Mathematics statistic model of the main observation variables and horizontal displacement hybrid model of typical monolith of huangtankou concrete gravity dam are established . through model analysis and parameter inversion , taking into account of water level and temperature , deformation monitoring control index of typical monolith is determined by the improved method of probability . the primary contents are as follows : 1 建立了黄坛口混凝土重力坝主要观测量的数理统计模型和典型坝段水平位移混合模型等，通过对各数学模型的分析和参数反演，综合考虑水位温度采用改进小概率法拟定了典型坝段水平位移的监控指标，得到一些有益的结论，其主要内容如下： 1
Concrete gravity dam , which has many advantages including security , simplicity of design and construction , better applicability to terrain and geology condition and can easily solve difficulties caused by construction diversion and permanent flood discharge , is a dam type predominantly used in practical engineering presently . however , the designing principles used to control construction quantity and reliability of the gravity dam was mainly based on experiences 混凝土重力坝主要具有安全可靠、设计施工技术简单、对地形和地质条件的适应性较好、施工导流和永久性泻洪问题容易解决的优点，是目前在工程中采用较多的一种坝型，但是控制重力坝工程量和安全度的设计原则基本上仍然依赖于经验。
Based on several actual cases , the temperature control measures for roller compacted concrete ( rcc ) gravity dam and arch dam such as structural jointing for construction ; lowering of concrete placing temperature ; water pipe cooling ; surface insulation ; inclined - layer placing etc . , the measures to improve the material properties i . e . the application of micro - expanding concrete ; enhancement of material crack - resistance property and the requirement for the simulative analysis on both the temperature field and stress field as well as some problems concerned are summarized herein on the basis of the analysis on the material properties ; construction characteristics and the changing characteristics of the thermal stress of roller compacted concrete 摘要从碾压混凝土的材料特性、施工特点、温度场温度应力的变化特点入手，结合几个工程总结了碾压混凝土重力坝、拱坝的分缝方式，降低浇筑温度、水管冷却、表面保温、施斜层碾压等温控措施，采用微膨胀混凝土、提高材料抗裂性能等改善材料性能措施及碾压混凝土温度场、应力场仿真分析的要求和应注意的问题。
About thermal stress and temperature control of rcc dam in harsh climate region , this paper emphasizes mainly on the following aspects : 1 . research on space - time distribution rules of the temperature and thermal creep stress of rcc gravity dam in harsh climate region ; analyzing the reason of formation and influencing factors of the horizontal cracks at the dam upstream and downstream face 围绕严寒地区碾压混凝土坝的温度应力和温控防裂，本文主要进行了以下几方面研究： ( 1 )结合两座碾压混凝土坝工程实例，研究了严寒地区碾压混凝土重力坝温度及温度徐变应力时空分布规律，分析了大坝上下游面水平裂缝的成因、影响裂缝的主要因素。
Concentrated on the questions of temperature control and crack prevention studies on high rcc gravity dams , simulative calculation theories of temperature and stress fields of high rcc gravity dams are systematically studied in theory and practice , the temperature control of longtan high rcc gravity dam is analyzed and studied in detail 本文围绕高碾压混凝土重力坝的温控防裂问题，从理论和实践上系统地研究了高碾压混凝土重力坝温度场和徐变应力场的仿真计算理论，并对龙滩高碾压混凝土重力坝的温控问题进行了详细的分析和研究。
On the basis of investigations into the progressive yield process and the possible failure modes of rcc gravity dams , the quasi - elasticity design limit state of the ctrtical stability criterion is proposed and the real working state of the dams designed according to the ctriterion is discussed . a check formula using the material strength reducing factor as the safety index and a simplified formula similar to against sliding stability fromula are derived . finally , the corresponding design safety factors are given by using fem calculations with various influence parameters to be taken into account 本文在研究碾压混凝土重力坝渐进破坏过程和可能失稳方式的基础上，提出了以准弹性临界作为稳定临界准则的设计极限状态，分析了按该准则设计的大坝的实际工作状态，导出了以准弹性强度储备系数为设计安全指标的审查公式以及形式与抗剪断公式相同的简化公式，探讨了定量计算考虑各种因素影响的相应设计安全系数的合理取值，并与现行规范方法进行了比较
Till now , yunfeng concrete gravity dam has served for more than 30 years . according to some regulation , it is necessary to evaluate its security . based on its service condition , geology situation and load property , it is essential to make further analysis , so that more practical results can be got 云峰混凝土重力坝至今已运行三十余年，根据有关规定，需对大坝进行安全检查，根据大坝运行情况、地质情况和受力情况，有必要对大坝进行更深入细致的分析，得出更切合实际的结论。
In harsh climate region , mere exists obvious local stress concentration near the upstream and downstream of the exposed - in - winter horizontal surface of the rcc dam , and the surface of spillway bucket though heat insulation is applied on the surfaces , tensile stress still exceeds the allowable one of concrete . this paper puts forward to adopt preset crack to avoid occurring more cracks . the special crack model is applied to simulate the dam preset crack , and the joint model of fracture mechanics is induced into strain - soften model 在结构措施方面，针对严寒地区高碾压混凝土重力坝坝体越冬层面的上、下游面附近及溢流坝堰面反弧段表面有明显的局部应力集中象现，在已采取一定的表面保温防护的条件下，拉应力仍然超过混凝土容许拉应力，开裂难以避免，进而提出设置碾压混凝土坝表面预留缝结构措施并对该措施进行深入研究，包括预留缝的扩展稳定和坝体沿预留缝的稳定性，以避免大坝在无措施部位开裂，解决大坝越冬层面水平施工缝的开裂问题。
