( 3 ) ensemble character of structural planes as follows : in left dam abutment , meta basalt schistosity is main , and the structure is clockwise . low dip angle jointing did n ' t develop in rock mass ; in right dam abutment , rupture and jointing structural plane is main , and the structure is reversed . the structure was of obvious macroscopical slaty character ( 3 )通过对上述结构面的分析，得出其总体特征为：左坝肩以变玄武岩片理为主体，呈顺向结构，岩体内缓倾角节理极不发育；右坝肩主要为断裂及节理型结构面，呈反向结构，且具有明显的宏观板状结构特征，并发育有一定厚度的构造软岩带。
( 5 ) rock mass stability analysis on dam abutment of xia luo - yu damsite as follows : in left dam abutment , sideslip control structure has been relatively integrate , and low dip angle jointing did n ' t develop , so integrate sliding deformation control structure could n ' t been formed in three - dimensional space and rock mass stability could n ' t been influenced badly ; in right dam abutment , indicate rock mass distortion was caused by the rock mass mechanics condition , such as specific rock mass structure , compression stress concentrate with high strength and especial landform and so on ( 5 )对下落鱼坝址坝肩岩体稳定问题的分析得出：左坝肩岩体虽然具有相对较完整的侧滑控制结构，但由于缓倾角节理不发育，故在三维空间上不能形成完整的滑移变形控制结构，亦不会对坝肩岩体稳定性产生严重影响：右坝肩岩体复杂变形，是在特定的岩体结构、高强度的压应力集中及特殊的地形等不可或缺的岩体力学条件下产生的。
On the basis of a large number of field geology investigation , the theory on engineering stratification was applied to analyze and study systemically rock mass structural surface of dam abutment , and further throw light on overall character of rock mass structure . by setting up definite structural level model and statistical model , and analyzing further numerical simulation of finite element , the action of rock mass stress and shape distortion has been recognized and apprehended in depth 本论文以现场地质调查为基础，应用系统工程层次性理论，对坝肩岩体结构面进行了系统的分析研究，阐明了坝肩岩体结构的总体特征，建立了坝肩岩体结构的确定性层次模型和统计模型，通过进一步的有限元数值模拟分析，深化对岩体应力形变作用的认识与理解。
( 2 ) statistical character and engineering control effect of short and intermittent structural plane ( iiia and iiib level ) of dam abutment has been systemically studied . and this kind of structural plane took important effect to appraise whether latent discrete boundary of massif could be formed and rock mass quality ( 2 )系统研究了坝肩短小、断续性结构面(分类中的_ a类和_ b )的统计特征及其工程控制效应，阐明了此类结构面对能否构成坝肩岩体块体的潜在分离边界以及对岩体质量的评价起着重要作用。
From the zonal map , the burying depth and area percentage of rock mass which belong to different grades in dam abutment and riverbed can be obtained respectively . so embedded depth can be determined preliminarily according to the requirement of high arch dam for foundation rock mass . then important data are provided for rational layout of hydraulic structures 大型水电工程往往积累有丰富的勘探资料，如何科学地管理这些资料并将其直观、准确地反映在工程地质图件上，即将岩体结构类型及岩体质量空间变化特征以图形展示，是当前研究的重点和难点之一。
Although joint spacing is an important index in rock mass structure classification , it ca n ' t be obtained in some regions such as riverbed , so the practicability of using those indexes which characterizing the integrity degree of rock mass to class the rock mass structure is studied , and good coincidence is shown in rock mass structure classification by joint spacing , integrity coefficient and number of joints in dam abutment 本文研究了用表征岩体完整程度的指标?完整性系数、 rqd及5m洞段节理条数j _ d (与体积节理数类似)划分岩体结构类型的可行性。对两岸坝肩部位，节理间距、完整性系数、 5m洞段节理条数这三项指标划分的岩体结构类型基本一致；河床坝基部位主要用rqd指标来判断岩体结构类型。
The first power station of jinping mountain lies in the west section of the yanglongjiang river from santan to shoupagou gully , with a double - curved arch dam of 305 - meter height and a normal water storage of 1880metres . the exposed strata of the damsite are marbles and arenaceous rocks of triassic and solution fissures have been developed in the marbles of the left - bank ' s dam abutment , and they have become a stratum of strong leakage . as a result , it has been an important problem for the dam foundation to stop leakage 锦屏一级电站位于西雅砻江的三滩至手爬沟河段，坝型为305米高双曲拱坝，正常蓄水位标高1880米。坝址区出露的地层为三叠系杂谷脑组二段大理岩和三叠系杂谷脑组三段的砂板岩。在勘探过程中，发现左岸坝肩大理岩体中的构造裂隙和溶蚀裂隙发育，且成为强渗透地层，为此坝基的防渗成为重要问题。
The research fruits in this article can provide the temperature isoline map of crown cantilever section and central longitudinal section of the dam , the stress isoline map of crown cantilever section and upstream and downstream surfaces of the dam , the maximal and minimal stress distribution map in dam abutment along with the height of dam , the maximal and minimal stress table of typical nodes and the maximal and minimal stress table in different elevations , and also provide reference basis for taking relative temperature control measures in the design and construction of rcc arch dam 本文研究成果可给出坝体的拱冠梁剖面和坝体中心纵剖面的温度等值线图、拱冠梁剖面和坝体上下游面应力等值线图、坝肩最大最小应力沿坝高的分布曲线、不同高程处典型点的最大最小应力值表以及不同高程处最大最小应力值表等成果，为碾压混凝土拱坝的设计和施工中采取相应的温控措施提供了参考依据。
At first , the basic theory and general process of the abutment stability against sliding of the arch dam with common definite solution ( the limiting equilibrium method of the rigid body and finite element method ) are simply developed . then combined with , reliability computation , the stochastic finite element method is used to establish the relationship between the load effect ( stress or force ) and basic stochastic variable dealing with statistical features of variables . based on the stochastic finite element method , the reliability of the arch dam abutment stability against sliding is analyzed , and the corresponding reliability index is calculated 首先简要介绍用传统定值方法(刚体极限平衡法和有限单元法)分析拱坝坝肩抗滑稳定的基本原理和一般过程，再与可靠度理论相结合，考虑变量的随机特性，通过随机有限元法建立荷载效应(如应力、内力等)与基本随机变量之间的关系，然后在随机有限元的基础上进行拱坝坝肩抗滑稳定的可靠度分析，计算相应的可靠指标。
Meanwhile , the influence of the distribution types , cut - tail and correlation of the stochastic variable on the reliability is discussed finally , the application of the arch dam abutment stability against sliding analysis with the way of common definite solution and stochastic finite element method is tested by one practical example analyzed and calculated in our province 并讨论了随机变量的分布类型、截尾情况以及相关关系对可靠指标的影响。最后对我省一实际工程进行计算和分析，验证传统定值分析方法及随机有限元方法在拱坝坝肩抗滑稳定分析中的应用。
