【作者】 吴圣林；

【导师】 王桂梁；

【作者基本信息】 中国矿业大学 ， 矿产普查与勘探， 2008， 博士

【摘要】 论文系统研究了一种新型复合滑坡类型“崩塌-推覆滑移地质体”的成因机理、评价参数、稳定性、勘探方法、防治原则和防治监测方法等,完善了滑坡方面的研究理论,填补了对防灾减灾更具指导意义的复杂滑坡体的研究领域,对今后同种以及其它相似类型的地质体的研究和治理提供了理论参考依据和思路方法。论文研究表明,单斜的地层结构和不对称的山间溶蚀冲沟及沟底和两侧特有的地貌是形成崩塌-推覆滑移地质体的必要条件。崩塌-推覆滑移地质体经历了崩塌→滑移并滑移稳定→再崩塌→推覆滑移并滑移稳定…多期次的周而复始的过程,是崩塌堆积体和推覆滑移地质体多期次复合的巨型滑坡体。崩塌是推覆滑移地质体滑移变形的主要动力因素,而崩塌堆积的块石层又是斜坡稳定的关键控制层位。当斜坡临空面地层为推覆滑移软弱地层时,易产生牵引式的表层滑动。崩塌-推覆滑移地质体地质模型可概化为由崩塌堆积的块石层和推覆滑移软弱地层二元结构多期次复合而构成。论文采用现场原位水平推剪试验测定研究了复杂结构组成岩土体的抗剪强度参数c、φ值,并经原型计算剖面验证。论文采用极限平衡法和数值分析法对崩塌-推覆滑移地质体斜坡稳定性进行了研究,在当前条件下斜坡整体是稳定的。三维数值模拟结果显示:块石层的分布对斜坡的变形、应力分布和稳定性起着关键的控制作用。工程建设和地面堆载不影响崩塌-推覆滑移地质体斜坡的整体稳定,但工程建设、挖方填土等人为活动可能诱发地质体局部滑移破坏。论文从“以灾害体作为建筑材料的一个组成部分来治理灾害体,利用灾害体的不良地质过程来控制与改造它的不良地质过程”的防治工程基本理论出发,提出崩塌-推覆滑移地质体斜坡稳定防治须遵循主要原则,提出了斜坡稳定性监测的最关键内容。研究场地已有监测结果表明,斜坡场地整体是稳定的,2008年5月12日的汶川8.0级地震没有对斜坡整体稳定构成影响。更多还原

【Abstract】 The paper systematically studied of a new type complex landslide—"Toppling-thrusting nappe-sliding geolodical body", about its formation mechanism, calculating parameters, stability, sliding stabiliazing principias, inspection monitoring methods and so on. The research achievements consummated and complemented the theory about landslide, and reinforced the complex landslide researching with more helpful for disaster prevention and mitigation, and also provided a reference of theoretical gist and research approach in researching and treating with the same and other similar geological body.It is indicated through the researching that the necessary conditions of the formation of "toppling-thrusting nappe-sliding geological body" included monoclinal strata texture and anisomerous intermontane gully and the peculiarly physiognomy in the bottom and side of the gully. The toppling-thrusting nappe-sliding geological body formed through a circularly process such as that "toppling, toppling bodies sliding and stopping, toppling again, toppling bodies thrusting the soft bed strata sliding and stopping,…,"and so on. It is a huge landslide repetitious complexed with toppling accumulations and thrusting nappe-sliding geological bodies. Toppling was the main dynamical factors of the displacement and deformation of thrusting nappe-sliding geological body, while the toppling rock strata were the key strata in the stabilization of the slope. When the free face strata were the soft bed strata, the surface retrogressive sliding came into being easily.The geological model of toppling-thrusting nappe-sliding geological body can be approximately made up of two elements which were toppling rock accumulations and thrusting nappe-sliding soft geological bodies. The geological model of toppling-thrusting nappe-sliding geological body can be approximately made up of two elements which were toppling rock accumulations and thrusting nappe-sliding soft geological bodies.The shear strength parameters c,φof geological body with complicated structure and different complex composing has been studied by the in-situ level-push shear test, and been validated from the prototype sliding medol.The methods of limit equilibrium and numerical analysis have been adopted to study the stability of toppling-thrusting nappe-sliding geological body. Evaluation results indicated that the whole slope is stable under the current conditions. Three-dimensional numerical simulation results showed that the distribution of rock strata plays a crucial control role in the deformation, stress distribution and stability of the langslide slope. Project constructing and building and stacking could not affect the whole stability of toppling-thrusting nappe-sliding geological body, but excavating and leveling up and filling and other human activities may bring part sliding into being.From the basic theory of disaster prevention and treatment that " taking as an integral part of architecture material to father the body of disasters, using the adverse geological process to control and transform its adverse geological processes", this paper puts forward the main principias to comply with in controlling the stability of toppling-thrusting nappe-sliding geological body, and the most critical contents in monitoring. The inspection monitored results show that the studied slope is overall steady, and the May. 12, 2008 Wenchuan(Sichuan) Mw8.0 earthquake did not affect the overall stability of the studied Geological body.This paper included 53 figures, 18 tables, 13 photos and 179 references.更多还原