CN111241702A - Stability calculation method for slope soft soil foundation filling project - Google Patents
Stability calculation method for slope soft soil foundation filling project Download PDFInfo
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- CN111241702A CN111241702A CN202010061756.2A CN202010061756A CN111241702A CN 111241702 A CN111241702 A CN 111241702A CN 202010061756 A CN202010061756 A CN 202010061756A CN 111241702 A CN111241702 A CN 111241702A
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Abstract
The invention discloses a stability calculation method for slope soft soil foundation filling engineering, which comprises the steps of ① obtaining filling body stability calculation parameters, ② obtaining soft soil foundation stability calculation parameters, ② 3 obtaining reinforced soft soil foundation stability calculation parameters, ② 1 obtaining partition stability calculation parameters of soft soil foundations of the downhill sides of filling bodies which are not reinforced, ⑤ searching reinforced soft soil foundations and worst arc sliding surfaces of the filling bodies, ⑥ searching reinforced soft soil foundation and filling body combined sliding surfaces which comprise arc sliding surfaces, bedrock broken line sliding surfaces and deformation disturbance soft soil arc sliding surfaces, ⑦ performing stability calculation on the worst arc sliding surfaces by adopting the parameters obtained in the steps ② 0 to ④, ② 4 performing stability calculation on the combined sliding surfaces by adopting the parameters obtained in the steps ① to ④, ② 2 selecting the minimum stability and comparing with the standard safety factor, not meeting the requirements, adjusting foundation reinforcement measures or setting intervals of encryption reinforcement measures, and repeating the steps ③ to ⑧ until the requirements are met.
Description
Technical Field
The invention relates to the field of geotechnical engineering, in particular to a stability calculation method for slope soft soil foundation filling engineering.
Background
Slope soft soil foundation is in mountain area and hilly area wide distribution, build the fill engineering on slope soft soil foundation, the deformation of slope soft soil foundation is different from horizontal soft soil foundation, as shown in figure 1, soft soil foundation 2 horizontal deformation in the side of below the obturator 4 is big, the intensity parameter of foundation soil can constantly deteriorate under big deformation condition, when soft soil foundation 2 was located basement rock 1 upper portion, soft soil foundation 2's reinforcement measure 3 can not get into basement rock 1 lower part usually, the stability calculation to obturator 4 on soft soil foundation 2 this moment is different from horizontal foundation operating mode. At present, the stability calculation is usually carried out on the soil foundation and the filling body 4 by adopting an arc sliding surface or the arc sliding surface and combining a broken line sliding surface, but the parameter values of all the sections of sliding surfaces are directly related to the calculation accuracy, and a large number of slope soft soil foundation filling engineering instability cases appear in engineering practice, which indicates that the research on the slope soft soil foundation 2 is insufficient and the parameter values are unreasonable at present, so that the method for reasonably calculating the stability of the slope bedrock overlying soft soil foundation filling engineering has important significance.
Disclosure of Invention
The invention aims to: aiming at the problems in the prior art, the stability calculation method for the slope soft soil foundation filling project is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a stability calculation method for slope soft soil foundation filling engineering comprises the following steps:
①, acquiring parameter values required by stability calculation of the filling body;
②, obtaining parameter values required by the soft soil foundation stability calculation;
③, obtaining parameter values required by the soft soil foundation stability calculation after reinforcement;
④, acquiring parameter values required by the partition stability calculation of the soft soil foundation which is not reinforced on the downhill side of the filling body;
⑤, searching the most unfavorable arc sliding surface of the soft soil foundation and the filling body after consolidation;
⑥, searching a combined sliding surface of the reinforced soft soil foundation and the reinforced filling body, wherein the combined sliding surface comprises an arc sliding surface, a bedrock broken line sliding surface and a deformation disturbance soft soil arc sliding surface;
⑦, performing stability calculation on the most unfavorable arc sliding surface searched in the step ⑤ by adopting the parameter values obtained in the steps ① to ④;
⑧, performing stability calculation on the combined sliding surface searched in the step ⑥ by adopting the parameter values obtained in the steps ① to ④;
⑨, selecting the minimum stability safety factor obtained in the step ⑦ and the step ⑧, comparing the minimum stability safety factor with the safety factor required by the specification, if the minimum stability safety factor does not meet the requirement, adjusting foundation reinforcement measures or encrypting the setting intervals of the reinforcement measures, and repeating the steps ③ to ⑧ until the requirement is met.
