Support device and method used for soil heaping and backfilling of engineering construction
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A supporting device and building technology, applied in the field of backfill soil support, can solve the problems of easy formation of landslides, disasters, serious land subsidence of the site, etc., and achieve the effects of improving stability and resource utilization.
Inactive Publication Date: 2017-02-01
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology
If the backfill soil is not reinforced during the stacking process, after a short period of use, due to the recent consolidation of the self-weight of the fill soil and the impact of ground pressure and water seepage, the ground subsidence of the site is serious, especially in heavy rain weather, it is very easy to form landslides , resulting in major accidents
For example, in a certain place in Guangzhou, backfill soil for construction began to be piled up in 2000, but around 2005, with the gradual increase in the area and height of the piled soil, it caused greater pressure on the ground until December 2015 when rainwater, ground Under the action of various factors such as pressure, landslides formed by large-scale artificial piles of soil occurred, causing very huge disasters
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Embodiment 1
[0040] The maximum covering depth of the backfill is H=24m, the height of the concrete retaining beam is h=1.2m, the length of the concrete retaining beam is 3m, and the thickness is 0.5m, and reinforcement is set on the concrete retaining beam. The physical and mechanical property indexes of the known soil slope backfill are as follows: internal friction angle φ = 25°, cohesion c = 12kPa, weight γ = 19kN / m 3 .
[0041] Since no prestress is applied to the anchor cables in the design, the concrete retaining beam bears active earth pressure.
[0042] Then the active earth pressure coefficient Ka is: Ka=tan 2 (45°-φ / 2)=tan 2 (45°-25° / 2) = 0.41
[0043] Then the active soil pressure at the top of the concrete retaining beam is:
[0044] The active soil pressure at the bottom end of the concrete retaining beam is:
[0045] Therefore, the active earth pressure acting on the concrete retaining beam: the active earth pressure acting on the concrete retaining beam is: Ea=...
Embodiment 2
[0053] The maximum covering depth of the backfill is H=16m, and the height of the concrete retaining beam is h=1.2m. The physical and mechanical property indexes of the known soil slope backfill are as follows: internal friction angle φ = 25°, cohesion c = 12kPa, weight γ = 19kN / m 3 .
[0054] Since no prestress is applied to the anchor cables in the design, the concrete retaining beam bears active earth pressure.
[0055] Then the active earth pressure coefficient Ka is: Ka=tan 2 (45°-φ / 2)=tan 2 (45°-25° / 2) = 0.41
[0056] Then the active soil pressure at the top of the concrete retaining beam is:
[0057] The active soil pressure at the bottom end of the concrete retaining beam is:
[0058] Therefore, the active earth pressure acting on the concrete retaining beam: the active earth pressure acting on the concrete retaining beam is: Ea=1 / 2(σ aa +σ ab )×h=1 / 2(105.05+114.40)×1.2=131.67kN / m, and its action point is at the geometric centroid of the backfill.
[00...
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Abstract
The invention discloses a support device and method used for soil heaping and backfilling of engineering construction. Backfilling soil can be heaped in multiple layers through the support device according to the terrain of a backfilling soil heaping position, the operation is repeated till backfilling soil is heaped completely, and a three-dimensional heaping network capable of yielding is formed by all concrete blocking beams and anchor cables; when the heaped backfilling soil is backfilled, the corresponding anchor cables at the upper ends of the uppermost concrete blocking beams are taken down, and the operation is repeated till backfilling soil operation is completed; and all the concrete blocking beams and the anchor cables are removed for standby application. The horizontal displacement of upper soil reinforced through the support device and method is much smaller than the displacement of soil which is directly backfilled without reinforcement, the maximum horizontal displacement occurs at top slope corners of backfilled soil, and settlement deformation is relatively small; and yielding springs are distributed at yielding positions and matched with connecting springs between the concrete blocking beams so that the three-dimensional heaping network can be formed, and adaptive coordination deformation according to the soil heaping heights and soil heaping terrains can be achieved.
Description
technical field [0001] The invention relates to the support field of backfill soil, in particular to a support device and method for piled soil and backfill of engineering buildings. Background technique [0002] In modern construction, deep foundation pits or basement excavations are becoming more and more common and used for more and more purposes. In the current construction industry, the construction period is getting shorter and shorter, the foundation pit is getting deeper and deeper, and the amount of soil that needs to be stacked and backfilled is getting larger and larger, while the space for the pile of soil is getting smaller and the height of the pile of soil is getting higher and higher. . As for the stacking of backfill, natural stacking is generally adopted, or measures such as setting up simple protective nets are adopted. If the backfill soil is not reinforced during the stacking process, after a short period of use, due to the recent consolidation of the ...
Claims
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Application Information
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