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Stability and pore pressure control technology for loess-substrate waste dump
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A control technology and technology for dumping sites, applied in the fields of soil protection, infrastructure engineering, construction, etc., can solve the problems of quantification difficulties and poor technical pertinence, and achieve the effect of improving the mechanical strength of soil
Active Publication Date: 2011-06-15
CCTEG SHENYANG RES INST
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[0003] In order to overcome the problem that the existing loess basement dump site stability control technology is not highly targeted or difficult to quantify, the present invention provides a loess base dump site stability pore pressure control technology
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Embodiment 1
[0021] Embodiment one, see figure 1 , figure 2 , Table 1, Table 2, a stability pore pressure control technology for loess basement dumps. There is an aquifer on the loess basement of the loess dump. Under rainfall or other recharge conditions, the saturated water-bearing loess basement forms on the aquifer. The evolutionary weak layer 11 constitutes the potential slope sliding surface 14. The possible location of the sliding surface is determined according to the geological exploration results. For the selected section, the pore pressure u is obtained by fitting according to the soil mechanicslaboratory test and the on-site water pressure meter monitoring of the dump site.
[0022] u=Ce Dt
[0023] In the above formula: u——pore pressure, kPa;
[0024] t——pore pressure dissipation time, min;
[0025] C——related parameters of pore pressure dissipation;
[0026] D——related parameters of pore pressure dissipation.
[0078] Embodiment two, see appendix figure 1 , figure 2 , the theory and formula in Table 1, Table 2 and Example 1, when h=138m, [σ] T =153.764kPa, a=240m, τ 0 =66.835kPa,D c =97.73%, α=7°, β=34°, τ 土 = 192.205kPa, W = 64836.8kN, considerably increased the amount of soil displacement. Ask for K d formula calculation
[0080] K d =0.975<1, the soil discharge step of this section stops soil dischar...
Embodiment 3
[0086] Embodiment three, see appendix figure 1 , figure 2 , the theory and formula in Table 1, Table 2 and Example 1, when h=138m, [σ] T =153.764kPa, a=240m, τ 0 =66.835kPa,D c = 43.07%, corresponding to an increase in pore pressure, α = 7°, β = 34°, τ 土 =192.205kPa, W=54880kN, use K d formula calculation
[0088] K d =0.992<1, adopt the same control measures as in Embodiment 2. The specific conten...
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Abstract
The invention relates to a stability and pore pressure control technology for a loess-substrate waste dump. A loess substrate of a waste dump is provided with a water insulating layer; a saturated aqueous loess substrate on the water insulating layer forms an evolution weak layer to constitute a potential slope sliding surface under the condition of rainfall or other replenishment; and the sliding surface is confirmed according to a geological exploration result. The stability and pore pressure control technology is characterized in that by aiming at a selected profile, the pore pressure u which is equal to CeDt is solved by fitting according to soil mechanics indoor test and field hydraulic gage monitoring in the waste dump, and pore pressure dissipating time t is equal to D01nu+C0; a dynamic stability coefficient Kd is confirmed for decisions on waste disposal or waste disposal control; a quantitative analysis method is provided for the stability control technology for the loess-substrate waste dump so as to realize waste disposalengineering advancing by areas, waste disposal strength control and pore water pressure and slope displacement monitoring; a pore water pressure control method is used to ensure that the waste dump is stable and the waste disposal capacity and the waste disposal strength of the waste dump is improved to the greatest extent at the same time; and the stability and pore pressure control technology is suitable for a design phase and a construction or use phase of a loess-substrate waste dump with the evolution weak layer.
Description
technical field [0001] The invention relates to a technology for controlling the stability of an open-pit mine dump, in particular to a technology for controlling the stability of a loess-based dump, in particular to a technology for controlling the stability of a pore pressure in a loess-based dump. Background technique [0002] Regarding the stability control technology of loess basement dumps, there are currently technical reports on the simulation analysis and evaluation of slope stability using finite element numerical simulation methods and limit equilibrium methods. At the same time, as early as 1995, "Geological Review" 1995, 41(6). 571-576, published the paper "The Microstructure Evolution of the BasementLoess of the Antaibao Open-pit Coal Mine Dump and the Formation Mechanism of the Weak Layer", among which According to the research on the clay mineral composition and microstructure of loess at the base of the dump site and its microstructure change under graded l...
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