| China-Myanmar gas pipeline is one of the major pipeline projects in the"Eleventh Five-Year Plan",with the same period of the proposed China-Burma oil and gas pipeline together constitute our strategic channel imports southwest.Oil and gas pipelines in Baoshan City,Yunnan Longling Longshan Village Dapingzi Xinxiang and Longxin Village Huangcao Pa Xintangfang was built at the junction of the China-Burma gas plumber Longling sub-transmission compressor stations with the China-Burma oil plumbers Longling pumping station(referred to as "Longling station").Due to backfilling,soil excavation,long ling station forms a series of high slopes,the height of some slopes is more than 40m,and is located in rainy areas and earthquake zone,so slope works great particularity.This text will be based on high slope engineering of Long Ling Station that the geographical environment of the slop,slope which is not shored after excavation can be conducted stability evaluation by qualitative and quantitative methods while investigation and analysis of the engineering geological conditions of slope,and slope treatment measures can be studied.Combined with strength reduction,saturated-unsaturated seepage theory and pseudo-static method,the use of large-scale professional software FLAC3D geotechnical stability analysis rely on conventional engineering conditions and the special conditions,such as-rainfall and earthquake.The main contents are as follows:(1)To carry out on-site engineering geological survey work,it can get the basic characteristics of the long ling station slope.According to the engineering geological conditions of the site,slope which is not shored after excavation can be conducted stability evaluation.It can be evaluated from qualitative analysis and quantitative analysis,and it can use qualitative analysis by engineering analogy method,at the same time,it can also use quantitative analysis by the limit equilibrium method in rainfall,earthquakes and other four conditions of slope to conduct stability analysis.The slope stability that is based on a comprehensive analysis is determined after the excavation.(2)Based on Orthogonal analysis Univariate analyzes the degree of angle of internal friction,cohesion,the height of the water table,seismic intensity of four factors influence the slope stability.Through the orthogonal experiment table calculation results of range analysis,the sensitivity of the order of four factors can be obtained.(3)According to the results of slope stability calculation,prevention and treatment measures Longling high slope are studied,and according to the relevant regulatory requirements and the actual situation on the Slope Support program comparison,it is necessary to determine a reasonable prevention and treatment programs,and programs sub-design.(4)Taking into account the anchor and anchor rope and other support structures may fail after long service,so it can use the strength reduction analyses the relying on conventional conditions of stability and potential failure modes.The analysis can be couducted under the support from the only effective anti-slide pile,only stabilizing piles and cable support effective,only anti-slide pile and bolt support effective and efficient support structure of all four kinds of working conditions,and it can be judged according to the results of slope stability and potential failure modes.(5)For the realities of the rainy summer and earthquake zone in the relying on the project site,combined with strength reduction,unsaturated-unsaturated seepage theory and pseudo-static analysis rely on the special conditions of the stability of the slope engineering.Analys rainfall,earthquake special conditions,it can be judged according to the results of slope stability and potential failure modes. |
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