上海市中环线虹许路北虹路下立交工程是目前世界上在饱和含水软土地层中施工的截面最大的管幕法工程。为保证在管幕内顶进大断面箱涵（前端嵌固钢板制网格框架）的施工过程中开挖面的稳定性，在网格横截面尺寸一定的情况下，设计合理的网格长度就十分重要。在考虑箱涵上部管幕允许沉降变形的基础上，根据作用于网格内壁土压力的分布模式，并兼顾考虑实际操作的可行性，给出了网格长度的较为合理的设计计算方法。最后，对于本实际工程，详细计算出了较为合理的网格长度，较好地满足了各主要控制因素。

The influence of strain history on rock specimen deformation during multi-level loading and unloading cyclic uniaxial compression creep tests is studied with a creep testing machine. An experimental data processing method for such creep tests is suggested. The correction formulas to determine the rheological model parameters are derived for the case when load relaxation is considered. Creep and relaxation tests under uniaxial compression on four types of rocks are conducted using an electronic hydraulic servo-controlled stiff testing machine. The creep and relaxation laws of the different rocks are compared. The complete stress

This paper presents a study for quantifying both the joint topography characteristics and the load-closure deformation of a rock joint under normal compressive loading condition. The study covers (1) laboratory measurements of rock joint surface profiles using a profilometer designed and fabricated by the research team, (2) development of a mathematical method to identify the waviness and unevenness components in joint surface profiles and the associated composite topography, (3) development of a general load–closure deformation model by using both the waviness and unevenness components in the composite topography, (4) unconfined compressive testing of rock samples with joints for the experimental load-closure deformation of joints and, (5) verification of the general load-closure deformation model by the experimental load-closure deformation results. The study leads to the following four findings: (a) the mathematical method can be used to identify the waviness and unevenness components for joint surface profiles and its composite topography. The height characteristic parameters of the complete surface topography of a joint are mainly determined by the waviness component. The texture characteristic parameters of the complete surface topography of a joint are mainly determined by the unevenness component, (b) joints can be classified into the three contact state cases using the waviness and unevenness components for both the joint surface profiles and the associated composite topography. The load-closure deformation behavior of a joint is determined by the waviness and unevenness components of the composite topography for a specific contact state, (c) the general load–closure deformation model developed in this paper is applicable to the three contact state cases. The general load-closure deformation model uses the composite topography of a joint and can take into account the effects of the contact states, the initial aperture and the waviness and unevenness components; (d) parametric studies and verifications with the uniaxial compression test results show that the general load-closure deformation model gives reasonable estimations of the load-closure deformation behavior of rock joint under compressive loading and can be reduced to those given by other researchers in the relevant literature.

用C语言在MS2DOS运行环境下开发了INSTRON材料试验机计算机辅助测试（CAT）系统。该系统除可使用INSTRON控制柜原有的传感器外，还可使用各种外接传感器。可通过程序设置采样通道的输入电压量程，使之与各种不同输出电压量程的仪器相匹配。用汉化菜单调用各种功能模块和显示信息，人机界面好，成本低、使用方便。

本文介绍RSP-I型室内测试岩石表面形貌仪。其驱动、测试、数据的记录及处理均由微机实现，且具有较高的精度。同时，介绍了相应的计算机辅助测试（CAT）软件，给出了一些节理表面的形貌测试结果。