金安桥水电站初次蓄水对导流洞稳定性影响的计算分析

金安桥水电站下闸蓄水后，陡升的库水位将对导流洞结构稳定造成不利影响。为保障堵头封堵前的导流洞结构稳定性，运用三维弹塑性损伤有限元，在模拟进水口边坡及导流洞开挖支护的基础上，计算汛前下闸水位时的岩体渗流场，对导流洞围岩和衬砌在岩体渗流作用下的结构稳定性进行复核分析。分析结果表明，导流洞的围岩稳定性在蓄水后仍有保障，衬砌结构受力较小，现有环向配筋满足结构内力要求，但在进水口变截面和导流洞变截面部位沿水流方向的拉应力较大，使得衬砌出现开裂。进一步分析表明，上述区域的开裂范围有限，对整体衬砌结构影响较小。     

The Influences of Surrounding Rock Deformation in Deep Roadway under Different Supporting Structures

随着煤矿开采深度的不断增加，围岩变形特征更加复杂。基于ANSYS数值模拟软件，研究4种不同支护条件下深部巷道围岩的变形情况，研究结果表明：30MPa原岩应力作用下，联合支护产生的水平位移和垂直位移都要比其他支护小，变形影响区域也最小，最为适合围岩地质条件较差的巷道。     

直墙拱形巷道围岩应力场分析

为得出直墙拱形巷道围岩应力分布规律,应用复变函数弹性理论推导了直墙拱形巷道围岩应力分布的解析表达式。对直墙拱形巷道边界的围岩应力和巷道水平线方向的围岩应力分布规律进行分析,并考虑直墙拱形巷道断面高宽比和侧压系数对其影响规律。研究表明：在不同巷道断面高宽比、侧压系数下,直墙拱形巷道围岩应力集中区域主要集中在直墙底部底角处、拱形顶板中点附近和底板中部3个位置。不同巷道断面高宽比下,直墙拱形巷道沿水平线的应力分布规律基本相同。侧压系数大于1时,采用巷道断面高宽比小于1较有利于巷道稳定;侧压系数小于等于1时,采用巷道断面高宽比大于1较有利于巷道稳定。     

Study on Mechanism of the Reinforcing Effect of Geogrid in Soil Dam

An experimental study on consolidation and drainage of two gravels with different grading was carried out using high - pressure large - scale tri - axial testing facility. A concept of equivalent surrounding pressure is introduced. An analysis was carried out on the effect and mechanism of reinforcement, experimental surrounding pressure and soil properties. Results show that the reinforcement can improve the strength and failure strain of the material and delay the failure of the soil. The effect of reinforcement of soil - gravel depends on the surrounding pressure and weathering of the gravel.     

贴边钢岔管与围岩联合承载有限元分析

以某水利水电枢纽工程为例，分别对明岔管和有初始缝隙的埋藏式钢岔管两种结构方案，进行了三维有限元计算分析，讨论了围岩性能及初始缝隙值对钢岔管应力和围岩承载比的影响，并与明岔管计算结果相比较，得出了一些有意义的结论。     

雾灵山自然保护区资源保护措施对周边社区的影响

保护区大多处于周边社区的包围之中，保护区与当地居民关系密切。但是保护区的建立使部分生物资源受到控制，从而对当地社区的社会经济造成了影响。从几个方面对其进行了分析，并对社区共管提出了一些建议。     

ANALYTICAL SOLUTION OF RING SHELL LINING WITH ANNULARLY VERTICAL WALLS MADE CONTACT WITH SURROUNDING ROCK

In this paper,the ring shell lining with annularly verticalwalls made contact with the surrounding rock is considered as a combinationstructure formed of ring shell,inner and outer annular barrels on elastic fo-undation.The complex equation and its solutions of ring shell under deadload of lining and vertical and horizontal surrounding rock pressures are de-rived by the method of complex function.The governing equation and itssolution of the barrels on elastic foundation are also derived by theory ofcylindrical shell.And then,the ring shell lining is assembled by the subst-ructures by means of compatibility conditions of internal forces and defor-mations between them.In the paper,all formulas for the practical computa-tion in engineering are derived,the numerical examples are given and theeffects of the parameters of the lining on the work behaviours of lining alsoare discussed preliminarily     

Numerical Analysis on Stability of Rock in Sijiaotian Tunnel

The Sijiaotian Tunnel in Yunnan Dabao Highway lies in the narrow defile landscape,and the engineering geology condition is complex,with plenty of cienega.According to the actual situation of the Sijiaotian Tunnel Project in Yunnan Dabao Highway,the stability of the surrounding rock mass is studied by using a 3-D non-linear FEM.The Drucker-Prager criterion is chosen as the failure criterion of the rock.The relatively dangerous zone and the monitoring points in the tunnel are determined.The numerical results show that the Sijiaotian Tunnel is relatively stable.The conclusion has some significance for guiding the construction of similar projects.     

Stability analysis on shallow tunnel with floor lift under inclined ground by upper bound method

采用极限分析上限法,基于内外能耗守恒原理,通过构建考虑隧底隆起的斜坡地段浅埋隧道破坏模式,推导出围岩压力的计算式,并通过典型算例重点分析了典型因素对隧道围岩稳定性的影响。研究结果表明：基于泰沙基极限平衡法进行隧道围岩支护设计较为保守,不考虑隧底隆起的极限分析方法次之考虑隧底隆起极限分析方法的风险最大;斜坡地表倾角增大对浅埋隧道稳定性有着不可忽视的不利影响;围岩压力随岩土侧压力系数减小、埋深增大、断面尺寸加大而增大;岩土黏聚力增大、内摩擦角增大对提高浅埋隧道围岩稳定性有积极作用。