An in-situ reconstruction and extension structure of an embankment and a construction method thereof are provided. The structure includes a stepped slope excavated on an existing side slope. A gradient of the stepped slope is the same as that of an extension side slope, the stepped slope is individually intersected with top and bottom planes of existing side slope; a toe of existing side slope is taken as a toe of the extension side slope, and gradient of the extension side slope is determined according to positions of the toe and an expanded width. An outer side of stepped slope is filled with a geogrid reinforcement layer in a layered manner, a slope protection structure is arranged on an outer side of the geogrid reinforcement layer to form extension equivalent side slope; a drainage system is arranged at a bottom of the extension side slope.

The invention relates to a MSW (municipal solid waste) landfill barrier system capable of prolonging breakthrough time of leachate and a manufacturing method thereof. The system comprises a leachate collection and removal layer, a first HDPE (high-density polyethylene) geomembrane infiltration proof layer (2), a clay liner (5) and a groundwater collection and removal layer (6) which are sequentially stacked from top to bottom. The clay liner (5) is composed of a lower clay liner (51), a middle clay liner (52) and an upper clay liner (53) which are sequentially arranged, wherein the middle clay liner (52) is filled with a medium-fine sand layer (7) laid with sands of particle sizes ranging from 0.1 mm to 0.5 mm and of water content 3%, wherein the saturated hydraulic conductivity of the medium-fine sand layer (7) varies from 110.sup.5 to 110.sup.3. A method of manufacturing the MSW landfill barrier system capable of prolonging breakthrough time of leachate is also provided.

The invention relates to a MSW landfill barrier system capable of prolonging breakthrough time of leachate and a manufacturing method thereof. The system comprises a leachate collection and removal layer, a first HDPE (high-density polyethylene) geomembrane infiltration proof layer (2), a clay liner (5) and a groundwater collection and removal layer (6) which are sequentially stacked from top to bottom. The clay liner (5) is composed of a lower clay liner (51), a middle clay liner (52) and an upper clay liner (53) which are sequentially arranged, wherein the middle clay liner (52) is filled with a medium-fine sand layer (7) laid with sands of particle sizes ranging from 0.1 mm to 0.5 mm and of water content 3%, wherein the saturated hydraulic conductivity of the medium-fine sand layer (7) varies from 110.sup.5 to 110.sup.3. A method of manufacturing the MSW landfill barrier system capable of prolonging breakthrough time of leachate is also provided.

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.

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 the injection of injection material for the uplift of a surface area. The method includes selecting a target subterranean depth/stratum for depositing the injection material and preparing a wellbore extending from the ground surface to the target subterranean depth/stratum via utilization of a drill string. A directional drill is used for creating a horizontal wellbore, wherein a lifting routine is performed upon detection of the position of the directional drill. The lifting routine includes injecting a slurry comprising materials suspended in a carrier liquid into the injection well, lifting the surface area to a target lift elevation by depositing the injection material to the subterranean depth/stratum, resulting in an uplifting force, and measuring the rise in elevation of the surface area via surface indicators. The method achieves precise and non-disruptive elevation modification of surface areas to target levels.

An in-situ reconstruction and extension structure of an embankment and a construction method thereof are provided. The structure includes a stepped slope excavated on an existing side slope. A gradient of the stepped slope is the same as that of an extension side slope, the stepped slope is individually intersected with top and bottom planes of existing side slope; a toe of existing side slope is taken as a toe of the extension side slope, and gradient of the extension side slope is determined according to positions of the toe and an expanded width. An outer side of stepped slope is filled with a geogrid reinforcement layer in a layered manner, a slope protection structure is arranged on an outer side of the geogrid reinforcement layer to form extension equivalent side slope; a drainage system is arranged at a bottom of the extension side slope.

A device for 3D or 4D printing of reinforced foundations in geotechnical engineering comprises a driving system (50) for positioning of the production unit (7) in a three dimensional space (x, y, z) on a construction site (1). The production unit (7) comprises a first production assembly (20) and a second production assembly (30), wherein the first production assembly (20) and the second production assembly (30) are designed to operate with different construction materials, wherein one of said construction materials is a reinforcement construction material for reinforcing the foundations to be created during operation of the device.