某潜在不稳定斜坡稳定性分析与治理研究

以某潜在不稳定斜坡为例,在地质勘查资料的基础上,通过对其地质概况、特征以及成因机理的分析,采用定性与定量相结合的方法对其稳定性进行计算和稳定性分析、评价,得出该潜在不稳定斜坡处于基本稳定~欠稳定状态,经过技术、经济比选,采用挡土墙加地表排水系加土钉支护系统进行治理。     

浅谈四川省江油市大康镇旱丰村7社张家垭不稳定斜坡勘探及防治建议

江油市大康镇旱丰村7社张家垭不稳定斜坡位于江油市大康镇旱丰村7社张家垭,涉及不稳定斜坡1处,位于山前斜坡地带。不稳定斜坡体受5.12汶川特大地震的影响,不稳定斜坡体变形较强烈,裂缝明显。现状稳定性较差,在暴雨和余震的诱发下,易产生新的变形,不稳定斜坡体直接危害到7社居民3户,人口12人,对当地群众的正常生活生产和社会安定构成威胁,制约当地经济发展。     

烟台长岛县某不稳定斜坡勘查与治理对策研究

通过对烟台市长岛县某不稳定斜坡的稳定性进行勘查及评价,提出相应的治理对策,实现改善地质环境和促进生态文明建设的目的,并为类似地质环境治理提供经验模式,为行政主管部门实施地质环境治理、防灾减灾提供依据。     

浙江省诸暨市农村山区不稳定斜坡危险性分析

浙江省诸暨市农村山区曾发生大量的地质灾害,同时造成了巨大的经济损失,为了确保农村人口的安全和减少经济损失,通过对全市不稳定斜坡调查和统计,基本查明诸暨市不稳定斜坡的分布与发育特征,进行不稳定斜坡危险程度分析和危险程度评价。建立应急体系,提出防治措施建议,为政府组织开展群测群防、监测预警、避让搬迁、勘查治理和村镇规划,最大限度地避免和减少损失。     

茂县二里山不稳定斜坡的破坏模式分析与治理设计

笔者通过实地考察5．12地震后茂县的山体受损情况,重点研究了位于茂县水若村的二里山不稳定斜坡,该斜坡出现较强烈的变形现象,严重危及下方村民的安全。本文阐述了二里山不稳定斜坡的岩体结构特征及破坏模式,并在此基础上提出相应的治理措施,为茂县灾后重建提供参考。     

无限斜坡稳定性分析安全系数的统一形式

从两类特殊渗流条件下的孔隙水压力入手,应用有效应力原理和Lagrange插值方法建立了无限斜坡稳定性分析安全系数的统一形式,从而形成了完整的无限斜坡稳定性分析方法。通过工程实例对所建立的统一形式进行了验证。该文提出的在渗流影响下无限斜坡稳定性分析对类似滑坡分析有一定的借鉴作用。尤其对于复杂渗流条件下的流场研究程度较高的重要道路工程地段及桥涵附近边坡稳定性分析。坝基抗滑稳定性分析与验算等问题的研究具有实践指导意义。     

区域滑坡评估中斜坡单元剖面线提取方法及实现

传统水文过程提取的斜坡单元存在坡度突变问题,且单元计算剖面的提取基于ARCGIS等软件二次开发完成,效率较低,不能适于大区域滑坡评估要求。本文提出一种满足区域滑坡评估假定的斜坡单元提取方法,新的斜坡单元具有均一的坡度等地形特征,具有较高推广应用价值。针对新的斜坡单元,提出相应的单元剖面线提取方法,并利用FORTRAN语言,编制了剖面线自动提取程序SLU-PROFILE。云南蒋家沟流域提取结果表明,本文提出的方法能够正确提取斜坡单元剖面线。程序具有鲁棒性强、高效的特点,对于不同的研究区域,只需更改主程序中两个变量数值(斜坡单元数目和边界点数目)即可在数十秒内自动输出剖面线端点坐标文件,能够适用于大区域滑坡稳定性评估预报。     

煤矿井巷工程地质预报与不稳定岩体的施工措施

井巷工程地质是研究井巷、铜室、采场所在岩体的工程地质条件,分析和评价岩体的稳定性,为采掘工程设计与施工提供有价值的工程地质资料,协助采掘部门拟定不稳定岩体的施工方案,避免由于工程地质条件不清而导致的事故,以实现良好的工程效果和经济效益。本文主要阐述了煤矿井巷工程地质的任务、井巷工程地质预报、不稳定岩体的施工措施等技术问题。     