Wherein the search for the sliding surface is performed by means of a conventional technique in the art.
By adopting the stability calculation method for the slope soft soil foundation filling project, the stability calculation method not only considers the traditional circular arc sliding surface calculation method, but also considers the circular arc sliding surface, the bedrock broken line sliding surface and the deformation disturbance soft soil circular arc sliding surface calculation method; the calculation method of the arc sliding surface, the bedrock broken line sliding surface and the deformation disturbance soft soil arc sliding surface fully considers the influence of the soft soil foundation and the bedrock contact surface and the influence of the deformation of the soft soil foundation on the deterioration of strength parameters on the lower side of the filling body, the calculation result is more in line with the actual condition, and the calculated safety coefficient is more accurate.
Preferably, in the step ①, the parameter value required for the stability calculation of the filler is determined empirically or through experiments.
Preferably, in step ②, a parameter value required by the soft soil foundation stability calculation is determined through an experiment.
Preferably, in step ③, a parameter value required for calculating the stability of the soft soil foundation after reinforcement is calculated according to an empirical formula.
Preferably, in the step ④, the parameter values required for the partition stability calculation of the soft soil foundation which is not reinforced on the downhill side of the filler are determined empirically or through experiments.
Preferably, in the step ④, the soft soil parameters of the soft soil foundation that is not consolidated are reduced on the basis of the step ②.
Preferably, in the step ⑧, the calculation parameter of the bedrock broken line sliding surface is obtained according to the result of the step ②.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the stability calculation method for the slope soft soil foundation filling project, the stability calculation method considers not only a traditional circular arc sliding surface calculation method but also the circular arc sliding surface, the bedrock broken line sliding surface and the deformation disturbance soft soil circular arc sliding surface calculation method; the calculation method of the arc sliding surface, the bedrock broken line sliding surface and the deformation disturbance soft soil arc sliding surface fully considers the influence of the soft soil foundation and the bedrock contact surface and the influence of the deformation of the soft soil foundation on the deterioration of strength parameters on the lower side of the filling body, the calculation result is more in line with the actual condition, and the calculated safety coefficient is more accurate.
Drawings
FIG. 1 is a schematic cross-sectional view of a filling project of a soft soil foundation on a slope in the prior art;
fig. 2 is a schematic cross-sectional view of the slope soft soil foundation filling project.
Icon: 1-bedrock, 2-soft soil foundation, 3-reinforcement measure and 4-filling body.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in fig. 2, the method for calculating the stability of the slope soft soil foundation filling project, provided by the invention, comprises the following steps:
①, determining parameter values required by stability calculation of the filling body 4 according to experience or through experiments;
②, determining parameter values required by the stability calculation of the soft soil foundation 2 through tests;
③, calculating parameter values required by the stability calculation of the soft soil foundation 2 after reinforcement according to an empirical formula;
④, determining parameter values required by the partition stability calculation of the soft soil foundation 2 which is not reinforced on the downhill side of the filling body 4 according to experience or tests, wherein the soft soil parameters of the soft soil foundation 2 which is not reinforced are reduced on the basis of the step ②;
⑤, searching the most unfavorable arc sliding surface of the soft soil foundation 2 and the filling body 4 after consolidation;
⑥, searching and reinforcing combined sliding surfaces of the soft soil foundation 2 and the filler 4 after reinforcement, wherein the combined sliding surfaces comprise an arc sliding surface, a broken line sliding surface of a bed rock 1 and a deformation disturbance soft soil arc sliding surface, the arc sliding surfaces comprise a filler arc sliding surface of an AB section in fig. 2 and a soft soil reinforcement arc sliding surface of a BC section in fig. 2, the AB section and the BC section are located on the same circumference, the broken line sliding surface of the bed rock 1 is a CD section in fig. 2, the BC section is smoothly connected with the CD section, the deformation disturbance soft soil arc sliding surface comprises a DE section and an EF section in fig. 2, the CD section is smoothly connected with the DE section, and the DE section and the EF section are located on the same circumference;
⑦, performing stability calculation on the most unfavorable arc sliding surface searched in the step ⑤ by adopting the parameter values obtained in the steps ① to ④;
⑧, performing stability calculation on the combined sliding surface searched in the step ⑥ by adopting the parameter values obtained in the steps from ① to ④, wherein the calculation parameters of the bedrock 1 broken line sliding surface are valued according to the result of the step ②;
⑨, selecting the minimum stability safety factor obtained in the step ⑦ and the step ⑧, comparing the minimum stability safety factor with the safety factor required by the specification, if the minimum stability safety factor does not meet the requirement, adjusting foundation reinforcement measures 3 or encrypting the setting distance of the reinforcement measures 3, and repeating the steps ③ to ⑧ until the requirement is met.
