美国GCTS Testing Systems
美国GCTS公司是设计和生产实验室和现场的土工、岩石测试仪器和软件的专业厂家，还可以对原有系统进行数字化升级和计算机数字伺服控制，并提供咨询和服务。GCTS生产全套的计算机数字伺服控制系统包括：电液式动三轴测试系统，动态空心圆柱测试系统，共振柱扭剪测试系统，直剪测试系统，动态单剪测试系统，非饱和土动静三轴测试系统，Fredlund SWCC土水特征曲线压力仪，Fredlund热传导吸力探头，冻土动三轴测试系统，室内水压力制裂测试系统，岩石三轴测试系统，快速岩石三轴测试系统，岩石单轴压缩测试系统，岩石直剪测试系统，UTMUTM沥青混合料疲试验机系统等。

Geotechnical Consulting and Testing Systems provides selection and design of laboratory and in-situ testing apparatus and software ranging from modification and adaptation of existing apparatus to the purchase of new closed-loop computer-controlled systems. The company manufactures a full line of computer-controlled testing systems with either pneumatic or hydraulic loaders. Each system comes with a versatile software package which provides test control, data acquisition, data reduction, and graphing in one easy to learn Graphical User Interface. Testing capabilities include static and dynamic loading of soil, rock, and other construction materials. Static tests include drained and undrained triaxial shear, using conventional loading or arbitrary stress paths, direct shear, consolidation, permeability, and other procedures. Advanced testing capabilities include hollow cylinder, simple shear, and poly-axial systems with optional upgrades for testing unsaturated soils. Dynamic tests include liquefaction, modulus, damping, resilient modulus, and ultrasonic velocity measurements. Other laboratory tests are also possible through the use of a general purpose multiple function generator and data acquisition that allows the user to design his/her own test procedures. Software and hardware for several in-situ tests can also be provided. In addition, the company offers consultation on test result analysis and test data interpretation.

The primary service of the company is testing system design and integration. The testing experience and background of the staff enable us to ensure that a testing system not only works at its final destination but can also be made to generate meaningful data. Among GCTS personnel and consultants are specialized engineers and technicians with a vast experience in instrumentation, electronics, mechanics, manufacturing and other testing equipment related fields. The company has a fully equipped machine shop. Outside shops are also used. Off the shelf and machine-shops-fabricated components are integrated in house and tested before shipment