36results about How to "Improve resistance to liquefaction" patented technology

The invention discloses a discrete pile-water permeability concrete pile novel binary composite foundation, which comprises concrete piles and water permeability concrete piles, wherein the concrete piles and the water permeability concrete piles are alternately arranged in rows, and the foundation surfaces of the upper parts of the concrete piles and the water permeability concrete piles are provided with broken stone hardcores. The invention also discloses a treatment method of the composite foundation. The composite foundation belongs to a binary foundation treatment mode integrating high bearing performance and high water discharge performance, the post-construction settlement of the foundation can be reduced, and in addition, the liquefaction resistance capability of the foundation can be effectively improved. In addition, during the concrete pile construction, hyperstatic pore water pressure can be generated in the foundation, the ground surface doming (cohesive soil layers) and the pile settlement (sandy soil layers) can be caused, and the occurrence of engineering harm can be prevented through reducing hyperstatic pore water pressure during the concrete pile construction via the arrangement of the water permeability concrete piles.

The invention provides a construction method of a pre-impregnated water dynamic compaction method for engineering foundations, comprising the following steps: step 1, determining the construction scope, and measuring the thickness of the sand filling; step 2, determining the location of the construction scope for laying a plastic drainage board and quantity, and determine the depth of the plastic drainage board; Step 3, lay out the plastic drainage board, and vibrate and drain the sand-filled foundation through a conventional vibrator; Spray water with a preset amount of water within the construction scope of the sand-filled foundation to maintain the preset moisture content, and then perform dynamic compaction through the pre-impregnated water compactor equipment. Spray on the ramming point at a fixed point to ensure no dust; Step 5, check the bearing capacity and liquefaction resistance of the foundation. The invention effectively solves the problems that the surface layer of the existing blowing and filling sand foundation is difficult to be compacted during the treatment process, which affects the construction quality of dynamic compaction and subsequent vibratory rolling, and pollutes the environment.

A microbial plate grouting device and method for strengthening liquefiable foundations, the device includes a grouting plate, a pipeline transfer device, an extension plate and a grouting pipe; steps of the grouting method: a. The microbial flat grouting device arranged in the form is vertically driven into the stratum to be reinforced; b. one end of the first and second grouting pipes are respectively docked with the first and second grout channels in the microbial flat grouting device, and the first injection The other end of the grouting pipe is connected with the valve, the grouting pump, and the urease-producing bacteria liquid storage tank in turn, and the other end of the second grouting pipe is connected with the valve, the grouting pump, and the cementing solution storage tank in turn; c. Open the valve Grouting the stratum with the grouting pump. During the grouting process, the microbial flat grouting device is evenly lifted up. After the grouting is completed, all the microbial flat grouting devices on the site are pulled out and left to stand for 12 hours. Finally, the groundwater is extracted for sewage treatment. Compared with the prior art, the invention simplifies the process, shortens the construction period and eliminates the problem of size effect.

The invention discloses a method for preventing earthquake liquefaction instable failure for superfine grain upstream method tailing damming. The burying depth of a first earthquake liquefaction preventing medium-coarse sand draining and seeping layer and the burying depth of a second earthquake liquefaction preventing medium-coarse sand draining and seeping layer are determined according to the earthquake fortification intensity of an earthquake of a region, wherein each of the first earthquake liquefaction preventing medium-coarse sand draining and seeping layer and the second earthquake liquefaction preventing medium-coarse sand draining and seeping layer is composed of a medium-coarse sand draining and seeping layer (11) and a row of slot draining and seeping pipes (3) laid in the medium-coarse sand draining and seeping layer (11), wherein the slot draining and seeping pipes (3) communicate with a water draining communication pipe (2) through a tee pipe (12), and the outer end of the water draining communication pipe (2) is connected with a dam abutment flood interception trench (1). By means of the method, the earthquake liquefaction preventing capability and stability of a superfine grain tailing fill dam are improved, the bearing force and the liquefaction preventing capability of superfine grain tailings are improved, earthquake liquefaction subsidence of a superfine grain tailing fill dam foundation is eliminated, the earthquake liquefaction instable failure phenomenon is avoided, and stability of the superfine grain tailing fill dam is improved.

The invention relates to a curing agent for treating a deep soft foundation soil layer and a preparation method thereof. The curing agent consists of metal oxides with activity of Al2O3, Fe2O3, CaO and MgO, nonmetal oxides with activity of SiO2 and SO3, and an acyclic sulfonate water-reducer. The preparation method for the curing agent comprises the following steps of: drying the metal oxides and the nonmetal oxides in a dryer, and heating at the temperature of between 750 and 850DEG C for 3 to 4 hours; grinding into granules that the residue of a 80 mu m square sifter is not more than 4.0 percent by using a ball mill; and adding the acyclic sulfonate water-reducer and uniformly stirring to obtain the curing agent for treating the deep soft foundation soil layer. The curing agent can make the unconfined compressive strength, deformation, permeability, liquefaction resistance and other properties of the treated soft foundation soil body obviously improved.