The invention relates to a device for soft soil foundation treatment by vacuum-membrane-free vacuum preloading and a treatment method. The device comprises includes several top plates for being laid on the surface of soft soil foundation and several vertical plates for being vertically driven into the soft soil foundation, wherein the vertical plates are driven against the symmetrical side edges of the top plates; the vertical plate has an inner chamber, the top surface of the vertical plate is provided with a vertical plate main-hole in communication with the inner chamber of the vertical plate, both sides of the vertical plate are provided with several vertical plate vacuum mini-holes in communication with the inner chamber of the vertical plate; the vertical plate main-hole is in communication with vacuum equipment. The invention is applicable to applicable to the field of geotechnical engineering techniques.

The invention relates to a device for soft soil foundation treatment by vacuum-membrane-free vacuum preloading and a treatment method. The device comprises includes several top plates for being laid on the surface of soft soil foundation and several vertical plates for being vertically driven into the soft soil foundation, wherein the vertical plates are driven against the symmetrical side edges of the top plates; the vertical plate has an inner chamber, the top surface of the vertical plate is provided with a vertical plate main-hole in communication with the inner chamber of the vertical plate, both sides of the vertical plate are provided with several vertical plate vacuum mini-holes in communication with the inner chamber of the vertical plate; the vertical plate main-hole is in communication with vacuum equipment. The invention is applicable to applicable to the field of geotechnical engineering techniques.

An apparatus intended for incorporation as a module within ground improvement pokers such as those already patented (U.S. Pat. Nos. 6,554,543 and 8,419,316) in order to enhance the field performance of those hydrodynamic compactors by either improving their ground penetration capability, and/or, maintaining or recovering the permeability of their outer seepage filtration element; involving a method which can be activated remotely at the operator's discretion, while those parent devices are at depth within the earth. This apparatus and method may have application in water well installations and reviving flow in oil wells.

An apparatus intended for incorporation as a module within ground improvement pokers such as those already patented (U.S. Pat. Nos. 6,554,543 and 8,419,316) in order to enhance the field performance of those hydrodynamic compactors by either improving their ground penetration capability, and/or, maintaining or recovering the permeability of their outer seepage filtration element; involving a method which can be activated remotely at the operator's discretion, while those parent devices are at depth within the earth. This apparatus and method may have application in water well installations and reviving flow in oil wells.

Disclosed is a comprehensive excavation process performed on an excavation site. The process includes installing wellpoints for lowering the groundwater level within the excavation site and stabilizing the boundary soil walls of the excavation site by an improved soil nailing method. The improved soil nailing method employs casing pipes that are part of the wellpoint system as reinforcing elements for the stabilization of the soil walls.

Disclosed in the present invention is a drainage pressure relief anti-floating system suitable for a weakly permeable soft stratum. The drainage pressure relief anti-floating system comprises a pressure relief well body and an artificial hydrophobic layer, wherein longitudinal bars are arranged in stand columns of a sand-free concrete well wall, and are anchored into concealed beams. The pressure relief well body is located in the artificial hydrophobic layer, a construction surface of the artificial hydrophobic layer is located on the weakly permeable soft stratum, a wicker fence layer is laid on the weakly permeable soft stratum, a biaxially stretched plastic geogrid is laid on the wicker fence layer, a medium coarse sand layer is laid on the biaxially stretched plastic geogrid, and a crushed stone layer is laid on the medium coarse sand layer.

A method for reinforcing soft ground by post-grouting combined with pressurized vacuum preloading is proposed, by pre-burying prefabricated vertical drains and air-boosted pipes in granular material piles, and the air-boosted pipes are used as grouting pipes to reduce the number of times of piling, which not only improves the construction efficiency, but also reduces the structural disturbance of the soil and the influence of smear effect, thus reducing the impact on the radial permeability and the radial consolidation coefficients. The method does not use geotextile bags for granular materials, which can avoid the problem of forming a localized clogging area around the geotextile bags, and the method not only improves the efficiency of vacuum transfer in a pre-consolidation stage, but also improves the grouting effect in the later stage, effectively enhances the strength of soft soil and makes granular material piles and the surrounding soil form composite ground.

The invention relates to a machine for putting a drain into place in ground, machine comprising: a drive tube presenting a longitudinal axis and having a bottom end; a movement device for moving the drive tube in a direction parallel to the longitudinal axis; a drain extending inside the drive tube and having a bottom end extending outside the drive tube; at least one anchor; a fastener device (70) for fastening the anchor to the drain; and a cutter member for cutting the drain (18) and arranged under the fastener device.

The machine of the invention further comprises a cutter device (60) for cutting the anchor from a strip (54).

In a Regenerative Stormwater Conveyance (RSC) system, rather than increase base flow by putting a horizontal layer of clay and silts in the entire streambed, constructing vertical irrigation curtains with clay rich soil to interrupt the groundwater flow at certain intervals will increase surface water base flows and improve habitat and water quality while also improving the interactions between the hyporheic zones and the channel. Also, by initially providing a subsurface flow channel through which water can flow, for example, using a perforated pipe, and building an access road over that channel during construction, erosion in the RSC project area can be significantly reduced or eliminated.

An apparatus intended for incorporation as a module within ground improvement pokers such as those already patented (U.S. Pat. No. 6,554,543 and U.S. Pat. No. 8,419,316) in order to enhance the field performance of those hydrodynamic compactors by either improving their ground penetration capability, and/or, maintaining or recovering the permeability of their outer seepage filtration element; involving a method which can be activated remotely at the operator's discretion, while those parent devices are at depth within the earth. This apparatus and method may have application in water well installations and reviving flow in oil wells.