A method for measuring the amount of subsidence at the bottom of a saline soil road cutting bed
A saline soil and road cutting technology, applied in the direction of geometric CAD, special data processing applications, etc., can solve the problems of failure to consider the influence of saline soil road cutting excavation and unloading, foundation self-weight stress, road cutting replacement load, etc., and achieve the calculation method Convenience, less calculation parameters, clear process effect
Active Publication Date: 2022-07-29
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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Problems solved by technology
[0005] The above calculation formula is based on the dissolution coefficient to determine the amount of subsidence of the saline soil foundation. However, when constructing road cuttings in saline soil areas, the technical deficiency is that the excavation and unloading of saline soil cuttings and the self-weight stress of the foundation cannot be taken into account. and the influence of cutting displacement load
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[0037] refer to figure 1 , a high-speed railway builds a cutting bed in the saline soil D area, the cutting depth is 6.8m (the depth from the surface of the subgrade center to the bottom of the subgrade), the slope ratio is 1:1.75, and the width of the top surface of the subgrade is 13.4m , the thickness of the base bed surface layer 1 is 0.4m, and the thickness of the base bed bottom layer 2 is 1.9m. The saline soil D at the bottom of the cutting bed will collapse and deform during the process of immersion and filtration.
[0038] The method of the present invention is adopted below to determine the amount of subsidence that occurs at the bottom of the saline soil road cutting bed in the process of immersion and leaching (the position is the center of the roadbed), and the concrete steps are as follows:
[0039] (1) Through on-site investigation or data inquiry, determine the impact depth l of water immersion and subsidence below the top surface of the saline soil road cutti...
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The invention discloses a method for measuring the subsidence of the bottom of a saline soil road cutting bed, which can scientifically and reasonably determine the subsidence of the bottom of a saline soil road cutting bed under flooding conditions, and can meet actual engineering needs. Including the following steps: determine the depth l of the subsidence affected by water immersion below the top surface of the saline soil road cutting bed 0 , calculate and determine the calculated thickness h of the subsidence deformation at the bottom of the saline soil road cutting bed 0 ; Determine the subsidence index C of the i-th layer of soil by collecting saline soil samples on site and carrying out load-bearing subsidence test, compression test, moisture content test, soil particle specific gravity test and severe test in the room. ri and other parameters; the subsidence amount s at the bottom of the saline soil road cutting bed is determined by the following formula r :
Description
technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for measuring the subsidence of the bottom of a saline soil road cutting bed. technical background [0002] The subsidence and subsidence deformation of the saline soil foundation occurs under the condition of water immersion, which can easily affect the normal use function of the high-speed ballastless railway or the maglev roadbed. At present, the amount of subsidence of saline soil foundation is mostly determined by the "Code for Buildings in Saline Soil Areas" (SY / T0317-2012), that is, the amount of subsidence is determined according to the following formula: [0003] [0004] In the formula, S δ0 is the total subsidence of the saline soil foundation, in mm; δ i is the subsidence coefficient of the i-th layer of soil; H i is the thickness of the i-th layer of soil, in mm; n is the number of layers of all subsidence saline soil below the bottom ...
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IPC IPC(8): G06F30/13
CPCG06F30/13
Inventor 陈伟志李安洪郭在旭姚裕春吴沛沛胡会星张耀龚建辉张莎莎向俐蓉薛海洋周川滨贾坤朱曦
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD