| Currently, with flourishing development of economic construction in our country, the reinforcement of unstable slope is involved in the water conservancy, highway, civil engineering fitting and other industries. High-pressure jet grouting pile with characteristics of short construction period, low cost, no environmental pollution etc, has been widely used in engineering practice of reinforcing slope. However, there were few studies on stability calculation of slope reinforced by high-pressure jet grouting pile. In the article, combined with the management of channel slope of Changzhou Hydro-junction, we carried out the following researches:(1)Introduced some common calculation methods for slope stability in detail, and performed contrastive analysis to them; studied the similarities and differences in calculation methods on slope stability according to existing norms; explored calculation methods for slope stability under reinforcement by high-pressure jet grouting pile.(2)Taking channel slope of Changzhou Hydro-junction for example, with Lizheng rock calculation software, built computational model of complex soil before and after reinforcement of slope, analyzed the effect of high-pressure grouting pile on reinforcing slope and studied the influence of calculation methods, engineering situation as well as pile length on calculation results of slope stability. The calculation results show that reinforcing the slope with high-pressure jet grouting pile is effective;calculation methods,engineering situation make great affect on the results of stability caculation of slope and extended the pile length can increase the stability of the slope coefficient. With Lizheng deep foundation software, built the model of cement-soil gravity retaining wall after slope reinforcement, analyzed the effect of high-pressure jet grouting pile on reinforcing slope and conducted comparison with the results of computational model of complex soil. The calculation results show that according the model of cement-soil gravity retaining wall checking the stability of reinforcement slope,the whole stability of the slope (resisting slippage,resisting capsizing) safety coefficient can meet the design requirements; the bearing capacity of foundation and the strength of reinforcement both meet the checking requirements;according the model of cement-soil gravity retaining wall checking the stability of reinforcement slope is non-conservative.(3)Aiming at the disadvantage of failing to considerate pile separation at length direction in choosing calculation method for the section when conducted stability calculation of slope reinforced by high-pressure jet grouting pile in the current engineering practice, proposed that according to the principle of equivalent displacement rate of area, with pile equivalent to continuous cement-soil walls at long direction along slope, then chose methods of calculating section. Combining with the approach channel slope of Changzhou Hydro-junction, using the calculation methods for section based on engineering practice(method A) and considered by author respectively(method B), studied the relationship between the separate indicators of pile-soil shearing strength and the composite indicator of pile-soil shearing strength. The calculation results show that based on method A, when the caculation results of slope reinforcement area used the composite indicator of pile-soil shearing strength calculated on the replacement rate of area equal to the caculation results of slope reinforcement area used the separate indicators of pile-soil shearing strength the composite indicator of pile-soil shearing strength need to increase by a multiples,the increase multiples is not constant; based on method B, the caculation results of slope reinforcement area used the composite indicator of pile-soil shearing strength calculated on the replacement rate of area and the separate indicators of pile-soil shearing strength is equal; the stability coefficient of the slope processing with high-pressure jet grouting pile calculated based on method A is too large, suggestion calculating the stability of the reinforced slope based on B method. |
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