This paper discussed about the changes of stress state on effect of soil properties . the reason of surface settlement and layer losses is that the stress state is not primeval one in and after tunneling construction . therefore it is necessary to select strength data in actual stress path in making tunnel deformation and stability analysis with continuous media mechanics 本文讨论了隧道施工过程中,由于应力状态的变化对土性的影响, ,隧道施工之所以造成地表沉降和地层损失,是因为隧道施工过程中以及隧道施工结束后土层的应力状态已经不是原始应力状态,因此在选用连续介质力学方法对隧道施工进行变形和稳定性分析时,必须采用实际应力路径下强度参数。
This thesis analyzes the tcp friendly issues in continuous media data transmission and studies different methods to ensure the tcp friendliness in data transmission . a series of performance evaluations have been conducted to evaluate the tcp friendliness of flow control algorithms in continuous media transmission by using ns2 ( network simulator 2 ) from u . c . berkeley 本文在加州大学伯克莱分校的ns2网络模拟平台上对流媒体数据传输中流量控制算法的tcp友好性进行性能评价,分析了流量控制算法中存在的tcp友好性问题,提出了新的流量控制算法即tfrc ? ivs流量控制算法。
By introducing damage tensor and net stress , this study has analyzed the mechanical properties of rock mass structural plane , hi this way , the rock mass question is macroscopically transformed into one of continuous medium mechanics , hi the light of the engineering reality in chengchao iron mine , the damage tensor of the area under research has been obtained on the basis of engineering geological survey 通过引入损伤张量和净应力来分析岩体结构面的力学特性,从宏观上将岩体纳入连续介质力学的范畴来处理。结合程潮铁矿实际,在工程地质调查的基础上,求得研究区域的损伤张量。
Using the numerical computation method to simulate the pure air flowing in the plasma generator and using zero dimension theory and continuous medium hypothesis to establish the mathematical model of the plasma generator and applying the curvilinear coordinate to disperse the space of the plasma generator , applying simplec method to solve the set of discredited equations 应用数值计算的方法模拟了等离子发生器内部的纯空气流动,应用零维理论分析模型和连续介质假设建立了描述等离子发生器内部流动和传热的数学模型;采用贴体坐标系对等离子发生器的流场空间进行空间离散;采用simplec算法来求解离散方程,获得流场的数值解。
Although various mechanics models have put forward many numerical techniques , the widely used one that is commonly admitted by engineers is the finite element method . combined the joint elements , on some extent this method could overcome structural surface obstacles described by the mechanics of continuous media such as the joint of canny existing in the inner of rocks . until now , the finite element method has been widely employed because of the mature of the large - scale construction computing software 针对各种力学模型提出了多种数值方法,最广泛使用的并获得了工程界普遍承认的是有限元法,有限元法结合节理单元可以一定程度上克服连续介质力学在描述岩体内部存在节理裂隙等结构面的障碍,目前有限元法由于大规模结构计算软件的成熟而为工程界所普遍运用。