【作者】 陈秀琼；

【导师】 白志勇；

【作者基本信息】 西南交通大学 ， 地质工程， 2007， 硕士

【摘要】 我国是一个多山的国家，山区面积约占国土面积的三分之二，特别是西南地区，山区面积超过70％。在多山地区，各种地质灾害的发育制约和影响着西部山区的社会经济发展，并威胁着人民的生命财产安全。特别是崩塌灾害，严重威胁着联结西部地区与外界沟通的交通枢纽。随着西部开发的深入实施，社会经济的高速发展，越来越多的运营任务要承担，迫切需要对沿线各种地质灾害进行评估和治理，以增大线路的运营能力。论文以内昆铁路K249+159段的崩塌为研究对象，在野外调查、收集整理前人资料的基础上，通过分析灾害点形成的工程地质条件和影响灾害形成发生的因素，对该崩塌体的成因做了系统分析：同时经过室内计算和数值模拟，对崩塌体的稳定性和应力应变场作了一定研究。同时在以上对崩塌体认识的基础上，提出了本崩塌灾害防治技术方案。通过对内昆铁路K249+159段崩塌的系统研究，论文主要取得了以下成果：1)根据现场调查和室内岩土性质试验，确定崩塌体的破坏为错断式崩塌破坏。2)恢复了原边坡形态，并通过计算证明原边坡是不稳定的。3)计算出原崩塌体运动的末速度为30.53m／s，在公路上的弹跳距离为1.71米，计算出山坡上最小拦截高度为1.53米。4)分析并计算了原崩塌体对公路和铁路的危害性和安全影响范围，计算了崩塌体对铁路明洞形成的最大冲击力。5)采用FLAC3D软件模拟分析了崩塌体的应力应变场，模拟结果与野外实际情况基本一致。6)验证了在内昆线K249+159点铁路上方的312国道的边坡崩塌治理方案中，布鲁克网防护的可行性。7)指出了工点既有铁路的半堤半堑路基形式不能抵抗崩塌体的冲击，需将路堑改为明洞和棚洞。同时提高其抗冲击能力设计。更多还原

【Abstract】 Mountainous area occupy 2/3 of the total area in China, which makes is a montanic country, especially in the southwest mountainous area occupy 70%.In these area, plenty of geological hazards restrict the montane economical development and intimidate the security of the community in Southwest. With the development of the west exploitation, more transportation cries for the evaluation and renovation along the arteries.This article concentrate on the rock fall along the K249+159 section of the railway from Neijiang to Kunming, and by analyzing the geological engineering condition and hazardous genesic factors on the basic of outdoor investigation and former data, formative systems analysis of the rock fall is implemented, and the numerical calculation and simulation is utilized to analyze the stability and strain stress field. At last, renovation method is brought forward on the basis of cognitions above.This article makes the following conclusion through the systems analysis of the rock fall along the K249+159 section of the railway from Neijiang to Kunming:1) The destroy mode of rockfall is offset according to field investigation and geotechnical tests in laboratory.2) Restore the original shape of the slope, and proved the slope is not stable by calculating.3) Got the final speed of falling-rock is 30.53m/s, and its bounce distance in the highway is 1.71m.4) Analysis on the harm to the road and railway and affect range, and the maximum impact force to the railway open tunnels.5)Simulated and analyzed the stress and strain fields of rockfalls by FLAC3D. The simulation is identical to the reality.6) Verified the feasibility of Brucker protective net on rockfall treatment of Route 312 above k249+159, Nei-Kun railway.7) The cutting railway and the intensity can not resist the impact of rockfalls, the cut slope need to change to open tunnel and shed tunnel to improve itsimpact-resistance.更多还原