四川省喇叭沟滑坡稳定性分析及治理研究

发布时间：2018-03-26 01:49

  本文选题：滑坡稳定性　切入点：影响因子　出处：《吉林大学》2017年硕士论文

【摘要】：本论文所涉及的喇叭沟滑坡,位于四川省西南部的会理县江普乡智力村,凉山彝族自治州正南端,处于攀西资源开发区腹心,西连攀枝花,南与云南省昆明市和楚雄州相邻,介于东经102°14'17.02"~102°14'39.88",北纬26°13'51.83"~26°14'11.48"之间,属四川省凉山州所辖,滑坡总面积约为15.8×104m2。本论文以四川省喇叭沟滑坡为背景,从地形地貌、地层岩性、地质构造与地震、气象水文地质条件及人类工程活动这五方面着手,结合野外地质调查与工程勘察,对该滑坡的工程地质条件进行了细致的研究,结合滑坡的机理及专家打分,筛选出相对较为重要的影响因子,再运用MATLAB软件计算出各个影响因子的权重值,结合数学知识,得出各个影响因子的综合权重值,其中修建灌渠房屋所占的综合权重为0.1304,降雨为0.2667,地震为0.1911,从而拟定了天然工况、持续降雨工况、地震工况这三种工况。运用理正和FLAC软件研究滑坡稳定性时,根据拟定的天然工况、持续降雨工况以及地震工况这三种工况,分别计算分析滑坡在这三种不同工况下的稳定性系数。分析滑坡的整体稳定性时,由于滑坡的滑面呈折线形,因此采用的方法是传递系数法,滑坡的整体是趋于稳定的,仅有三处斜坡处于欠稳定或不稳定的状态,坡体变形至今雨季还在持续,未来雨季有继续发展的趋势,可能导致滑坡失稳。在计算的过程中,选择合理的物理力学参数,进行FLAC数值模拟,并与理正分析得出的结果进行对比,以确保计算分析的可靠性。Ⅰ号斜坡在天然工况下的稳定性系数为1.046,处于欠稳定状态;持续降雨工况下的稳定性系数为0.999,处于不稳定状态;地震工况下的稳定性系数为1.024,处于欠稳定状态;Ⅱ号斜坡在天然、持续降雨、地震这三种工况下的稳定系数和稳定性分别为1.051(基本稳定)、1.003(欠稳定)、1.026(欠稳定);Ⅲ号斜坡在天然、持续降雨、地震这三种工况下的稳定系数和稳定性分别为1.055(基本稳定)、1.005(欠稳定)、1.029(欠稳定);与FLAC数值模拟的结果很接近,理正运用的是瑞典条分法求解安全系数,该方法基于应力一应变分析的近似解,而FLAC运用的是强度折减法,该方法是基于条块间的力的假设的解析解,两者相吻合。在数值模拟的辅助下,可以很直观地看到斜坡的潜在滑移面。根据滑坡稳定性分析的结果及地形等条件研究滑坡治理,有针对性地进行治理,选择仰斜式重力挡土墙作为支护结构,并验算治理之后的稳定性。在滑坡的前缘设置挡土墙,以达到防治滑坡进一步发展的目的。经验算,所设计的挡土墙满足抗滑移及抗倾覆稳定性要求。修建灌渠占的权重值比较大,建议要用挡土墙进行滑坡防治的同时,还应配合合理修建房屋及灌渠进行综合治理。
[Abstract]:The Xiagou landslide in this paper is located at the southern end of Liangshan Yi Autonomous Prefecture, Jiangpu Township, Huili County, southwest Sichuan Province, and is located in the heart of Panxi Resource Development Zone, with Panzhihua in the west, adjacent to Kunming and Chuxiong in the south of Yunnan Province. Between longitude 102 掳14 and 17.02 "102 掳14" 39.88 "N 26 掳1313 51.83" 26 掳1411.48 ", belonging to Liangshan Prefecture, Sichuan Province, the total area of landslide is about 15.8 脳 10 ~ 4 m ~ 2. The background of this paper is Xiagou landslide in Sichuan Province, which is based on landform and geomorphology, stratigraphic lithology, geological structure and earthquake. From the five aspects of meteorological, hydrogeological conditions and human engineering activities, combined with field geological investigation and engineering investigation, the engineering geological conditions of the landslide are studied in detail, and the landslide mechanism and experts are graded. Select the relatively important influence factors, then use MATLAB software to calculate the weight value of each influence factor, combined with mathematical knowledge, get the comprehensive weight value of each influence factor. The comprehensive weight of building irrigation canal is 0.1304, the rainfall is 0.2667, and the earthquake is 0.1911. As a result, the three conditions of natural condition, continuous rainfall condition and earthquake condition are drawn up. When using the software of Lizheng and FLAC to study the stability of landslide, According to the three working conditions of natural condition, continuous rainfall condition and earthquake condition, the stability coefficient of landslide under these three different conditions is calculated and analyzed separately. When the overall stability of landslide is analyzed, the slide surface of the landslide is folded linearly. Therefore, the method adopted is transfer coefficient method. The whole landslide tends to be stable. Only three slopes are in an unstable or unstable state. The deformation of slope body is still in the rainy season, and the future rainy season will continue to develop. In the course of calculation, choose reasonable physical and mechanical parameters, carry out FLAC numerical simulation, and compare with the results obtained by positive analysis. In order to ensure the reliability of calculation and analysis, the stability coefficient of No. 1 slope is 1.046 under natural conditions and 0.999 under the condition of continuous rainfall. The stability coefficient and stability of slope 鈪，

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