By applying the stability calculation method of the slope soft soil foundation filling project, the stability calculation method considers not only the traditional circular arc sliding surface calculation method but also the circular arc sliding surface, the bedrock 1 broken line sliding surface and the deformation disturbance soft soil circular arc sliding surface calculation method; the calculation method of the arc sliding surface, the broken line sliding surface of the bedrock 1 and the deformation disturbance soft soil arc sliding surface fully considers the influence of the soft soil foundation 2 and the contact surface of the bedrock 1 and the influence of the deformation of the soft soil foundation 2 on the deterioration of the strength parameters on the lower side of the filling body 4, the calculation result is more in line with the actual situation, and the calculated safety coefficient is more accurate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A stability calculation method for slope soft soil foundation filling engineering is characterized by comprising the following steps:
①, acquiring parameter values required by stability calculation of the filling body (4);
②, obtaining parameter values required by the stability calculation of the soft soil foundation (2);
③, obtaining parameter values required by the stability calculation of the soft soil foundation (2) after reinforcement;
④, acquiring parameter values required by the partition stability calculation of the soft soil foundation (2) which is not reinforced on the downhill side of the filling body (4);
⑤, searching the most unfavorable arc sliding surface of the soft soil foundation (2) and the filling body (4) after reinforcement;
⑥, searching a combined sliding surface of the reinforced soft soil foundation (2) and the filler (4), wherein the combined sliding surface comprises an arc sliding surface, a bedrock (1) broken line sliding surface and a deformation disturbance soft soil arc sliding surface;
⑦, performing stability calculation on the most unfavorable arc sliding surface searched in the step ⑤ by adopting the parameter values obtained in the steps ① to ④;
⑧, performing stability calculation on the combined sliding surface searched in the step ⑥ by adopting the parameter values obtained in the steps ① to ④;
⑨, selecting the minimum stability safety factor obtained in the step ⑦ and the step ⑧, comparing the minimum stability safety factor with the safety factor required by the specification, if the minimum stability safety factor does not meet the requirement, adjusting the foundation reinforcement measure (3) or encrypting the setting distance of the reinforcement measure (3), and repeating the steps ③ to ⑧ until the requirement is met.
2. The calculation method according to claim 1, wherein in step ①, the values of the parameters required for the stability calculation of the filling body (4) are determined empirically or by experiment.
3. The method of claim 1, wherein in step ②, parameters required for calculating the stability of the soft soil foundation (2) are determined through tests.
4. The method according to claim 1, wherein in step ③, the parameter values required for calculating the stability of the soft soil foundation (2) after reinforcement are calculated according to an empirical formula.
5. The calculation method according to claim 1, wherein in the step ④, the parameter values required for the zonal stability calculation of the soft soil foundation (2) which is not reinforced by the filling body (4) on the downhill side are determined empirically or through experiments.
6. The method of claim 1, wherein in said step ④, the soft soil parameters of said soft soil foundation (2) not consolidated are reduced based on said step ②.
7. The calculation method according to any one of claims 1 to 6, wherein in the step ⑧, the calculation parameters of the broken line sliding surface of the bedrock (1) are obtained according to the result of the step ②.
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