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美國GCTS Testing Systems
美國GCTS公司是設計和生產實驗室和現場的土工、巖石測試儀器和軟件的專業廠家，還可以對原有系統進行數字化升級和計算機數字伺服控制，并提供咨詢和服務。GCTS生產全套的計算機數字伺服控制系統包括：電液式動三軸測試系統，動態空心圓柱測試系統，共振柱扭剪測試系統，直剪測試系統，動態單剪測試系統，非飽和土動靜三軸測試系統，Fredlund SWCC土水特征曲線壓力儀，Fredlund熱傳導吸力探頭，凍土動三軸測試系統，室內水壓力制裂測試系統，巖石三軸測試系統，快速巖石三軸測試系統，巖石單軸壓縮測試系統，巖石直剪測試系統，UTMUTM瀝青混合料疲試驗機系統等。

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