The Method of Using Saturated Brine Clay Slurry to Strengthen the Subgrade of Salt Lake Railway
A technology of railway subgrade and clay slurry, which is applied to roads, roads, buildings, etc. It can solve the problems of not being easy to solidify, and cannot block the seepage of low salinity brine, so as to prevent the seepage of brine and ensure the safety of driving
Active Publication Date: 2016-05-18
NORTHWEST RES INST CO LTD OF C R E C
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However, cement and lime are not easy to solidify in brine. Even if they are not in good contact with the salt rock surface after solidification, the confined water will still infiltrate; the salt slag clay slurry can fill the gaps in salt rock, and it cannot seal low-salinity brine infiltration
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[0017] Taking the cracks and subsidence on the left side of the railway subgrade slope of the Qinghai-Tibet line K751+650~K752+450 section as an example, the method and effect of the present invention for strengthening the salt lake railway subgrade with saturated brine clay slurry will be described in detail.
[0018] For the cracks and subsidence of the left subgrade slope of the K751+650~K752+450 section of the Qinghai-Tibet Line, the main principle of prevention and control is to fill the infiltration channel of low-salinity brine with the purpose of filling the gap. The specific content includes:
[0019] ① Grouting material: It is made by mixing saturated brine and clay, and the specific gravity of the slurry is controlled at 1.7-1.9g / cm 3 ;
[0020] ② Arrangement of grouting holes: One row is set at the shoulder of the railway subgrade, two rows of grouting holes are set at the slope toe and 2m inward from the outside of the berm, and the two rows of grouting holes are...
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The invention provides a method for reinforcing a railroad bed of a salt lake by using saturated brine clay slurry, wherein a brine upward percolation channel with low degree of mineralization is filled by a grouting manner. The method specifically comprises the following steps: arranging a row of grouting holes in the shoulder of the railroad bed; respectively arranging two rows of grouting holes in positions which are 2cm away from the outsides of a slope toe and a berm, wherein the two rows of grouting holes are arranged in a staggered manner in quincunx shape, the interval between the every two grouting holes is 0.8-1.0m, and the distance between two rows is 0.5-0.6m; by taking the brine clay slurry as a grouting material, controlling the grouting pressure at 1.5-2.0MPa; grouting every other one hole; and when slurry is overflowed from the wall of a single hole, stopping grouting. According to the method provided by the invention, the brine clay slurry is adopted to grout, clay is quickly condensed in brine to fill the Karst caves of the salt lake bed, and clay is well contacted with rock salt surfaces to seal gaps of clay layers of the rock salt, so that brine with low degree of mineralization can percolate upwards so as to further reinforce the railroad bed of the salt lake, so that guarantee is provided for traffic safety of railways along the salt lake.
Description
technical field [0001] The invention belongs to the technical field of strengthening salt lake foundations, and relates to a method for strengthening the salt lake railway roadbed by grouting, in particular to a method for reinforcing the salt lake railway roadbed by using saturated brine clay slurry. Background technique [0002] The ~K752+680 section passes through the Chaerhan Salt Lake. The railway in the Salt Lake area directly uses the salt rock formation saturated with brine as the subgrade base, which is more than 30 kilometers long. The Qinghai-Tibet Railway passes through the northern saline area of the Chaerhan Salt Lake. Salt is widely distributed. There are 2.7km of subgrade bases distributed with salt. The main forms are two basic types: karst caves and karst ponds. The formation of caves is mainly the result of low-salinity confined water seeping into the bottom of the salt rock layer and causing dissolution. When the karst cave runs through the entire salt...
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IPC IPC(8): E01C3/04
Inventor 李勇吴丽华董建华董添春党海明唐彬杰
Owner NORTHWEST RES INST CO LTD OF C R E C