the two sides of the mountain and have some uplifting rock foundation, but the 120m elevation corridor based observations show that the biggest difference between the deformation of the adjacent dam only 1.81.9mm; dam deformation monitoring, dam monitoring and cross groundwater seepage observed no exception, foundation seepage curtain working; design units of deep anti-floating stability of the dam and review the results of sliding stability to meet the specifications. Therefore, the foundation rock and the uplift of the mountain sides without endangering the safety of dam,[link widoczny dla zalogowanych], reservoir to normal operation. Uplift deformation does not exceed the current stable, but is not expected to have a greater change, and repeated fluctuations in the reservoir water level to adjust the deformation, after a long time, and gradually stabilized. Uplift of the dam and the nearby mountains of the problem is a new topic, research and monitoring work is still continuing,[link widoczny dla zalogowanych], hope that the domestic relevant scholars, professors and colleagues who continue to give guidance and help. So that we do a better job.

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