强度折减拉格朗日差分法分析土坡稳定性

本文采用强度折减弹塑性拉格朗日差分方法分析土坡稳定性问题,通过与传统极平衡法分析结果对比研究,对抗剪强度折减拉格朗日差分方法分析土坡稳定问题的适用性进行了评价,并得出上坡发生滑裂破坏前夕上体内应变状态的分布规律。     

极射赤平投影在工程建设用地地质灾害评估中的应用

赤平投影是一种作图的投影方法,利用赤平投影来表示岩体中的坡面和结构面等,可以在投影图中较为简捷地确定它们的夹角和组合关系,从而达到岩质斜坡稳定性判定的目的。本文从赤平投影的原理、稳定性分析方法和工程实例来说明赤平投影在工程建设用地地质灾害评估中的应用。     

土质边坡的加固治理

在工程的建设过程中会遇到各种各样的场地边坡稳定治理问题,在山区的工程建设中更是常见。如果场地不稳定,主体工程建得再好也是白费;只有场地的稳定尤其是边坡的稳定治理好了,才不会影响主体建筑的使用。地质情况非常复杂,根据不同的地质情况采取相应的治理措施,因地制宜,才会将边坡的稳定治理好,做到一劳永逸。     

井工开采对露天煤矿边坡稳定性影响的数值模拟研究

鉴于国内露天矿转井工开采的实际情况,对于采动坡地稳定分析较少。结合了阜新高海煤矿的实际情况,利用有限差分软件FLAC-3D软件,建立了海州露天矿边坡的三维模型,对采动影响下的边坡的稳定性进行三维数值模拟研究,获得了露天矿边坡变形破坏的基本特点及稳定性的基本状况。模拟的结果对采动边坡的位移和受力状态进行分析,为采动边坡稳定性分析提供了参考：     

Design of optimal PID controller for multivariable time-varying delay discrete-time systems using non-monotonic Lyapunov-Krasovskii approach

This paper is concerned with stability analysis and stabilization of time-varying delay discrete-time systems in Lyapunov-Krasovskii stability analysis framework. In this regard, a less conservative approach is introduced based on non-monotonic Lyapunov-Krasovskii (NMLK) technique. The proposed method derives time-varying delay dependent stability conditions based on Lyapunov-Krasovskii functional (LKF), which are in the form of linear matrix inequalities (LMI). Also, a PID controller designing algorithm is extracted based on obtained NMLK stability condition. The stability of the closed loop system is guaranteed using the designed controller. Another property that is important along with the stability, is the optimality of the controller. Thus, an optimal PID designing technique is introduced in this article. The proposed method can be used to design optimal PID controller for unstable multi-input multi-output time-varying delay discrete-time systems. The proposed stability and stabilization conditions are less conservative due to the use of non-monotonic decreasing technique. The novelty of the paper comes from the consideration of non-monotonic approach for stability analysis of time-varying delay discrete-time systems and using obtained stability conditions for designing PID controller. Numerical examples and simulations are given to evaluate the theoretical results and illustrate its effectiveness compared to the existing methods.     

An analysis of stability of neutral-type neural systems with constant time delays

This paper investigates the stability problem of a class of neutral-type neural networks with constant time delays. By constructing a proper Lyapunov functional, a novel sufficient condition for the global stability of the equilibrium point for the class of neutral-type neural systems is presented. The obtained stability condition is expressed in terms of the system parameters of the network, and therefore, it can be easily verified. We also give a comparative numerical example to show the applicability of the result and demonstrate its advantages over the previously published corresponding stability results.     

