苗尾水电站导流隧洞进口边坡变形处理

苗尾水电站导流隧洞进口岩体质量较差,倾倒变形严重,洞口开挖后,边坡倾倒变形加剧,产生许多张拉裂缝。通过采取合理的加固处理方案,使变形得到了有效的控制,裂缝没有进一步发展,确保了工程及施工安全。这不仅为工程建设本身赢得了宝贵的工期,还为国内类似工程积累了设计经验。     

鸡口山溶洞隧道施工动态数值模拟分析

考虑到岩溶隧道的地质复杂性,有必要用多种手段对隧道施工进行综合超前地质预报,而数值模拟正是一种有效地途径之一。通过对鸡口山岩溶隧道特殊溶洞区域施工的动态超前数值模拟,为隧道采取合理的处治方式提供了参考依据。在模拟过程中,针对一处大型空溶洞区域进行隧道开挖和支护,并分析在施工过程中围岩变形、拱顶下沉和边墙收敛值等,给出最佳处理方案。     

薄壁类零件加工工艺的研究及应用

分析了一种典型薄壁零件加工变形的主要原因,通过对工件特性进行分析研究,制定了此类薄壁零件的加工工艺,设计制作装夹工装并进行了验证,减小了薄壁零件的加工变形,保证了零件精度加工质量,降低了加工成本。     

An examination of the mechanical interaction of drilling slurries at the soil-concrete contact

Evidence gained from previous field tests conducted on drilled shaft foundation shows that using drilling slurries to stabilize a borehole during the construction may influence the interfacial shear strength. This paper deals with an exhaustive study of the effects of drilling slurries at the contact between soil and concrete. This study involved adapting a simple shear apparatus and performing approximately 100 experimental tests on the interaction between two types of soils; clay and sandy clay and five specimens of concrete with different surface shapes. It also involved using bentonite and polymer slurries as an interface layer between soil and concrete. Results showed that an interface layer of bentonite slurry between clay and concrete decreases the interfacial shear strength by 23% and as an interface layer between sandy clay and concrete, bentonite increases interfacial shear strength by 10%. Using polymer slurry as an interface layer between clay and concrete decreases the interfacial shear strength by 17% while using it as an interface layer between sandy clay and concrete increases the interfacial shear strength by 10%. Fur- thermore, the data show that using bentonite and polymer slurry as an interface layer between clay and concrete decreases the sliding ratio by 50% to 60%, while increasing the sliding ratio by 44% to 56% when these are used as an interface layer between sandy clay and concrete.     

环境温度对某深基坑围护结构内力与变形影响分析

从热传导的基本方程出发,介绍结构瞬态温度场和应力场有限元一般格式.编制东京新丰州变电所围护结构二维温度场有限元分析程序,采用ANSYS工程分析软件,计算该围护结构在环境温度变化过程中引起的温度场、温度应力及温度变形,同时计算了在开挖土压力作用下该围护结构的内力与变形,将两种变形与实测变形值进行比较.结果显示,环境温度变化对类似工程围护结构的内力与变形有不可忽视的影响,必须加以计算.     

施工过程中混凝土徐变对结构竖向变形影响的有限元模拟

通过有限元模拟及算例验证,分析了高层建筑考虑施工过程中混凝土材料徐变对结构竖向变形的影响。分析表明,混凝土的徐变变形作用对柱的轴力影响不大,但对柱端弯矩影响较大;考虑徐变变形的柱端弯矩计算结果较没有考虑徐变变形的情况有显著减小。在考虑徐变影响的情况下,各层位移均有所增加,且两者的最大差值相差较大,很可能会影响结构的正常使用,在设计过程中不应忽视。该研究结果可为考虑高层建筑结构在施工过程中材料的徐变性能对结构内力的影响提供理论依据及分析方法。     

钢筋混凝土剪力墙结构抗震能力定量评价研究

以结构基本自振周期的变化率作为自变量,构造识别精度较高的对数函数,将其作为结构损伤的表征量,借助有限元分析设计软件ETABS对14层钢筋混凝土纯剪力墙结构进行数值模拟,揭示了地震波属性（峰值速度与加速度之比）、结构高宽比及等效损伤位置、损伤程度对整体结构抗震性能的影响规律,提出了适用于RC剪力墙结构剩余抗震能力的评价模型。     

Constitutive model of saturated soft clay with cyclic loads under unconsolidated undrained condition

An equivalent visco-elastic model of saturated soft clay was studied under unconsolidated undrained (UU) condition, which can be used to evaluate the stability of ocean foundation. Cyclic triaxial compression and extension tests were conducted to study the parameters of the model. Results showed that the relationships of the damping ratio and the octahedral shear modulus with the octahedral cyclic shear strain were nearly unique, when the initial octahedral shear stress ratios of specimens were equal to 0.3, 0.5 and 0.7. The relationships of the damping ratio and the octahedral shear modulus with the octahedral cyclic shear strain determined from the cyclic triaxial compression tests were basically the same as those determined from the cyclic triaxial extension tests. Furthermore, the relationships were not related to the initial stress condition, the test stress state and the octahedral cyclic shear stress ratio. The relationships determined from the cyclic triaxial tests under no deviatoric stress were basically the same as those determined from the cyclic triaxial tests under deviatoric stress. The change of the octahedral cyclic accumulative strain with the number of cycles was unique under different tests stress states. An equivalent visco-elastic constitutive model of saturated soft clay under UU condition was initially established.     

深部回采巷道底臌锚杆支护研究

针对鸡西东海煤矿采深1160m条件下,巷道产生底臌现象的实际情况,对32号层五采区四段回风平巷,应用底板锚杆支护进行研究。结果表明,在原有巷道支护的基础上加打底锚能够有效地控制底臌和巷道两帮的移近量,减少巷道围岩的变形量,保证巷道的稳定性,从而保证生产的正常进行。     

非连续变形分析方法在岩质边坡的块体动态稳定分析中的应用

基于块体系统非连续变形分析计算模型，结合工程实例分析岩质边坡块体的动态稳定性。计算表明，该模型基本符合实际，其结果可用于岩坡工程的设计和施工。