The present invention discloses a method for constructing inner dump type strip mine pit bottom reservoirs section by section, specifically including the following steps: S1: processing end slopes: discarding clay at a lowest step of an inner waste dump of a strip mine; S2: discharging concrete to slope faces of lowest steps of the end slopes on two sides of a pit bottom; S3: sealing the bottom; S4: discarding gravel into a pit of the strip mine; S5: laying geotextile; S6: re-adopting clay on the lowest steps of the end slopes of the inner waste dump, so as to form a reservoir sealing isolation layer; S7: constructing a plurality of reservoirs step by step in an advancing direction of the strip mine; S8: storing water resources: completing installation of water storage wells; S9: completing installation of water fetching wells; S10: storing water resources.

The present invention discloses a method for constructing inner dump type strip mine pit bottom reservoirs section by section, specifically including the following steps: S1: processing end slopes: discarding clay at a lowest step of an inner waste dump of a strip mine; S2: discharging concrete to slope faces of lowest steps of the end slopes on two sides of a pit bottom; S3: sealing the bottom; S4: discarding gravel into a pit of the strip mine; S5: laying geotextile; S6: re-adopting clay on the lowest steps of the end slopes of the inner waste dump, so as to form a reservoir sealing isolation layer; S7: constructing a plurality of reservoirs step by step in an advancing direction of the strip mine; S8: storing water resources: completing installation of water storage wells; S9: completing installation of water fetching wells; S10: storing water resources.

A high strength environmental control device comprising a mesh container having at least one interior and one exterior surface is provided. The interior of the mesh container can comprise a filler material. The mesh container can comprise a plurality of yarns, including viscose fibers, interlaced together.

The present invention provides methods for mineral precipitation of porous particulate starting materials using isolated urease.

The present invention provides methods for mineral precipitation of porous particulate starting materials using isolated urease.

The present invention provides methods for mineral precipitation of porous particulate starting materials using isolated urease.

Methods including providing a hydrajetting tool comprising a housing having a top end and a bottom end and having a plurality of jetting nozzles disposed thereon, the top end of the housing fluidly coupled to a tool string; providing at least one sub-soil-surface cavity adjacent to or in unstable soil, the unstable soil having a plurality of channels therein; introducing the hydrajetting tool into the at least one sub-soil-surface cavity; injecting a cement slurry through at least one of the jetting nozzles and into the sub-soil-surface cavity; permeating the cement slurry into the plurality of channels in the unstable soil; filling the at least one sub-soil-surface cavity with the cement slurry; and curing the cement slurry, thereby forming a stable soil and a cement pillar in the at least one sub-soil-surface cavity.

A method for determining breakthrough time of anti-seepage liners in a landfill, includes (a) detecting a leachate sample of the landfill to determine the initial concentration C.sub.0 of pollutants, and monitoring the leachate head h of the landfill; (b) determining the pollution-causing concentration C.sub.A of the pollutants according to functional orientation of local groundwater of the landfill; (c) determining, related parameters of the anti-seepage liners including the thickness z of the anti-seepage liners, the permeability coefficient k of the liners, and the porosity n of the material of the liners, and determining the related parameters of pollutant migration including the effective diffusion coefficient D.sub.a* and the mechanical dispersion coefficient D.sub.m of the pollutants in the anti-seepage liners, and the adsorption retardation factor R.sub.d of the anti-seepage liners on the pollutants; and (d) calculating the breakthrough time t of the anti-seepage liners according to a formula,

[00001]$t=\frac{{\mathrm{nR}}_d.Math.z^2}{\left(h+z\right).Math.k}.Math.\left(\left({a?\left(\frac{C_0}{C_A}\right)}^b\right).Math.\ln ?\left(\frac{\left(h+z\right).Math.k}{n?\left(D_a^{*}+D_m\right)}\right)+c\right).$

A process for reclaiming soft tailings comprising capping a soft tailings deposit with at least one capping material to form a trafficable surface atop the soft tailings is provided, wherein the capping material comprises water, coarse tailings, sand, petroleum coke, clay-shale overburden, glacial (PG)/Glacio-lacustrine (PL) deposits, geosynthetics or combinations thereof.

A high strength environmental control device comprising a mesh container having at least one interior and one exterior surface is provided. The interior of the mesh container can comprise a filler material. The mesh container can comprise a plurality of yarns, including viscose fibers, interlaced together.