杭金衢公路K103滑坡成灾机制及综合治理

大型复杂滑坡是山区公路边坡开挖颇为棘手的防护对象。杭金衢高速公路K103滑坡是一个典型的潜伏型岩质滑坡,体积约1.60×106m3,其成灾机制较为复杂,受公路运营条件限制,工程治理颇为棘手。通过GIS与钻孔分析,并结合定量评价,确定滑坡蠕动状态,为大型复杂滑坡制定了综合治理对策,颇值得工程借鉴。     

广西某矿山滑坡群特征及稳定性评价

从地层岩性、地质构造、水文条件等方面,阐述该滑坡群的基本特征和形成机制;通过传递系数法和Janbu法、Bishop法的滑坡稳定性计算对比分析,结果表明:天然状态下,2号滑坡及4号滑坡目前整体稳定系数处于1.05～1.15之间,处于基本稳定状态,(雨季)整体安全系数处于1.00～1.05之间,处于欠稳定状态,3号滑坡、5号滑坡产生滑动后,目前处于暂时稳定,在旱季可保持基本稳定,在暴雨状态时3号滑坡、5号滑坡主断面的安全系数均小于1.05,处于不稳定状态。最后,提出为提高滑坡稳定性应采取的工程加固措施,具有较高的实践和理论意义。     

Exponential stability of switched genetic regulatory networks with both stable and unstable subsystems

This paper concerns the stability analysis problem for stochastic delayed switched genetic regulatory networks (GRNs) with both stable and unstable subsystems. By employing the piecewise Lyapunov functional method combined with the average dwell time approach, we show that if the average dwell time is chosen sufficiently large and the derivative of the Lyapunov-like function for unstable subsystems is bounded by certain kind of continuous function, then exponential stability criteria of a desired degree are guaranteed. The derived results show that the minimal average dwell time is proportional to the time delays. Finally, an example is given to illustrate the effectiveness of the derived results.     

New gain-scheduling control conditions for time-varying delayed LPV systems

This paper investigates the problem of stability and state-feedback control design for linear parameter-varying systems with time-varying delays. The uncertain parameters are assumed to belong to a polytope with bounded known variation rates. The new conditions are based on the Lyapunov theory and are expressed through Linear Matrix Inequalities. An alternative parameter-dependent Lyapunov-Krasovskii functional is employed and its time-derivative is handled using recent integral inequalities for quadratic functions proposed in the literature. As main results, a novel sufficient stability condition for delay-dependent systems as well as a new sufficient condition to design gain-scheduled state-feedback controllers are stated. In the new proposed methodology, the Lyapunov matrices and the system matrices are put separated making it suitable for supporting in a new way the design of the stabilization controller. An example, based on a model of a real-world problem, is provided to illustrate the effectiveness of the proposed method.     

Multi-sensor Kalman filtering over packet-dropping networks subject to Round-Robin protocol scheduling

This paper considers the filtering problem for a class of linear cyber-physical systems (CPSs) subject to the Round-Robin protocol (RRP) scheduling, where the RRP is adopted to efficiently avoid data collisions in multi-sensor application scenarios. Unlike most of the existing results concerning the scheduling effects of the RRP under reliable communication channels, the filtering problem over packet-dropping networks is investigated. In such a framework, an optimal Kalman-type recursive filter is derived in the minimum mean square error (MMSE) sense, which is different from the suboptimal filters with bounded error covariances proposed in the previous results. Due to the protocol-induced behaviors and the unreliability of the channels, the estimator may be unstable. Thus, the stability problem of the filter is mainly discussed. It can be proved that the filter is stable when the arrival rate of the measurements exceeds a certain threshold, where the threshold can be obtained by solving a quasi-convex optimization problem. Furthermore, a sufficient condition for the existence of the steady-state error covariance is presented and can be transferred into the feasibility of a certain linear matrix inequality (LMI). Finally, a simulation example is provided to demonstrate the developed results.     

Stabilization of highly nonlinear hybrid systems driven by Lévy noise and delay feedback control based on discrete-time state observations

There are many hybrid stochastic differential equations (SDEs) in the real-world that don’t satisfy the linear growth condition (namely, SDEs are highly nonlinear), but they have highly nonlinear characteristics. Based on some existing results, the main difficulties here are to deal with those equations if they are driven by Lévy noise and delay terms, then to investigate their stability in this case. The present paper aims to show how to stabilize a given unstable nonlinear hybrid SDEs with Lévy noise by designing delay feedback controls in the both drift and diffusion parts of the given SDEs. The controllers are based on discrete-time state observations which are more realistic and make the cost less in practice. By using the Lyapunov functional method under a set of appropriate assumptions, stability results of the controlled hybrid SDEs are discussed in the sense of pth moment asymptotic stability and exponential stability. As an application, an illustrative example is provided to show the feasibility of our theorem. The results obtained in this paper can be considered as an extension of some conclusions in the stabilization theory.