摘要:The mechanism and control method of complex landslide of steep cut slope with brady-inclined joints in high-grade highway are discussed briefly. The presented technology and method can be used for reference in similar highway of scenic spot.%简述某不具倾倒滑坡的大型缓斜陡节理边坡, 在上部薄表土滑动促使下的倾倒复合破坏机制与应急治理对策。 可供同类风景区的公路建设与损害治理参考。
摘要:借助相似材料模拟试验的研究方法, 讨论了华亭矿区白草峪井田煤5特厚煤层的放顶煤问题。 试验认为: 分3层放顶煤的开采方法是可行的, 分2层放顶煤的方法是不可行的; 分3层放顶煤时回收率能够达到要求, 而分2层时回收率较低。 同时也得出放顶煤的最佳分层厚度为12~15m, 最佳采放比为1∶3。 以上结论为白草峪井田的开采设计提供了重要依据。%With the help of the research methods of similarity model tests, the problems about top coal caving of specially thick coal seam of coal No.5 of Baicaoyu well field in Huating mine administration is discussed. Three similar material model tests show that the top coal caving mining with three layers is reasonable, but the top coal caving mining with two layers is not reasonable. The coal-recycling ratio with three layers can meet engineering requirement, but the coal-recycling ratio with two layers is very low. The optimal layer-divided thickness is 12~15m and the optimal ratio of mining to caving is 1∶3.
摘要:基于滑移型裂纹模型, 研究了花岗岩在应变速率为10-4~100s-1的单轴抗压强度与应变速率的关系。 结果表明, 花岗岩的抗压强度随应变速率的增加而增加, 模型结果与实验结果吻合较好。 在动荷载作用下, 裂纹的扩展速率和岩石断裂韧度的率相关特性, 导致岩石的动态抗压强度随应变速率的增加而增加。%The study of dynamic uniaxial compressive strength of granite at strain rate from 10-4 to 100s-1 is conducted using sliding crack model. It is shown that the theoretical strengths increase with increasing strain rate and agree well with the experimental results. It is suggested that crack growth velocity and the rate dependence of fracture toughness of rock material result in the strength increment with increasing strain rate.
摘要:The settlements of surface and each layers over a double-line pipe jacking rectangle tunnel in Pudong New District in Shanghai are studied. By means of tracking surveying, the distribution of surface settlement dish is obtained. The grouting volume is calculated and the loss rate of the stratum is analyzed.%就上海浦东某双线矩形顶管隧道施工中的地表沉降和土层沉降进行跟踪测量, 得到地表沉降槽的分布情况, 在计算注浆量后, 分析了该工程的地层损失率。
摘要:利用积分方程和递推矩阵-刚度矩阵方法求解了考虑层状两相介质固结和流变的水平受荷的单桩问题。 首先利用层状两相介质中水平圆形载荷基本解, 建立了时域内的层状两相介质地基中水平单桩的积分方程。 然后对所得的积分方程进行Laplace变换, 得到变换域内的积分方程, 对变换域内的积分方程采用Schapery逆变换方法得到时域内水平单桩的近似积分方程。 最后对所得的积分方程进行数值求解得到桩的剪力、 弯矩和位移。%By using integral equation and ‘propagator matrix and rigid matrix’ methods, the horizontally loaded single pile in layered saturated soil is solved considering consolidation and rheology of layered soil. In order to solve the proposed problem, the fundamental solutions of horizontal circular load in the interior of the layered half space are used. The second kind of Fredholm integral equation of the single pile in layered saturated viscoelastic soil is obtained through the fundamental solutions. The integral equation can be simplified by means of Laplace transforms methods. By the corresponding inverse Laplace integral transforms method and the numerical solution of the integral equation, the displacement, shear force and moment of the pile are obtained.
摘要:The influences of cavity growth in underground coal gasification on gasification process are analyzed on the basis of introduction of underground coal gasification. The development of space expanding laws and control methods in underground coal gasification are reviewed. The problems and ideas to be studied deeply are put forward combining with the gasification characteristics of China.%在介绍煤炭地下气化特点的基础上,对地下气化空间扩展及气化过程影响进行了分析,综述了国内外在煤炭地下气化空间扩展规律及控制方法的研究进展,结合中国的气化工艺特点,提出了需进一步研究的课题。
摘要:根据岩体三轴卸荷试验, 研究了卸荷岩体的各向异性特性, 如岩体卸荷的应力-应变关系、 抗拉强度和变形模量等, 得到几点有意义的结论。%Based on the results of unloading test of rock mass under tri-axial stress state, the mechanical properties of unloaded rock mass is studied. The relationship between stress and strain, tensile strength and deformation modulus are analyzed. Some conclusions are obtained.
摘要:应用弹塑性理论分析了矿山压力对急倾斜煤层顶煤破碎的作用, 认为在低瓦斯急倾斜煤层中只有当顶煤在支承压力的作用下进入应力极限平衡状态时, 顶煤才可放出, 据此计算顶煤可能的分段高度。 但分段高度的确定还需考虑煤层厚度变化的影响, 将煤层厚度视为一个随机变量, 并根据可放度确定合理的分段高度。%The effect of rock pressure on the crack of top coal of steep seam is analyzed by elastic-plastic theory. .It is put forward that the top coal of low gaseous steep seam can be caved only when the top coal is in the limiting equilibrium state of stress under the abutment pressure. The sublevel height of top coal is calculated. However, the change of seam thickness has to be thought over when the sublevel height of top coal is determined. Therefore the seam thickness is considered as a random variable, and the reasonable sublevel height of top coal is determined by the reliability.
摘要:综合利用两种及两种以上的地基处理方法可形成多元复合地基, 提出了其承载力计算及检测方法。%When two or more techniques of ground treatment are comprehensively applied, the multi-element composite foundation may be formed. The computation and testing methods for the bearing capacity of multi-element composite foundation are put forward.
摘要:Taking the karst foundation problem with 10km long tunnel in Tianshengqiao No.2 Hydropower Station for an example, the geology condition, engineering geology problem and treatment method of the karst foundation are presented.%以天生桥二级水电站近10km长的深埋隧洞中遇到的岩溶地基问题为例, 概括性地介绍几类典型岩溶地基的地质概况、 存在的工程地质问题及其地基处理方法。
摘要:对膨胀土路基边坡进行封面处理, 是保证边坡稳定工作的常用工程措施之一。 由于封面土与膨胀土路堤间的界面成为整个路堤的薄弱环节, 由此会导致封面土本身产生稳定性丧失问题, 需要对封面土层进行稳定性计算分析。 对于等厚式封面土层, 目前常用的分析方法均是根据无限长平行坡的假设来进行的, 但实际路基边坡是有限长的, 这种方法所假定的滑动面与实际不符。 按笔者通过实验所得的滑动面位置, 对膨胀土路基边坡等厚式封面土层的稳定性计算公式进行了推导, 确定了稳定性系数的分析计算公式。%Putting veneer cover soil on the slope of expansive soil subgrade is a method to prevent the failure of expansive soil subgrade. But the interface between the veneer cover soil and the subgrade becomes a new weak-point to whole subgrade. This leads to another stability problem of veneer cover soil itself. To analyse the stability of veneer cover soil of equal-thickness, the most commonly used methods are based on the assumption that slopes are infinite in length. But the practical slopes of subgrade are finite in length. Through laboratory testing study, it is found that the actual sliding surface occurs in veneer cover soil on finite slope, which is different from the results commonly used methods mentioned above. According to the actual sliding surface from laboratory testing study, a new formula is developed to determine the stability factor of veneer cover soil on the slope of expansive soil subgrade.